bare-metal: Add example for STM32F4DISCOVERY board

This commit adds a simple example for the ARM-based microcontroller
which blinking of the blue LED and can be built for different toolchains:

 * GCC
 * IAR EW
 * KEIL MDK

Change-Id: Icf9f1bb20356f5ccc532e895754ec0a7928ecdbc
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

15 files changed, 1526 insertions, 0 deletions

diff --git a/examples/baremetal/baremetal.qbs b/examples/baremetal/baremetal.qbs
new file mode 100644
index 000000000..f7b74925a
--- /dev/null
+++ b/examples/baremetal/baremetal.qbs
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import qbs
+
+Project {
+    name: "BareMetal"
+    references: [
+        "stm32f4discovery/stm32f4discovery.qbs"
+    ]
+}
diff --git a/examples/baremetal/stm32f4discovery/blueblink/README.md b/examples/baremetal/stm32f4discovery/blueblink/README.md
new file mode 100644
index 000000000..d15e12515
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/README.md
@@ -0,0 +1,10 @@
+This example demonstrates how to build a bare-metal application using
+different ARM toolchains. It is designed for the stm32f4discovery
+evaluation kit (based on stm32f407vg MCU) and simply flashes the blue
+LED on the board.
+
+The following toolchains are supported:
+
+  * GNU Arm Embedded Toolchain
+  * IAR Embedded Workbench
+  * KEIL Microcontroller Development Kit
diff --git a/examples/baremetal/stm32f4discovery/blueblink/blueblink.qbs b/examples/baremetal/stm32f4discovery/blueblink/blueblink.qbs
new file mode 100644
index 000000000..9b131fa71
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/blueblink.qbs
@@ -0,0 +1,165 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import qbs
+
+CppApplication {
+    condition: {
+        if (!qbs.architecture.contains("arm"))
+            return false;
+        return qbs.toolchain.contains("gcc")
+            || qbs.toolchain.contains("iar")
+            || qbs.toolchain.contains("keil")
+    }
+    name: "blueblink"
+    cpp.cLanguageVersion: "c99"
+    cpp.positionIndependentCode: false
+
+    //
+    // GCC-specific properties and sources.
+    //
+
+    Properties {
+        condition: qbs.toolchain.contains("gcc")
+        cpp.driverFlags: [
+            "-mcpu=cortex-m4",
+            "-mfloat-abi=hard",
+            "-mfpu=fpv4-sp-d16",
+            "-specs=nosys.specs"
+        ]
+    }
+
+    Group {
+        condition: qbs.toolchain.contains("gcc")
+        name: "GCC"
+        prefix: "gcc/"
+        Group {
+            name: "Startup"
+            fileTags: ["asm"]
+            files: ["startup.s"]
+        }
+        Group {
+            name: "Linker Script"
+            fileTags: ["linkerscript"]
+            files: ["flash.ld"]
+        }
+    }
+
+    //
+    // IAR-specific properties and sources.
+    //
+
+    Properties {
+        condition: qbs.toolchain.contains("iar")
+        cpp.driverFlags: [
+            "--cpu", "cortex-m4",
+            "--fpu", "vfpv4_sp"
+        ]
+    }
+
+    Group {
+        condition: qbs.toolchain.contains("iar")
+        name: "IAR"
+        prefix: "iar/"
+        Group {
+            name: "Startup"
+            fileTags: ["asm"]
+            files: ["startup.s"]
+        }
+        Group {
+            name: "Linker Script"
+            fileTags: ["linkerscript"]
+            files: ["flash.icf"]
+        }
+    }
+
+    //
+    // KEIL-specific properties and sources.
+    //
+
+    Properties {
+        condition: qbs.toolchain.contains("keil")
+        cpp.driverFlags: [
+            "--cpu", "cortex-m4.fp"
+        ]
+    }
+
+    Group {
+        condition: qbs.toolchain.contains("keil")
+        name: "KEIL"
+        prefix: "keil/"
+        Group {
+            name: "Startup"
+            fileTags: ["asm"]
+            files: ["startup.s"]
+        }
+        Group {
+            name: "Linker Script"
+            fileTags: ["linkerscript"]
+            files: ["flash.sct"]
+        }
+    }
+
+    //
+    // Common code.
+    //
+
+    Group {
+        name: "Gpio"
+        files: ["gpio.c", "gpio.h"]
+    }
+
+    Group {
+        name: "System"
+        files: ["system.h"]
+    }
+
+    files: ["main.c"]
+}
diff --git a/examples/baremetal/stm32f4discovery/blueblink/gcc/flash.ld b/examples/baremetal/stm32f4discovery/blueblink/gcc/flash.ld
new file mode 100644
index 000000000..2e1896f3f
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/gcc/flash.ld
@@ -0,0 +1,185 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/* Entry point (defined in assembled file). */
+ENTRY(reset_handler)
+
+/* End of RAM, it is the user mode stack pointer address. */
+_end_of_stack = 0x20020000;
+
+/* Generate a link error if heap and stack don't fit into RAM. */
+_size_of_heap = 0x200;  /* Required amount of heap. */
+_size_of_stack = 0x400; /* Required amount of stack. */
+
+MEMORY {
+    RAM (xrw)   : ORIGIN = 0x20000000, LENGTH = 128K
+    CCMRAM (rw) : ORIGIN = 0x10000000, LENGTH = 64K
+    FLASH (rx)  : ORIGIN = 0x8000000, LENGTH = 1024K
+}
+
+SECTIONS {
+    /* The vectors table goes into FLASH. */
+    .isr_vector : {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code. */
+        . = ALIGN(4);
+    } > FLASH
+
+    /* The program code and other data goes into FLASH. */
+    .text : {
+        . = ALIGN(4);
+        *(.text)
+        *(.text*)
+        *(.glue_7)                    /* Glue arm to thumb code. */
+        *(.glue_7t)                   /* Glue thumb to arm code. */
+        *(.eh_frame)
+        KEEP(*(.init))
+        KEEP(*(.fini))
+        . = ALIGN(4);
+        _end_of_text_section = .;     /* Export global symbol at end of code. */
+    } > FLASH
+
+    /* Constant data goes into FLASH. */
+    .rodata : {
+        . = ALIGN(4);
+        *(.rodata)
+        *(.rodata*)
+        . = ALIGN(4);
+    } > FLASH
+
+    .ARM.extab : {
+        *(.ARM.extab* .gnu.linkonce.armextab.*)
+    } > FLASH
+
+    .ARM : {
+        __exidx_start = .;
+        *(.ARM.exidx*)
+        __exidx_end = .;
+    } > FLASH
+
+    .preinit_array : {
+        PROVIDE_HIDDEN(__preinit_array_start = .);
+        KEEP(*(.preinit_array*))
+        PROVIDE_HIDDEN(__preinit_array_end = .);
+    } > FLASH
+
+    .init_array : {
+        PROVIDE_HIDDEN(__init_array_start = .);
+        KEEP(*(SORT(.init_array.*)))
+        KEEP(*(.init_array*))
+        PROVIDE_HIDDEN(__init_array_end = .);
+    } > FLASH
+
+    .fini_array : {
+        PROVIDE_HIDDEN(__fini_array_start = .);
+        KEEP(*(SORT(.fini_array.*)))
+        KEEP(*(.fini_array*))
+        PROVIDE_HIDDEN(__fini_array_end = .);
+    } > FLASH
+
+    _start_of_init_data_section = LOADADDR(.data);
+
+    /* Initialized data sections goes into RAM, load LMA copy after code. */
+    .data : {
+        . = ALIGN(4);
+        _start_of_data_section = .;   /* Export global symbol at data start. */
+        *(.data)
+        *(.data*)
+        . = ALIGN(4);
+        _end_of_data_section = .;     /* Export global symbol at data end. */
+    } > RAM AT > FLASH
+
+    _start_of_iccm_ram_section = LOADADDR(.ccmram);
+
+    /* CCM-RAM section. */
+    .ccmram : {
+        . = ALIGN(4);
+        _start_of_ccmram_section = .; /* Export global symbol at ccmram start. */
+        *(.ccmram)
+        *(.ccmram*)
+        . = ALIGN(4);
+        _end_of_ccmram_section = .;   /* Export global symbol at ccmram end. */
+    } > CCMRAM AT > FLASH
+
+    /* Uninitialized data section. */
+    . = ALIGN(4);
+    .bss : {
+        /* This is used by the startup in order to initialize the .bss secion. */
+        _start_of_bss_section = .;    /* Export global symbol at bss start. */
+        __bss_start__ = _start_of_bss_section;
+        *(.bss)
+        *(.bss*)
+        *(COMMON)
+        . = ALIGN(4);
+        _end_of_bss_section = .;      /* Export global symbol at bss end. */
+        __bss_end__ = _end_of_bss_section;
+    } > RAM
+
+    /* Used to check that there is enough RAM left. */
+    ._user_heap_stack : {
+        . = ALIGN(4);
+        PROVIDE(end = .);
+        PROVIDE(_end = .);
+        . = . + _size_of_heap;
+        . = . + _size_of_stack;
+        . = ALIGN(4);
+    } > RAM
+
+    /* Remove information from the standard libraries. */
+    /DISCARD/ : {
+        libc.a ( * )
+        libm.a ( * )
+        libgcc.a ( * )
+    }
+
+    .ARM.attributes 0 : {
+        *(.ARM.attributes)
+    }
+}
diff --git a/examples/baremetal/stm32f4discovery/blueblink/gcc/startup.s b/examples/baremetal/stm32f4discovery/blueblink/gcc/startup.s
new file mode 100644
index 000000000..d6a2104d1
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/gcc/startup.s
@@ -0,0 +1,211 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+.syntax unified
+.cpu cortex-m4
+.fpu softvfp
+.thumb
+
+// These symbols are exported from the linker script.
+.word _start_of_init_data_section
+.word _start_of_data_section
+.word _end_of_data_section
+.word _start_of_bss_section
+.word _end_of_bss_section
+.word _end_of_stack
+
+// Define the 'reset_handler' function, which is an entry point.
+.section .text.reset_handler
+.weak reset_handler
+.type reset_handler, %function
+reset_handler:
+    // Set the stack pointer.
+    ldr     sp, =_end_of_stack
+
+    // Copy the data segment initializers from flash to SRAM.
+    movs    r1, #0
+    b       _loop_copy_data_init
+_copy_data_init:
+    ldr     r3, =_start_of_init_data_section
+    ldr     r3, [r3, r1]
+    str     r3, [r0, r1]
+    adds    r1, r1, #4
+_loop_copy_data_init:
+    ldr     r0, =_start_of_data_section
+    ldr     r3, =_end_of_data_section
+    adds    r2, r0, r1
+    cmp     r2, r3
+    bcc     _copy_data_init
+    ldr     r2, =_start_of_bss_section
+    b       _loop_fill_zero_bss
+
+    // Zero fill the bss segment.
+_fill_zero_bss:
+    movs    r3, #0
+    str     r3, [r2], #4
+_loop_fill_zero_bss:
+    ldr     r3, = _end_of_bss_section
+    cmp     r2, r3
+    bcc     _fill_zero_bss
+
+    // Call the static constructors.
+    bl      __libc_init_array
+
+    // Call the application's entry point.
+    bl      main
+    bx      lr
+.size reset_handler, .-reset_handler
+
+// Define the empty vectors table.
+.section .isr_vector,"a",%progbits
+.type _vectors_table, %object
+.size _vectors_table, .-_vectors_table
+_vectors_table:
+    // Generic interrupts offset.
+    .word    _end_of_stack  // Initial stack pointer value.
+    .word    reset_handler  // Reset.
+    .word    0              // NMI.
+    .word    0              // Hard fault.
+    .word    0              // Memory management fault.
+    .word    0              // Bus fault.
+    .word    0              // Usage fault.
+    .word    0              // Reserved.
+    .word    0              // Reserved.
+    .word    0              // Reserved.
+    .word    0              // Reserved.
+    .word    0              // SVC.
+    .word    0              // Debug monitor.
+    .word    0              // Reserved.
+    .word    0              // PendSV.
+    .word    0              // SysTick.
+
+    // External interrupts offset.
+    .word    0              // Window WatchDog.
+    .word    0              // PVD through EXTI Line detection.
+    .word    0              // Tamper and TimeStamps through the EXTI line.
+    .word    0              // RTC Wakeup through the EXTI line.
+    .word    0              // FLASH.
+    .word    0              // RCC.
+    .word    0              // EXTI Line0.
+    .word    0              // EXTI Line1.
+    .word    0              // EXTI Line2.
+    .word    0              // EXTI Line3.
+    .word    0              // EXTI Line4.
+    .word    0              // DMA1 Stream 0.
+    .word    0              // DMA1 Stream 1.
+    .word    0              // DMA1 Stream 2.
+    .word    0              // DMA1 Stream 3.
+    .word    0              // DMA1 Stream 4.
+    .word    0              // DMA1 Stream 5.
+    .word    0              // DMA1 Stream 6.
+    .word    0              // ADC1, ADC2 and ADC3s.
+    .word    0              // CAN1 TX.
+    .word    0              // CAN1 RX0.
+    .word    0              // CAN1 RX1.
+    .word    0              // CAN1 SCE.
+    .word    0              // External Line[9:5]s.
+    .word    0              // TIM1 Break and TIM9.
+    .word    0              // TIM1 Update and TIM10.
+    .word    0              // TIM1 Trigger and Commutation and TIM11.
+    .word    0              // TIM1 Capture Compare.
+    .word    0              // TIM2.
+    .word    0              // TIM3.
+    .word    0              // TIM4.
+    .word    0              // I2C1 Event.
+    .word    0              // I2C1 Error.
+    .word    0              // I2C2 Event.
+    .word    0              // I2C2 Error.
+    .word    0              // SPI1.
+    .word    0              // SPI2.
+    .word    0              // USART1.
+    .word    0              // USART2.
+    .word    0              // USART3.
+    .word    0              // External Line[15:10]s.
+    .word    0              // RTC Alarm (A and B) through EXTI Line.
+    .word    0              // USB OTG FS Wakeup through EXTI line.
+    .word    0              // TIM8 Break and TIM12.
+    .word    0              // TIM8 Update and TIM13.
+    .word    0              // TIM8 Trigger and Commutation and TIM14.
+    .word    0              // TIM8 Capture Compare.
+    .word    0              // DMA1 Stream7.
+    .word    0              // FSMC.
+    .word    0              // SDIO.
+    .word    0              // TIM5.
+    .word    0              // SPI3.
+    .word    0              // UART4.
+    .word    0              // UART5.
+    .word    0              // TIM6 and DAC1&2 underrun errors.
+    .word    0              // TIM7.
+    .word    0              // DMA2 Stream 0.
+    .word    0              // DMA2 Stream 1.
+    .word    0              // DMA2 Stream 2.
+    .word    0              // DMA2 Stream 3.
+    .word    0              // DMA2 Stream 4.
+    .word    0              // Ethernet.
+    .word    0              // Ethernet Wakeup through EXTI line.
+    .word    0              // CAN2 TX.
+    .word    0              // CAN2 RX0.
+    .word    0              // CAN2 RX1.
+    .word    0              // CAN2 SCE.
+    .word    0              // USB OTG FS.
+    .word    0              // DMA2 Stream 5.
+    .word    0              // DMA2 Stream 6.
+    .word    0              // DMA2 Stream 7.
+    .word    0              // USART6.
+    .word    0              // I2C3 event.
+    .word    0              // I2C3 error.
+    .word    0              // USB OTG HS End Point 1 Out.
+    .word    0              // USB OTG HS End Point 1 In.
+    .word    0              // USB OTG HS Wakeup through EXTI.
+    .word    0              // USB OTG HS.
+    .word    0              // DCMI.
+    .word    0              // CRYP crypto.
+    .word    0              // Hash and Rng.
+    .word    0              // FPU.
diff --git a/examples/baremetal/stm32f4discovery/blueblink/gpio.c b/examples/baremetal/stm32f4discovery/blueblink/gpio.c
new file mode 100644
index 000000000..e337f8d24
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/gpio.c
@@ -0,0 +1,79 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "gpio.h"
+#include "system.h"
+
+#define GPIO_BLUE_LED_PIN_POS   (15u)
+#define GPIO_BLUE_LED_PIN       (1u << GPIO_BLUE_LED_PIN_POS)
+
+// Output push pull mode.
+#define GPIO_MODE_OUTPUT_PP     (0x00000001u)
+
+// Bit definition for RCC_AHB1ENR register.
+#define RCC_AHB1ENR_GPIODEN     (0x00000008u)
+// Bits definition for GPIO_MODER register.
+#define GPIO_MODER_MODE0        (0x00000003u)
+
+void gpio_init_blue_led(void)
+{
+    // Enable RCC clock on GPIOD port.
+    RCC_REGS_MAP->AHB1ENR |= RCC_AHB1ENR_GPIODEN;
+    // Configure GPIO pin #15 as an output.
+    uint32_t value = GPIOD_REGS_MAP->MODER;
+    value &= ~(GPIO_MODER_MODE0 << (GPIO_BLUE_LED_PIN_POS * 2u));
+    value |= (GPIO_MODE_OUTPUT_PP << (GPIO_BLUE_LED_PIN_POS * 2u));
+    GPIOD_REGS_MAP->MODER = value;
+}
+
+void gpio_toggle_blue_led(void)
+{
+    GPIOD_REGS_MAP->ODR ^= GPIO_BLUE_LED_PIN;
+}
diff --git a/examples/baremetal/stm32f4discovery/blueblink/gpio.h b/examples/baremetal/stm32f4discovery/blueblink/gpio.h
new file mode 100644
index 000000000..560dcbac7
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/gpio.h
@@ -0,0 +1,65 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef GPIO_H
+#define GPIO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void gpio_init_blue_led(void);
+void gpio_toggle_blue_led(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // GPIO_H
diff --git a/examples/baremetal/stm32f4discovery/blueblink/iar/flash.icf b/examples/baremetal/stm32f4discovery/blueblink/iar/flash.icf
new file mode 100644
index 000000000..04cff04c4
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/iar/flash.icf
@@ -0,0 +1,77 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+define symbol _start_of_intvec_section = 0x08000000;
+
+define symbol _start_of_ram_section    = 0x20000000;
+define symbol _end_of_ram_section      = 0x2001FFFF;
+define symbol _start_of_ccmram_section = 0x10000000;
+define symbol _end_of_ccmram_section   = 0x1000FFFF;
+define symbol _start_of_flash_section  = 0x08000000;
+define symbol _end_of_flash_section    = 0x080FFFFF;
+
+define symbol _min_stack_size = 0x400;
+define symbol _min_heap_size = 0x200;
+
+define memory mem with size = 4G;
+define region flash_section = mem:[from _start_of_flash_section to _end_of_flash_section];
+define region ram_section = mem:[from _start_of_ram_section to _end_of_ram_section];
+define region ccmram_section = mem:[from _start_of_ccmram_section to _end_of_ccmram_section];
+
+define block CSTACK with alignment = 8, size = _min_stack_size { };
+define block HEAP with alignment = 8, size = _min_heap_size { };
+
+initialize by copy { readwrite };
+do not initialize { section .noinit };
+
+place at address mem:_start_of_intvec_section { readonly section .intvec };
+
+place in flash_section { readonly };
+place in ram_section { readwrite, block CSTACK, block HEAP };
diff --git a/examples/baremetal/stm32f4discovery/blueblink/iar/startup.s b/examples/baremetal/stm32f4discovery/blueblink/iar/startup.s
new file mode 100644
index 000000000..fe88e6bc8
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/iar/startup.s
@@ -0,0 +1,171 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+    MODULE  ?cstartup
+
+    SECTION CSTACK:DATA:NOROOT(3)
+    SECTION .intvec:CODE:NOROOT(2)
+
+    EXTERN __iar_program_start
+
+    PUBLIC _vectors_table
+    DATA
+_vectors_table
+    ;; Generic interrupts offset.
+    DCD    sfe(CSTACK)      ; Initial stack pointer value.
+    DCD    reset_handler    ; Reset.
+    DCD    0                ; NMI.
+    DCD    0                ; Hard fault.
+    DCD    0                ; Memory management fault.
+    DCD    0                ; Bus fault.
+    DCD    0                ; Usage fault.
+    DCD    0                ; Reserved.
+    DCD    0                ; Reserved.
+    DCD    0                ; Reserved.
+    DCD    0                ; Reserved.
+    DCD    0                ; SVC.
+    DCD    0                ; Debug monitor.
+    DCD    0                ; Reserved.
+    DCD    0                ; PendSV.
+    DCD    0                ; SysTick.
+    ;; External interrupts offset.
+    DCD    0                ; Window WatchDog.
+    DCD    0                ; PVD through EXTI Line detection.
+    DCD    0                ; Tamper and TimeStamps through the EXTI line.
+    DCD    0                ; RTC Wakeup through the EXTI line.
+    DCD    0                ; FLASH.
+    DCD    0                ; RCC.
+    DCD    0                ; EXTI Line0.
+    DCD    0                ; EXTI Line1.
+    DCD    0                ; EXTI Line2.
+    DCD    0                ; EXTI Line3.
+    DCD    0                ; EXTI Line4.
+    DCD    0                ; DMA1 Stream 0.
+    DCD    0                ; DMA1 Stream 1.
+    DCD    0                ; DMA1 Stream 2.
+    DCD    0                ; DMA1 Stream 3.
+    DCD    0                ; DMA1 Stream 4.
+    DCD    0                ; DMA1 Stream 5.
+    DCD    0                ; DMA1 Stream 6.
+    DCD    0                ; ADC1, ADC2 and ADC3s.
+    DCD    0                ; CAN1 TX.
+    DCD    0                ; CAN1 RX0.
+    DCD    0                ; CAN1 RX1.
+    DCD    0                ; CAN1 SCE.
+    DCD    0                ; External Line[9:5]s.
+    DCD    0                ; TIM1 Break and TIM9.
+    DCD    0                ; TIM1 Update and TIM10.
+    DCD    0                ; TIM1 Trigger and Commutation and TIM11.
+    DCD    0                ; TIM1 Capture Compare.
+    DCD    0                ; TIM2.
+    DCD    0                ; TIM3.
+    DCD    0                ; TIM4.
+    DCD    0                ; I2C1 Event.
+    DCD    0                ; I2C1 Error.
+    DCD    0                ; I2C2 Event.
+    DCD    0                ; I2C2 Error.
+    DCD    0                ; SPI1.
+    DCD    0                ; SPI2.
+    DCD    0                ; USART1.
+    DCD    0                ; USART2.
+    DCD    0                ; USART3.
+    DCD    0                ; External Line[15:10]s.
+    DCD    0                ; RTC Alarm (A and B) through EXTI Line.
+    DCD    0                ; USB OTG FS Wakeup through EXTI line.
+    DCD    0                ; TIM8 Break and TIM12.
+    DCD    0                ; TIM8 Update and TIM13.
+    DCD    0                ; TIM8 Trigger and Commutation and TIM14.
+    DCD    0                ; TIM8 Capture Compare.
+    DCD    0                ; DMA1 Stream7.
+    DCD    0                ; FSMC.
+    DCD    0                ; SDIO.
+    DCD    0                ; TIM5.
+    DCD    0                ; SPI3.
+    DCD    0                ; UART4.
+    DCD    0                ; UART5.
+    DCD    0                ; TIM6 and DAC1&2 underrun errors.
+    DCD    0                ; TIM7.
+    DCD    0                ; DMA2 Stream 0.
+    DCD    0                ; DMA2 Stream 1.
+    DCD    0                ; DMA2 Stream 2.
+    DCD    0                ; DMA2 Stream 3.
+    DCD    0                ; DMA2 Stream 4.
+    DCD    0                ; Ethernet.
+    DCD    0                ; Ethernet Wakeup through EXTI line.
+    DCD    0                ; CAN2 TX.
+    DCD    0                ; CAN2 RX0.
+    DCD    0                ; CAN2 RX1.
+    DCD    0                ; CAN2 SCE.
+    DCD    0                ; USB OTG FS.
+    DCD    0                ; DMA2 Stream 5.
+    DCD    0                ; DMA2 Stream 6.
+    DCD    0                ; DMA2 Stream 7.
+    DCD    0                ; USART6.
+    DCD    0                ; I2C3 event.
+    DCD    0                ; I2C3 error.
+    DCD    0                ; USB OTG HS End Point 1 Out.
+    DCD    0                ; USB OTG HS End Point 1 In.
+    DCD    0                ; USB OTG HS Wakeup through EXTI.
+    DCD    0                ; USB OTG HS.
+    DCD    0                ; DCMI.
+    DCD    0                ; CRYP crypto.
+    DCD    0                ; Hash and RNG.
+    DCD    0                ; FPU.
+
+    ;; Reset handler.
+    THUMB
+    PUBWEAK reset_handler
+    SECTION .text:CODE:REORDER:NOROOT(2)
+reset_handler
+    BLX    R0
+    LDR    R0, =__iar_program_start
+    BX     R0
+
+    END
diff --git a/examples/baremetal/stm32f4discovery/blueblink/keil/flash.sct b/examples/baremetal/stm32f4discovery/blueblink/keil/flash.sct
new file mode 100644
index 000000000..7a5500182
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/keil/flash.sct
@@ -0,0 +1,64 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+;; Load region size_region.
+LR_IROM1 0x08000000 0x00100000 {
+    ;; Load address = execution address.
+    ER_IROM1 0x08000000 0x00100000 {
+        *.o (RESET, +First)
+        *(InRoot$$Sections)
+        .ANY (+RO)
+    }
+
+    ; RW data.
+    RW_IRAM1 0x20000000 0x00020000 {
+        .ANY (+RW +ZI)
+    }
+}
diff --git a/examples/baremetal/stm32f4discovery/blueblink/keil/startup.s b/examples/baremetal/stm32f4discovery/blueblink/keil/startup.s
new file mode 100644
index 000000000..38e5b5058
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/keil/startup.s
@@ -0,0 +1,184 @@
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;; Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+;; Contact: https://www.qt.io/licensing/
+;;
+;; This file is part of the examples of Qbs.
+;;
+;; $QT_BEGIN_LICENSE:BSD$
+;; Commercial License Usage
+;; Licensees holding valid commercial Qt licenses may use this file in
+;; accordance with the commercial license agreement provided with the
+;; Software or, alternatively, in accordance with the terms contained in
+;; a written agreement between you and The Qt Company. For licensing terms
+;; and conditions see https://www.qt.io/terms-conditions. For further
+;; information use the contact form at https://www.qt.io/contact-us.
+;;
+;; BSD License Usage
+;; Alternatively, you may use this file under the terms of the BSD license
+;; as follows:
+;;
+;; "Redistribution and use in source and binary forms, with or without
+;; modification, are permitted provided that the following conditions are
+;; met:
+;;   * Redistributions of source code must retain the above copyright
+;;     notice, this list of conditions and the following disclaimer.
+;;   * Redistributions in binary form must reproduce the above copyright
+;;     notice, this list of conditions and the following disclaimer in
+;;     the documentation and/or other materials provided with the
+;;     distribution.
+;;   * Neither the name of The Qt Company Ltd nor the names of its
+;;     contributors may be used to endorse or promote products derived
+;;     from this software without specific prior written permission.
+;;
+;;
+;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+;; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+;;
+;; $QT_END_LICENSE$
+;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+_size_of_stack EQU 0x400
+_size_of_heap EQU 0x200
+
+;; Stack configuration.
+    AREA STACK, NOINIT, READWRITE, ALIGN=3
+_start_of_stack SPACE _size_of_stack
+_end_of_stack
+
+;; Heap configuration.
+    AREA HEAP, NOINIT, READWRITE, ALIGN=3
+_start_of_heap SPACE _size_of_heap
+_end_of_heap
+
+    PRESERVE8
+    THUMB
+
+;; Define the empty vectors table.
+    AREA RESET, DATA, READONLY
+_vectors_table
+    ;; Generic interrupts offset.
+    DCD    _end_of_stack    ; Initial stack pointer value.
+    DCD    reset_handler    ; Reset.
+    DCD    0                ; NMI.
+    DCD    0                ; Hard fault.
+    DCD    0                ; Memory management fault.
+    DCD    0                ; Bus fault.
+    DCD    0                ; Usage fault.
+    DCD    0                ; Reserved.
+    DCD    0                ; Reserved.
+    DCD    0                ; Reserved.
+    DCD    0                ; Reserved.
+    DCD    0                ; SVC.
+    DCD    0                ; Debug monitor.
+    DCD    0                ; Reserved.
+    DCD    0                ; PendSV.
+    DCD    0                ; SysTick.
+    ;; External interrupts offset.
+    DCD    0                ; Window WatchDog.
+    DCD    0                ; PVD through EXTI Line detection.
+    DCD    0                ; Tamper and TimeStamps through the EXTI line.
+    DCD    0                ; RTC Wakeup through the EXTI line.
+    DCD    0                ; FLASH.
+    DCD    0                ; RCC.
+    DCD    0                ; EXTI Line0.
+    DCD    0                ; EXTI Line1.
+    DCD    0                ; EXTI Line2.
+    DCD    0                ; EXTI Line3.
+    DCD    0                ; EXTI Line4.
+    DCD    0                ; DMA1 Stream 0.
+    DCD    0                ; DMA1 Stream 1.
+    DCD    0                ; DMA1 Stream 2.
+    DCD    0                ; DMA1 Stream 3.
+    DCD    0                ; DMA1 Stream 4.
+    DCD    0                ; DMA1 Stream 5.
+    DCD    0                ; DMA1 Stream 6.
+    DCD    0                ; ADC1, ADC2 and ADC3s.
+    DCD    0                ; CAN1 TX.
+    DCD    0                ; CAN1 RX0.
+    DCD    0                ; CAN1 RX1.
+    DCD    0                ; CAN1 SCE.
+    DCD    0                ; External Line[9:5]s.
+    DCD    0                ; TIM1 Break and TIM9.
+    DCD    0                ; TIM1 Update and TIM10.
+    DCD    0                ; TIM1 Trigger and Commutation and TIM11.
+    DCD    0                ; TIM1 Capture Compare.
+    DCD    0                ; TIM2.
+    DCD    0                ; TIM3.
+    DCD    0                ; TIM4.
+    DCD    0                ; I2C1 Event.
+    DCD    0                ; I2C1 Error.
+    DCD    0                ; I2C2 Event.
+    DCD    0                ; I2C2 Error.
+    DCD    0                ; SPI1.
+    DCD    0                ; SPI2.
+    DCD    0                ; USART1.
+    DCD    0                ; USART2.
+    DCD    0                ; USART3.
+    DCD    0                ; External Line[15:10]s.
+    DCD    0                ; RTC Alarm (A and B) through EXTI Line.
+    DCD    0                ; USB OTG FS Wakeup through EXTI line.
+    DCD    0                ; TIM8 Break and TIM12.
+    DCD    0                ; TIM8 Update and TIM13.
+    DCD    0                ; TIM8 Trigger and Commutation and TIM14.
+    DCD    0                ; TIM8 Capture Compare.
+    DCD    0                ; DMA1 Stream7.
+    DCD    0                ; FMC.
+    DCD    0                ; SDIO.
+    DCD    0                ; TIM5.
+    DCD    0                ; SPI3.
+    DCD    0                ; UART4.
+    DCD    0                ; UART5.
+    DCD    0                ; TIM6 and DAC1&2 underrun errors.
+    DCD    0                ; TIM7.
+    DCD    0                ; DMA2 Stream 0.
+    DCD    0                ; DMA2 Stream 1.
+    DCD    0                ; DMA2 Stream 2.
+    DCD    0                ; DMA2 Stream 3.
+    DCD    0                ; DMA2 Stream 4.
+    DCD    0                ; Ethernet.
+    DCD    0                ; Ethernet Wakeup through EXTI line.
+    DCD    0                ; CAN2 TX.
+    DCD    0                ; CAN2 RX0.
+    DCD    0                ; CAN2 RX1.
+    DCD    0                ; CAN2 SCE.
+    DCD    0                ; USB OTG FS.
+    DCD    0                ; DMA2 Stream 5.
+    DCD    0                ; DMA2 Stream 6.
+    DCD    0                ; DMA2 Stream 7.
+    DCD    0                ; USART6.
+    DCD    0                ; I2C3 event.
+    DCD    0                ; I2C3 error.
+    DCD    0                ; USB OTG HS End Point 1 Out.
+    DCD    0                ; USB OTG HS End Point 1 In.
+    DCD    0                ; USB OTG HS Wakeup through EXTI.
+    DCD    0                ; USB OTG HS.
+    DCD    0                ; DCMI.
+    DCD    0                ; Reserved.
+    DCD    0                ; Hash and Rng.
+    DCD    0                ; FPU.
+_end_of_vectors_table
+
+_size_of_vectors_table EQU _end_of_vectors_table - _vectors_table
+
+    AREA |.text|, CODE, READONLY
+;; Reset handler.
+reset_handler PROC
+    EXPORT reset_handler [WEAK]
+    IMPORT main
+    LDR    R0, =main
+    BX     R0
+    ENDP
+    ALIGN
+
+    END
diff --git a/examples/baremetal/stm32f4discovery/blueblink/main.c b/examples/baremetal/stm32f4discovery/blueblink/main.c
new file mode 100644
index 000000000..ef69fc8e6
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/main.c
@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "gpio.h"
+
+#include <stdint.h>
+
+static void some_delay(uint32_t counts)
+{
+    for (uint32_t index = 0u; index < counts; ++index)
+        __asm("nop");
+}
+
+int main(void)
+{
+    gpio_init_blue_led();
+
+    while (1) {
+        gpio_toggle_blue_led();
+        some_delay(100000u);
+    }
+}
diff --git a/examples/baremetal/stm32f4discovery/blueblink/system.h b/examples/baremetal/stm32f4discovery/blueblink/system.h
new file mode 100644
index 000000000..6e7190026
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/blueblink/system.h
@@ -0,0 +1,129 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SYSTEM_H
+#define SYSTEM_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __IO  volatile
+
+// General purpose input/output registers map.
+struct gpio_regs_map {
+    __IO uint32_t MODER;
+    __IO uint32_t OTYPER;
+    __IO uint32_t OSPEEDR;
+    __IO uint32_t PUPDR;
+    __IO uint32_t IDR;
+    __IO uint32_t ODR;
+    __IO uint32_t BSRR;
+    __IO uint32_t LCKR;
+    __IO uint32_t AFR[2u];
+};
+
+// Reset and clock control registers map.
+struct rcc_regs_map {
+    __IO uint32_t CR;
+    __IO uint32_t PLLCFGR;
+    __IO uint32_t CFGR;
+    __IO uint32_t CIR;
+    __IO uint32_t AHB1RSTR;
+    __IO uint32_t AHB2RSTR;
+    __IO uint32_t AHB3RSTR;
+    uint32_t      RESERVED0;
+    __IO uint32_t APB1RSTR;
+    __IO uint32_t APB2RSTR;
+    uint32_t      RESERVED1[2u];
+    __IO uint32_t AHB1ENR;
+    __IO uint32_t AHB2ENR;
+    __IO uint32_t AHB3ENR;
+    uint32_t      RESERVED2;
+    __IO uint32_t APB1ENR;
+    __IO uint32_t APB2ENR;
+    uint32_t      RESERVED3[2u];
+    __IO uint32_t AHB1LPENR;
+    __IO uint32_t AHB2LPENR;
+    __IO uint32_t AHB3LPENR;
+    uint32_t      RESERVED4;
+    __IO uint32_t APB1LPENR;
+    __IO uint32_t APB2LPENR;
+    uint32_t      RESERVED5[2u];
+    __IO uint32_t BDCR;
+    __IO uint32_t CSR;
+    uint32_t      RESERVED6[2u];
+    __IO uint32_t SSCGR;
+    __IO uint32_t PLLI2SCFGR;
+};
+
+#define PERIPH_ADDRESS      (0x40000000u)
+
+#define APB2PERIPH_ADDRESS  (PERIPH_ADDRESS + 0x00010000u)
+#define AHB1PERIPH_ADDRESS  (PERIPH_ADDRESS + 0x00020000u)
+
+// APB2 peripherals.
+#define SYSCFG_REGS_ADDRESS (APB2PERIPH_ADDRESS + 0x3800u)
+#define EXTI_REGS_ADDRESS   (APB2PERIPH_ADDRESS + 0x3C00u)
+
+// AHB1 peripherals.
+#define GPIOD_REGS_ADDRESS  (AHB1PERIPH_ADDRESS + 0x0C00u)
+#define RCC_REGS_ADDRESS    (AHB1PERIPH_ADDRESS + 0x3800u)
+
+#define GPIOD_REGS_MAP      ((struct gpio_regs_map *)GPIOD_REGS_ADDRESS)
+#define RCC_REGS_MAP        ((struct rcc_regs_map *)RCC_REGS_ADDRESS)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // SYSTEM_H
diff --git a/examples/baremetal/stm32f4discovery/stm32f4discovery.qbs b/examples/baremetal/stm32f4discovery/stm32f4discovery.qbs
new file mode 100644
index 000000000..a402848ca
--- /dev/null
+++ b/examples/baremetal/stm32f4discovery/stm32f4discovery.qbs
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qbs.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import qbs
+
+Project {
+    name: "Examples for stm32f4discovery board"
+    references: [
+        "blueblink/blueblink.qbs"
+    ]
+}
diff --git a/examples/examples.qbs b/examples/examples.qbs
index 4e51bdbaf..c6c1f4ac3 100644
--- a/examples/examples.qbs
+++ b/examples/examples.qbs
@@ -64,5 +64,6 @@ Project {
         "install-bundle/install-bundle.qbs",
         "protobuf/cpp/addressbook.qbs",
         "protobuf/objc/addressbook.qbs",
+        "baremetal/baremetal.qbs"
     ]
 }