baremetal: Add LED blink example for stm32f103 MCU using Keil toolchain

Change-Id: Id52108a5e4397efb28e6e8319653fde87a256720
Reviewed-by: Ivan Komissarov <ABBAPOH@gmail.com>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

10 files changed, 702 insertions, 1 deletions

diff --git a/examples/baremetal/baremetal.qbs b/examples/baremetal/baremetal.qbs
index eba504512..38fc7a61c 100644
--- a/examples/baremetal/baremetal.qbs
+++ b/examples/baremetal/baremetal.qbs
@@ -58,6 +58,7 @@ Project {
         "cc2540usbdongle/cc2540usbdongle.qbs",
         "stm8s103f3/stm8s103f3.qbs",
         "msp430f5529/msp430f5529.qbs",
-        "cy7c68013a/cy7c68013a.qbs"
+        "cy7c68013a/cy7c68013a.qbs",
+        "stm32f103/stm32f103.qbs",
     ]
 }
diff --git a/examples/baremetal/stm32f103/greenblink/README.md b/examples/baremetal/stm32f103/greenblink/README.md
new file mode 100644
index 000000000..87b5a709f
--- /dev/null
+++ b/examples/baremetal/stm32f103/greenblink/README.md
@@ -0,0 +1,8 @@
+This example demonstrates how to build a bare-metal application using
+different ARM toolchains. It is designed for the stm32f103 "Blue Pill"
+evaluation kit (based on stm32f103c8 MCU) and simply flashes the green
+LED on the board.
+
+The following toolchains are supported:
+
+  * KEIL Microcontroller Development Kit
diff --git a/examples/baremetal/stm32f103/greenblink/gpio.c b/examples/baremetal/stm32f103/greenblink/gpio.c
new file mode 100644
index 000000000..84c87a2b9
--- /dev/null
+++ b/examples/baremetal/stm32f103/greenblink/gpio.c
@@ -0,0 +1,83 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 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_GREEN_LED_PIN_POS      (13u)
+#define GPIO_GREEN_LED_PIN          (1u << GPIO_GREEN_LED_PIN_POS)
+
+// Bit definition for RCC_APB2ENR register.
+#define RCC_APB2ENR_IOPCEN_POS      (4u)
+#define RCC_APB2ENR_IOPCEN          (0x1u << RCC_APB2ENR_IOPCEN_POS)
+
+// Bit definition for GPIO_CRL register.
+#define GPIO_CRL_MODE_POS           (0u) // MODE field position.
+#define GPIO_CRL_MODE_MSK           (0x3u << GPIO_CRL_MODE_POS) // MODE field mask.
+#define GPIO_CRL_MODE_OUT_FREQ_LOW  (0x2u << GPIO_CRL_MODE_POS) // As output with low frequency.
+
+#define GPIO_CRL_CNF_POS            (2u) // CNF field position.
+#define GPIO_CRL_CNF_MSK            (0x3u << GPIO_CRL_CNF_POS) // CNF field mask.
+#define GPIO_CRL_CNF_OUTPUT_PP      (0x00000000u) // General purpose output push-pull.
+
+void gpio_init_green_led(void)
+{
+    // Enable RCC clock on GPIOC port.
+    RCC_REGS_MAP->APB2ENR |= RCC_APB2ENR_IOPCEN;
+    // Configure GPIOC pin #13.
+    const uint32_t offset = ((GPIO_GREEN_LED_PIN_POS - 8u) << 2u);
+    GPIOC_REGS_MAP->CRH &= ~((GPIO_CRL_MODE_MSK | GPIO_CRL_CNF_MSK) << offset);
+    GPIOC_REGS_MAP->CRH |= ((GPIO_CRL_MODE_OUT_FREQ_LOW | GPIO_CRL_CNF_OUTPUT_PP) << offset);
+}
+
+void gpio_toggle_green_led(void)
+{
+    GPIOC_REGS_MAP->ODR ^= GPIO_GREEN_LED_PIN;
+}
diff --git a/examples/baremetal/stm32f103/greenblink/gpio.h b/examples/baremetal/stm32f103/greenblink/gpio.h
new file mode 100644
index 000000000..9e931b715
--- /dev/null
+++ b/examples/baremetal/stm32f103/greenblink/gpio.h
@@ -0,0 +1,65 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 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_green_led(void);
+void gpio_toggle_green_led(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // GPIO_H
diff --git a/examples/baremetal/stm32f103/greenblink/greenblink.qbs b/examples/baremetal/stm32f103/greenblink/greenblink.qbs
new file mode 100644
index 000000000..13f5a92a1
--- /dev/null
+++ b/examples/baremetal/stm32f103/greenblink/greenblink.qbs
@@ -0,0 +1,105 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 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.startsWith("arm"))
+            return false;
+        return qbs.toolchain.contains("keil")
+    }
+    name: "stm32f103-greenblink"
+    cpp.cLanguageVersion: "c99"
+    cpp.positionIndependentCode: false
+
+    //
+    // KEIL-specific properties and sources.
+    //
+
+    Properties {
+        condition: qbs.toolchain.contains("keil")
+        cpp.driverFlags: [
+            "--cpu", "cortex-m3"
+        ]
+    }
+
+    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/stm32f103/greenblink/keil/flash.sct b/examples/baremetal/stm32f103/greenblink/keil/flash.sct
new file mode 100644
index 000000000..3547ca2c0
--- /dev/null
+++ b/examples/baremetal/stm32f103/greenblink/keil/flash.sct
@@ -0,0 +1,65 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 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 0x00010000 {
+    ;; Load address = execution address.
+    ER_IROM1 0x08000000 0x00010000 {
+        *.o (RESET, +First)
+        *(InRoot$$Sections)
+        .ANY (+RO)
+        .ANY (+XO)
+    }
+
+    ; RW data.
+    RW_IRAM1 0x20000000 0x00005000 {
+        .ANY (+RW +ZI)
+    }
+}
diff --git a/examples/baremetal/stm32f103/greenblink/keil/startup.s b/examples/baremetal/stm32f103/greenblink/keil/startup.s
new file mode 100644
index 000000000..d80de94c6
--- /dev/null
+++ b/examples/baremetal/stm32f103/greenblink/keil/startup.s
@@ -0,0 +1,145 @@
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;; Copyright (C) 2020 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 channel 1.
+    DCD    0                ; DMA1 channel 2.
+    DCD    0                ; DMA1 channel 3.
+    DCD    0                ; DMA1 channel 4.
+    DCD    0                ; DMA1 channel 5.
+    DCD    0                ; DMA1 channel 6.
+    DCD    0                ; DMA1 channel 7.
+    DCD    0                ; ADC1/2.
+    DCD    0                ; USB high priority or CAN1 TX.
+    DCD    0                ; USB low priority or CAN1 RX0.
+    DCD    0                ; CAN1 RX1.
+    DCD    0                ; CAN1 SCE.
+    DCD    0                ; EXTI line 9..5.
+    DCD    0                ; TIM1 break.
+    DCD    0                ; TIM1 update.
+    DCD    0                ; TIM1 trigger and commutation.
+    DCD    0                ; IM1 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                ; EXTI line 15..10.
+    DCD    0                ; RTC alarm through EXTI line.
+    DCD    0                ; USB wakeup from suspend.
+_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/stm32f103/greenblink/main.c b/examples/baremetal/stm32f103/greenblink/main.c
new file mode 100644
index 000000000..21bc5badc
--- /dev/null
+++ b/examples/baremetal/stm32f103/greenblink/main.c
@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 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_green_led();
+
+    while (1) {
+        gpio_toggle_green_led();
+        some_delay(100000u);
+    }
+}
diff --git a/examples/baremetal/stm32f103/greenblink/system.h b/examples/baremetal/stm32f103/greenblink/system.h
new file mode 100644
index 000000000..d18854bea
--- /dev/null
+++ b/examples/baremetal/stm32f103/greenblink/system.h
@@ -0,0 +1,102 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 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 CRL;
+    __IO uint32_t CRH;
+    __IO uint32_t IDR;
+    __IO uint32_t ODR;
+    __IO uint32_t BSRR;
+    __IO uint32_t BRR;
+    __IO uint32_t LCKR;
+};
+
+// Reset and clock control registers map.
+struct rcc_regs_map {
+    __IO uint32_t CR;
+    __IO uint32_t CFGR;
+    __IO uint32_t CIR;
+    __IO uint32_t APB2RSTR;
+    __IO uint32_t APB1RSTR;
+    __IO uint32_t AHBENR;
+    __IO uint32_t APB2ENR;
+    __IO uint32_t APB1ENR;
+    __IO uint32_t BDCR;
+    __IO uint32_t CSR;
+};
+
+#define PERIPH_ADDRESS      (0x40000000u)
+
+#define APB2PERIPH_ADDRESS  (PERIPH_ADDRESS + 0x00010000u)
+#define AHBPERIPH_ADDRESS   (PERIPH_ADDRESS + 0x00020000u)
+
+#define GPIOC_REGS_ADDRESS  (APB2PERIPH_ADDRESS + 0x00001000u)
+#define RCC_REGS_ADDRESS    (AHBPERIPH_ADDRESS + 0x00001000u)
+
+#define GPIOC_REGS_MAP      ((struct gpio_regs_map *)GPIOC_REGS_ADDRESS)
+#define RCC_REGS_MAP        ((struct rcc_regs_map *)RCC_REGS_ADDRESS)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // SYSTEM_H
diff --git a/examples/baremetal/stm32f103/stm32f103.qbs b/examples/baremetal/stm32f103/stm32f103.qbs
new file mode 100644
index 000000000..bb5ab33e7
--- /dev/null
+++ b/examples/baremetal/stm32f103/stm32f103.qbs
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 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 stm32f103 board"
+    references: [
+        "greenblink/greenblink.qbs"
+    ]
+}