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diff --git a/examples/baremetal/stm32f4discovery/blueblink/gpio.c b/examples/baremetal/stm32f4discovery/blueblink/gpio.c
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+/****************************************************************************
+**
+** 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;
+}