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64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/*
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* Copyright (C) 2014 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup board_stm32f4discovery
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* @{
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*
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* @file
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* @brief Board specific implementations for the STM32F4Discovery evaluation board
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include "board.h"
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static void leds_init(void);
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void board_init(void)
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{
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/* initialize the boards LEDs, this is done first for debugging purposes */
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leds_init();
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/* initialize the CPU */
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cpu_init();
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}
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/**
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* @brief Initialize the boards on-board LEDs (LD3 and LD4)
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*
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* The LED initialization is hard-coded in this function. As the LEDs are soldered
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* onto the board they are fixed to their CPU pins.
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*
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* The LEDs are connected to the following pins:
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* - LD3: PD13
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* - LD4: PD12
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* - LD5: PD14
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* - LD6: PD15
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*/
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static void leds_init(void)
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{
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/* enable clock for port GPIOD */
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RCC->AHB1ENR |= RCC_AHB1ENR_GPIODEN;
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/* configure pins as general outputs */
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LED_PORT->MODER &= ~(0xff000000);
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LED_PORT->MODER |= 0x55000000;
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/* set output speed high-speed */
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LED_PORT->OSPEEDR |= 0xff000000;
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/* set output type to push-pull */
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LED_PORT->OTYPER &= ~(0xf000);
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/* disable pull resistors */
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LED_PORT->PUPDR &= ~(0xff000000);
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/* turn all LEDs off */
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LED_PORT->BSRRH = 0xf000;
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}
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