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https://github.com/RIOT-OS/RIOT.git
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14be504b6a
cpu: Add support for STM32F401xE cpu boards: Add support for Nucleo-f401 boards/nucleo-f401: New line fixes and comment on green led pin board/nucleo-f401: Added LED GPIO board/nucleo-f401: Fixed LED GPIO board/nucleo-f401: Minor fixes
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/*
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* Copyright (C) 2015 Lari Lehtomäki
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup boards_nucleo-f401
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* @{
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*
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* @file
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* @brief Board specific implementations for the nucleo-f401 board
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*
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* @author Lari Lehtomäki <lari@lehtomaki.fi>
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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 CPU */
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cpu_init();
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/* initialize the boards LEDs */
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leds_init();
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}
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/**
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* @brief Initialize the boards on-board LED
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*
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* The LED initialization is hard-coded in this function. As the LED is
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* soldered onto the board it is fixed to its CPU pins.
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*
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* The green LED is connected to pin PA5
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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 GPIOA */
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RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
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/* set output speed to 50MHz */
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LED_GREEN_PORT->OSPEEDR |= (0x3 << LED_GREEN_PIN * 2);
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/* set output type to push-pull */
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LED_GREEN_PORT->OTYPER &= ~(1 << LED_GREEN_PIN);
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/* configure pins as general outputs */
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LED_GREEN_PORT->MODER &= ~(0x3 << LED_GREEN_PIN * 2);
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LED_GREEN_PORT->MODER |= (0x1 << LED_GREEN_PIN * 2);
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/* disable pull resistors */
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LED_GREEN_PORT->PUPDR &= ~(0x3 << LED_GREEN_PIN * 2);
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/* turn all LEDs off */
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LED_GREEN_PORT->BSRRL &= (1 << LED_GREEN_PIN);
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}
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