RIOT/boards/nucleo-l1/board.c

/*
 * Copyright (C) 2014 Freie Universität Berlin
 *
 * This file is subject to the terms and conditions of the GNU Lesser General
 * Public License v2.1. See the file LICENSE in the top level directory for more
 * details.
 */

/**
 * @ingroup     boards_nucleo-l1
 * @{
 *
 * @file
 * @brief       Board specific implementations for the nucleo-l1 board
 *
 * @author      Thomas Eichinger <thomas.eichinger@fu-berlin.de>
 *
 * @}
 */

#include "board.h"
#include "cpu.h"

static void leds_init(void);

void board_init(void)
{
    /* initialize the CPU */
    cpu_init();

    /* initialize the boards LEDs */
    leds_init();
}

/**
 * @brief Initialize the boards on-board LEDs
 *
 * The LED initialization is hard-coded in this function. As the LED is soldered
 * onto the board it is fixed to its CPU pins.
 *
 * The green LED is connected to pin PA5
 */
static void leds_init(void)
{
    /* enable clock for port GPIOE */
    RCC->AHBENR |= RCC_AHBENR_GPIOAEN;

    /* set output speed to 50MHz */
    LED_GREEN_PORT->OSPEEDR |= 0x00000c00;
    /* set output type to push-pull */
    LED_GREEN_PORT->OTYPER &= ~(0x00000020);
    /* configure pins as general outputs */
    LED_GREEN_PORT->MODER &= ~(0x00000c00);
    LED_GREEN_PORT->MODER |= 0x00000400;
    /* disable pull resistors */
    LED_GREEN_PORT->PUPDR &= ~(0x00000c00);

    /* turn all LEDs off */
    LED_GREEN_PORT->BRR = 0x00c0;
}