board.c
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/*
* 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_msbiot
* @{
*
* @file
* @brief Board specific implementations for the MSB-IoT board
*
* @author Fabian Nack <nack@inf.fu-berlin.de>
*
* @}
*/
#include "board.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 standard LEDs (RED, YELLOW, GREEN)
*
* The LED initialization is hard-coded in this function. As the LEDs are soldered
* onto the board they are fixed to their CPU pins.
*
* The LEDs are connected to the following pins:
* - LED RED: PB8
* - LED YELLOW: PB14
* - LED GREEN: PB15
*/
static void leds_init(void)
{
/* enable clock for port GPIOB */
periph_clk_en(AHB1, RCC_AHB1ENR_GPIOBEN);
/* set output speed to 50MHz */
LED_PORT->OSPEEDR &= ~(0xF0030000);
LED_PORT->OSPEEDR |= 0xA0020000;
/* set output type to push-pull */
LED_PORT->OTYPER &= ~(0x0000C100);
/* configure pins as general outputs */
LED_PORT->MODER &= ~(0xF0030000);
LED_PORT->MODER |= 0x50010000;
/* disable pull resistors */
LED_PORT->PUPDR &= ~(0xF0030000);
/* turn all LEDs off */
LED_PORT->BSRRL = 0xC100;
}