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64 lines
1.4 KiB
C
64 lines
1.4 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 boards_msbiot
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* @{
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*
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* @file
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* @brief Board specific implementations for the MSB-IoT board
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*
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* @author Fabian Nack <nack@inf.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 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 standard LEDs (RED, YELLOW, GREEN)
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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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* - LED RED: PB8
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* - LED YELLOW: PB14
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* - LED GREEN: PB15
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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 GPIOB */
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RCC->AHB1ENR |= RCC_AHB1ENR_GPIOBEN;
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/* set output speed to 50MHz */
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LED_PORT->OSPEEDR &= ~(0xF0030000);
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LED_PORT->OSPEEDR |= 0xA0020000;
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/* set output type to push-pull */
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LED_PORT->OTYPER &= ~(0x0000C100);
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/* configure pins as general outputs */
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LED_PORT->MODER &= ~(0xF0030000);
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LED_PORT->MODER |= 0x50010000;
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/* disable pull resistors */
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LED_PORT->PUPDR &= ~(0xF0030000);
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/* turn all LEDs off */
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LED_PORT->BSRRL = 0xC100;
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}
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