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/* *****************************************************************************
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Created: 12/18/09 02:35:49
* Copyright (c) 2009 Perry L. Hung. All rights reserved.
*
* ****************************************************************************/
/**
* @file gpio.c
*
* @brief GPIO initialization routine
*/
#include "libmaple.h"
#include "stm32f10x_rcc.h"
#include "gpio.h"
void gpio_init(void) {
/* Turn on clocks for GPIO */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |
RCC_APB2Periph_GPIOB |
RCC_APB2Periph_GPIOC |
RCC_APB2Periph_AFIO,
ENABLE);
}
void gpio_set_mode(GPIO_Port* port, uint8 gpio_pin, uint8 mode) {
uint32_t tmp;
uint32_t shift = POS(gpio_pin % 8);
GPIOReg CR;
ASSERT(port);
ASSERT(gpio_pin < 16);
CR = (gpio_pin < 8) ? &(port->CRL) : &(port->CRH);
tmp = *CR;
tmp &= POS_MASK(shift);
tmp |= mode << shift;
*CR = tmp;
}
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