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/* mbed Microcontroller Library
* Copyright (c) 2006-2013 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mbed_assert.h"
#include "gpio_api.h"
#include "pinmap.h"
uint32_t gpio_set(PinName pin) {
MBED_ASSERT(pin != (PinName)NC);
uint32_t port_index = (uint32_t) pin >> 4;
// Enable GPIO peripheral clock
RCC->AHB1ENR |= 1 << port_index;
pin_function(pin, STM_PIN_DATA(0, 0));
return 1 << ((uint32_t) pin & 0xF);
}
void gpio_init(gpio_t *obj, PinName pin) {
obj->pin = pin;
if (pin == (PinName)NC)
return;
obj->mask = gpio_set(pin);
uint32_t port_index = (uint32_t) pin >> 4;
GPIO_TypeDef *port_reg = (GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10));
obj->reg_mode = &port_reg->MODER;
obj->reg_set = &port_reg->BSRRL;
obj->reg_clr = &port_reg->BSRRH;
obj->reg_in = &port_reg->IDR;
}
void gpio_mode(gpio_t *obj, PinMode mode) {
pin_mode(obj->pin, mode);
}
void gpio_dir(gpio_t *obj, PinDirection direction) {
MBED_ASSERT(obj->pin != (PinName)NC);
switch (direction) {
case PIN_INPUT :
pin_function(obj->pin, STM_PIN_DATA(0, 0));
break;
case PIN_OUTPUT:
pin_function(obj->pin, STM_PIN_DATA(1, 0));
break;
}
}
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