1 /* mbed Microcontroller Library
2 * Copyright (c) 2006-2013 ARM Limited
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 #include "mbed_assert.h"
20 uint32_t gpio_set(PinName pin) {
21 MBED_ASSERT(pin != (PinName)NC);
22 uint32_t port_index = (uint32_t) pin >> 4;
24 // Enable GPIO peripheral clock
25 RCC->AHB1ENR |= 1 << port_index;
27 pin_function(pin, STM_PIN_DATA(0, 0));
28 return 1 << ((uint32_t) pin & 0xF);
31 void gpio_init(gpio_t *obj, PinName pin) {
33 if (pin == (PinName)NC)
36 obj->mask = gpio_set(pin);
38 uint32_t port_index = (uint32_t) pin >> 4;
40 GPIO_TypeDef *port_reg = (GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10));
41 obj->reg_mode = &port_reg->MODER;
42 obj->reg_set = &port_reg->BSRRL;
43 obj->reg_clr = &port_reg->BSRRH;
44 obj->reg_in = &port_reg->IDR;
47 void gpio_mode(gpio_t *obj, PinMode mode) {
48 pin_mode(obj->pin, mode);
51 void gpio_dir(gpio_t *obj, PinDirection direction) {
52 MBED_ASSERT(obj->pin != (PinName)NC);
55 pin_function(obj->pin, STM_PIN_DATA(0, 0));
58 pin_function(obj->pin, STM_PIN_DATA(1, 0));