tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F4XX/gpio_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   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
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16 #include "mbed_assert.h"
  17 #include "gpio_api.h"
  18 #include "pinmap.h"
  19
  20 uint32_t gpio_set(PinName pin) {
  21     MBED_ASSERT(pin != (PinName)NC);
  22     uint32_t port_index = (uint32_t) pin >> 4;
  23
  24     // Enable GPIO peripheral clock
  25     RCC->AHB1ENR |= 1 << port_index;
  26
  27     pin_function(pin, STM_PIN_DATA(0, 0));
  28     return 1 << ((uint32_t) pin & 0xF);
  29 }
  30
  31 void gpio_init(gpio_t *obj, PinName pin) {
  32     obj->pin = pin;
  33     if (pin == (PinName)NC)
  34         return;
  35
  36     obj->mask = gpio_set(pin);
  37
  38     uint32_t port_index = (uint32_t) pin >> 4;
  39
  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;
  45 }
  46
  47 void gpio_mode(gpio_t *obj, PinMode mode) {
  48     pin_mode(obj->pin, mode);
  49 }
  50
  51 void gpio_dir(gpio_t *obj, PinDirection direction) {
  52     MBED_ASSERT(obj->pin != (PinName)NC);
  53     switch (direction) {
  54         case PIN_INPUT :
  55             pin_function(obj->pin, STM_PIN_DATA(0, 0));
  56             break;
  57         case PIN_OUTPUT:
  58             pin_function(obj->pin, STM_PIN_DATA(1, 0));
  59             break;
  60     }
  61 }