tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F3/gpio_api.c

   1 /* mbed Microcontroller Library
   2  *******************************************************************************
   3  * Copyright (c) 2014, STMicroelectronics
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright notice,
  12  *    this list of conditions and the following disclaimer in the documentation
  13  *    and/or other materials provided with the distribution.
  14  * 3. Neither the name of STMicroelectronics nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *******************************************************************************
  29  */
  30 #include "mbed_assert.h"
  31 #include "gpio_api.h"
  32 #include "pinmap.h"
  33 #include "mbed_error.h"
  34
  35 extern uint32_t Set_GPIO_Clock(uint32_t port_idx);
  36
  37 uint32_t gpio_set(PinName pin)
  38 {
  39     MBED_ASSERT(pin != (PinName)NC);
  40
  41     pin_function(pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
  42
  43     return (uint32_t)(1 << ((uint32_t)pin & 0xF)); // Return the pin mask
  44 }
  45
  46 void gpio_init(gpio_t *obj, PinName pin)
  47 {
  48     obj->pin = pin;
  49     if (pin == (PinName)NC) {
  50         return;
  51     }
  52
  53     uint32_t port_index = STM_PORT(pin);
  54
  55     // Enable GPIO clock
  56     uint32_t gpio_add = Set_GPIO_Clock(port_index);
  57     GPIO_TypeDef *gpio = (GPIO_TypeDef *)gpio_add;
  58
  59     // Fill GPIO object structure for future use
  60     obj->mask    = gpio_set(pin);
  61     obj->reg_in  = &gpio->IDR;
  62     obj->reg_set = &gpio->BSRRL;
  63     obj->reg_clr = &gpio->BSRRH;
  64 }
  65
  66 void gpio_mode(gpio_t *obj, PinMode mode)
  67 {
  68     pin_mode(obj->pin, mode);
  69 }
  70
  71 void gpio_dir(gpio_t *obj, PinDirection direction)
  72 {
  73     MBED_ASSERT(obj->pin != (PinName)NC);
  74     if (direction == PIN_OUTPUT) {
  75         pin_function(obj->pin, STM_PIN_DATA(STM_MODE_OUTPUT_PP, GPIO_NOPULL, 0));
  76     } else { // PIN_INPUT
  77         pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
  78     }
  79 }