tmk_core/tool/mbed/mbed-sdk/libraries/mbed/common/gpio.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 "gpio_api.h"
  17
  18 static inline void _gpio_init_in(gpio_t* gpio, PinName pin, PinMode mode)
  19 {
  20     gpio_init(gpio, pin);
  21     if (pin != NC) {
  22         gpio_dir(gpio, PIN_INPUT);
  23         gpio_mode(gpio, mode);
  24     }
  25 }
  26
  27 static inline void _gpio_init_out(gpio_t* gpio, PinName pin, PinMode mode, int value)
  28 {
  29     gpio_init(gpio, pin);
  30     if (pin != NC) {
  31         gpio_write(gpio, value);
  32         gpio_dir(gpio, PIN_OUTPUT);
  33         gpio_mode(gpio, mode);
  34     }
  35 }
  36
  37 void gpio_init_in(gpio_t* gpio, PinName pin) {
  38     gpio_init_in_ex(gpio, pin, PullDefault);
  39 }
  40
  41 void gpio_init_in_ex(gpio_t* gpio, PinName pin, PinMode mode) {
  42     _gpio_init_in(gpio, pin, mode);
  43 }
  44
  45 void gpio_init_out(gpio_t* gpio, PinName pin) {
  46     gpio_init_out_ex(gpio, pin, 0);
  47 }
  48
  49 void gpio_init_out_ex(gpio_t* gpio, PinName pin, int value) {
  50     _gpio_init_out(gpio, pin, PullNone, value);
  51 }
  52
  53 void gpio_init_inout(gpio_t* gpio, PinName pin, PinDirection direction, PinMode mode, int value) {
  54     if (direction == PIN_INPUT) {
  55         _gpio_init_in(gpio, pin, mode);
  56         if (pin != NC)
  57             gpio_write(gpio, value); // we prepare the value in case it is switched later
  58     } else {
  59         _gpio_init_out(gpio, pin, mode, value);
  60     }
  61 }