mbed_gpio.c

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  * SPDX-License-Identifier: Apache-2.0
00004  *
00005  * Licensed under the Apache License, Version 2.0 (the "License");
00006  * you may not use this file except in compliance with the License.
00007  * You may obtain a copy of the License at
00008  *
00009  *     http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS,
00013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  */
00017 #include "hal/gpio_api.h"
00018 #include "platform/mbed_toolchain.h"
00019 
00020 static inline void _gpio_init_in(gpio_t *gpio, PinName pin, PinMode mode)
00021 {
00022     gpio_init(gpio, pin);
00023     if (pin != NC) {
00024         gpio_dir(gpio, PIN_INPUT);
00025         gpio_mode(gpio, mode);
00026     }
00027 }
00028 
00029 static inline void _gpio_init_out(gpio_t *gpio, PinName pin, PinMode mode, int value)
00030 {
00031     gpio_init(gpio, pin);
00032     if (pin != NC) {
00033         gpio_write(gpio, value);
00034         gpio_dir(gpio, PIN_OUTPUT);
00035         gpio_mode(gpio, mode);
00036     }
00037 }
00038 
00039 void gpio_init_in(gpio_t *gpio, PinName pin)
00040 {
00041     gpio_init_in_ex(gpio, pin, PullDefault);
00042 }
00043 
00044 void gpio_init_in_ex(gpio_t *gpio, PinName pin, PinMode mode)
00045 {
00046     _gpio_init_in(gpio, pin, mode);
00047 }
00048 
00049 void gpio_init_out(gpio_t *gpio, PinName pin)
00050 {
00051     gpio_init_out_ex(gpio, pin, 0);
00052 }
00053 
00054 void gpio_init_out_ex(gpio_t *gpio, PinName pin, int value)
00055 {
00056     _gpio_init_out(gpio, pin, PullNone, value);
00057 }
00058 
00059 void gpio_init_inout(gpio_t *gpio, PinName pin, PinDirection direction, PinMode mode, int value)
00060 {
00061     if (direction == PIN_INPUT) {
00062         _gpio_init_in(gpio, pin, mode);
00063         if (pin != NC) {
00064             gpio_write(gpio, value);    // we prepare the value in case it is switched later
00065         }
00066     } else {
00067         _gpio_init_out(gpio, pin, mode, value);
00068     }
00069 }
00070 
00071 #ifdef TARGET_FF_ARDUINO
00072 
00073 typedef enum {
00074     DEFAULT_GPIO = 0,
00075 } DefaultGPIOPeripheralName;
00076 
00077 MBED_WEAK const PinMap *gpio_pinmap()
00078 {
00079     // Targets should override this weak implementation to provide correct data.
00080     static const PinMap empty_gpio_pinmap[] = {
00081         {D0, DEFAULT_GPIO, 0},
00082         {D1, DEFAULT_GPIO, 0},
00083         {D2, DEFAULT_GPIO, 0},
00084         {D3, DEFAULT_GPIO, 0},
00085         {D4, DEFAULT_GPIO, 0},
00086         {D5, DEFAULT_GPIO, 0},
00087         {D6, DEFAULT_GPIO, 0},
00088         {D7, DEFAULT_GPIO, 0},
00089         {D8, DEFAULT_GPIO, 0},
00090         {D9, DEFAULT_GPIO, 0},
00091         {D10, DEFAULT_GPIO, 0},
00092         {D11, DEFAULT_GPIO, 0},
00093         {D12, DEFAULT_GPIO, 0},
00094         {D13, DEFAULT_GPIO, 0},
00095         {D14, DEFAULT_GPIO, 0},
00096         {D15, DEFAULT_GPIO, 0},
00097         {A0, DEFAULT_GPIO, 0},
00098         {A1, DEFAULT_GPIO, 0},
00099         {A2, DEFAULT_GPIO, 0},
00100         {A3, DEFAULT_GPIO, 0},
00101         {A4, DEFAULT_GPIO, 0},
00102         {A5, DEFAULT_GPIO, 0},
00103 
00104         {NC, NC, 0},
00105     };
00106     return empty_gpio_pinmap;
00107 }
00108 
00109 #else
00110 
00111 MBED_WEAK const PinMap *gpio_pinmap()
00112 {
00113     static const PinMap empty_gpio_pinmap[] = {
00114         {NC, NC, 0},
00115     };
00116     return empty_gpio_pinmap;
00117 }
00118 
00119 #endif