gpio_object.h

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00020  * SOFTWARE.
00021  */
00022 #ifndef MBED_GPIO_OBJECT_H
00023 #define MBED_GPIO_OBJECT_H
00024 
00025 #ifdef __cplusplus
00026 extern "C" {
00027 #endif
00028 
00029 typedef struct {
00030     PinName  pin;
00031     uint32_t mask;
00032 
00033     __IO uint32_t *reg_dir;
00034     __IO uint32_t *reg_set;
00035     __IO uint32_t *reg_clr;
00036     __I  uint32_t *reg_in;
00037 } gpio_t;
00038 
00039 static inline void gpio_write(gpio_t *obj, int value) {
00040     if (value)
00041         *obj->reg_set = obj->mask;
00042     else
00043         *obj->reg_clr = obj->mask;
00044 }
00045 
00046 static inline int gpio_read(gpio_t *obj) {
00047     return ((*obj->reg_in & obj->mask) ? 1 : 0);
00048 }
00049 
00050 #ifdef __cplusplus
00051 }
00052 #endif
00053 
00054 #endif
00055