tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC13XX/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     int f = ((pin == P0_11) || (pin == P0_12) ||
  23              (pin == P0_13) || (pin == P0_14)) ? (1) : (0);
  24     pin_function(pin, f);
  25
  26     return (1 << ((int)pin & 0x1F));
  27 }
  28
  29 void gpio_init(gpio_t *obj, PinName pin) {
  30     obj->pin = pin;
  31     if (pin == (PinName)NC)
  32         return;
  33
  34     obj->mask = gpio_set(pin);
  35
  36     unsigned int port = (unsigned int)pin >> PORT_SHIFT;
  37
  38     obj->reg_set = &LPC_GPIO->SET[port];
  39     obj->reg_clr = &LPC_GPIO->CLR[port];
  40     obj->reg_in  = &LPC_GPIO->PIN[port];
  41     obj->reg_dir = &LPC_GPIO->DIR[port];
  42 }
  43
  44 void gpio_mode(gpio_t *obj, PinMode mode) {
  45     pin_mode(obj->pin, mode);
  46 }
  47
  48 void gpio_dir(gpio_t *obj, PinDirection direction) {
  49     MBED_ASSERT(obj->pin != (PinName)NC);
  50     switch (direction) {
  51         case PIN_INPUT :
  52             *obj->reg_dir &= ~obj->mask;
  53             break;
  54         case PIN_OUTPUT:
  55             *obj->reg_dir |= obj->mask;
  56             break;
  57     }
  58 }