tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC23XX/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     LPC_SC->SCS |= 1; // High speed GPIO is enabled on ports 0 and 1
  22
  23     pin_function(pin, 0);
  24
  25     return (1 << ((int)pin & 0x1F));
  26 }
  27
  28 void gpio_init(gpio_t *obj, PinName pin) {
  29     if (pin == (PinName)NC)
  30         return;
  31     obj->pin = pin;
  32     obj->mask = gpio_set(pin);
  33
  34     LPC_GPIO_TypeDef *port_reg = (LPC_GPIO_TypeDef *) ((int)pin & ~0x1F);
  35
  36     obj->reg_set = &port_reg->FIOSET;
  37     obj->reg_clr = &port_reg->FIOCLR;
  38     obj->reg_in  = &port_reg->FIOPIN;
  39     obj->reg_dir = &port_reg->FIODIR;
  40 }
  41
  42 void gpio_mode(gpio_t *obj, PinMode mode) {
  43     pin_mode(obj->pin, mode);
  44 }
  45
  46 void gpio_dir(gpio_t *obj, PinDirection direction) {
  47     if (obj->pin == (PinName)NC)
  48         return;
  49     switch (direction) {
  50         case PIN_INPUT : *obj->reg_dir &= ~obj->mask; break;
  51         case PIN_OUTPUT: *obj->reg_dir |=  obj->mask; break;
  52     }
  53 }