tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC81X/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 static int  gpio_enabled = 0;
  21 static void gpio_enable(void) {
  22     gpio_enabled = 1;
  23
  24     /* Enable AHB clock to the GPIO domain. */
  25     LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);
  26
  27     /* Peripheral reset control to GPIO and GPIO INT, a "1" bring it out of reset. */
  28     LPC_SYSCON->PRESETCTRL &= ~(0x1<<10);
  29     LPC_SYSCON->PRESETCTRL |=  (0x1<<10);
  30 }
  31
  32 uint32_t gpio_set(PinName pin) {
  33     int f = 0;
  34
  35     if (!gpio_enabled)
  36          gpio_enable();
  37
  38     pin_function(pin, f);
  39
  40     return (1 << ((int)pin & 0x1F));
  41 }
  42
  43 void gpio_init(gpio_t *obj, PinName pin) {
  44     obj->pin = pin;
  45     if (pin == (PinName)NC)
  46         return;
  47
  48     obj->mask = gpio_set(pin);
  49
  50     obj->reg_set = &LPC_GPIO_PORT->SET0;
  51     obj->reg_clr = &LPC_GPIO_PORT->CLR0;
  52     obj->reg_in  = &LPC_GPIO_PORT->PIN0;
  53     obj->reg_dir = &LPC_GPIO_PORT->DIR0;
  54 }
  55
  56 void gpio_mode(gpio_t *obj, PinMode mode) {
  57     pin_mode(obj->pin, mode);
  58 }
  59
  60 void gpio_dir(gpio_t *obj, PinDirection direction) {
  61     MBED_ASSERT(obj->pin != (PinName)NC);
  62     switch (direction) {
  63         case PIN_INPUT :
  64             *obj->reg_dir &= ~obj->mask;
  65             break;
  66         case PIN_OUTPUT:
  67             *obj->reg_dir |= obj->mask;
  68             break;
  69     }
  70 }