tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11U6X/gpio_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2014 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
  22 static void gpio_enable(void) {
  23     gpio_enabled = 1;
  24
  25     /* Enable AHB clock to the GPIO and IOCON domain. */
  26     LPC_SYSCON->SYSAHBCLKCTRL |= ((1 << 16) | (1 << 6));
  27 }
  28
  29 uint32_t gpio_set(PinName pin) {
  30     MBED_ASSERT(pin != (PinName)NC);
  31     if (!gpio_enabled)
  32          gpio_enable();
  33
  34     int func = ((pin == P0_0)  || // reset
  35                 (pin == P0_10) || // SWCLK
  36                 (pin == P0_12) || // TMS
  37                 (pin == P0_13) || // TDO
  38                 (pin == P0_14) || // TRST
  39                 (pin == P0_15)) ? (1) : (0); // SWDIO
  40
  41     pin_function(pin, func);
  42
  43     return (1UL << ((int)pin >> PIN_SHIFT & 0x1F));
  44 }
  45
  46 void gpio_init(gpio_t *obj, PinName pin) {
  47     obj->pin = pin;
  48     if (pin == (PinName)NC)
  49         return;
  50
  51     obj->mask = gpio_set(pin);
  52
  53     unsigned int port = (unsigned int)(pin >> PORT_SHIFT);
  54
  55     obj->reg_set = &LPC_GPIO_PORT->SET[port];
  56     obj->reg_clr = &LPC_GPIO_PORT->CLR[port];
  57     obj->reg_in  = &LPC_GPIO_PORT->PIN[port];
  58     obj->reg_dir = &LPC_GPIO_PORT->DIR[port];
  59 }
  60
  61 void gpio_mode(gpio_t *obj, PinMode mode) {
  62     pin_mode(obj->pin, mode);
  63 }
  64
  65 void gpio_dir(gpio_t *obj, PinDirection direction) {
  66     MBED_ASSERT(obj->pin != (PinName)NC);
  67     switch (direction) {
  68         case PIN_INPUT :
  69             *obj->reg_dir &= ~obj->mask;
  70             break;
  71         case PIN_OUTPUT:
  72             *obj->reg_dir |=  obj->mask;
  73             break;
  74     }
  75 }