tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/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  * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
  17  */
  18 #include "mbed_assert.h"
  19 #include "gpio_api.h"
  20 #include "pinmap.h"
  21
  22 uint32_t gpio_set(PinName pin) {
  23     MBED_ASSERT(pin != (PinName)NC);
  24     int f = 0;
  25     unsigned int port = (unsigned int)MBED_GPIO_PORT(pin);
  26
  27     f = SCU_PINIO_FAST | ((port > 4) ? (4) : (0));
  28     pin_function(pin, f);
  29
  30     return (1 << ((int)pin & 0x1F));
  31 }
  32
  33 void gpio_init(gpio_t *obj, PinName pin) {
  34     obj->pin = pin;
  35     if (pin == (PinName)NC)
  36         return;
  37
  38     obj->mask = gpio_set(pin);
  39
  40     LPC_GPIO_T *port_reg = (LPC_GPIO_T *)(LPC_GPIO_PORT_BASE);
  41     unsigned int port = (unsigned int)MBED_GPIO_PORT(pin);
  42
  43     obj->reg_set = &port_reg->SET[port];
  44     obj->reg_clr = &port_reg->CLR[port];
  45     obj->reg_in  = &port_reg->PIN[port];
  46     obj->reg_dir = &port_reg->DIR[port];
  47 }
  48
  49 void gpio_mode(gpio_t *obj, PinMode mode) {
  50     pin_mode(obj->pin, mode);
  51 }
  52
  53 void gpio_dir(gpio_t *obj, PinDirection direction) {
  54     MBED_ASSERT(obj->pin != (PinName)NC);
  55     switch (direction) {
  56         case PIN_INPUT :
  57             *obj->reg_dir &= ~obj->mask;
  58             break;
  59         case PIN_OUTPUT:
  60             *obj->reg_dir |= obj->mask;
  61             break;
  62     }
  63 }