tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/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 void gpio_init(gpio_t *obj, PinName pin)
  21 {
  22     obj->pin = pin;
  23     if (pin == (PinName)NC) {
  24         return;
  25     }
  26
  27     obj->mask = (1ul << pin);
  28
  29     obj->reg_set = &NRF_GPIO->OUTSET;
  30     obj->reg_clr = &NRF_GPIO->OUTCLR;
  31     obj->reg_in  = &NRF_GPIO->IN;
  32     obj->reg_dir = &NRF_GPIO->DIR;
  33 }
  34
  35 void gpio_mode(gpio_t *obj, PinMode mode)
  36 {
  37     pin_mode(obj->pin, mode);
  38 }
  39
  40 void gpio_dir(gpio_t *obj, PinDirection direction)
  41 {
  42     MBED_ASSERT(obj->pin != (PinName)NC);
  43     switch (direction) {
  44         case PIN_INPUT:
  45             NRF_GPIO->PIN_CNF[obj->pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
  46                                         | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
  47                                         | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
  48                                         | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
  49             break;
  50         case PIN_OUTPUT:
  51             NRF_GPIO->PIN_CNF[obj->pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
  52                                         | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
  53                                         | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
  54                                         | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
  55                                         | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
  56             break;
  57     }
  58 }