tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/port_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2013 Nordic Semiconductor
   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 "port_api.h"
  17 #include "pinmap.h"
  18 #include "gpio_api.h"
  19
  20 PinName port_pin(PortName port, int pin_n)
  21 {
  22     return (PinName)(pin_n);
  23 }
  24
  25 void port_init(port_t *obj, PortName port, int mask, PinDirection dir)
  26 {
  27     obj->port = port;
  28     obj->mask = mask;
  29
  30     obj->reg_out = &NRF_GPIO->OUT;
  31     obj->reg_in  = &NRF_GPIO->IN;
  32     obj->reg_cnf = NRF_GPIO->PIN_CNF;
  33
  34     port_dir(obj, dir);
  35 }
  36
  37 void port_mode(port_t *obj, PinMode mode)
  38 {
  39     uint32_t i;
  40     // The mode is set per pin: reuse pinmap logic
  41     for (i = 0; i<31; i++) {
  42         if (obj->mask & (1 << i)) {
  43             pin_mode(port_pin(obj->port, i), mode);
  44         }
  45     }
  46 }
  47
  48 void port_dir(port_t *obj, PinDirection dir)
  49 {
  50     int i;
  51     switch (dir) {
  52     case PIN_INPUT:
  53         for (i = 0; i<31; i++) {
  54             if (obj->mask & (1 << i)) {
  55                 obj->reg_cnf[i] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
  56                                     | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
  57                                     | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
  58                                     | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
  59             }
  60         }
  61         break;
  62     case PIN_OUTPUT:
  63         for (i = 0; i<31; i++) {
  64             if (obj->mask & (1 << i)) {
  65                 obj->reg_cnf[i] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
  66                                     | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
  67                                     | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
  68                                     | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
  69                                     | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
  70             }
  71         }
  72         break;
  73     }
  74 }
  75
  76 void port_write(port_t *obj, int value)
  77 {
  78     *obj->reg_out = value;
  79 }
  80
  81 int port_read(port_t *obj)
  82 {
  83     return (*obj->reg_in);
  84 }