tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20XX/port_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2015 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 "port_api.h"
  17 #include "pinmap.h"
  18 #include "gpio_api.h"
  19
  20 PinName port_pin(PortName port, int pin_n) {
  21     return (PinName)((port << PORT_SHIFT) | (pin_n << 2));
  22 }
  23
  24 void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
  25     obj->port = port;
  26     obj->mask = mask;
  27
  28     GPIO_Type *reg = (GPIO_Type *)(PTA_BASE + port * 0x40);
  29
  30     obj->reg_out = &reg->PDOR;
  31     obj->reg_in  = &reg->PDIR;
  32     obj->reg_dir = &reg->PDDR;
  33
  34     uint32_t i;
  35     // The function is set per pin: reuse gpio logic
  36     for (i=0; i<32; i++) {
  37         if (obj->mask & (1<<i)) {
  38             gpio_set(port_pin(obj->port, i));
  39         }
  40     }
  41
  42     port_dir(obj, dir);
  43 }
  44
  45 void port_mode(port_t *obj, PinMode mode) {
  46     uint32_t i;
  47     // The mode is set per pin: reuse pinmap logic
  48     for (i=0; i<32; i++) {
  49         if (obj->mask & (1<<i)) {
  50             pin_mode(port_pin(obj->port, i), mode);
  51         }
  52     }
  53 }
  54
  55 void port_dir(port_t *obj, PinDirection dir) {
  56     switch (dir) {
  57         case PIN_INPUT :
  58             *obj->reg_dir &= ~obj->mask;
  59             break;
  60         case PIN_OUTPUT:
  61             *obj->reg_dir |=  obj->mask;
  62             break;
  63     }
  64 }
  65
  66 void port_write(port_t *obj, int value) {
  67     *obj->reg_out = (*obj->reg_in & ~obj->mask) | (value & obj->mask);
  68 }
  69
  70 int port_read(port_t *obj) {
  71     return (*obj->reg_in & obj->mask);
  72 }