tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/port_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
  17 #include "port_api.h"
  18 #include "pinmap.h"
  19 #include "gpio_api.h"
  20
  21 // LPC114 IOCON offset table [port][pin]
  22
  23 static uint8_t iocon_offset[4][12] = {
  24     {0x0c,0x10,0x1c,0x2c,0x30,0x34,0x4c,0x50,0x60,0x64,0x68,0x74}, // PORT 0
  25     {0x78,0x7c,0x80,0x90,0x94,0xa0,0xa4,0xa8,0x14,0x38,0x6c,0x98}, // PORT 1
  26     {0x08,0x28,0x5c,0x8c,0x40,0x44,0x00,0x20,0x24,0x54,0x58,0x70}, // PORT 2
  27     {0x84,0x88,0x9c,0xac,0x3c,0x48}                                // PORT 3
  28 };
  29
  30 PinName port_pin(PortName port, int pin) {
  31     return (PinName)((port << PORT_SHIFT) | (pin << PIN_SHIFT) | (uint32_t)iocon_offset[port][pin]);
  32 }
  33
  34 void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
  35     obj->port = port;
  36     obj->mask = mask;
  37
  38     LPC_GPIO_TypeDef *port_reg = ((LPC_GPIO_TypeDef *) (LPC_GPIO0_BASE + (port * 0x10000)));
  39
  40     obj->reg_data  = &port_reg->DATA;
  41     obj->reg_dir = &port_reg->DIR;
  42
  43     uint32_t i;
  44     // The function is set per pin: reuse gpio logic
  45     for (i=0; i<12; i++) {
  46         if (obj->mask & (1<<i)) {
  47             gpio_set(port_pin(obj->port, i));
  48         }
  49     }
  50
  51     port_dir(obj, dir);
  52 }
  53
  54 void port_mode(port_t *obj, PinMode mode) {
  55     uint32_t i;
  56     // The mode is set per pin: reuse pinmap logic
  57     for (i=0; i<12; i++) {
  58         if (obj->mask & (1<<i)) {
  59             pin_mode(port_pin(obj->port, i), mode);
  60         }
  61     }
  62 }
  63
  64 void port_dir(port_t *obj, PinDirection dir) {
  65     switch (dir) {
  66         case PIN_INPUT : *obj->reg_dir &= ~obj->mask; break;
  67         case PIN_OUTPUT: *obj->reg_dir |=  obj->mask; break;
  68     }
  69 }
  70
  71 void port_write(port_t *obj, int value) {
  72     *obj->reg_data = (value & obj->mask);
  73 }
  74
  75 int port_read(port_t *obj) {
  76     return (*obj->reg_data & obj->mask);
  77 }
  78