tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11UXX/pinmap.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 "pinmap.h"
  18 #include "mbed_error.h"
  19
  20 #define LPC_IOCON0_BASE (LPC_IOCON_BASE)
  21 #define LPC_IOCON1_BASE (LPC_IOCON_BASE + 0x60)
  22
  23 void pin_function(PinName pin, int function) {
  24     MBED_ASSERT(pin != (PinName)NC);
  25     if (pin == (PinName)NC) return;
  26
  27     uint32_t pin_number = (uint32_t)pin;
  28
  29     __IO uint32_t *reg = (pin_number < 32) ?
  30                          (__IO uint32_t*)(LPC_IOCON0_BASE + 4 * pin_number) :
  31                          (__IO uint32_t*)(LPC_IOCON1_BASE + 4 * (pin_number - 32));
  32
  33     // pin function bits: [2:0] -> 111 = (0x7)
  34     *reg = (*reg & ~0x7) | (function & 0x7);
  35 }
  36
  37 void pin_mode(PinName pin, PinMode mode) {
  38     MBED_ASSERT(pin != (PinName)NC);
  39     uint32_t pin_number = (uint32_t)pin;
  40     uint32_t drain = ((uint32_t) mode & (uint32_t) OpenDrain) >> 2;
  41
  42     __IO uint32_t *reg = (pin_number < 32) ?
  43                          (__IO uint32_t*)(LPC_IOCON0_BASE + 4 * pin_number) :
  44                          (__IO uint32_t*)(LPC_IOCON1_BASE + 4 * (pin_number - 32));
  45     uint32_t tmp = *reg;
  46
  47     // pin mode bits: [4:3] -> 11000 = (0x3 << 3)
  48     tmp &= ~(0x3 << 3);
  49     tmp |= (mode & 0x3) << 3;
  50
  51     // drain
  52     tmp &= ~(0x1 << 10);
  53     tmp |= drain << 10;
  54
  55     *reg = tmp;
  56 }