tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/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 void pin_function(PinName pin, int function) {
  21     MBED_ASSERT(pin != (PinName)NC);
  22     uint32_t offset = (uint32_t)pin & 0xff;
  23     __IO uint32_t *reg = (__IO uint32_t*)(LPC_IOCON_BASE + offset);
  24
  25     // pin function bits: [2:0] -> 111 = (0x7)
  26     *reg = (*reg & ~0x7) | (function & 0x7);
  27 }
  28
  29 void pin_mode(PinName pin, PinMode mode) {
  30     MBED_ASSERT(pin != (PinName)NC);
  31     uint32_t offset = (uint32_t)pin & 0xff;
  32     uint32_t drain = ((uint32_t)mode & (uint32_t)OpenDrain) >> 2;
  33
  34     __IO uint32_t *reg = (__IO uint32_t*)(LPC_IOCON_BASE + offset);
  35     uint32_t tmp = *reg;
  36
  37     // pin mode bits: [4:3] -> 11000 = (0x3 << 3)
  38     tmp &= ~(0x3 << 3);
  39     tmp |= (mode & 0x3) << 3;
  40
  41     // drain
  42     tmp &= ~(0x1 << 10);
  43     tmp |= drain << 10;
  44
  45     *reg = tmp;
  46 }