tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC23XX/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
  23     uint32_t pin_number = (uint32_t)pin - (uint32_t)P0_0;
  24     int index = pin_number >> 4;
  25     int offset = (pin_number & 0xF) << 1;
  26
  27     PINCONARRAY->PINSEL[index] &= ~(0x3 << offset);
  28     PINCONARRAY->PINSEL[index] |= function << offset;
  29 }
  30
  31 void pin_mode(PinName pin, PinMode mode) {
  32     MBED_ASSERT((pin != (PinName)NC) && (mode != OpenDrain));
  33
  34     uint32_t pin_number = (uint32_t)pin - (uint32_t)P0_0;
  35     int index = pin_number >> 5;
  36     int offset = pin_number & 0x1F;
  37     uint32_t drain = ((uint32_t) mode & (uint32_t) OpenDrain) >> 2;
  38
  39     if (!drain) {
  40         index = pin_number >> 4;
  41         offset = (pin_number & 0xF) << 1;
  42
  43         PINCONARRAY->PINMODE[index] &= ~(0x3 << offset);
  44         PINCONARRAY->PINMODE[index] |= (uint32_t)mode << offset;
  45     }
  46 }