pinmap.c

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 #include "pinmap.h"
00017 #include "error.h"
00018 
00019 void pin_function(PinName pin, int function) {
00020     if (pin == (uint32_t)NC) return;
00021     
00022     uint32_t pin_number = (uint32_t)pin - (uint32_t)P0_0;
00023     int index = pin_number >> 4;
00024     int offset = (pin_number & 0xF) << 1;
00025     
00026     PINCONARRAY->PINSEL[index] &= ~(0x3 << offset);
00027     PINCONARRAY->PINSEL[index] |= function << offset;
00028 }
00029 
00030 void pin_mode(PinName pin, PinMode mode) {
00031     if (pin == (uint32_t)NC) { return; }
00032     
00033     uint32_t pin_number = (uint32_t)pin - (uint32_t)P0_0;
00034     int index = pin_number >> 5;
00035     int offset = pin_number & 0x1F;
00036     uint32_t drain = ((uint32_t) mode & (uint32_t) OpenDrain) >> 2;
00037     
00038     if (mode == OpenDrain) error("OpenDrain not supported on LPC2368");
00039     
00040     if (!drain) {
00041         index = pin_number >> 4;
00042         offset = (pin_number & 0xF) << 1;
00043         
00044         PINCONARRAY->PINMODE[index] &= ~(0x3 << offset);
00045         PINCONARRAY->PINMODE[index] |= (uint32_t)mode << offset;
00046     }
00047 }