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 port_n = (uint32_t)pin >> PORT_SHIFT;
00023     uint32_t pin_n  = (uint32_t)(pin & 0x7C) >> 2;
00024 
00025     SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port_n);
00026     __IO uint32_t* pin_pcr = &(((PORT_Type *)(PORTA_BASE + 0x1000 * port_n)))->PCR[pin_n];
00027 
00028     // pin mux bits: [10:8] -> 11100000000 = (0x700)
00029     *pin_pcr = (*pin_pcr & ~0x700) | (function << 8);
00030 }
00031 
00032 void pin_mode(PinName pin, PinMode mode) {
00033     if (pin == (uint32_t)NC) { return; }
00034 
00035     __IO uint32_t* pin_pcr = (__IO uint32_t*)(PORTA_BASE + pin);
00036 
00037     // pin pullup bits: [1:0] -> 11 = (0x3)
00038     *pin_pcr = (*pin_pcr & ~0x3) | mode;
00039 }