pinmap_common.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 pinmap_pinout(PinName pin, const PinMap *map) {
00020     if (pin == NC) return;
00021 
00022     while (map->pin != NC) {
00023         if (map->pin == pin) {
00024             pin_function(pin, map->function);
00025             
00026             pin_mode(pin, PullNone);
00027             return;
00028         }
00029         map++;
00030     }
00031     error("could not pinout");
00032 }
00033 
00034 uint32_t pinmap_merge(uint32_t a, uint32_t b) {
00035     // both are the same (inc both NC)
00036     if (a == b) return a;
00037 
00038     // one (or both) is not connected
00039     if (a == (uint32_t)NC) return b;
00040     if (b == (uint32_t)NC) return a;
00041 
00042     // mis-match error case
00043     error("pinmap mis-match");
00044     return (uint32_t)NC;
00045 }
00046 
00047 uint32_t pinmap_find_peripheral(PinName pin, const PinMap* map) {
00048     while (map->pin != NC) {
00049         if (map->pin == pin)
00050             return map->peripheral;
00051         map++;
00052     }
00053     return (uint32_t)NC;
00054 }
00055 
00056 uint32_t pinmap_peripheral(PinName pin, const PinMap* map) {
00057     uint32_t peripheral = (uint32_t)NC;
00058 
00059     if (pin == (PinName)NC)
00060         return (uint32_t)NC;
00061     peripheral = pinmap_find_peripheral(pin, map);
00062     if ((uint32_t)NC == peripheral) // no mapping available
00063         error("pinmap not found for peripheral");
00064     return peripheral;
00065 }