mbed/src/capi/pinmap_common.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 "pinmap.h"
  17 #include "error.h"
  18
  19 void pinmap_pinout(PinName pin, const PinMap *map) {
  20     if (pin == NC) return;
  21
  22     while (map->pin != NC) {
  23         if (map->pin == pin) {
  24             pin_function(pin, map->function);
  25             pin_mode(pin, PullNone);
  26             return;
  27         }
  28         map++;
  29     }
  30     error("could not pinout");
  31 }
  32
  33 uint32_t pinmap_merge(uint32_t a, uint32_t b) {
  34     // both are the same (inc both NC)
  35     if (a == b) return a;
  36
  37     // one (or both) is not connected
  38     if (a == (uint32_t)NC) return b;
  39     if (b == (uint32_t)NC) return a;
  40
  41     // mis-match error case
  42     error("pinmap mis-match");
  43     return (uint32_t)NC;
  44 }
  45
  46 uint32_t pinmap_peripheral(PinName pin, const PinMap* map) {
  47     if (pin == (uint32_t)NC)
  48         return (uint32_t)NC;
  49
  50     while (map->pin != NC) {
  51         if (map->pin == pin)
  52             return map->peripheral;
  53         map++;
  54     }
  55
  56     // no mapping available
  57     error("pinmap not found for peripheral");
  58     return (uint32_t)NC;
  59 }