1 /* Copyright (C) 2014 by Jacob Alexander
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 #ifndef __MATRIX_SCAN_H
23 #define __MATRIX_SCAN_H
25 // ----- Includes -----
31 // Freescale MK20s have GPIO ports A...E
40 // Each port has a possible 32 pins
85 // Sense/Strobe configuration
87 Config_Pullup, // Internal pull-up
88 Config_Pulldown, // Internal pull-down
89 Config_Opendrain, // External pull resistor
93 typedef enum KeyPosition {
103 // ----- Structs -----
105 // Struct container for defining Rows (Sense) and Columns (Strobes)
106 typedef struct GPIO_Pin {
112 typedef struct KeyState {
113 KeyPosition prevState;
114 KeyPosition curState;
115 uint16_t activeCount;
116 uint16_t inactiveCount;
121 // ----- Functions -----
124 void Matrix_scan( uint16_t scanNum );
127 #endif // __MATRIX_SCAN_H