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- /* Copyright (C) 2011 by Jacob Alexander
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
- // ----- Includes -----
-
- // AVR Includes
- #include <avr/interrupt.h>
-
- // Project Includes
- #include <led.h>
- #include <print.h>
-
- // Local Includes
- #include "scan_loop.h"
- #include "matrix_scan.h"
-
-
-
- // ----- Defines -----
-
- // Debouncing Defines
- #define SAMPLE_THRESHOLD 110
- #define MAX_SAMPLES 127 // Max is 127, reaching 128 is very bad
-
-
-
- // ----- Macros -----
-
- // Make sure we haven't overflowed the buffer
- #define bufferAdd(byte) \
- if ( KeyIndex_BufferUsed < KEYBOARD_BUFFER ) \
- KeyIndex_Buffer[KeyIndex_BufferUsed++] = byte
-
-
-
- // ----- Variables -----
-
- // Buffer used to inform the macro processing module which keys have been detected as pressed
- volatile uint8_t KeyIndex_Buffer[KEYBOARD_BUFFER];
- volatile uint8_t KeyIndex_BufferUsed;
-
-
- // Keeps track of the number of scans, so we only do a debounce assess when it would be valid (as it throws away data)
- uint8_t scan_count = 0;
-
- // This is where the matrix scan data is held, as well as debouncing is evaluated to, which (depending on the read value) is handled
- // by the macro module
- uint8_t KeyIndex_Array[KEYBOARD_SIZE + 1];
-
-
-
- // ----- Functions -----
-
- // Setup
- inline void scan_setup()
- {
- matrix_pinSetup( (uint8_t*)matrix_pinout, scanMode );
- }
-
- // Main Detection Loop
- inline uint8_t scan_loop()
- {
- // Check count to see if the sample threshold may have been reached, otherwise collect more data
- if ( scan_count < MAX_SAMPLES )
- {
- matrix_scan( (uint8_t*)matrix_pinout, KeyIndex_Array );
-
- // scanDual requires 2 passes, and thus needs more memory per matrix_scan pass
- #if scanMode == scanDual
- scan_count += 2;
- #else
- scan_count++;
- #endif
-
- // Signal Main Detection Loop to continue scanning
- return 0;
- }
-
- // Reset Sample Counter
- scan_count = 0;
-
- // Assess debouncing sample table
- // Loop over all of the sampled keys of the given array
- // If the number of samples is higher than the sample threshold, flag the high bit, clear otherwise
- // This should be resetting VERY quickly, cutting off a potentially valid keypress is not an issue
- for ( uint8_t key = 1; key < KeyIndex_Size + 1; key++ ) if ( ( KeyIndex_Array[key] & ~(1 << 7) ) > SAMPLE_THRESHOLD )
- {
- bufferAdd( key );
- KeyIndex_Array[key] = (1 << 7);
- }
- else
- {
- KeyIndex_Array[key] = 0x00;
- }
-
- // Ready to allow for USB send
- return 1;
- }
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