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controller/Scan/matrix/scan_loop.c

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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 -----
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// Make sure we haven't overflowed the buffer
#define bufferAdd(byte) \
if ( KeyIndex_BufferUsed < KEYBOARD_BUFFER ) \
KeyIndex_Buffer[KeyIndex_BufferUsed++] = byte
// ----- Variables -----
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// 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()
{
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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
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// 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;
}