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