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- /* Copyright (C) 2012 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>
- #include <avr/io.h>
- #include <util/delay.h>
-
- // Project Includes
- #include <led.h>
- #include <print.h>
-
- // Local Includes
- #include "scan_loop.h"
-
-
-
- // ----- Defines -----
-
- // Pinout Defines
- #define DATA_PORT PORTC
- #define DATA_DDR DDRC
- #define DATA_PIN 7
-
- #define CLOCK_PORT PORTC
- #define CLOCK_DDR DDRC
- #define CLOCK_PIN 6
-
- #define RESET_PORT PORTF
- #define RESET_DDR DDRF
- #define RESET_PIN 7
-
-
- // ----- 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;
- volatile uint8_t KeyIndex_Add_InputSignal; // Used to pass the (click/input value) to the keyboard for the clicker
-
- volatile uint8_t currentWaveState = 0;
-
-
- // Buffer Signals
- volatile uint8_t BufferReadyToClear;
-
-
-
- // ----- Function Declarations -----
-
- void processKeyValue( uint8_t keyValue );
- void removeKeyValue( uint8_t keyValue );
-
-
-
- // ----- Interrupt Functions -----
-
- // Generates a constant external clock
- ISR( TIMER1_COMPA_vect )
- {
- if ( currentWaveState )
- {
- CLOCK_PORT &= ~(1 << CLOCK_PIN);
- currentWaveState--;
- }
- else
- {
- CLOCK_PORT |= (1 << CLOCK_PIN);
- currentWaveState++;
- }
- }
-
-
-
- // ----- Functions -----
-
- // Setup
- inline void scan_setup()
- {
- // Setup Timer Pulse (16 bit)
-
- // TODO Clock can be adjusted to whatever (read chip datasheets for limits)
- // 16 MHz / (2 * Prescaler * (1 + OCR1A)) = 1200.1 baud
- // Prescaler is 1
- // Twice every 1200 baud (actually 1200.1, timer isn't accurate enough)
- // This is close to 820 us, but a bit slower
- cli();
- TCCR1B = 0x09;
- OCR1AH = 0x01;
- OCR1AL = 0x09;
- TIMSK1 = (1 << OCIE1A);
- CLOCK_DDR = (1 << CLOCK_PIN);
- sei();
-
-
- // Initially buffer doesn't need to be cleared (it's empty...)
- BufferReadyToClear = 0;
-
- // InputSignal is off by default
- KeyIndex_Add_InputSignal = 0x00;
-
- // Reset the keyboard before scanning, we might be in a wierd state
- scan_resetKeyboard();
- }
-
-
- // Main Detection Loop
- // Since this function is non-interruptable, we can do checks here on what stage of the
- // output clock we are at (0 or 1)
- // We are looking for a start of packet
- // If detected, all subsequent bits are then logged into a variable
- // Once the end of the packet has been detected (always the same length), decode the pressed keys
- inline uint8_t scan_loop()
- {
- return 0;
- }
-
- void processKeyValue( uint8_t keyValue )
- {
- // Interpret scan code
- switch ( keyValue )
- {
- case 0x00: // Break code from input?
- break;
- default:
- // Make sure the key isn't already in the buffer
- for ( uint8_t c = 0; c < KeyIndex_BufferUsed + 1; c++ )
- {
- // Key isn't in the buffer yet
- if ( c == KeyIndex_BufferUsed )
- {
- bufferAdd( keyValue );
-
- // Only send data if enabled
- if ( KeyIndex_Add_InputSignal )
- scan_sendData( KeyIndex_Add_InputSignal );
- break;
- }
-
- // Key already in the buffer
- if ( KeyIndex_Buffer[c] == keyValue )
- break;
- }
- break;
- }
- }
-
- void removeKeyValue( uint8_t keyValue )
- {
- // Check for the released key, and shift the other keys lower on the buffer
- uint8_t c;
- for ( c = 0; c < KeyIndex_BufferUsed; c++ )
- {
- // Key to release found
- if ( KeyIndex_Buffer[c] == keyValue )
- {
- // Shift keys from c position
- for ( uint8_t k = c; k < KeyIndex_BufferUsed - 1; k++ )
- KeyIndex_Buffer[k] = KeyIndex_Buffer[k + 1];
-
- // Decrement Buffer
- KeyIndex_BufferUsed--;
-
- break;
- }
- }
-
- // Error case (no key to release)
- if ( c == KeyIndex_BufferUsed + 1 )
- {
- errorLED( 1 );
- char tmpStr[6];
- hexToStr( keyValue, tmpStr );
- erro_dPrint( "Could not find key to release: ", tmpStr );
- }
- }
-
- // Send data
- uint8_t scan_sendData( uint8_t dataPayload )
- {
- return 0;
- }
-
- // Signal KeyIndex_Buffer that it has been properly read
- void scan_finishedWithBuffer( void )
- {
- }
-
- // Signal that the keys have been properly sent over USB
- void scan_finishedWithUSBBuffer( void )
- {
- }
-
- // Reset/Hold keyboard
- // NOTE: Does nothing with the BETKB
- void scan_lockKeyboard( void )
- {
- }
-
- // NOTE: Does nothing with the BETKB
- void scan_unlockKeyboard( void )
- {
- }
-
- // Reset Keyboard
- void scan_resetKeyboard( void )
- {
- // TODO Determine the scan period, and the interval to scan each bit
- }
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