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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 RESET_PORT PORTB
- #define RESET_DDR DDRD
- #define RESET_PIN 0
-
-
- // ----- 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;
-
-
- // Buffer Signals
- volatile uint8_t BufferReadyToClear;
-
-
-
- // ----- Function Declarations -----
-
- void processKeyValue( uint8_t keyValue );
-
-
-
- // ----- Interrupt Functions -----
-
- // USART Receive Buffer Full Interrupt
- ISR(USART1_RX_vect)
- {
- cli(); // Disable Interrupts
-
- uint8_t keyValue = 0x00;
-
- // The interrupt is always for the first item of the packet set, reset the buffer
- KeyIndex_BufferUsed = 0;
-
- // Only the first 7 bits have scancode data
- // The last packet of the packet set has the 8th bit high, all the others are low
- //
- // Interrupts are too slow for the rest of the packet set, poll for the rest
- while ( 1 )
- {
- // Read the raw packet from the USART
- keyValue = UDR1;
-
- // Debug
- char tmpStr[6];
- hexToStr( keyValue, tmpStr );
- dPrintStrs( tmpStr, " " );
-
- // Process the scancode
- processKeyValue( keyValue );
-
- // Last packet of the set
- if ( keyValue & 0x80 )
- {
- dPrintStrs( "**" );
- break;
- }
-
- // Delay enough so we don't run into the same packet (or the previous buffered packet)
- _delay_us(10000);
- }
-
- sei(); // Re-enable Interrupts
- }
-
-
-
- // ----- Functions -----
-
- // Setup
- inline void scan_setup()
- {
- // Setup the the USART interface for keyboard data input
- // NOTE: The input data signal needs to be inverted for the Teensy USART to properly work
-
- // Setup baud rate
- // 16 MHz / ( 16 * Baud ) = UBRR
- // Baud <- 0.823284 ms per bit, thus 1000 / 0.823284 = 1214.65004 -> 823.2824
- // Thus baud setting = 823
- uint16_t baud = 823; // Max setting of 4095
- UBRR1H = (uint8_t)(baud >> 8);
- UBRR1L = (uint8_t)baud;
-
- // Enable the receiver, transitter, and RX Complete Interrupt as well as 9 bit data
- UCSR1B = 0x9C;
-
- // Set frame format: 9 data, 1 stop bit, no parity
- // Asynchrounous USART mode
- UCSR1C = 0x06;
-
- // Initially buffer doesn't need to be cleared (it's empty...)
- BufferReadyToClear = 0;
-
- // Reset the keyboard before scanning, we might be in a wierd state
- scan_resetKeyboard();
- }
-
-
- // Main Detection Loop
- // Not needed for the BETKB, this is just a busy loop
- inline uint8_t scan_loop()
- {
- return 0;
- }
-
- // TODO
- void processKeyValue( uint8_t keyValue )
- {
- // Finalize output buffer
- // Mask 8th bit
- keyValue &= 0x7F;
-
- // Interpret scan code
- switch ( keyValue )
- {
- case 0x40: // Clear buffer command
- info_print("CLEAR!");
-
- BufferReadyToClear = 1;
- break;
- case 0x7F:
- scan_lockKeyboard();
- _delay_ms(3000);
- scan_unlockKeyboard();
-
- 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 );
- break;
- }
-
- // Key already in the buffer
- if ( KeyIndex_Buffer[c] == keyValue )
- break;
- }
- break;
- }
- }
-
- // Send data
- uint8_t scan_sendData( uint8_t dataPayload )
- {
- UDR1 = dataPayload;
- return 0;
- }
-
- // Signal KeyIndex_Buffer that it has been properly read
- // TODO
- void scan_finishedWithBuffer( void )
- {
- return;
- }
-
- // Signal that the keys have been properly sent over USB
- // TODO
- void scan_finishedWithUSBBuffer( void )
- {
- /*
- uint8_t foundModifiers = 0;
-
- // Look for all of the modifiers present, there is a max of 8 (but only keys for 5 on the HASCI version)
- for ( uint8_t c = 0; c < KeyIndex_BufferUsed; c++ )
- {
- // The modifier range is from 0x80 to 0x8F (well, the last bit is the ON/OFF signal, but whatever...)
- if ( KeyIndex_Buffer[c] <= 0x8F && KeyIndex_Buffer[c] >= 0x80 )
- {
- // Add the modifier back into the the Key Buffer
- KeyIndex_Buffer[foundModifiers] = KeyIndex_Buffer[c];
- foundModifiers++;
- }
- }
-
- // Adjust the size of the new Key Buffer
- KeyIndex_BufferUsed = foundModifiers;
- */
- }
-
- // 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
- // TODO?
- // - Holds the input read line high to flush the buffer
- // - This does not actually reset the keyboard, but always seems brings it to a sane state
- // - Won't work fully if keys are being pressed done at the same time
- void scan_resetKeyboard( void )
- {
- // Initiate data request line, but don't read the incoming data
- //REQUEST_DATA(); TODO
-
- // Not a calculated valued...
- _delay_ms( 50 );
-
- // Stop request line
- //STOP_DATA(); TODO
- }
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