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- /* Copyright (C) 2012,2014 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 -----
-
- // Compiler Includes
- #include <Lib/ScanLib.h>
-
- // Project Includes
- #include <led.h>
- #include <print.h>
-
- // Local Includes
- #include "scan_loop.h"
-
-
-
- // ----- Defines -----
-
- // Pinout Defines
- #define HOLD_PORT PORTD
- #define HOLD_DDR DDRD
- #define HOLD_PIN 3
-
-
- // ----- Macros -----
-
-
-
- // ----- 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
-
-
- // Buffer Signals
- volatile uint8_t BufferReadyToClear;
-
-
-
- // ----- Function Declarations -----
-
- void processKeyValue( uint8_t keyValue );
- void removeKeyValue( uint8_t keyValue );
-
-
-
- // ----- Interrupt Functions -----
-
- // USART Receive Buffer Full Interrupt
- ISR(USART1_RX_vect)
- {
- cli(); // Disable Interrupts
-
- uint8_t keyValue = 0x00;
- uint8_t keyState = 0x00;
-
- // Read the scancode packet from the USART (1st to 8th bits)
- keyValue = UDR1;
-
- // Read the release/press bit (9th bit) XXX Unnecessary, and wrong it seems, parity bit? or something else?
- keyState = UCSR1B & 0x02;
-
- // High bit of keyValue, also represents press/release
- keyState = keyValue & 0x80 ? 0x00 : 0x02;
-
- // Debug
- char tmpStr[6];
- hexToStr( keyValue & 0x7F, tmpStr );
-
- // Process the scancode
- switch ( keyState )
- {
- case 0x00: // Released
- dPrintStrs( tmpStr, "R " ); // Debug
-
- // Remove key from press buffer
- removeKeyValue( keyValue & 0x7F );
- break;
-
- case 0x02: // Pressed
- dPrintStrs( tmpStr, "P " ); // Debug
-
- // New key to process
- processKeyValue( keyValue & 0x7F );
- break;
- }
-
- 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, and RX Complete Interrupt as well as 9 bit data
- UCSR1B = 0x94;
-
- // The transmitter is only to be enabled when needed
- // Set the pin to be pull-up otherwise (use the lowered voltage inverter in order to sink)
- HOLD_DDR &= ~(1 << HOLD_PIN);
- HOLD_PORT |= (1 << HOLD_PIN);
-
- // 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;
-
- // 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
- // Not needed for the BETKB, this is just a busy loop
- 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 )
- {
- Macro_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 )
- {
- // Enable the USART Transmitter
- UCSR1B |= (1 << 3);
-
- // Debug
- char tmpStr[6];
- hexToStr( dataPayload, tmpStr );
- info_dPrint( "Sending - ", tmpStr );
-
- UDR1 = dataPayload;
-
- // Wait for the payload
- _delay_us( 800 );
-
- // Disable the USART Transmitter
- UCSR1B &= ~(1 << 3);
-
- return 0;
- }
-
- // Signal KeyIndex_Buffer that it has been properly read
- void Scan_finishedWithBuffer( uint8_t sentKeys )
- {
- }
-
- // Signal that the keys have been properly sent over USB
- void Scan_finishedWithUSBBuffer( uint8_t sentKeys )
- {
- }
-
- // 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 )
- {
- // Not a calculated valued...
- _delay_ms( 50 );
- }
-
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