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controller/Scan/BETKB/scan_loop.c

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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 -----
// 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 -----
// 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
// 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 )
{
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 );
}