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controller/Scan/SonyNEWS/scan_loop.c

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/* Copyright (C) 2011 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 SPKR_PORT PORTD
#define SPKR_DDR DDRD
#define SPKR_POS 1
#define POWR_PORT PORTC
#define POWR_DDR DDRC
#define POWR_POS 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;
// ----- Functions -----
// Setup
inline void scan_setup()
{
// Setup the the USART interface for keyboard data input
// Setup baud rate
// 16 MHz / ( 16 * Baud ) = UBRR
// Baud <- 0.10450 ms per bit, thus 1000 / 0.10450 = 9569.4
// Thus UBRR = 104.50
// To deal with the 0.5, setting to double speed, which means UBRR = 209
uint16_t baud = 209; // Max setting of 4095
UBRR1H = (uint8_t)(baud >> 8);
UBRR1L = (uint8_t)baud;
// Enable Double Read Speed
UCSR1A = 0x02;
// Enable the receiver, transitter, and RX Complete Interrupt
UCSR1B = 0x98;
// Set frame format: 8 data, no stop bits or parity
// Asynchrounous USART mode
UCSR1C = 0x06;
// Set Speaker Pin to Pull-Up gives a low-volume click (XXX no other setting does, why?)
SPKR_DDR &= ~(1 << SPKR_POS);
SPKR_PORT |= (1 << SPKR_POS);
// Set Power Pin (I've traced this back to the "Power On" Switch, but I don't really know what it's for)
// Configured as a Pull-up Input - This pin "can" be read as well, it will go to GND when the "Power On" switch is pressed, and will read ~5V otherwise
// XXX Currently not used by the controller
POWR_DDR &= ~(1 << POWR_POS);
POWR_PORT |= (1 << POWR_POS);
// Reset the keyboard before scanning, we might be in a wierd state
scan_resetKeyboard();
}
// Main Detection Loop
// Not needed for the Sony NEWS, this is just a busy loop
inline uint8_t scan_loop()
{
return 0;
}
void processKeyValue( uint8_t keyValue )
{
// Detect release condition
uint8_t release = keyValue & 0x80;
// Finalize output buffer
// Mask 8th bit
keyValue &= 0x7F;
// Key Release
if ( release )
{
// 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 );
}
}
// Press or Repeated Key
else
{
// 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;
}
}
}
// USART Receive Buffer Full Interrupt
ISR(USART1_RX_vect)
{
cli(); // Disable Interrupts
uint8_t keyValue = 0x00;
// One scancode at a time (fastest interval ~3.95 ms - recorded, should still be ok for interrupt polling)
// Read the raw packet from the USART
keyValue = UDR1;
// Debug
char tmpStr[6];
hexToStr( keyValue, tmpStr );
dPrintStrs( tmpStr, " " );
// Process the scancode
if ( keyValue != 0x00 )
processKeyValue( keyValue );
sei(); // Re-enable Interrupts
}
// Send data to keyboard
uint8_t scan_sendData( uint8_t dataPayload )
{
// Debug
char tmpStr[6];
hexToStr( dataPayload, tmpStr );
info_dPrint( tmpStr, " " );
UDR1 = dataPayload;
return 0;
}
// Signal KeyIndex_Buffer that it has been properly read
// Not needed as a signal is sent to remove key-presses
void scan_finishedWithBuffer( void )
{
return;
}
// Reset/Hold keyboard TODO
// Warning! This will cause the keyboard to not send any data, so you can't disable with a keypress
void scan_lockKeyboard( void )
{
}
void scan_unlockKeyboard( void )
{
}
// Reset Keyboard
void scan_resetKeyboard( void )
{
// Empty buffer, now that keyboard has been reset
KeyIndex_BufferUsed = 0;
}
void scan_finishedWithUSBBuffer( void )
{
return;
}