Archived
1
0
This repo is archived. You can view files and clone it, but cannot push or open issues or pull requests.
controller/Scan/Tandy1000/scan_loop.c
2011-11-28 22:20:04 -08:00

254 lines
5.9 KiB
C

/* 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 CLK_READ PIND
#define CLK_PORT PORTD
#define CLK_DDR DDRD
#define CLK_PIN 1
#define DATA_READ PIND
#define DATA_PORT PORTD
#define DATA_DDR DDRD
#define DATA_PIN 0
#define INTR_PORT PORTD
#define INTR_DDR DDRD
#define INTR_PIN 0
// ----- Macros -----
#define READ_CLK CLK_READ & (1 << CLK_PIN) ? 1 : 0
#define READ_DATA DATA_READ & (1 << DATA_PIN) ? 0 : 1
#define UNSET_INTR() INTR_DDR &= ~(1 << INTR_PIN)
#define SET_INTR() INTR_DDR |= (1 << INTR_PIN)
#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;
// Scan Code Retrieval Variables
uint8_t inputData = 0xFF;
uint8_t packet_index = 0;
// ----- Functions -----
// Setup
inline void scan_setup()
{
// Initially reset the keyboard (just in case we are in a wierd state)
scan_resetKeyboard();
// Setup SPI for data input using the clock and data inputs
// TODO
/*
// Setup inputs
CLK_DDR &= ~(1 << CLK_PIN);
DATA_DDR &= ~(1 << DATA_PIN);
// Setup Pull-up's
CLK_PORT &= ~(1 << CLK_PIN); // (CLK)
DATA_PORT &= ~(1 << DATA_PIN); // (/DATA)
*/
// Setup Keyboard Interrupt
INTR_DDR &= ~(1 << INTR_PIN);
INTR_PORT &= ~(1 << INTR_PIN);
// Setup Keyboard Reset Line
// TODO
}
// Main Detection Loop
inline uint8_t scan_loop()
{
/*
// Packet Read
if ( packet_index == 8 )
{
// Disable Error LED, proper key found
errorLED( 0 );
//#ifdef MAX_DEBUG
// Crazy Debug (Read the Scan Code)
char tmpStr[3];
hexToStr_op( inputData, tmpStr, 2 );
dPrintStrsNL( "Read Data: 0x", tmpStr );
//#endif
// - Map the scan code to the index array -
// If the 8th bit is high, remove the keypress, else, add the keypress
// The lower 7 bits are the array index
KeyIndex_Array[(inputData & 0x7F)] = (inputData & 0x80) ? 0x00 : 0x80;
// Reset Containers
packet_index = 0;
inputData = 0xFF;
}
// Bad Packet
else if ( packet_index > 8 )
{
// Signal Error
errorLED( 1 );
char tmpStr[3];
int8ToStr( packet_index, tmpStr );
erro_dPrint( "Big packet? Mismatched... ", tmpStr );
packet_index = 0;
inputData = 0xFF;
}
*/
// Disable keyboard interrupt (does nothing if already off)
UNSET_INTR();
// Read the clock 8 times
if ( READ_CLK )
{
// Mis-read packet, set back to 0
if ( packet_index == -1 )
packet_index = 0;
// Append 1 bit of data
inputData &= ~(READ_DATA << packet_index);
packet_index++;
// 8 Bits have been read
if ( packet_index == 8 )
{
// Wait till clock edge falls
while ( READ_CLK );
// Sample both lines to make sure this is not a data value
// and definitely the end of packet data blip
uint16_t badDataCounter = 0;
while ( !( READ_DATA ) && !( READ_CLK ) )
badDataCounter++;
if ( badDataCounter < 25 )
{
//#ifdef MAX_DEBUG
// Crazy Debug (Read the Scan Code)
char tmpStr[3];
hexToStr_op( inputData, tmpStr, 2 );
dbug_dPrint( "Read Data: 0x", tmpStr );
//#endif
// - Map the scan code to the index array -
// If the 8th bit is high, remove the keypress, else, add the keypress
// The lower 7 bits are the array index
KeyIndex_Array[(inputData & 0x7F)] = (inputData & 0x80) ? 0x00 : 0x80;
}
// Even though this is a mis-read packet, we still know what the value is
else
{
// Signal Error
errorLED( 1 );
char tmpStr[3];
hexToStr_op( inputData, tmpStr, 2 );
erro_dPrint( "Bad packet? Mismatched... 0x", tmpStr );
}
// Reset Containers
inputData = 0xFF;
packet_index = 0;
// Interrupt the keyboard, so we don't get packet pieces...
SET_INTR();
// Do not wait for next clock, let USB do it's thing (if desired)
return packet_index;
}
// Wait till clock edge falls
while ( READ_CLK );
}
// Interrupt keyboard if there is no pending packet
SET_INTR();
return packet_index;
}
// Send data
// XXX Not used with the Tandy1000
uint8_t scan_sendData( uint8_t dataPayload )
{
return 0;
}
// Signal KeyIndex_Buffer that it has been properly read
// TODO
void scan_finishedWithBuffer( void )
{
}
// Reset/Hold keyboard
// Warning! This will cause the keyboard to not send any data, so you can't disable with a keypress
// The Tandy 1000 keyboard has a dedicated hold/processor interrupt line
void scan_lockKeyboard( void )
{
UNSET_INTR();
}
void scan_unlockKeyboard( void )
{
SET_INTR();
}
// Reset Keyboard
void scan_resetKeyboard( void )
{
// TODO Tandy1000 has a dedicated reset line
}