263 lines
6.2 KiB
C
263 lines
6.2 KiB
C
/* Copyright (C) 2011 by Jacob Alexander
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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// ----- Includes -----
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// AVR Includes
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#include <util/delay.h>
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// Project Includes
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#include <led.h>
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#include <print.h>
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// Local Includes
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#include "scan_loop.h"
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// ----- Defines -----
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// Pinout Defines
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#define CLK_READ PIND
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#define CLK_PORT PORTD
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#define CLK_DDR DDRD
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#define CLK_PIN 1
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#define DATA_READ PIND
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#define DATA_PORT PORTD
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#define DATA_DDR DDRD
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#define DATA_PIN 0
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#define INTR_PORT PORTD
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#define INTR_DDR DDRD
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#define INTR_PIN 0
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// ----- Macros -----
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#define READ_CLK CLK_READ & (1 << CLK_PIN) ? 1 : 0
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#define READ_DATA DATA_READ & (1 << DATA_PIN) ? 0 : 1
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#define UNSET_INTR() INTR_DDR &= ~(1 << INTR_PIN)
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#define SET_INTR() INTR_DDR |= (1 << INTR_PIN)
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#define bufferAdd(byte) \
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if ( KeyIndex_BufferUsed < KEYBOARD_BUFFER ) \
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KeyIndex_Buffer[KeyIndex_BufferUsed++] = byte
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// ----- Variables -----
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// Buffer used to inform the macro processing module which keys have been detected as pressed
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volatile uint8_t KeyIndex_Buffer[KEYBOARD_BUFFER];
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volatile uint8_t KeyIndex_BufferUsed;
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// Scan Code Retrieval Variables
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uint8_t inputData = 0xFF;
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uint8_t packet_index = 0;
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// ----- Functions -----
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// Setup
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inline void scan_setup()
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{
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// Initially reset the keyboard (just in case we are in a wierd state)
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scan_resetKeyboard();
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// Setup SPI for data input using the clock and data inputs
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// TODO
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/*
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// Setup inputs
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CLK_DDR &= ~(1 << CLK_PIN);
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DATA_DDR &= ~(1 << DATA_PIN);
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// Setup Pull-up's
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CLK_PORT &= ~(1 << CLK_PIN); // (CLK)
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DATA_PORT &= ~(1 << DATA_PIN); // (/DATA)
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*/
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// Setup Keyboard Interrupt
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INTR_DDR &= ~(1 << INTR_PIN);
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INTR_PORT &= ~(1 << INTR_PIN);
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// Setup Keyboard Reset Line
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// TODO
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}
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// Main Detection Loop
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inline uint8_t scan_loop()
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{
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/*
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// Packet Read
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if ( packet_index == 8 )
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{
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// Disable Error LED, proper key found
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errorLED( 0 );
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//#ifdef MAX_DEBUG
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// Crazy Debug (Read the Scan Code)
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char tmpStr[3];
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hexToStr_op( inputData, tmpStr, 2 );
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dPrintStrsNL( "Read Data: 0x", tmpStr );
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//#endif
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// - Map the scan code to the index array -
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// If the 8th bit is high, remove the keypress, else, add the keypress
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// The lower 7 bits are the array index
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KeyIndex_Array[(inputData & 0x7F)] = (inputData & 0x80) ? 0x00 : 0x80;
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// Reset Containers
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packet_index = 0;
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inputData = 0xFF;
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}
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// Bad Packet
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else if ( packet_index > 8 )
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{
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// Signal Error
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errorLED( 1 );
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char tmpStr[3];
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int8ToStr( packet_index, tmpStr );
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erro_dPrint( "Big packet? Mismatched... ", tmpStr );
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packet_index = 0;
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inputData = 0xFF;
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}
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*/
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// Disable keyboard interrupt (does nothing if already off)
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UNSET_INTR();
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/* XXX OLD CODE - Somewhat worked, has glitches, and is not compatible with the current API
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// Read the clock 8 times
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if ( READ_CLK )
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{
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// Mis-read packet, set back to 0
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if ( packet_index == -1 )
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packet_index = 0;
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// Append 1 bit of data
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inputData &= ~(READ_DATA << packet_index);
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packet_index++;
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// 8 Bits have been read
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if ( packet_index == 8 )
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{
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// Wait till clock edge falls
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while ( READ_CLK );
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// Sample both lines to make sure this is not a data value
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// and definitely the end of packet data blip
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uint16_t badDataCounter = 0;
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while ( !( READ_DATA ) && !( READ_CLK ) )
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badDataCounter++;
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if ( badDataCounter < 25 )
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{
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//#ifdef MAX_DEBUG
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// Crazy Debug (Read the Scan Code)
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char tmpStr[3];
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hexToStr_op( inputData, tmpStr, 2 );
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dbug_dPrint( "Read Data: 0x", tmpStr );
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//#endif
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// - Map the scan code to the index array -
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// If the 8th bit is high, remove the keypress, else, add the keypress
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// The lower 7 bits are the array index
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KeyIndex_Array[(inputData & 0x7F)] = (inputData & 0x80) ? 0x00 : 0x80;
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}
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// Even though this is a mis-read packet, we still know what the value is
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else
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{
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// Signal Error
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errorLED( 1 );
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char tmpStr[3];
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hexToStr_op( inputData, tmpStr, 2 );
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erro_dPrint( "Bad packet? Mismatched... 0x", tmpStr );
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}
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// Reset Containers
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inputData = 0xFF;
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packet_index = 0;
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// Interrupt the keyboard, so we don't get packet pieces...
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SET_INTR();
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// Do not wait for next clock, let USB do it's thing (if desired)
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return packet_index;
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}
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// Wait till clock edge falls
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while ( READ_CLK );
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}
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*/
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// Interrupt keyboard if there is no pending packet
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SET_INTR();
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return packet_index;
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}
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// Send data
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// XXX Not used with the Tandy1000
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uint8_t scan_sendData( uint8_t dataPayload )
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{
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return 0;
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}
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// Signal KeyIndex_Buffer that it has been properly read
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// TODO
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void scan_finishedWithBuffer( uint8_t sentKeys )
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{
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}
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// Signal that the keys have been properly sent over USB
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void scan_finishedWithUSBBuffer( uint8_t sentKeys )
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{
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}
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// Reset/Hold keyboard
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// Warning! This will cause the keyboard to not send any data, so you can't disable with a keypress
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// The Tandy 1000 keyboard has a dedicated hold/processor interrupt line
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void scan_lockKeyboard( void )
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{
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UNSET_INTR();
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}
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void scan_unlockKeyboard( void )
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{
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SET_INTR();
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}
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// Reset Keyboard
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void scan_resetKeyboard( void )
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{
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// TODO Tandy1000 has a dedicated reset line
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}
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