574 lines
14 KiB
C
574 lines
14 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 CLOCK_PORT PORTB
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#define CLOCK_DDR DDRB
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#define CLOCK_PIN 0
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// ----- Macros -----
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// Make sure we haven't overflowed the buffer
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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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#define setLED(id, status) \
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status = status ? 0 : 1; \
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scan_setLED( id, status )
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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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volatile uint8_t currentWaveState = 0;
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volatile uint8_t calcLED = 0;
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volatile uint8_t insertLED = 0;
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volatile uint8_t shiftLockLED = 0;
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volatile uint8_t schedLED = 0;
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volatile uint8_t drawLED = 0;
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// ----- Function Declarations -----
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void scan_diagnostics( void );
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void processKeyValue( uint8_t keyValue );
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void scan_diagnostics( void );
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void scan_setRepeatStart( uint8_t n );
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void scan_readSwitchStatus( void );
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void scan_repeatControl( uint8_t on );
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void scan_enableKeyboard( uint8_t enable );
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void scan_setRepeatRate( uint8_t n );
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void scan_setLED( uint8_t ledNumber, uint8_t on );
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void scan_readLED( void );
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// ----- Interrupt Functions -----
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// Generates a constant external clock
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ISR( TIMER1_COMPA_vect )
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{
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if ( currentWaveState )
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{
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CLOCK_PORT &= ~(1 << CLOCK_PIN);
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currentWaveState--;
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}
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else
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{
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CLOCK_PORT |= (1 << CLOCK_PIN);
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currentWaveState++;
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}
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}
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// USART Receive Buffer Full Interrupt
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ISR(USART1_RX_vect)
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{
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cli(); // Disable Interrupts
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uint8_t keyValue = 0x00;
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// Read the raw packet from the USART
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keyValue = UDR1;
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// Debug
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char tmpStr[6];
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hexToStr( keyValue, tmpStr );
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dPrintStrs( tmpStr, " " );
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// Process the scancode
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if ( keyValue != 0x00 )
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processKeyValue( keyValue );
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sei(); // Re-enable Interrupts
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}
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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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// Setup Timer Pulse (16 bit)
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// 16 MHz / (2 * Prescaler * (1 + OCR1A)) = 1204.8 baud (820 us)
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// Prescaler is 1
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/*
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TCCR1B = 0x09;
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OCR1AH = 0x19;
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OCR1AL = 0xEF;
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TIMSK1 = (1 << OCIE1A);
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CLOCK_DDR = (1 << CLOCK_PIN);
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*/
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// 16 MHz / (2 * Prescaler * (1 + OCR1A)) = 1200.1 baud
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// Prescaler is 1
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// Twice every 1200 baud (actually 1200.1, timer isn't accurate enough)
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// This is close to 820 us, but a bit slower
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cli();
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TCCR1B = 0x09;
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OCR1AH = 0x1A;
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OCR1AL = 0x09;
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TIMSK1 = (1 << OCIE1A);
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CLOCK_DDR = (1 << CLOCK_PIN);
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// Setup the the USART interface for keyboard data input
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// Setup baud rate
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// 16 MHz / ( 16 * Baud ) = UBRR
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// Baud <- 1200 as per the spec (see datasheet archives), rounding to 1200.1 (as that's as accurate as the timer can be)
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// Thus UBRR = 833.26 -> round to 833
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uint16_t baud = 833; // Max setting of 4095
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UBRR1H = (uint8_t)(baud >> 8);
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UBRR1L = (uint8_t)baud;
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// Enable the receiver, transitter, and RX Complete Interrupt
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UCSR1B = 0x98;
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// Set frame format: 8 data, no stop bits or parity
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// Synchrounous USART mode
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// Tx Data on Falling Edge, Rx on Rising
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UCSR1C = 0x47;
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sei();
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// Reset the keyboard before scanning, we might be in a wierd state
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_delay_ms( 50 );
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scan_resetKeyboard();
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_delay_ms( 5000 ); // Wait for the reset command to finish enough for new settings to take hold afterwards
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scan_setRepeatRate( 0x00 ); // Set the fastest repeat rate
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}
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// Main Detection Loop
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// Nothing is required here with the Epson QX-10 Keyboards as the interrupts take care of the inputs
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inline uint8_t scan_loop()
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{
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return 0;
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}
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// TODO
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void processKeyValue( uint8_t keyValue )
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{
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// Detect LED Status
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uint8_t inputType = keyValue & 0xC0;
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// Determine the input type
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switch ( inputType )
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{
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// LED Status
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case 0xC0:
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// Binary Representation: 1100 llln
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// Hex Range: 0xC0 to 0xCF
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// - First 3 bits determine which LED (0 to 7)
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// - Last bit is whether the LED is On (1) or Off (0)
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// 000 - N/A (A)
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// 001 - N/A (B)
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// 010 - INSERT
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// 011 - SHIFT LOCK
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// 100 - N/A (C)
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// 101 - DRAW
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// 110 - SCHED
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// 111 - CALC
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break;
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// SW (Switch) Status
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case 0x80:
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{
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// Binary Representation: 1000 dddn
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// Hex Range: 0x80 to 0x8F
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// - First 3 bits determine which DB (KRTN) (See datasheet)
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// - Last bit is whether the key is enabled
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// 000 - N/A?
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// 001 - N/A?
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// 010 - Right SHIFT
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// 011 - Left SHIFT
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// 100 - N/A?
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// 101 - Left CTRL
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// 110 - GRPH SHIFT
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// 111 - Right CTRL
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// Detect Modifier Press/Release
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uint8_t press = keyValue & 0x01;
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// Modifier Press Detected
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if ( press )
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{
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// Make sure the key isn't already in the buffer
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for ( uint8_t c = 0; c < KeyIndex_BufferUsed + 1; c++ )
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{
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// Key isn't in the buffer yet
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if ( c == KeyIndex_BufferUsed )
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{
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bufferAdd( keyValue );
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break;
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}
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// Key already in the buffer
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if ( KeyIndex_Buffer[c] == keyValue )
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break;
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}
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}
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// Modifier Release Detected
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else
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{
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uint8_t actualKeyValue = keyValue | 0x01;
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// Check for the released key, and shift the other keys lower on the buffer
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uint8_t c;
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for ( c = 0; c < KeyIndex_BufferUsed; c++ )
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{
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// Key to release found
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if ( KeyIndex_Buffer[c] == actualKeyValue )
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{
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// Shift keys from c position
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for ( uint8_t k = c; k < KeyIndex_BufferUsed - 1; k++ )
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KeyIndex_Buffer[k] = KeyIndex_Buffer[k + 1];
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// Decrement Buffer
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KeyIndex_BufferUsed--;
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break;
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}
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}
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// Error case (no key to release)
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if ( c == KeyIndex_BufferUsed + 1 )
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{
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errorLED( 1 );
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char tmpStr[6];
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hexToStr( keyValue, tmpStr );
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erro_dPrint( "Could not find key to release: ", tmpStr );
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}
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}
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break;
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}
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// Key code
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default:
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// Binary Representation: 0ddd pppp
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// Hex Range: 0x00 to 0x7F
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// - First 3 bits determine which DB (KRTN) (See datasheet)
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// - Last 4 bits corresond to the KSC signals (P13, P12, P11, P10 respectively)
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// Or, that can be read as, each key has it's own keycode (with NO release code)
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// Modifiers are treated differently
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// Add the key to the buffer, if it isn't already in the current Key Buffer
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for ( uint8_t c = 0; c < KeyIndex_BufferUsed + 1; c++ )
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{
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// Key isn't in the buffer yet
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if ( c == KeyIndex_BufferUsed )
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{
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bufferAdd( keyValue );
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break;
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}
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// Key already in the buffer
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if ( KeyIndex_Buffer[c] == keyValue )
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break;
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}
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// Special Internal Key Mapping/Functions
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switch ( keyValue )
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{
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// LED Test
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case 0x0A: // CALC
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setLED( 0x07, calcLED ); // 0x4F
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break;
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case 0x0B: // SCHED
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setLED( 0x0E, schedLED ); // 0x5D
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break;
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case 0x0C: // DRAW
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setLED( 0x0D, drawLED ); // 0x5B
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break;
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case 0x42: // SHIFT LOCK
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setLED( 0x0B, shiftLockLED ); // 0x57
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break;
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case 0x5E: // INSERT
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setLED( 0x02, insertLED ); // 0x45
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break;
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/*
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// TEST
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case 0x51:
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scan_resetKeyboard();
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break;
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case 0x52:
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scan_diagnostics();
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break;
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case 0x53:
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scan_setRepeatStart( 0x00 );
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break;
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case 0x54:
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scan_readSwitchStatus();
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break;
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case 0x55:
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scan_repeatControl( 0x00 );
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break;
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case 0x56:
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scan_repeatControl( 0x01 );
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break;
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case 0x57:
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scan_enableKeyboard( 0x00 );
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break;
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case 0x58:
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scan_enableKeyboard( 0x01 );
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break;
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case 0x59:
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scan_setRepeatRate( 0x00 );
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break;
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case 0x5A:
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scan_readLED();
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break;
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*/
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}
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break;
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}
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}
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// Send data
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// See below functions for the input sequences for the Epson QX-10 Keyboard
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uint8_t scan_sendData( uint8_t dataPayload )
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{
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// Debug
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char tmpStr[6];
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hexToStr( dataPayload, tmpStr );
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info_dPrint( tmpStr, " " );
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UDR1 = dataPayload;
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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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inline void scan_finishedWithBuffer( uint8_t sentKeys )
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{
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return;
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}
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// Signal that the keys have been properly sent over USB
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// For the Epson QX-10 only the modifier keys have release signals
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// Therefore, only 5 keys could possibly be assigned as a modifiers
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// The rest of the keys are single press (like the Kaypro keyboards)
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//
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// However, this differentiation causes complications on how the key signals are discarded and used
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// The single keypresses must be discarded immediately, while the modifiers must be kept
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inline void scan_finishedWithUSBBuffer( uint8_t sentKeys )
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{
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uint8_t foundModifiers = 0;
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// Look for all of the modifiers present, there is a max of 8 (but only keys for 5 on the HASCI version)
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for ( uint8_t c = 0; c < KeyIndex_BufferUsed; c++ )
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{
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// The modifier range is from 0x80 to 0x8F (well, the last bit is the ON/OFF signal, but whatever...)
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if ( KeyIndex_Buffer[c] <= 0x8F && KeyIndex_Buffer[c] >= 0x80 )
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{
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// Add the modifier back into the the Key Buffer
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KeyIndex_Buffer[foundModifiers] = KeyIndex_Buffer[c];
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foundModifiers++;
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}
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}
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// Adjust the size of the new Key Buffer
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KeyIndex_BufferUsed = foundModifiers;
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/* Non-working, too slow (too much traffic on the bus)
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// Poll the modifiers using an input command
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uint8_t oldBuffer = KeyIndex_BufferUsed;
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KeyIndex_BufferUsed = 0;
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if ( oldBuffer )
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scan_readSwitchStatus();
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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 Epson QX-10 Keyboards have a command used to lock the keyboard output
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void scan_lockKeyboard( void )
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{
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scan_enableKeyboard( 0x00 );
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}
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void scan_unlockKeyboard( void )
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{
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scan_enableKeyboard( 0x01 );
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}
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// Reset Keyboard
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// Does the following
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// - Clears the keycode buffer (32 characters)
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// - Validates repeat function (what does this do?)
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// - Sets repeat start time (500 ms)
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// - Sets repeat interval (50 ms)
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// - Turns off all LEDs
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void scan_resetKeyboard( void )
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{
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// Reset command for the QX-10 Keyboard
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scan_sendData( 0xE0 );
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// Empty buffer, now that keyboard has been reset
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KeyIndex_BufferUsed = 0;
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}
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// TODO Check
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// Runs Diagnostics on the keyboard
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// - First does a reset (see scan_resetKeyboard)
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// - Blinks all of the LEDs one after another
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// - Outputs 0x00 if no keys are pressed
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// - Outputs 0xFF if any keys are being pressed
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void scan_diagnostics( void )
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{
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// Send reset command with diagnositics
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scan_sendData( 0xE7 );
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}
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// TODO Check
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// Set Repeat Interval Start
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// 300 ms + n * 25 ms
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// Interval after which to start the repeated keys
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void scan_setRepeatStart( uint8_t n )
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{
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// Send command
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// Binary Representation: 000n nnnn
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// Hex boundaries 0x00 to 0x1F
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// 300 ms to 1075 ms (intervals of 25 ms)
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scan_sendData( n );
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}
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// Read Switch Status (preferential to actual keypress outputs)
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// 000 - N/A?
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// 001 - N/A?
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// 010 - Right SHIFT
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// 011 - Left SHIFT
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// 100 - N/A?
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// 101 - Left CTRL
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// 110 - GRPH SHIFT
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// 111 - Right CTRL
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void scan_readSwitchStatus( void )
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{
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scan_sendData( 0x80 );
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}
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// TODO Check
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// Repeat Control
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// 0x00 Stops repeat function
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// 0x01 Enables repeat function
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void scan_repeatControl( uint8_t on )
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{
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// Send command
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// Binary Representation: 101X XXXn
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// Hex options: 0xA0 or 0xA1
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scan_sendData( 0xA0 | on );
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}
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// TODO Check
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// Enable Sending Keyboard Data
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// 0x00 Stops keycode transmission
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// 0x01 Enables keycode transmission
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void scan_enableKeyboard( uint8_t enable )
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{
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// Send command
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// Binary Representation: 110X XXXn
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// Hex options: 0xC0 or 0xC1
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scan_sendData( 0xC0 | enable );
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}
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// Set Repeat Interval
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// 30 ms + n * 5 ms
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// Period between sending each repeated key after the initial interval
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void scan_setRepeatRate( uint8_t n )
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{
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// Send command
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// Binary Representation: 001n nnnn
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// Hex options: 0x00 to 0x1F
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// 30 ms to 185 ms (intervals of 5 ms)
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scan_sendData( 0x20 | n );
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}
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// Turn On/Off LED
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// 0x00 LED Off
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// 0x01 LED On
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//
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// 8 LEDs max (Note: 5 connected on my board, there is 1 position empty on the PCB for a total of 6)
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// 0 to 7 (0x0 to 0x7)
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void scan_setLED( uint8_t ledNumber, uint8_t on )
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{
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// Send command
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// Binary Representation: 010l llln
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// Hex options: 0x40 to 0x4F
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// The spec is NOT accurate (especially about the "don't care" bit)
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// llll n - Usage
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// 0000 X - N/A (1)
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// 0001 X - N/A (2)
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// 0010 1 - INSERT On
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// 0011 0 - SHIFT LOCK Off
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// 0100 X - N/A (3)
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// 0101 0 - DRAW Off
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// 0110 0 - SCHED Off
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// 0111 1 - CALC On
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// 1000 X - N/A (1)
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// 1001 X - N/A (2)
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// 1010 0 - INSERT Off
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// 1011 1 - SHIFT LOCK On
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// 1100 X - N/A (3)
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// 1101 1 - DRAW On
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// 1110 1 - SCHED On
|
|
// 1111 0 - CALC Off
|
|
|
|
uint8_t off = 0;
|
|
if ( !on )
|
|
{
|
|
off = 0x10;
|
|
}
|
|
scan_sendData( ( 0x40 | (ledNumber << 1) | on ) ^ off );
|
|
}
|
|
|
|
// Read LED Status
|
|
// High priority data output (may overwrite some keycode data)
|
|
void scan_readLED( void )
|
|
{
|
|
scan_sendData( 0x7F );
|
|
}
|
|
|