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/* 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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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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// Reset the keyboard before scanning, we might be in a wierd state |
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_delay_ms( 1 ); |
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scan_resetKeyboard(); |
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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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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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// 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] == keyValue ) |
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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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// 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_finishedWithBuffer( void ) |
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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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return; |
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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 |
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// 1111 0 - CALC Off |
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uint8_t off = 0; |
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if ( !on ) |
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{ |
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off = 0x10; |
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} |
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scan_sendData( ( 0x40 | (ledNumber << 1) | on ) ^ off ); |
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} |
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// Read LED Status |
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// High priority data output (may overwrite some keycode data) |
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void scan_readLED( void ) |
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{ |
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scan_sendData( 0x7F ); |
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} |
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Jacob Alexander
12 年之前