242 lines
6.0 KiB
C
242 lines
6.0 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 RESET_PORT PORTB
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#define RESET_DDR DDRD
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#define RESET_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 UNSET_RESET() RESET_DDR &= ~(1 << RESET_PIN)
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#define SET_RESET() RESET_DDR |= (1 << RESET_PIN)
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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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// Buffer Signals
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volatile uint8_t BufferReadyToClear;
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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 the the USART interface for keyboard data input
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// NOTE: The input data signal needs to be inverted for the Teensy USART to properly work
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// Setup baud rate
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// 16 MHz / ( 16 * Baud ) = UBRR
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// Baud <- 0.82020 ms per bit, thus 1000 / 0.82020 = 1219.2
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// Thus baud setting = 820
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uint16_t baud = 820; // 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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// Asynchrounous USART mode
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// 8304 sends encoded scancodes (for example Alphanumeric 0-9 follows their keypad encoding scheme)
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// Separate line is for reset
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UCSR1C = 0x06;
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// Initially buffer doesn't need to be cleared (it's empty...)
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BufferReadyToClear = 0;
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// Reset the keyboard before scanning, we might be in a wierd state
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// Note: This should be run asap, but we need the USART setup to run this command on the 8304
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scan_resetKeyboard();
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}
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// Main Detection Loop
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// Not needed for the Micro Switch 8304, this is just a busy 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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void processKeyValue( uint8_t keyValue )
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{
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// Finalize output buffer
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// Mask 8th bit
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keyValue &= 0x7F;
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// Interpret scan code
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switch ( keyValue )
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{
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case 0x40: // Clear buffer command
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info_print("CLEAR!");
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BufferReadyToClear = 1;
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break;
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case 0x7F:
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scan_lockKeyboard();
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_delay_ms(3000);
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scan_unlockKeyboard();
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default:
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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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break;
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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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// The interrupt is always for the first item of the packet set, reset the buffer
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KeyIndex_BufferUsed = 0;
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// Only the first 7 bits have scancode data
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// The last packet of the packet set has the 8th bit high, all the others are low
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//
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// Interrupts are too slow for the rest of the packet set, poll for the rest
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while ( 1 )
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{
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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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processKeyValue( keyValue );
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// Last packet of the set
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if ( keyValue & 0x80 )
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{
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dPrintStrs( "**" );
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break;
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}
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// Delay enough so we don't run into the same packet (or the previous buffered packet)
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_delay_us(10000);
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}
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sei(); // Re-enable Interrupts
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}
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// Send data
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//
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// Keyboard Input Guide for Micro Switch 8304
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// 0xBX is for LED F1,F2,Over Type,Lock
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// 0xAX is for LED F3,F8,F9,F10
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// 0x92 resets keyboard (LED off, echo scancode mode off)
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// 0x9E sets echo scancode mode from (0x81 to 0xFF; translates to 0x01 to 0x7F)
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// Other echos: 0x15~0x19 send 0x15~0x19, 0x40 sends 0x40 (as well as 0x44,0x45, 0x80)
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// 0x8C Acks the keyboard and gets 0x70 sent back (delayed)
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uint8_t scan_sendData( uint8_t dataPayload )
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{
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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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// In the case of the Micro Switch 8304, we leave the buffer alone until more scancode data comes in
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void scan_finishedWithBuffer( void )
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{
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// We received a Clear code from the 8304, clear the buffer now that we've used it
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if ( BufferReadyToClear )
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{
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KeyIndex_BufferUsed = 0;
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BufferReadyToClear = 0;
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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( void )
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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 Micro Switch 8304 has a dedicated reset line
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void scan_lockKeyboard( void )
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{
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UNSET_RESET();
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}
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void scan_unlockKeyboard( void )
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{
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SET_RESET();
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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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// Reset command for the 8304
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scan_sendData( 0x92 );
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}
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