277 lines
6.4 KiB
C
277 lines
6.4 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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// 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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// ----- 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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// ----- 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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// Known signals
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static uint8_t cmd_clickOFF = 0x0A; // Short beep, turns off clicker
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static uint8_t cmd_clickON = 0x04; // Long beep, turns on clicker
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static uint8_t cmd_ACK_AA = 0x10; // Keyboard will send ack (0xAA) back to PC
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// Other known signals
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// 0x02 turns on clicker but with short beep
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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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// Setup baud rate
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// 16 MHz / ( 16 * Baud ) = UBRR
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// Baud <- 3.358 ms per bit, thus 1000 / 3.358 = 297.80
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// Thus baud = 3357
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uint16_t baud = 3357; // 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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// Kaypro sends ASCII codes (mostly standard) with 1 start bit and 8 data bits, with no trailing stop or parity bits
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UCSR1C = 0x06;
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}
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// Main Detection Loop
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// Nothing is needed here for the Kaypro, but the function is available as part of the api to be called in a polling fashion
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// TODO
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// - Add songs :D
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inline uint8_t scan_loop()
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{
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// We *could* do extra offline processing here, but, it's not really needed for the Kaypro 1 keyboard
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return 0;
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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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// Get key from USART
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uint8_t keyValue = UDR1;
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//#ifdef MAX_DEBUG
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// Debug print key
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char tmpStr1[6];
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hexToStr( keyValue, tmpStr1 );
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dPrintStrs( tmpStr1, " " );
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//#endif
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// Add key(s) to processing buffer
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// First split out Shift and Ctrl
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// Reserved Codes:
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// Shift - 0xF5
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// Ctrl - 0xF6
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switch ( keyValue )
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{
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// - Ctrl Keys -
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// Exception keys
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case 0x08: // ^H
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case 0x09: // ^I
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case 0x0D: // ^M
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case 0x1B: // ^[
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bufferAdd( keyValue );
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break;
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// 0x40 Offset Keys
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// Add Ctrl key and offset to the lower alphabet
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case 0x00: // ^@
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case 0x1C: // "^\"
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case 0x1D: // ^]
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case 0x1E: // ^^
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case 0x1F: // ^_
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bufferAdd( 0xF6 );
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bufferAdd( keyValue + 0x40 );
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break;
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// - Add Shift key and offset to non-shifted key -
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// 0x10 Offset Keys
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case 0x21: // !
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case 0x23: // #
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case 0x24: // $
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case 0x25: // %
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bufferAdd( 0xF5 );
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bufferAdd( keyValue + 0x10 );
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break;
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// 0x11 Offset Keys
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case 0x26: // &
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case 0x28: // (
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bufferAdd( 0xF5 );
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bufferAdd( keyValue + 0x11 );
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break;
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// 0x07 Offset Keys
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case 0x29: // )
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bufferAdd( 0xF5 );
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bufferAdd( keyValue + 0x07 );
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break;
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// -0x0E Offset Keys
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case 0x40: // @
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bufferAdd( 0xF5 );
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bufferAdd( keyValue - 0x0E );
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break;
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// 0x0E Offset Keys
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case 0x2A: // *
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bufferAdd( 0xF5 );
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bufferAdd( keyValue + 0x0E );
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break;
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// 0x12 Offset Keys
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case 0x2B: // +
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bufferAdd( 0xF5 );
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bufferAdd( keyValue + 0x12 );
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break;
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// 0x05 Offset Keys
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case 0x22: // "
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bufferAdd( 0xF5 );
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bufferAdd( keyValue + 0x05 );
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break;
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// 0x01 Offset Keys
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case 0x3A: // :
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bufferAdd( 0xF5 );
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bufferAdd( keyValue + 0x01 );
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break;
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// -0x10 Offset Keys
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case 0x3C: // <
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case 0x3E: // >
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case 0x3F: // ?
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bufferAdd( 0xF5 );
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bufferAdd( keyValue - 0x10 );
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break;
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// -0x28 Offset Keys
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case 0x5E: // ^
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bufferAdd( 0xF5 );
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bufferAdd( keyValue - 0x28 );
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break;
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// -0x32 Offset Keys
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case 0x5F: // _
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bufferAdd( 0xF5 );
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bufferAdd( keyValue - 0x32 );
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break;
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// -0x20 Offset Keys
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case 0x7B: // {
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case 0x7C: // |
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case 0x7D: // }
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bufferAdd( 0xF5 );
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bufferAdd( keyValue - 0x20 );
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break;
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// -0x1E Offset Keys
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case 0x7E: // ~
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bufferAdd( 0xF5 );
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bufferAdd( keyValue - 0x1E );
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break;
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// All other keys
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default:
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// Ctrl Characters are from 0x00 to 0x1F, excluding:
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// 0x08 - Backspace
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// 0x09 - [Horizontal] Tab
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// 0x0D - [Carriage] Return
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// 0x1B - Escape
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// 0x7F - Delete (^?) (Doesn't need to be split out)
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// 0x60 Offset Keys
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// Add Ctrl key and offset to the lower alphabet
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if ( keyValue >= 0x00 && keyValue <= 0x1F )
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{
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bufferAdd( 0xF6 );
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bufferAdd( keyValue + 0x60 );
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}
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// Shift Characters are from 0x41 to 0x59
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// No exceptions here :D
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// Add Shift key and offset to the lower alphabet
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else if ( keyValue >= 0x41 && keyValue <= 0x5A )
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{
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bufferAdd( 0xF5 );
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bufferAdd( keyValue + 0x20 );
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}
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// Everything else
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else
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{
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bufferAdd( keyValue );
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}
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break;
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}
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// Special keys - For communication to the keyboard
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// TODO Try to push this functionality into the macros...somehow
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switch ( keyValue )
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{
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case 0xC3: // Keypad Enter
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print("\n");
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info_print("BEEEEP! - Clicker on");
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UDR1 = cmd_clickON;
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break;
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case 0xB2: // Keypad Decimal
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print("\n");
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info_print("BEEP! - Clicker off");
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UDR1 = cmd_clickOFF;
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break;
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case 0x0A: // Line Feed
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print("\n");
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info_print("ACK!!");
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UDR1 = cmd_ACK_AA;
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break;
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}
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sei(); // Re-enable Interrupts
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}
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