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- /* Copyright (C) 2011 by Jacob Alexander
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
- // ----- Includes -----
-
- // Compiler Includes
- #include <Lib/ScanLib.h>
-
- // Project Includes
- #include <led.h>
- #include <print.h>
-
- // Local Includes
- #include "scan_loop.h"
-
-
-
- // ----- Defines -----
-
- // Pinout Defines
- #define RESET_PORT PORTB
- #define RESET_DDR DDRD
- #define RESET_PIN 0
-
-
- // ----- Macros -----
-
- // Make sure we haven't overflowed the buffer
- #define bufferAdd(byte) \
- if ( KeyIndex_BufferUsed < KEYBOARD_BUFFER ) \
- KeyIndex_Buffer[KeyIndex_BufferUsed++] = byte
-
- #define UNSET_RESET() RESET_DDR &= ~(1 << RESET_PIN)
- #define SET_RESET() RESET_DDR |= (1 << RESET_PIN)
-
-
-
- // ----- Variables -----
-
- // Buffer used to inform the macro processing module which keys have been detected as pressed
- volatile uint8_t KeyIndex_Buffer[KEYBOARD_BUFFER];
- volatile uint8_t KeyIndex_BufferUsed;
-
-
- // Buffer Signals
- volatile uint8_t BufferReadyToClear;
-
-
-
- // ----- Functions -----
-
- // Setup
- inline void scan_setup()
- {
- // Setup the the USART interface for keyboard data input
- // NOTE: The input data signal needs to be inverted for the Teensy USART to properly work
-
- // Setup baud rate
- // 16 MHz / ( 16 * Baud ) = UBRR
- // Baud <- 0.82020 ms per bit, thus 1000 / 0.82020 = 1219.2
- // Thus baud setting = 820
- uint16_t baud = 820; // Max setting of 4095
- UBRR1H = (uint8_t)(baud >> 8);
- UBRR1L = (uint8_t)baud;
-
- // Enable the receiver, transitter, and RX Complete Interrupt
- UCSR1B = 0x98;
-
- // Set frame format: 8 data, no stop bits or parity
- // Asynchrounous USART mode
- // 8304 sends encoded scancodes (for example Alphanumeric 0-9 follows their keypad encoding scheme)
- // Separate line is for reset
- UCSR1C = 0x06;
-
- // Initially buffer doesn't need to be cleared (it's empty...)
- BufferReadyToClear = 0;
-
- // Reset the keyboard before scanning, we might be in a wierd state
- // Note: This should be run asap, but we need the USART setup to run this command on the 8304
- scan_resetKeyboard();
- }
-
-
- // Main Detection Loop
- // Not needed for the Micro Switch 8304, this is just a busy loop
- inline uint8_t scan_loop()
- {
- return 0;
- }
-
- void processKeyValue( uint8_t keyValue )
- {
- // Finalize output buffer
- // Mask 8th bit
- keyValue &= 0x7F;
-
- // Interpret scan code
- switch ( keyValue )
- {
- case 0x40: // Clear buffer command
- info_print("CLEAR!");
-
- BufferReadyToClear = 1;
- break;
- case 0x7F:
- scan_lockKeyboard();
- _delay_ms(3000);
- scan_unlockKeyboard();
-
- default:
- // Make sure the key isn't already in the buffer
- for ( uint8_t c = 0; c < KeyIndex_BufferUsed + 1; c++ )
- {
- // Key isn't in the buffer yet
- if ( c == KeyIndex_BufferUsed )
- {
- bufferAdd( keyValue );
- break;
- }
-
- // Key already in the buffer
- if ( KeyIndex_Buffer[c] == keyValue )
- break;
- }
- break;
- }
- }
-
- // USART Receive Buffer Full Interrupt
- ISR(USART1_RX_vect)
- {
- cli(); // Disable Interrupts
-
- uint8_t keyValue = 0x00;
-
- // The interrupt is always for the first item of the packet set, reset the buffer
- KeyIndex_BufferUsed = 0;
-
- // Only the first 7 bits have scancode data
- // The last packet of the packet set has the 8th bit high, all the others are low
- //
- // Interrupts are too slow for the rest of the packet set, poll for the rest
- while ( 1 )
- {
- // Read the raw packet from the USART
- keyValue = UDR1;
-
- // Debug
- char tmpStr[6];
- hexToStr( keyValue, tmpStr );
- dPrintStrs( tmpStr, " " );
-
- // Process the scancode
- processKeyValue( keyValue );
-
- // Last packet of the set
- if ( keyValue & 0x80 )
- {
- dPrintStrs( "**" );
- break;
- }
-
- // Delay enough so we don't run into the same packet (or the previous buffered packet)
- _delay_us(10000);
- }
-
- sei(); // Re-enable Interrupts
- }
-
- // Send data
- //
- // Keyboard Input Guide for Micro Switch 8304
- // 0xBX is for LED F1,F2,Over Type,Lock
- // 0xAX is for LED F3,F8,F9,F10
- // 0x92 resets keyboard (LED off, echo scancode mode off)
- // 0x9E sets echo scancode mode from (0x81 to 0xFF; translates to 0x01 to 0x7F)
- // Other echos: 0x15~0x19 send 0x15~0x19, 0x40 sends 0x40 (as well as 0x44,0x45, 0x80)
- // 0x8C Acks the keyboard and gets 0x70 sent back (delayed)
- uint8_t scan_sendData( uint8_t dataPayload )
- {
- UDR1 = dataPayload;
- return 0;
- }
-
- // Signal KeyIndex_Buffer that it has been properly read
- // In the case of the Micro Switch 8304, we leave the buffer alone until more scancode data comes in
- void scan_finishedWithBuffer( uint8_t sentKeys )
- {
- // We received a Clear code from the 8304, clear the buffer now that we've used it
- if ( BufferReadyToClear )
- {
- KeyIndex_BufferUsed = 0;
- BufferReadyToClear = 0;
- }
- }
-
- // Signal that the keys have been properly sent over USB
- void scan_finishedWithUSBBuffer( uint8_t sentKeys )
- {
- }
-
- // Reset/Hold keyboard
- // Warning! This will cause the keyboard to not send any data, so you can't disable with a keypress
- // The Micro Switch 8304 has a dedicated reset line
- void scan_lockKeyboard( void )
- {
- UNSET_RESET();
- }
-
- void scan_unlockKeyboard( void )
- {
- SET_RESET();
- }
-
- // Reset Keyboard
- void scan_resetKeyboard( void )
- {
- // Reset command for the 8304
- scan_sendData( 0x92 );
- }
-
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