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controller/Scan/MicroSwitch8304/scan_loop.c

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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;
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// 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();
}
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// Reset Keyboard
void scan_resetKeyboard( void )
{
// Reset command for the 8304
scan_sendData( 0x92 );
}