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controller/Scan/MicroSwitch8304/scan_loop.c
Rowan Decker 1392571bd7 Fix whitespace
Use a consistent standard - Tabs in front for indenting, spaces after for anything else. This way everything stays nice and lined up while also letting users change there prefered indent level. Most of the new files from Haata where already in this format.
2015-03-08 18:40:01 -07:00

235 lines
5.8 KiB
C

/* Copyright (C) 2011,2014 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 -----
#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 )
{
Macro_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 );
}