Adding initial HP150 and IBMConvertible scan modules.

- HP150 is not ready
- IBMConvertible is ready to start testing

Scan/HP150/scan_loop.c

@@ -0,0 +1,239 @@
+/* Copyright (C) 2012 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 -----
+
+// AVR Includes
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include <util/delay.h>
+
+// Project Includes
+#include <led.h>
+#include <print.h>
+
+// Local Includes
+#include "scan_loop.h"
+
+
+
+// ----- Defines -----
+
+// Pinout Defines
+#define DATA_PORT PORTC
+#define DATA_DDR   DDRC
+#define DATA_PIN      7
+
+#define CLOCK_PORT PORTC
+#define CLOCK_DDR   DDRC
+#define CLOCK_PIN      6
+
+#define RESET_PORT PORTF
+#define RESET_DDR   DDRF
+#define RESET_PIN      7
+
+
+// ----- Macros -----
+
+// Make sure we haven't overflowed the buffer
+#define bufferAdd(byte) \
+		if ( KeyIndex_BufferUsed < KEYBOARD_BUFFER ) \
+			KeyIndex_Buffer[KeyIndex_BufferUsed++] = byte
+
+
+
+// ----- 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;
+volatile uint8_t KeyIndex_Add_InputSignal; // Used to pass the (click/input value) to the keyboard for the clicker
+
+volatile uint8_t currentWaveState = 0;
+
+
+// Buffer Signals
+volatile uint8_t BufferReadyToClear;
+
+
+
+// ----- Function Declarations -----
+
+void processKeyValue( uint8_t keyValue );
+void  removeKeyValue( uint8_t keyValue );
+
+
+
+// ----- Interrupt Functions -----
+
+// Generates a constant external clock
+ISR( TIMER1_COMPA_vect )
+{
+	if ( currentWaveState )
+	{
+		CLOCK_PORT &= ~(1 << CLOCK_PIN);
+		currentWaveState--;
+	}
+	else
+	{
+		CLOCK_PORT |=  (1 << CLOCK_PIN);
+		currentWaveState++;
+	}
+}
+
+
+
+// ----- Functions -----
+
+// Setup
+inline void scan_setup()
+{
+	// Setup Timer Pulse (16 bit)
+
+	// TODO Clock can be adjusted to whatever (read chip datasheets for limits)
+	// 16 MHz / (2 * Prescaler * (1 + OCR1A)) = 1200.1 baud
+	// Prescaler is 1
+	// Twice every 1200 baud (actually 1200.1, timer isn't accurate enough)
+	// This is close to 820 us, but a bit slower
+	cli();
+	TCCR1B = 0x09;
+	OCR1AH = 0x01;
+	OCR1AL = 0x09;
+	TIMSK1 = (1 << OCIE1A);
+	CLOCK_DDR = (1 << CLOCK_PIN);
+	sei();
+
+
+	// Initially buffer doesn't need to be cleared (it's empty...)
+	BufferReadyToClear = 0;
+
+	// InputSignal is off by default
+	KeyIndex_Add_InputSignal = 0x00;
+
+	// Reset the keyboard before scanning, we might be in a wierd state
+	scan_resetKeyboard();
+}
+
+
+// Main Detection Loop
+// Since this function is non-interruptable, we can do checks here on what stage of the
+//  output clock we are at (0 or 1)
+// We are looking for a start of packet
+// If detected, all subsequent bits are then logged into a variable
+// Once the end of the packet has been detected (always the same length), decode the pressed keys
+inline uint8_t scan_loop()
+{
+	return 0;
+}
+
+void processKeyValue( uint8_t keyValue )
+{
+	// Interpret scan code
+	switch ( keyValue )
+	{
+	case 0x00: // Break code from input?
+		break;
+	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 );
+
+				// Only send data if enabled
+				if ( KeyIndex_Add_InputSignal )
+					scan_sendData( KeyIndex_Add_InputSignal );
+				break;
+			}
+
+			// Key already in the buffer
+			if ( KeyIndex_Buffer[c] == keyValue )
+				break;
+		}
+		break;
+	}
+}
+
+void removeKeyValue( uint8_t keyValue )
+{
+	// Check for the released key, and shift the other keys lower on the buffer
+	uint8_t c;
+	for ( c = 0; c < KeyIndex_BufferUsed; c++ )
+	{
+		// Key to release found
+		if ( KeyIndex_Buffer[c] == keyValue )
+		{
+			// Shift keys from c position
+			for ( uint8_t k = c; k < KeyIndex_BufferUsed - 1; k++ )
+				KeyIndex_Buffer[k] = KeyIndex_Buffer[k + 1];
+
+			// Decrement Buffer
+			KeyIndex_BufferUsed--;
+
+			break;
+		}
+	}
+
+	// Error case (no key to release)
+	if ( c == KeyIndex_BufferUsed + 1 )
+	{
+		errorLED( 1 );
+		char tmpStr[6];
+		hexToStr( keyValue, tmpStr );
+		erro_dPrint( "Could not find key to release: ", tmpStr );
+	}
+}
+
+// Send data 
+uint8_t scan_sendData( uint8_t dataPayload )
+{
+	return 0;
+}
+
+// Signal KeyIndex_Buffer that it has been properly read
+void scan_finishedWithBuffer( void )
+{
+}
+
+// Signal that the keys have been properly sent over USB
+void scan_finishedWithUSBBuffer( void )
+{
+}
+
+// Reset/Hold keyboard
+// NOTE: Does nothing with the BETKB
+void scan_lockKeyboard( void )
+{
+}
+
+// NOTE: Does nothing with the BETKB
+void scan_unlockKeyboard( void )
+{
+}
+
+// Reset Keyboard
+void scan_resetKeyboard( void )
+{
+	// TODO Determine the scan period, and the interval to scan each bit
+}
+