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Completing the HP150 converter.

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This commit is contained in:
Jacob Alexander 2012-11-17 02:13:06 -08:00
parent 0c39927268
commit 59e443552c
5 changed files with 335 additions and 291 deletions
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162
Scan/HP150/scan_loop.c
View file

@ -41,6 +41,7 @@
#define DATA_PORT PORTC
#define DATA_DDR DDRC
#define DATA_PIN 7
#define DATA_OUT PINC
#define CLOCK_PORT PORTC
#define CLOCK_DDR DDRC
@ -68,6 +69,8 @@ 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;
volatile uint8_t currentWaveDone = 0;
volatile uint8_t positionCounter = 0;
// Buffer Signals
@ -90,7 +93,9 @@ ISR( TIMER1_COMPA_vect )
if ( currentWaveState )
{
CLOCK_PORT &= ~(1 << CLOCK_PIN);
currentWaveState--;
currentWaveState--; // Keeps track of the clock value (for direct clock output)
currentWaveDone--; // Keeps track of whether the current falling edge has been processed
positionCounter++; // Counts the number of falling edges, reset is done by the controlling section (reset, or main scan)
}
else
{
@ -109,14 +114,15 @@ 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
// This seems like a good scan speed, as there don't seem to be any periodic
// de-synchronization events, and is fast enough for scanning keys
// Anything much more (100k baud), tends to cause a lot of de-synchronization
// 16 MHz / (2 * Prescaler * (1 + OCR1A)) = 10k 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;
OCR1AH = 0x03;
OCR1AL = 0x1F;
TIMSK1 = (1 << OCIE1A);
CLOCK_DDR = (1 << CLOCK_PIN);
sei();
@ -125,9 +131,6 @@ inline void scan_setup()
// 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();
}
@ -141,67 +144,75 @@ inline void scan_setup()
// 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 )
// Read on each falling edge/after the falling edge of the clock
if ( !currentWaveDone )
{
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++ )
// Sample the current value 50 times
// If there is a signal for 40/50 of the values, then it is active
// This works as a very simple debouncing mechanism
// XXX Could be done more intelligently:
// Take into account the frequency of the clock + overhead, and space out the reads
// Or do something like "dual edge" statistics, where you query the stats from both rising and falling edges
// then make a decision (probably won't do much better against the last source of noise, but would do well for debouncing)
uint8_t total = 0;
uint8_t c = 0;
for ( ; c < 50; c++ )
if ( DATA_OUT & (1 << DATA_PIN) )
total++;
// Only use as a valid signal
if ( total >= 40 )
{
// Key isn't in the buffer yet
if ( c == KeyIndex_BufferUsed )
// Reset the scan counter, all the keys have been iterated over
// Ideally this should reset at 128, however
// due to noise in the cabling, this often moves around
// The minimum this can possibly set to is 124 as there
// are keys to service at 123 (0x78)
// Usually, unless there is lots of interference,
// this should limit most of the noise.
if ( positionCounter >= 124 )
{
bufferAdd( keyValue );
positionCounter = 0;
// Only send data if enabled
if ( KeyIndex_Add_InputSignal )
scan_sendData( KeyIndex_Add_InputSignal );
break;
// Clear key buffer
KeyIndex_BufferUsed = 0;
}
// Key Press Detected
else
{
char tmp[15];
hexToStr( positionCounter, tmp );
dPrintStrsNL( "Key: ", tmp );
// Key already in the buffer
if ( KeyIndex_Buffer[c] == keyValue )
break;
bufferAdd( positionCounter );
}
}
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;
}
// Wait until the next falling clock edge for the next DATA scan
currentWaveDone++;
}
// Error case (no key to release)
if ( c == KeyIndex_BufferUsed + 1 )
// Check if the clock de-synchronized
// And reset
if ( positionCounter > 128 )
{
char tmp[15];
hexToStr( positionCounter, tmp );
erro_dPrint( "De-synchronization detected at: ", tmp );
errorLED( 1 );
char tmpStr[6];
hexToStr( keyValue, tmpStr );
erro_dPrint( "Could not find key to release: ", tmpStr );
positionCounter = 0;
KeyIndex_BufferUsed = 0;
// A keyboard reset requires interrupts to be enabled
sei();
scan_resetKeyboard();
cli();
}
// Regardless of what happens, always return 0
return 0;
}
// Send data
@ -221,12 +232,12 @@ void scan_finishedWithUSBBuffer( void )
}
// Reset/Hold keyboard
// NOTE: Does nothing with the BETKB
// NOTE: Does nothing with the HP150
void scan_lockKeyboard( void )
{
}
// NOTE: Does nothing with the BETKB
// NOTE: Does nothing with the HP150
void scan_unlockKeyboard( void )
{
}
@ -234,6 +245,37 @@ void scan_unlockKeyboard( void )
// Reset Keyboard
void scan_resetKeyboard( void )
{
// TODO Determine the scan period, and the interval to scan each bit
info_print("Attempting to synchronize the keyboard, do not press any keys...");
errorLED( 1 );
// Do a proper keyboard reset (flushes the ripple counters)
RESET_PORT |= (1 << RESET_PIN);
_delay_us(10);
RESET_PORT &= ~(1 << RESET_PIN);
// Delay main keyboard scanning, until the bit counter is synchronized
uint8_t synchronized = 0;
while ( !synchronized )
{
// Read on each falling edge/after the falling edge of the clock
if ( !currentWaveDone )
{
// Read the current data value
if ( DATA_OUT & (1 << DATA_PIN) )
{
// Check if synchronized
// There are 128 positions to scan for with the HP150 keyboard protocol
if ( positionCounter == 128 )
synchronized = 1;
positionCounter = 0;
}
// Wait until the next falling clock edge for the next DATA scan
currentWaveDone++;
}
}
info_print("Keyboard Synchronized!");
}

4
Scan/HP150/setup.cmake
View file

@ -42,7 +42,7 @@ add_definitions( -I${HEAD_DIR}/Keymap )
#| Keymap Settings
add_definitions(
-DMODIFIER_MASK=hp150_ModifierMask
#-DKEYINDEX_MASK=hp150_ColemakMap
-DKEYINDEX_MASK=hp150_DefaultMap
-DKEYINDEX_MASK=hp150_ColemakMap
#-DKEYINDEX_MASK=hp150_DefaultMap
)