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/*
Microtouch touch screen controller
Written by Mariusz Wojcieszek
Notes/ToDo:
- calibration mode (command CX)
- only tablet format is supported for returning touch screen state
*/
#include "driver.h"
#include "microtch.h"
static struct
{
UINT8 rx_buffer[16];
int rx_buffer_ptr;
emu_timer* timer;
UINT8 tx_buffer[16];
UINT8 tx_buffer_num;
UINT8 tx_buffer_ptr;
int reset_done;
int format_tablet;
int mode_inactive;
int mode_stream;
int last_touch_state;
int last_x;
int last_y;
microtouch_tx_func tx_callback;
microtouch_touch_func touch_callback;
} microtouch;
static int microtouch_check_command( const char* commandtocheck, int command_len, UINT8* command_data )
{
if ( (command_len == (strlen(commandtocheck) + 2)) &&
(command_data[0] == 0x01) &&
(strncmp(commandtocheck, (const char*)command_data + 1, strlen(commandtocheck)) == 0) &&
(command_data[command_len-1] == 0x0d) )
{
return 1;
}
else
{
return 0;
}
}
static void microtouch_send_format_table_packet(UINT8 flag, int x, int y)
{
microtouch.tx_buffer[microtouch.tx_buffer_num++] = flag;
// lower byte (7bits) of x coordinate
microtouch.tx_buffer[microtouch.tx_buffer_num++] = x & 0x7f;
// higher byte (7bits) of x coordinate
microtouch.tx_buffer[microtouch.tx_buffer_num++] = (x >> 7) & 0x7f;
// lower byte (7bits) of y coordinate
microtouch.tx_buffer[microtouch.tx_buffer_num++] = y & 0x7f;
// higher byte (7bits) of y coordinate
microtouch.tx_buffer[microtouch.tx_buffer_num++] = (y >> 7) & 0x7f;
};
static TIMER_CALLBACK(microtouch_timer_callback)
{
if ( microtouch.tx_buffer_ptr < microtouch.tx_buffer_num )
{
microtouch.tx_callback( machine, microtouch.tx_buffer[microtouch.tx_buffer_ptr++] );
if ( microtouch.tx_buffer_ptr == microtouch.tx_buffer_num )
{
microtouch.tx_buffer_ptr = microtouch.tx_buffer_num = 0;
}
return;
}
if ( (microtouch.reset_done == 0) ||
(microtouch.format_tablet == 0) ||
(microtouch.mode_inactive == 1) ||
(microtouch.mode_stream == 0) )
{
return;
}
// send format tablet packet
if ( input_port_read(machine, "TOUCH") & 0x01 )
{
int tx = input_port_read(machine, "TOUCH_X");
int ty = input_port_read(machine, "TOUCH_Y");
if ( microtouch.touch_callback == NULL ||
microtouch.touch_callback( machine, &tx, &ty ) != 0 )
{
ty = 0x4000 - ty;
microtouch_send_format_table_packet(0xc8, tx, ty);
microtouch.last_touch_state = 1;
microtouch.last_x = tx;
microtouch.last_y = ty;
}
}
else
{
if ( microtouch.last_touch_state == 1 )
{
microtouch.last_touch_state = 0;
microtouch_send_format_table_packet(0x88, microtouch.last_x, microtouch.last_y);
}
}
};
void microtouch_init(running_machine *machine, microtouch_tx_func tx_cb, microtouch_touch_func touch_cb)
{
memset(µtouch, 0, sizeof(microtouch));
microtouch.last_touch_state = -1;
microtouch.tx_callback = tx_cb;
microtouch.touch_callback = touch_cb;
microtouch.timer = timer_alloc(machine, microtouch_timer_callback, NULL);
timer_adjust_periodic(microtouch.timer, ATTOTIME_IN_HZ(167*5), 0, ATTOTIME_IN_HZ(167*5));
state_save_register_item(machine, "microtouch", NULL, 0, microtouch.reset_done);
state_save_register_item(machine, "microtouch", NULL, 0, microtouch.format_tablet);
state_save_register_item(machine, "microtouch", NULL, 0, microtouch.mode_inactive);
state_save_register_item(machine, "microtouch", NULL, 0, microtouch.mode_stream);
state_save_register_item(machine, "microtouch", NULL, 0, microtouch.last_touch_state);
state_save_register_item(machine, "microtouch", NULL, 0, microtouch.last_x);
state_save_register_item(machine, "microtouch", NULL, 0, microtouch.last_y);
state_save_register_item_array(machine, "microtouch", NULL, 0, microtouch.rx_buffer);
state_save_register_item(machine, "microtouch", NULL, 0, microtouch.rx_buffer_ptr);
state_save_register_item_array(machine, "microtouch", NULL, 0, microtouch.tx_buffer);
state_save_register_item(machine, "microtouch", NULL, 0, microtouch.tx_buffer_num);
state_save_register_item(machine, "microtouch", NULL, 0, microtouch.tx_buffer_ptr);
};
void microtouch_rx(int count, UINT8* data)
{
int i;
for ( i = 0; (i < count) && ((microtouch.rx_buffer_ptr + i) < 16); i++ )
{
microtouch.rx_buffer[i+microtouch.rx_buffer_ptr] = data[i];
microtouch.rx_buffer_ptr++;
}
if (microtouch.rx_buffer_ptr > 0 && (microtouch.rx_buffer[microtouch.rx_buffer_ptr-1] == 0x0d))
{
// check command
if ( microtouch_check_command( "MS", microtouch.rx_buffer_ptr, microtouch.rx_buffer ) )
{
microtouch.mode_stream = 1;
microtouch.mode_inactive = 0;
}
else if ( microtouch_check_command( "MI", microtouch.rx_buffer_ptr, microtouch.rx_buffer ) )
{
microtouch.mode_inactive = 1;
}
else if ( microtouch_check_command( "R", microtouch.rx_buffer_ptr, microtouch.rx_buffer ) )
{
microtouch.tx_buffer_num = 0;
microtouch.reset_done = 1;
}
else if ( microtouch_check_command( "FT", microtouch.rx_buffer_ptr, microtouch.rx_buffer ) )
{
microtouch.format_tablet = 1;
}
// send response
microtouch.tx_buffer[microtouch.tx_buffer_num++] = 0x01;
microtouch.tx_buffer[microtouch.tx_buffer_num++] = 0x30;
microtouch.tx_buffer[microtouch.tx_buffer_num++] = 0x0d;
microtouch.rx_buffer_ptr = 0;
}
};
INPUT_PORTS_START(microtouch)
PORT_START("TOUCH")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME( "Touch screen" )
PORT_START("TOUCH_X")
PORT_BIT( 0x3fff, 0x2000, IPT_LIGHTGUN_X ) PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(45) PORT_KEYDELTA(15)
PORT_START("TOUCH_Y")
PORT_BIT( 0x3fff, 0x2000, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(45) PORT_KEYDELTA(15)
INPUT_PORTS_END
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