// Reset the touch-screen interface.
//
static int elo_reset_touch(int fd)
{
fd_set set;
struct timeval timeout={0, 100000}; /* 0.1 seconds */
unsigned char packet[8];
/* Send reset command */
memset(packet, 0, 8);
packet[0]='R';
packet[1]=1; /* 0=Hard reset, 1=Soft */
elo_putbuf(fd, packet);
/* Wait for response */
FD_ZERO(&set);
FD_SET(fd, &set);
if(!select(fd+1, &set, NULL, NULL, &timeout))
return -1; /* no communications */
if(!elo_check_ack(fd))
return -1; /* no valid packet received */
/* Set the proper mode of operation:
Initial Touch, Range Checking, Calibration, Scaling, and Trim. */
elo_set_mode(fd,ELO_M_INITIAL|ELO_M_UNTOUCH|ELO_M_RANGECK,
ELO_M_CALIB|ELO_M_SCALE|ELO_M_TRIM);
/* Set scaling to 80 x 25 */
elo_set_scale(fd, 'X', elo_MINX, elo_SCREENWIDTH-1);
elo_set_scale(fd, 'Y', elo_MINY, elo_SCREENHEIGHT-1);
return 0;
}
// Set scaling info to touch device. Axis can be either 'X', 'Y', or 'Z'.
//
static int elo_set_scale(int fd, unsigned char axis, short low, short high)
{
unsigned char packet[8], *ptr;
if(axis < 'X' || axis > 'Z')
return -1;
memset(packet, 0, 8);
packet[0]='S';
packet[1]=axis;
packet[2]=low;
packet[3]=low >> 8;
packet[4]=high;
packet[5]=high >> 8;
/* send packet until proper ack is received */
while(1) {
elo_putbuf(fd, packet);
if(!(ptr=elo_getbuf(fd)))
return -2;
if(!strncmp("A0000", (char*)ptr, 5))
return 0;
}
}
// Reset the touch-screen interface.
//
static int elo_reset_touch(int fd)
{
unsigned char packet[8];
/* Send reset command */
memset(packet, 0, 8);
packet[0]='R';
packet[1]=1; /* 0=Hard reset, 1=Soft */
elo_putbuf(fd, packet);
/* Wait for response */
if(!elo_check_ack(fd))
return -1; /* no valid packet received */
/* Set the proper mode of operation:
Initial Touch, Range Checking, Calibration, Scaling, and Trim. */
elo_set_mode(fd,ELO_M_INITIAL|ELO_M_UNTOUCH|ELO_M_RANGECK,
ELO_M_CALIB|ELO_M_SCALE|ELO_M_TRIM);
/* Set scaling to 80 x 25 */
elo_set_scale(fd, 'X', elo_MINX, elo_SCREENWIDTH-1);
elo_set_scale(fd, 'Y', elo_MINY, elo_SCREENHEIGHT-1);
return 0;
}
// Set scaling info to touch device. Axis can be either 'X', 'Y', or 'Z'.
//
static int elo_set_scale(int fd, unsigned char axis, short low, short high)
{
unsigned char packet[8], *ptr;
if(axis < 'X' || axis > 'Z')
return -1;
memset(packet, 0, 8);
packet[0]='S';
packet[1]=axis;
packet[2]=low;
packet[3]=low >> 8;
packet[4]=high;
packet[5]=high >> 8;
/* send packet until proper ack is received */
while(1) {
elo_putbuf(fd, packet);
int ret = elo_check_ack(fd);
if( ret == 1 ) // OK
return 0;
if( ret == 0 ) // No receive
return -2;
}
}
// Set touch screen response packet mode (see #ifdefs in beginning of file).
//
static int elo_set_mode(int fd, unsigned char mode1, unsigned char mode2)
{
unsigned char packet[8], *ptr;
/* create packet */
memset(packet, 0, 8);
packet[0]='M';
packet[2]=mode1;
packet[3]=mode2;
/* send packet until proper ack is received */
while(1) {
elo_putbuf(fd, packet);
if(!(ptr=elo_getbuf(fd)))
return -2;
if(!strncmp("A0000", (char*)ptr, 5))
return 0;
}
}
// Set touch screen response packet mode (see #ifdefs in beginning of file).
//
static int elo_set_mode(int fd, unsigned char mode1, unsigned char mode2)
{
unsigned char packet[8];
/* create packet */
memset(packet, 0, 8);
packet[0]='M';
packet[2]=mode1;
packet[3]=mode2;
/* send packet until proper ack is received */
while(1) {
elo_putbuf(fd, packet);
int ret = elo_check_ack(fd);
if( ret == 1 ) // OK
return 0;
if( ret == 0 ) // No receive
return -2;
}
}