National Instruments PC-TIO-10 User Manual page 44

Chapter 4
void main(void);
void reset9513(unsigned int, unsigned int);
int square_wave(unsigned int, unsigned int, unsigned int, unsigned long,
unsigned long);
/* support functions
void reset9513(base_address, chip_offset)
unsigned int
{ unsigned int
int
/* set up the register addresses
cmd = base_address | chip_offset | cmd_port;
data = base_address | chip_offset | data_port;
/* reset the 9513
outp(cmd, 0xff);
for (ctr = 1; ctr <=5; ctr++)
{ outp(cmd, ctr);
outp(data, 0x00);
outp(data, 0x00);
outp(cmd, (ctr + 8));
outp(data, 0x03);
outp(data, 0x00);
}
outp(cmd, 0x5f);
}
int square_wave(base_address, counter, timebase, high_time, low_time)
unsigned int
unsigned long
{ unsigned int
/* check ranges
if ((counter < 1) || (counter > 10) ||
(timebase > 15) ||
(high_time < 1L) || (high_time > 65536L) ||
(low_time < 1L) || (low_time > 65536L))
return range_err;
/* set up the register addresses
© National Instruments Corporation
*/
base_address,
chip_offset;
cmd,
data;
ctr;
*/
base_address,
counter,
timebase;
high_time,
low_time;
cmd,
data,
mode;
*/
*/
/* reset the chip
/* select Counter Mode Register
/* store mode low-byte */
/* store mode high-byte
/* select Counter Load Register
/* store load low-byte */
/* store load high-byte
/* load all counters
*/
4-11
Programming
*/
*/
*/
*/
*/
*/
PC-TIO-10 User Manual