Specifications

Comedi
30 / 148
int ret;
unsigned int d = 0;;
static const unsigned rtsi_subdev = 10;
static const unsigned rtsi_clock_line = 7;
memset(&configCmd, 0, sizeof(configCmd));
memset(&configData, 0, sizeof(configData));
configCmd.insn = INSN_CONFIG;
configCmd.subdev = rtsi_subdev;
configCmd.chanspec = 0;
configCmd.n = 3;
configCmd.data = configData;
configCmd.data[0] = INSN_CONFIG_SET_CLOCK_SRC;
configCmd.data[1] = NI_MIO_PLL_RTSI_CLOCK(rtsi_clock_line);
configCmd.data[2] = 100; /
*
need to give it correct external clock period
*
/
ret = comedi_do_insn(dev, &configCmd);
if(ret < 0){
comedi_perror("comedi_do_insn: INSN_CONFIG");
exit(1);
}
/
*
configure RTSI clock line as input
*
/
ret = comedi_dio_config(dev, rtsi_subdev, rtsi_clock_line, INSN_CONFIG_DIO_INPUT);
if(ret < 0){
comedi_perror("comedi_dio_config");
exit(1);
}
/
*
Configure RTSI lines we are using for AI signals as inputs.
*
/
ret = comedi_dio_config(dev, rtsi_subdev, 0, INSN_CONFIG_DIO_INPUT);
if(ret < 0){
comedi_perror("comedi_dio_config");
exit(1);
}
ret = comedi_dio_config(dev, rtsi_subdev, 1, INSN_CONFIG_DIO_INPUT);
if(ret < 0){
comedi_perror("comedi_dio_config");
exit(1);
}
ret = comedi_dio_config(dev, rtsi_subdev, 2, INSN_CONFIG_DIO_INPUT);
if(ret < 0){
comedi_perror("comedi_dio_config");
exit(1);
}
}
int comediSlaveStart(comedi_t
*
dev){
comedi_cmd cmd;
unsigned int nChannels = 8;
double sampleRate = 50000;
unsigned int chanList[8];
int i;
// Setup chan list
for(i = 0; i < nChannels; i++){
chanList[i] = CR_PACK(i, 0, AREF_GROUND);
}
// Set up command
memset(&cmd, 0, sizeof(cmd));
ret = comedi_get_cmd_generic_timed(dev, subdevice, &cmd,
(int)(1e9/(nChannels
*
sampleRate)));
if(ret<0){
printf("comedi_get_cmd_generic_timed failed\n");
return ret;