etrig.c

rt 7520采集卡 linux驱动源代码

/*
	FILE NAME: etrig.c

	FILE DESCRIPTION:

		Demonstrates usage of an external trigger.

		Digital I/O port 1 bit 0 (pin number 46) is used to generate
		the external trigger.  This pin must be connected to the
		Trigger Input pin (pin number 47).

		A/D conversion starts on an external trigger.  A positive edge
		starts conversion unless 'n' is passed in as the second command
		line argument, which means a negative edge starts conversion.

	PROJECT NAME: Linux DM7520 Driver, Library, and Example Programs

	PROJECT VERSION: (Defined in README.TXT)

	Copyright 2004 RTD Embedded Technologies, Inc.  All Rights Reserved.
*/

#include <stdio.h>	//printf
#include <stdlib.h>	//exit
#include <errno.h>	//errno
#include <slang/slang.h>	//for anykey
#include <unistd.h>	//sleep
#include "dm7520_library.h"


int anykey(void) {
    int x;
    SLang_init_tty(-1, 1, 1);
    x = SLang_getkey();
    SLang_reset_tty();    
    return x;
}

int main(int argc, char * argv[])
{
 FILE * infile;		
 int devno;	//device handler
 char negative = 0;

 cg_entry_t cgl;
 uint16_t *z=(uint16_t*)&cgl;
 uint8_t	fifo_empty;

 if (argc<2) {fprintf(stderr,"Usage: %s <device> [n]\n",argv[0]);exit(1);}

 if (NULL==(infile=fopen(argv[1],"r"))) 
   {
    fprintf(stderr,"Cannot open file, errno=%d\n",errno);
    perror("Error is");
    exit(2);
   }

 if (argc==3) if (argv[2][0]=='n') negative = 1;	//use negative edge of external trigger
 


 devno = fileno(infile);		// get device handler

 InitBoard7520(devno);


 ClearADFifo7520(devno);

 EnableCGT7520(devno,0);
 
 SetupCgtRow7520(&cgl,0,0,0,0,0,0,0,0,0);
 
 WriteCGTLatch7520(devno,(uint16_t)*z);

 SetDIO1Direction7520(devno, 1);	//set port1 to output
 WriteDIO17520(devno,0); 
		// init DIO


 SetPacerStart7520(devno, PCLK_START_ETRIG);	//pacer start on external trigger
 SetEtrgPolarity7520(devno, negative);		//set ext. trigger polarity
 if (negative) printf ("Using external trigger, negative edge\n");
 else printf ("Using external trigger, positive edge\n");
 SetPacerStop7520(devno, PCLK_STOP_SOFTWARE);
 SetPacerRate7520(devno, 1000000);
 SetConversionSelect7520(devno, 1);
	//pacer clock
 StartPacer7520(devno);	//arm the trigger
 
 printf("Press any key for positive edge of external trigger\n");
 anykey();
 WriteDIO17520(devno,1); 

 usleep(10);

 IsADFifoEmpty7520(devno, &fifo_empty);
 if (fifo_empty){ 
	printf("Conversion is not started\n");
	printf("Press any key for negative edge of external trigger\n");
	anykey();
	WriteDIO17520(devno,0); 
	usleep(10);
	IsADFifoEmpty7520(devno, &fifo_empty);
	if (fifo_empty){
		printf("Conversion is not started\n");
	}
	else {
		printf("Conversion is started\n");
	}
 }
 else {
	 printf("Conversion is started\n");
 }
 printf("Press any key to exit the program\n");
 anykey();

 fclose(infile);
 return(0); 
}