fifo.c

来自「rt 7520采集卡 linux驱动源代码」· C语言 代码 · 共 104 行

/*
	FILE NAME: fifo.c

	FILE DESCRIPTION:

		Demonstrates how to use software triggering to start an A/D
		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 "dm7520_library.h"

int main(int argc, char * argv[])
{
 FILE * infile;
 int devno;
 int samples_read;
 uint16_t fifostat;
 short sample;
 int channel;
 int i = 0;
 cg_entry_t cgl;
 uint16_t *z=(uint16_t*)&cgl;
 uint8_t	bus_master;
 uint8_t	fifo_full;
 uint8_t	fifo_empty;

 if (argc<2) {fprintf(stderr,"Usage: %s <device> [channel]\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)
   {
    channel=atoi(argv[2])-1;
   }
 else channel=0;

 if (channel<0 || channel>15)
   {
    fprintf(stderr,"%s: Channel number not in valid range (1..16).\n",argv[0]);
    exit(1);
   }

 devno = fileno(infile);

 IsBusMaster7520(devno, &bus_master);
 if (bus_master)
    printf("Busmaster card\n");
 else
    printf("Non-busmaster card\n");

 InitBoard7520(devno);
 ClearADFifo7520(devno);
 samples_read = 0;

 GetFifoStatus7520(devno, &fifostat);
 printf("\nFIFO status: %04X.\n",fifostat);

 EnableCGT7520(devno,0);

 SetupCgtRow7520(&cgl,channel,0,0,0,0,0,0,0,0);

 WriteCGTLatch7520(devno,(uint16_t)*z);


 IsADFifoFull7520(devno, &fifo_full);
 while (!fifo_full) {
	StartConversion7520(devno);
   samples_read++;
   IsADFifoFull7520(devno, &fifo_full);
 }

 IsADFifoEmpty7520(devno, &fifo_empty);
 while(fifo_empty == 0) {
 
	ReadADData7520(devno, &sample);
   printf("%-5d ",sample); i++;
   if (0==(i+1)%8)
   printf("\n");
   IsADFifoEmpty7520(devno, &fifo_empty);
 }
 printf("\nTotal FIFO size = %d\n", samples_read);

 GetFifoStatus7520(devno, &fifostat);
 printf("\nFIFO status: %04X.\n",fifostat);

 fclose(infile);
 return(0);
}