ad_dma.c

rt 7520采集卡 linux驱动源代码

/*
	FILE NAME: ad_dma.c

	FILE DESCRIPTION:

		AD conversion with pacer clock in DMA mode.  Samples are read
		into a buffer and then shown on the screen

	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"

#define BUFSIZE 20480
#define RATE 1000000    	//Pacer clock frequency in Hz

int main(int argc, char * argv[])
{
 FILE * infile;
 int16_t buffer [BUFSIZE];
 int cnt,i;
 uint16_t fifostat;
 int err;
 int devno;		//device handler
 float actualPacerRate;
 int channel;
 int useDMA  = 0;
 cg_entry_t cgl;
 uint16_t *z=(uint16_t*)&cgl;
 int errorCode=0;
 uint8_t	bus_master;



 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);		// get device handler

 IsBusMaster7520(devno, &bus_master);
 if (bus_master != 0) {
    printf("Busmaster card\n");
    useDMA=1;
 }
 else {
    printf("Non-busmaster card\n");
 }

 InitBoard7520(devno);     // init the board

 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);

 SetPacerStart7520(devno, PCLK_START_SOFTWARE);
 SetPacerStop7520(devno, PCLK_STOP_SOFTWARE);
 SetPacerRateF7520(devno, RATE,1,&actualPacerRate);
 printf("Pacer clock rate: %8.2f\n", actualPacerRate);
 SetConversionSelect7520(devno, ADC_START_PCLK);
 if (useDMA) {
     err = SetAD_DMAMode7520(devno,0);
    if (err < 0) printf("ERROR: could not set DMA mode \n");
    else printf("DMA started \n");
 }
 ClearADFifo7520(devno);
 StartPacer7520(devno);
 cnt=ReadData7520(devno, buffer,BUFSIZE);
 printf("got data\n");
 if (cnt !=BUFSIZE) {
	 GetErrorCode7520(devno, &errorCode);
	 printf("ERROR while reading data read byte = %d\nError code=%d\n", cnt, errorCode);
	 ClearErrorCode7520(devno);
 }
 StopPacer7520(devno);
 if (useDMA) {
    err = UnSetDMAMode7520(devno, 0);
    if (err<0) printf("ERROR: could not unset DMA mode \n");
 }
 printf("read %d samples\n", cnt);

 printf("Raw samples:");
 for (i=0;i<(cnt);i++)
   {
    if (0==i%8) printf("\n");
    printf("%5d ", buffer[i]>>3); // to delere data markers
   }
 printf("\n");




 fclose(infile);
 return(0);
}