ad.c

来自「rt 7520采集卡 linux驱动源代码」· C语言 代码 · 共 107 行

/*
	FILE NAME: ad.c

	FILE DESCRIPTION:

		Sample program for AD conversion using pacer clock without DMA.
		Samples are read from the specified channel and then shown on
		the screen

		It is not recommended to use this program to get more samples
		than FIFO size. For more samples, use DMA as it is shown in
		"ad_dma" program.

	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 512

int main(int argc, char * argv[])
{
 FILE * infile;		
 int16_t buffer[BUFSIZE]; //input buffer
 int cnt;
 int i;
 uint16_t fifostat;
 int devno;	//device handler
 // short sample;
 int channel;
 cg_entry_t cgl;
 uint16_t *z=(uint16_t*)&cgl;
 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");
 else
    printf("Non-busmaster card\n");

 InitBoard7520(devno);


 ClearADFifo7520(devno);
 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);
 SetPacerRate7520(devno, 1000000);
 SetConversionSelect7520(devno, ADC_START_PCLK);
 
 StartPacer7520(devno);

 cnt=ReadData7520(devno, buffer,BUFSIZE);
 if (cnt!=BUFSIZE) printf("error while reading\n");
 StopPacer7520(devno);
 printf("Raw samples:");
 for (i=0;i<(cnt);i++)
   {
    if (0==i%8) printf("\n");
    printf("%5d ", buffer[i]/8);
 //need to devide by 8 to remove markers
   }
 printf("\n");

 fclose(infile);
 return(0); 
}