async.c

来自「rt 7520采集卡 linux驱动源代码」· C语言 代码 · 共 141 行

/*
	FILE NAME: async.c

	FILE DESCRIPTION:

		Demonstrates asynchronous notification of interrupts.  This
		program sets up a function to be called when interrupt
		notification occurs and the board is programmed to interrupt on
		every FIFO write.  User output 0 signal (pin number 55) is
		toggled during every notification.

		100 samples are initiated.  When 20 samples have been started,
		notification is disabled.  When 50 samples have been started,
		notification is enabled again.  When 90 samples have been
		started, interrupts are disabled.  A total of 60 events will
		happen in this scenario.

		When each sample is initiated, the number of samples, number of
		notifications, and interrupt status are printed.

		All acquired samples are printed 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 <unistd.h>	//usleep
#include <stdlib.h>	//exit
#include <errno.h>	//errno
#include "dm7520_library.h"

int hb=0;
FILE * infile;
int counter = 0;
uint16_t itStat = 0;
int devno; //device handler

void do_async_stuff(void)
{
 WriteUserOutput7520(devno,hb);
 hb^=1;
 counter++;
 GetITStatus7520(devno, &itStat);
}

int main(int argc, char * argv[])
{
 int cnt,i;
 uint16_t fifostat;
 short sample;
 int channel;
 cg_entry_t cgl;
 uint16_t *z=(uint16_t*)&cgl;
 uint8_t	bus_master;
 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 != 0)
    printf("Busmaster card\n");
 else
    printf("Non-busmaster card\n");

 InitBoard7520(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);

 SetUout0Source7520(devno,UOUT_SOFTWARE);
 SetUout1Source7520(devno,UOUT_ADC);

 SetNotification7520(devno,(unsigned short) IRQS_ADC_FIFO_WRITE,do_async_stuff);

 cnt=100;
 for (i=0;i<cnt;i++)
   {
    
    StartConversion7520(devno);
//	usleep(100000);
	usleep(1000);
    printf("Sampling: %d counter=%d ITstatus=%X\n",i, counter,itStat);fflush(stdout);
    itStat = 0;
	
    if (20==counter) UnSetNotification7520(devno);
    if(50==i) SetNotification7520(devno,(unsigned short) IRQS_ADC_FIFO_WRITE,do_async_stuff);
    if (90==i) SetITMask7520(devno,0);             // disable interrupts
   }
    printf("\n");   

 i=1;
 IsADFifoEmpty7520(devno, &fifo_empty);
 while(fifo_empty == 0)
   {
    ReadADDataWithMarker7520(devno, &sample);
    sample/=8;
    printf("%-5d ",sample);
    if (0==i%8)
      printf("\n");
    i++;
    IsADFifoEmpty7520(devno, &fifo_empty);
   }

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

 fclose(infile);
 return(0); 
}