scan_n.c

rt采集卡dos下dm6430驱动源代码

/***************************************************************************

	FILE NAME: SCAN_N.C

	FILE DESCRIPTION: SCAN_N (Scanning Multiple Channels)

	 Sample program that demonstrates how to perform an analog to digital
	 conversion on multiple channels using the channel gain table. Scan mode
	 means that the time between two samples is equally divided among the
	 channels.

	 Sample program that uses the Pacer Clock and the channel gain table
	 to acquire data on several channels.

	 While the measurement is running the acquired data on the A/D channels
	 is displayed on the screen, one line with every sample.

	PROJECT NAME: SCAN_N (Part of DM6430 DOS Driver)

	DRIVER VERSION: 1.1

	COMPILER: Borland C++ 3.1

	TARGET: Real-Mode DOS

	Copyright 2003 RTD Embedded Technologies

***************************************************************************/

#include <conio.h>
#include <dos.h>

#include "drvr6430.h"
#include "dio5812.h"

/***************************************************************************
  Defines

  Change these constants to alter the program parameters.
****************************************************************************/

#define BASE_ADDRESS     768           // Base address of DM6430.
#define FIRST_CHAN       0             // First channel to scan.
#define NUM_OF_CHAN      8             // Number of selected channels.
#define GAIN             0             // Global gain.
#define RATE             20.0          // Sample rate in [Hz].
#define ADSLOPE    (65536.0/20.0)      // Number Bits divided by AD Range.


/***************************************************************************
  SetProgramScreen()

  The SetProgramScreen() function initializes the screen.
***************************************************************************/

void SetProgramScreen(void)
{
  int i;

  clrscr();

  // Print header and footer.
  gotoxy( 1, 1); cprintf(TitleString6430());
  gotoxy(50, 1); cprintf("Multi Channel Scan");
  gotoxy( 1,25); cprintf("Press any key to exit. . .");

  // Prepare window to print data and print header above the samples.
  window(1, 3, 80, 23);
  gotoxy( 7, 3);
  for (i = 0; i < NUM_OF_CHAN; i++)
	 cprintf("  CH %d  ", FIRST_CHAN + i + 1);
} //SetProgramScreen


int main(void)
{
  unsigned    i;                       // Sample counter.
  float       Data;                    // Store acquired data
  int         ADData;

  ADTableRow ADTable[NUM_OF_CHAN];

  SetProgramScreen();

  SetBaseAddress(BASE_ADDRESS);
  InitBoard6430();                     // Board initializing.
  SetPacerClock6430(RATE*NUM_OF_CHAN); // Initialize pacer clock.

  for (i=0;i<NUM_OF_CHAN;i++) {        // Set Up AD Table
	  ADTable[i].Channel=FIRST_CHAN+i;
	  ADTable[i].Gain=0;
	  ADTable[i].Skip=0;
	  ADTable[i].Se_Diff=0;
	  ADTable[i].Pause=0;
  }
  SetStartTrigger6430(0);              // Start Trigger = Software
  SetStopTrigger6430(0);               // Stop Trigger = Software
  SetConversionSelect6430(1);          // Conversion Select = Pacer Clock
  LoadADTable6430(NUM_OF_CHAN,ADTable);// Load AD Table
  EnableTables6430(1,0);               // Enable AD Table
  ClearADFIFO6430();                   // Clear FIFO

  i = 0;                               // Clear sample index.
  gotoxy(7, 5);

  StartConversion6430();               // Start conversion.

  while ( !kbhit() ) {                 // Run until any key pressed

	 while ( IsADFIFOEmpty6430() );     // Wait until data is ready to read

	 ADData = ReadADData6430();         // Read acquired data and convert it
	 Data = ADData / ADSLOPE;           // to voltages.

	 cprintf("%6.3f  ", Data);          // Display 'Data'.

	 if ((++i % NUM_OF_CHAN) == 0)
		gotoxy(7, 5 + i/NUM_OF_CHAN);    // Next line.

	 if (i == (10 * NUM_OF_CHAN)) {
		i = 0;                           // Next screen.
		gotoxy(7, 5);
	 } //if
  } //while
  getch();                             // Get the pressed character.

  window(1,1,80,25);                   // Reset original screen coordinates,
  clrscr();                            // and clear the screen.
  return 0;
} //main