mcbsp.c

rt 7520采集卡 linux驱动源代码

/*
	FILE NAME: mcbsp.c

	FILE DESCRIPTION:

		Demonstrates usage of the Multi-channel Buffered Serial Port
		(McBSP).

		The following connections must be made before running this
		program:
			* P4 pin 4 ==> P4 pin 8
			* P4 pin 7 ==> P4 pin 9
			* P4 pin 3 ==> P4 pin 5 & P3 pin 1
			* CN2 pin 1 ==> CN2 pin 23
			* CN2 pin 31 ==> CN2 pin 32
			* CN2 pin 33 ==> CN2 pin 34
			* CN2 pin 35 ==> CN2 pin 36
			* CN2 pin 37 ==> CN2 pin 38
			* CN2 pin 39 ==> CN2 pin 40
			* CN2 pin 41 ==> CN2 pin 42
			* CN2 pin 43 ==> CN2 pin 44
			* CN2 pin 45 ==> CN2 pin 46

		The output sine wave appears on CN2 pin 21.

	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 <math.h>	//sin
#include <slang/slang.h>	//anykey
#include "dm7520_library.h"


//suggests to press any key and returns number of key pressed
int anykey(void) {
    int x;
    printf("\nPress any key to continue\n");	
    SLang_init_tty(-1, 1, 1);
    x = SLang_getkey();
    SLang_reset_tty();    
    return x;
}

int main(int argc, char* argv[])
{
 FILE * infile;
 int board_idx;
 int i = 0;
 float actual=0.;
 int ret;

 if (argc<2) {fprintf(stderr,"Usage: %s <device>\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);
   }

 board_idx = fileno(infile);		// get device handler

	 ret = InitBoard7520(board_idx);	// init board

	// The A to D conversion is triggered by the pacer clock.
	//	The A to D data will be sent out over the serial port.

	SetChannelGain7520(board_idx, 0, 0, 0, 0, 0);  // Load Channel Latch.
	EnableCGT7520(board_idx,0 );	//	Enable Channel Gain Table
	EnableCGTDigital7520(board_idx, 0);	// Disable Digital Table

	SetDIO0Direction7520(board_idx, 0);	// set port 0 to input
	SetDIO1Direction7520(board_idx, 1);	// set port 1 to output

// as far DIO0 and DIO1 connected to each other writing 0 to port1 will set bit D2 of
//	input Data marker to 0 so McBSPDA will write to DA1
	WriteDIO17520(board_idx, 0);

	 SetPacerClock7520(board_idx, PCLK_START_SOFTWARE, PCLK_STOP_SOFTWARE,
			PCLK_NO_REPEAT, PCLK_INTERNAL, 10000);
	 SetConversionSelect7520(board_idx, ADC_START_PCLK);   // Conversion Select =  PCLK

	ClearADFifo7520(board_idx); // Clear the fifo

	// The D to A conversion is triggered by the Syncbus.
	//	When the syncbus is pulsed, the D to A will send out the data
	//	on the serial port.

	// Disable SyncBuses on DM7520
	EnableSbus07520(board_idx, 0);
	EnableSbus17520(board_idx, 0);
	EnableSbus27520(board_idx, 0);



	// DM7520 McBSP setup
	McBSPADControl7520(board_idx, 1);	// Enable McBSP A/D FIFO Control
	McBSPDAControl7520(board_idx, 1);	// Enable McBSP D/A FIFO Control

	 // start
	ClearADFifo7520(board_idx);
	ClearDAC1Fifo7520(board_idx);
	ClearDAC2Fifo7520(board_idx);

// Load Sine wave to DAC2 FIFO
	 for (i=0;i<1024;i++)
	 {
		 LoadDAC27520(board_idx,2047.0 * sin(i*(2*M_PI/1024)));
	 }

	// D/A setup
	SetupDAC7520(board_idx, DM7520_WRITE_DA1, AOUT_BIP5, DAC_CYCLE_SINGLE, DAC_START_SBUS0);
	 ret = SetDACRateF7520(board_idx,100000.,0,&actual);
	 if (ret!=0) printf("Error in SetDACRateF7520 ret=%d\n", ret);
	 printf("Dac rate = %10.3f\n", actual);
	 SetupDAC7520( board_idx, DM7520_WRITE_DA2, AOUT_BIP5, DAC_CYCLE_MULTI, DAC_START_SOFTWARE );

	 SetDAC2Start7520(board_idx,DAC_START_DAC_CLK);


	DACClockFreeRun7520(board_idx,1);


	EnableSbus07520(board_idx, 1);
	SetSbus0Source7520(board_idx,SBUS0_UTC2);
	SetUtc2Clock7520 (board_idx, CUTC2_8MHZ);
	SetupTimerCounter7520(board_idx,TC_UTC2,M8254_SQUARE_WAVE,10);//was 10

	 StartPacer7520(board_idx);

	 // stop
	 anykey();
	 StopPacer7520(board_idx);
	 SetDAC2Start7520(board_idx,DAC_START_SOFTWARE);
	McBSPADControl7520(board_idx, 0);
	McBSPDAControl7520(board_idx, 0);
	EnableSbus07520(board_idx, 0);

	 LoadDAC17520(board_idx, 0);
   LoadDAC27520(board_idx, 0);
    UpdateAllDAC7520(board_idx);
   return 0;
} // mcbsp_test