// FREADER.CPP PC - TMS320C31 COMMUNICATION TO MULTIPLY TWO NUMBERS

#include <iostream.h>
#include "dsklib.h"	// contains several header files
#include "tidsp.h"	// contains memory address locations on DSP board
			//   on DSP board for status flags and registers

char DSK_APP[]="C31FILT.OUT";
char DSK_EXE[]="FREADER.EXE";

// default dsk communication routine
//   scans parallel port for dsk presence
//   if present, load dsk program
//
void config_dsk_for_comm() {

  //enumerated message for looking up messages
  //
  MSGS err;
  clrscr();
  Scan_Command_line(DSK_EXE);
  Detect_Windows();

  // Download the communications kernel
  //
  for(;;) {
    if(Init_Communication(10000) == NO_ERR) break;
    if(kbhit()) exit(0);
  }
  HALT_CPU();
  if((err=Load_File(DSK_APP,LOAD))!=NO_ERR) {
    cout << DSK_APP << " " << Error_Strg(err) << endl;
    exit(0);
  }
  RUN_CPU();  //DSK is initialized & able to communicate
  clrscr();
}

void main(int argc, char* argv[]) {

  // command line validation
  //
  if (argc < 3 || argc > 3) {
    cout << endl << "COMMAND LINE ERROR!!!" << endl;
    cout << "CORRECT USAGE IS: freader [input filename] ";
    cout << "[output filename]" << endl;
    exit(-1);
  }

  // declaration of file pointers
  //
  FILE *fp_1 = NULL, *fp_2 = NULL;

  // open and validate the input file for binary read operation
  //   open the output file for binary write operation
  //
  fp_1 = fopen(argv[1], "rb");
  fp_2 = fopen(argv[2], "wb");
  if (fp_1 == NULL) {
    cout << endl << "INPUT FILE NOT FOUND!" << endl;
    fclose(fp_1);
    fclose(fp_2);
    exit(-1);
  }

  // variables declaration
  //
  short int ibuf[1], obuf[1];         			// data buffer
  unsigned long ready, start, done, result, data;   	// comm variables
  unsigned long counter = 0;

  // configure and initialize the DSK board
  //
  config_dsk_for_comm();
  cout << "FREADER.EXE PROGRAM" << endl << endl;

  // obtain the samples 1 at a time into the buffer
  //
  while(fread(ibuf, 2, 1, fp_1) > 0) {

    // send the start signal
    //
    start = 0;
    putmem((unsigned long)START, 1, &start);
    
    // the dsp sets ready to false in response to hearing start
    //
    do {
      getmem((unsigned long)DSP_READY, 1, &ready);
    } while (ready == 0);

    // send input data
    //
    data = ibuf[0];
    putmem((unsigned long)IN, 1, &data);

    // pull the start flag high to tell the dsp to operate on the data
    //
    start = 1;
    putmem((unsigned long)START, 1, &start);

    // wait until the dsp signals it is done with the computation
    //
    do {
      getmem((unsigned long)DONE, 1, &done);
    } while (done == 0);

    // output the result and write to file
    //
    getmem((unsigned long)OUT, 1, &result);
    obuf[0] = (short int) result;
    fwrite(obuf, 2, 1, fp_2);

    // pull done low to signal dsp we are ready for the next iteration
    //
    done = 0;
    putmem((unsigned long)DONE, 1, &done);
    
    // display number of samples processed
    //
    counter++;
    if ((counter % 1000) == 0) {
      cout << "Samples processed = " << counter << endl;
    }
    
    // initialize and prepare for next iteration
    //
    ibuf[0] = 0;
    obuf[0] = 0;
    data = 0;
    result = 0;
  }
  
  // close the file pointers
  //
  fclose(fp_1);
  fclose(fp_2);
  
  // indicate completion of program and exit to prompt
  //
  cout << endl << endl;
  cout << "FREADER COMPLETED." << endl;
  cout << "TOTAL # OF SAMPLES PROCESSED IS " << counter << endl;
  
  return;
}