Part Number: OMAPL138B-EP
Tool/software: Code Composer Studio
It is to inform you that, while implementing BPSK transmitter and receiver using CCS(Code Composer Studio),we are getting the following errors.
-#10234-D unresolved symbols remain
-unresolved symbol _main, first referenced in C:\ti\ccsv5\tools\compiler\c6000_7.4.4\lib\rts6740.lib<args_main.obj>
Herewith we attach the implemented code as well as the snapshot of the problems.
Therefore we would like to request you to resolve the issues as soon as possible and mail us in the given mail id.
// Welch, Wright, & Morrow,
// Real-time Digital Signal Processing, 2011
///////////////////////////////////////////////////////////////////////
// Filename: rectangularBPSK_ISRs.c
//
// Synopsis: Interrupt service routine for codec data transmit/receive
//
///////////////////////////////////////////////////////////////////////
#include "DSP_Config.h"
#include <stdlib.h> /* needed to call the rand() function */
// Data is received as 2 16-bit words (left/right) packed into one
// 32-bit word. The union allows the data to be accessed as a single
// entity when transferring to and from the serial port, but still be
// able to manipulate the left and right channels independently.
#define LEFT 0
#define RIGHT 1
volatile union {
Uint32 UINT;
Int16 Channel[2];
} CodecDataIn, CodecDataOut;
/* add any global variables here */
Int32 counter = 0; // counter within a symbol period
Int32 symbol; // current bit value ... 0 or 1
Int32 data[2] = {-20000, 20000}; // table lookup bit value
Int32 x; // bit's scaled value
Int32 samplesPerSymbol = 20; // number of samples per symbol
Int32 cosine[4] = {1, 0, -1, 0}; // cos functions possible values
Int32 output; // BPSK modulator's output
interrupt void Codec_ISR()
///////////////////////////////////////////////////////////////////////
// Purpose: Codec interface interrupt service routine
//
// Input: None
//
// Returns: Nothing
//
// Calls: CheckForOverrun, ReadCodecData, WriteCodecData
//
// Notes: None
///////////////////////////////////////////////////////////////////////
{
/* add any local variables here */
// if(CheckForOverrun())// overrun error occurred (i.e. halted DSP)
// return; // so serial port is reset to recover
// CodecDataIn.UINT = ReadCodecData(); // get input data samples
/* add your code starting here */
// I added my rectangular BPSK routine here
if (counter == 0) { // time for a new bit
symbol = rand() & 1; // equivalent to rand() % 2
x = data[symbol]; // table lookup of the next data value
}
output = x*cosine[counter & 3]; // calculate the output value
if (counter == (samplesPerSymbol - 1)) { // end of the symbol
counter = -1;
}
counter++;
CodecDataOut.Channel[LEFT] = output; // setup the LEFT value
CodecDataOut.Channel[RIGHT] = output; // setup the RIGHT value
// end of my rectangular BPSK routine
/* end your code here */
//WriteCodecData(CodecDataOut.UINT); // send output data to port
}
