>>>>> " Surya" == Surya P Kommareddy <[EMAIL PROTECTED]> writes:
Surya> ===================================
Surya> .......in RT_MODULE.C
Surya> ...
Surya> RTIME sampf;
Surya> outb(dat, LPT_PORT);
Surya> sampf=rt_get_time(); // store it in a variable
Surya> rtf_put(1, &sampf, sizeof(sampf)); // put the variable in a FIFO
Surya> ...
Surya> ..
Surya> =====================================
Surya> ..........IN US_APP.C
Surya> ...
Surya> ..
Surya> RTIME sampff;
Surya> unsigned long low_word; // declare low_word and high_word
Surya> unsigned long high_word;
Surya> read(rcv, &sampff, sizeof(sampff)); // read the data from the FIFO
Surya> low_word= low_word | sampff; // extract the low_word
Surya> sampff= sampff>>32; // shift by 32 bits
Surya> high_word= high_word | sampff; // extract the high_word
The low_word and high_word are not initialized in your use, so OR-ing
with them provides random data.
I think what you want here is probably this:
read(rcv, &sampff, sizeof(sampff)); // read the data from the FIFO
low_word= sampff; // Extract the low_word
sampff >>= (sizeof(unsigned long) * 8); // shift by the number
// of bits in the low-order
// half of sampff
// (zero filling the
// high-order half)
#if 0
/* The above line could be simplified for a known 32-bit machine as: */
sampff >>= 32;
#endif
high_word= sampff; // extract the high_word
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