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Problems with serial communication

Christian Konrad

I have implemented a new serial data transfer protocol in our 8051 system (80C552).

I tryed to write the received characters immediately back to the terminal with the following commands:

	ucrs232_buffer[ucrec_count] = S0BUF;
	S0BUF = ucrs232_buffer[ucrec_count];
This two command lines are performed in the ISR. I wrote 16 chars and got back 13 completly different ones.

If I send a message from the 80C51 to the terminal its correct! Also the command from the terminal is correct.

What can be the reason for this wrong reception?

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  • 0 in reply to Mark Odell

    you wrote:"Writing the chars back to S0BUF was just inserted for test. If I do not use this line, I get also a wrong message"

    If this is a fact, then writing back is not your problem, you must be writing to the buffer somewhere else.

    Erik

    also when writing, you must cleat TI in the ISR.

Reply
  • 0 in reply to Mark Odell

    you wrote:"Writing the chars back to S0BUF was just inserted for test. If I do not use this line, I get also a wrong message"

    If this is a fact, then writing back is not your problem, you must be writing to the buffer somewhere else.

    Erik

    also when writing, you must cleat TI in the ISR.

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