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Problems with serial communication

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 Christian Konrad over 23 years ago

Thank you every body for help! Program is working now and did it all the time! The prolem was the LabView Terminal program!! So it was not in my area. But in addition, with such problems always a learning effect is connected!

regards

Christian
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0 Christian Konrad over 23 years ago

Thank you every body for help! Program is working now and did it all the time! The prolem was the LabView Terminal program!! So it was not in my area. But in addition, with such problems always a learning effect is connected!

regards

Christian
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0 Richard Collett over 23 years ago in reply to Christian Konrad

When debugging serial comms, you always need to make sure that you are only debugging one end of the connection!
Working with multiple unknowns is a recipe for confusion.
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