UART problem receives junk data

Legacy Legacy AirPrime modules
1

Hi,

i wrote uart1 program to receive 120 bytes data continuosly.
but randomly it receive only 3 junk bytes for some time.

i confirmed by debugging print the DataSize variable in Datahandler function.
it shows DataSize is 3 .that three bytes are junk data.

why it happens…?
could you please tell me where is the problem .?

regards
nagendra

2

Where is it receiving them from?
ie, what sends them?

How do you know that it’s not just the sender randomly sending 3 junk bytes?!

No - you haven’t given nearly enough information for that to be remotely possible.

However, in any such situation, there are these possibilities:

  1. The transmitter is transmitting rubbish
  2. The transmitter & receiver configurations do not match
  3. The data is being corrupted in transit (eg, faulty cable)
  4. The receiver has a hardware fult
  5. The receiver has a software bug
  6. Some combination of the above

You need to adopt a systematic, step-by-step process to pinpoint the problem(s)…