LPC1769 work under debug but not in stand alone mode.

[walterperesson]

Hi,

I have a problem with a custom board using a LPC1769 running freertos.

Our device has two boards: a master with a LPC4088 and a slave with a LPC1769. The master queries the slave about some variables by UART port. Under debugging the communication is perfect, there is not any CRC error, then in stand alone mode AND after power cycling the LPC1769, the LPC4088 master board misses almost all the replies from slave.

What could be wrong? Why there's a different behavior in stand alone mode?

[kerryzhou]

Hello Walter Peresson,

   After you download the code to both LPC4088 and LPC1769.

  Please reset the slave at first, and reset the master later.

  Then check the communication again.

  If you still have problems, please use the logic analyzer or the oscilloscope to check the communication wave, just to find this problem is caused by  the master or the slave.

Please try it on your side.

If you still have question about it, please kindly let me know!

Have a great day,
Kerry

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