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Synchronizing 2 MCU uart communication

Aamir Ali
Expert 2525 points
Other Parts Discussed in Thread: MSP430G2553

I have two msp430g2553 communicating via uart  ( rx, tx & gnd).

Problem is how to make sure that both are ready to do so.

First I made that unless one device send start byte(0x80), communication does not begin. But this does not work as I am not sure that which device is ready .

How to do that?

  • 0
    Guru 227245 points

    Both can send start byte in regular intervals until they receive a response byte. Once both got the expected response to their start byte, they know they are both up and running.

    You should design the communication in a way that the start byte (or "sync" byte, which fits better) can be sent at any time and will get the expected response. So you will avoid a lockup when one is already sending data when the other one is still expecting the sync response, and not data.

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