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MSP430F5172: Limitation to using both IR and UART on USCI A0

RodneyFarrow
Expert 4010 points
Part Number: MSP430F5172

HI Guys

Is there’s any limitation to using both IR and UART on USCI A0, on the MSP430F5172, since they both use the same interrupt vector(USCI_A0_VECTOR).?

Thanks

Regards

Rodney

  • 0
    TI__Guru 60361 points

    Hi Rodney,

    No limitations.  You will obviously have to manage the usage in software if using at the same time.  Curious about the application.   Is there a reason you chose the F5172 with only 1 USCI_A vs. other MSP430 MCUs that have 2?

  • 0 in reply to Dennis Lehman
    TI__Expert 4010 points

    HI Dennis 

    Its an existing old design.

    If they use both at the same time it means the software will have to manage both incoming comms from IR and UART. Since the incoming comms may happen at any time from either peripheral, there’s no effective way they can actually manage both in software since both share the same Rx register. So if both comms get received at exactly the same time, they will overwrite each other. Or is there another way to manage it besides ensuring that the comms come in at predefined intervals?

    Thanks

    Rodney

  • 0 in reply to RodneyFarrow
    TI__Guru 60361 points

    Hi Rodney,

    I assume the UART is a UART from another MCU or device and the IR is a decoder, so electrically, how do you bring the outputs together into one MSP UART RX, and how do you control which device to send data to when it goes out the MSP UART TX?

  • 0 in reply to Dennis Lehman
    TI__Guru 60361 points

    Hi Rodney,

    I haven’t heard from you for a couple of days now, so I’m assuming you were able to resolve your issue.
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