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CCS/MSP430F5529: How to use SPI and UART together without data lose?

harshana rathnayake
Intellectual 355 points
Part Number: MSP430F5529


Tool/software: Code Composer Studio

I'm using MSP430F5529 mcu. there is spi communication for collecting data from sensor. also there is another mcu which is c2000 and it requests data from MSP430 through uart. uart data collect using receiver interrupt. some times uart interrupt the spi data reading. then it records error data. is there any suggestion to make it error free?

  • 0
    TI__Guru 71216 points

    Hello harshana,

    If we look at the interrupt vector table for the MSP430F5529, depending on which combination of USCI_Ax and USCI_Bx you use, yes the UART will have priority over the SPI.

    Not sure how you implement your functions to read the SPI and UART but one method to prevent UART from interrupting the SPI is to temporarily disable the UART interrupt(s).

    Else you could set a flag variable that indicates whe the SPI is busy and the UART function could then wait until SPI is not busy.

  • 0 in reply to Dennis Lehman
    TI__Guru 71216 points

    Hello harshana,

    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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