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msp430fr5969: spi_data_outlet_issue

sadasivam arumugam
Intellectual 940 points

Part Number: MSP430FR5969

Hi Sir,

I am developing a code based on SPI module. Now I am working on example codes related to spi(4 pin mode). My doubt is regarding, I am sending data(0x01) to slave and Echoed back to master with the same data. But in Logical Analyzer I have noticed the following data. When i Debugged, I got 0x01 in master and 0x80 in slave. Is there a problem being in my code or whether there is some other issue.(Note: A2 pin is not connected). If it is worked then i would like to interface the same uC with BLE.

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    TI__Guru**** 220847 points
    Hi sadasivam,

    What are your UC[A/B]xCTLW0 register settings and what slave device are you communicating with? The fact that you are getting a response means that the connections and timing are correct but some control bit is most likely misunderstood between devices. It could be the UCMSB bit since 0x80 is the reverse direction of 0x01. You could confirm this with further test data points.

    Regards,
    Ryan

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