• State
  • Locked Locked
  • Replies 4 replies
  • Subscribers 79 subscribers
  • Views 470 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430F5529: SPI Communication

Snehal Deshmukh
Prodigy 50 points

Part Number: MSP430F5529

I am trying to implement SPI  for block transfer using MSP430F5529 as Master and TM4C1924NCPDT as slave.

What are the factors I need to consider for this. I am not able to receive data from slave.

  • 0
    TI__Intellectual 2115 points

    Hi Snehal,

    You need to notice that SPI slave can't send data actively -- master device initiates a communication and slave sends data at the same time. So you need to make sure every communication is started by master device.

    You may refer to some devices (such as standalone ADC/sensor/etc.) which have an SPI interface for configuration.

  • 0 in reply to Harry Qiu
    Prodigy 50 points
    Thanks Harry.
    But how can I use DMA and micro DMA in this case for block transfer?
  • 0 in reply to Snehal Deshmukh
    TI__Intellectual 2115 points

    Hi Snehal,

    Since I'm not familiar with TM4C devices, I can't give much suggestion on that side with micro DMA. But for MSP430F5529, I suggest you to use "single transfer" mode in the DMA, and use UCA/UCBxTXIFG/RXIFG as the trigger source, as there isn't any buffer in the SPI and you need to send/read out the data before next arriving.

    For the "single transfer" mode, you may refer to chapter 11.2.2.1 in the F5529's User's Guide. And also see below table captured from the datasheet for the trigger source.

    Moreover, though the DMA mode is "single transfer", it still transfers a "block" of data in the SPI communication unless something interrupts it (such as other interrupt, CPU acitivities).

    Regards,

    Harry

  • 0 in reply to Snehal Deshmukh
    TI__Intellectual 2115 points

    Hi Snehal,

    Since I'm not familiar with TM4C devices, I can't give much suggestion on that side with micro DMA. But for MSP430F5529, I suggest you to use "single transfer" mode in the DMA, and use UCA/UCBxTXIFG/RXIFG as the trigger source, as there isn't any buffer in the SPI and you need to send/read out the data before next arriving.

    For the "single transfer" mode, you may refer to chapter 11.2.2.1 in the F5529's User's Guide. And also see below table captured from the datasheet for the trigger source.

    Moreover, though the DMA mode is "single transfer", it still transfers a "block" of data in the SPI communication unless something interrupts it (such as other interrupt, CPU acitivities).

    Regards,

    Harry

**Attention** This is a public forum