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Struggling to use the freeRTOS SPI slave and master example programs

Robert Gardner
Intellectual 290 points

Part Number: MSP432E401Y
Other Parts Discussed in Thread: SYSCONFIG

Hello all,

I have not edited either example at all. I am attempting to make an MSP432E401Y communicate as a slave via SPI to an MSP432R401. I have downloaded the appropriate example code for each board (spimaster_MSP432P401R_freeRTOS_ccs and spislave_MSP432E401Y_freeRTOS_ccs) but I am unable to get these examples functioning.

The issue that I am having is with the following line:

And then I have the same problem with the corresponding line on the slave side

I am hooking the MSP to one another directly (no extra components, just wires connecting pins) as follows:

MSP432P -> MSP432E

P5.7 -> PM3

P6.0 -> PQ0

P2.5 -> PD3

P2.6 -> PD1

P2.7 -> PD0

P2.3 -> PD2

This is the pinout I have pulled from the sysconfig file in each example.

The while loop just gets completely blown through. I have tested it a number of different ways and this is the best explanation of what I've found.

If I hook up the each of the MSP to one another, the while loop gets blown through.

If I leave one MSP sitting with no connections whatsoever, the while loop gets blown through.

If I am probing the CONFIG_SPI_MASTER_READY or CONFIG_SPI_SLAVE_READY (depending on which board I am testing) AND I do not connect the board I am testing to anything else, it is sitting with no connections whatever, it will wait at the while loop as it should.

As mentioned above, I have not altered the code from the examples provided in the TI Resource Explorer in any way.

This is a very strange problem and I'm completely at a loss as to what may be causing it. I have tested this issue on multiple MSP units and it remains consistent. Any help would be appreciated.

Thank you

  • 0
    TI__Mastermind 30426 points

    Hi Robert，

    It seems that the error screenshot you uploaded has a problem and is not displayed. Can you upload it again?

    Best Regards

    Johnson

  • 0 in reply to Johnson He
    Intellectual 290 points

    My mistake. First time poster.

    The problematic code master side.

    The problematic code slave side.

    Since my post yesterday I have uncovered something new that I suspect may be the issue. Sometimes when I pause the program while debugging, I get the following dialogue window.

    I don't know what this filepath is, it doesn't match anything on my computer and I do not (to my knowledge) have this GPIOMSP432.c file. It would make sense that missing this file would cause the issues I'm seeing, I think.

    Thank you,

    Robert

  • 0 in reply to Robert Gardner
    Guru 103215 points

    Typo Alert:

    > while (GPIO_Read (CONFIG_SPI_SLAVE_READY == 0)) {}  // (I hope I typed that right)

    Try:

    > while (GPIO_Read (CONFIG_SPI_SLAVE_READY) == 0) {}  // 

    In my copy of spimaster.c, this is what line 124 looks like.

  • 0 in reply to Bruce McKenney
    Intellectual 290 points

    That was my mistake, I had to throw those two lines in. I changed them a bit while trying to debug and had to throw them back in to retake the screenshots. I didn't run the code with that error present

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