DRV8434S: SPI Example Not Working with F280025C Launchpad

Roi Gerstel

Part Number: DRV8434S

Hi!

I have been running SPI on drv8434s for a while now without issues, but with a non-TI board as the Controller.
We are now working on migrating the controller to TI, but have been unable insofar to get SPI to work as expected.
I have tried:

Taking a motor example (specifically 8136) + ignoring all the "motor" work + setting up the "raw" SPI as you do there. This has not worked at all.
Running several of the SPI samples - specifically the "best" results (no fault + coherent response) was received on the spi_ex6_eeprom sample, but I consistently receive 0x60, no matter what I send:
- Write --> read one byte --> read one byte: 0x60, 0x60.
- Write --> read 2 bytes at once: 0x6060
- Read one byte --> read one byte: 0x60, 0x60.
- Read 2 bytes at once: 0x6060

Is there some example somewhere with drv8434s over SPI?

Thanks!
Roi

6 months ago

0 Murugavel4637 6 months ago

TI__Mastermind 20775 points

Hi Roi,

The EVM for the DRV8434S uses an MS430F2617 TI MCU. The source code for the EVM can be downloaded from the EVM webpage https://www.ti.com/tool/DRV8434SEVM, https://dr-download.ti.com/software-development/support-software/MD-52mtcX0q61/01.00.00.0B/sloc370b.zip. The firmware project file can be opened with TI CCS.

The SPI protocol information is in the datasheet. I hope this will be helpful for you.

Regards, Murugavel

0 Roi Gerstel 6 months ago in reply to Murugavel4637

Prodigy 40 points

Hi Murugavel,

So if I understand you correctly, the firmware can be burnt onto a launchboard? Doesn't there need to be a specific hardware as well?
My problem is not the SPI itself, which as I said I am able to do without problems with a non-TI board on a non-TI environment, to the drv8434s. My problem is that the aforementioned SPI sample does not work as expected from the launchboard.

Thanks for the quick reply!
Roi

0 Roi Gerstel 6 months ago in reply to Roi Gerstel

Prodigy 40 points

Specifically, as said, I get a constant response 0x60 * N bytes for N bytes sent, no matter the order, length, or content of the data sent.

0 Murugavel4637 6 months ago in reply to Roi Gerstel

TI__Mastermind 20775 points

Hi Roi,

That sounds like a SPI setting or protocol mismatch. For those specific sample code support I'll forward your post to C2000 E2E forum. Thanks.

Regards, Murugavel

0 Aishwarya Rajesh 6 months ago

TI__Expert 3730 points

Hi Roi,

Like Murugavel mentioned, this potentially sounds like a SPI configuration issue, but to double check, have you verified that your hardware setup is correct using an oscilloscope.

In addition, are you seeing the expected waveform? Take a look at the SPI registers specifically SPIRXBUF to see if data is moving between the buffers properly.

Aishwarya

0 Roi Gerstel 6 months ago in reply to Aishwarya Rajesh

Prodigy 40 points

Hi guys,
I was able to finally get it working by using a different sample (ex3_external_loopback) and changing it slightly.

Thanks!
Roi

Motor drivers

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DRV8434S: SPI Example Not Working with F280025C Launchpad