TMS320F280025C: F280025C as SPI slave with ESP32 (master)

Rashmi Kumar

Part Number: TMS320F280025C

Hello !

I am trying to communicate between F280025C(slave) and ESP32(master) with SPI communication.

I can send the data from ESP32 (SPI master) and also can see the signals on oscilloscope (CLK, CS and MOSI). Unfortunately the F280025C is not able to put its data out on MISO line and therefore I receive zero all the time.

I have set F280025C in slave mode and without interrupts. Also I have enabled pull up and set the ASYC modes on GPIO pins. I am not sure the slave is able to recognize the master clock signals.

Is there any special way to set the F280025C in slave mode other than those mentioned in examples? How can I configure the slave device to recognize the master clocks and put its data out. Any leads would be helpful.

Thank you!

over 3 years ago

0 Manoj Santha Mohan over 3 years ago

TI__Guru 55700 points

How does F280025 SPI slave know that it needs to transmit when you are not using SPI interrupt? Is SPI slave receiving data from master?

0 Rashmi Kumar over 3 years ago in reply to Manoj Santha Mohan

Prodigy 20 points

Hi Manoj,

I also tried with the interrupts (without FIFO), still the slave is not responding.

And yes the slave is receiving the data from master. I can see the data on MOSI line of F280025C on the scope.

The thing is the configuration and logic is working well when I use the SPI master and slave on F280025C , meaning SPIA as slave and SPIB master. But the same configuration is not working with ESP32 as master and F280025C as slave.

0 Manoj Santha Mohan over 3 years ago in reply to Rashmi Kumar

TI__Guru 55700 points

Rashmi,

What happens when you write to SPI slave SPITXBUF? Did you try different SPISOMI pin?

Regards,

Manoj

0 Manoj Santha Mohan over 3 years ago in reply to Manoj Santha Mohan

TI__Guru 55700 points

Is SPI slave interrupt getting triggered? When is data written to SPITXBUF? Is it when SPI gets interrupt (or) before?

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TMS320F280025C: F280025C as SPI slave with ESP32 (master)