TMS320F28388D: cm uart udma for tx data on gpio 84

Yair b

Prodigy 100 points

Part Number: TMS320F28388D

Tool/software:

Hello,

I took the example of the loopback with udma and uart, I remove the enableloopback line on the code.

I also run on c1 the uart_config_c28 instead of the cm_common_config so gpio 84 will be tx.

Should this changes are enough to see something being tx from gpio 84?

Because I don't see anything on terminal and not on gpio84 with scope..

Tnx

3 days ago

0 Delaney Woodward 1 day ago

TI__Mastermind 19395 points

Hi Yair,

You will need to follow the correct order of steps: load & run uart_config_c28x on CPU1 and load & run your modified uart_ex2_loopback code onto the CM core. See documentation about this here: 6. Debugging multiple cores — C2000 Multicore Development Guide.

Also note that the example code only transmits data once (not repeatedly) so to see it on a scope you will want to trigger on the falling edge.

Best Regards,

Delaney

0 Yair b 1 day ago in reply to Delaney Woodward

Prodigy 100 points

Ok thanks I debuged the program and changed it to do a udma rx of 50 bytes and I do polling on this 50 bytes rx. After the 50 bytes arrives I do a dma tx of the same 50 bytes. I use the same buffer for tge rx and tx. In order to do the tx I also use polling.

Is there a way to do this using interrupts instead of polling?

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TMS320F28388D: cm uart udma for tx data on gpio 84