CC2540 UART events when using DMA

Pierre Bouchet

Other Parts Discussed in Thread: CC2540

Hello everyone,

I'm using the UART on the CC2540 with the DMA. I pass a callback function to the UART via the config struct, and I would like it to get called when a HAL_UART_TX_EMPTY event occurs. From _hal_uart_dma.c it seems that the only way to trigger this event is to call HalUARTPoll().

Why is this required? Why can't the UART trigger the callback by itself when in DMA mode?

Regards,

Pierre

over 13 years ago

0 Dirty Harry over 13 years ago

TI__Mastermind 19350 points

As a matter of fact, the only way to get the UART callback for any of the possible reasons is by calling HalUARTPoll() and this would be by design, since it is usually not a good idea to be calling high level functions from the ISR level. But you have the source code, so you can add whatever functionality you want.

0 Pierre Bouchet over 13 years ago in reply to Dirty Harry

Prodigy 60 points

Thanks for the explanation.

Instead of triggering the high-level callback directly from the ISR, I followed the polling approach and I wrapped it in a dedicated task. Everything works fine and I don't need to completely disable power saving - I merely suspend it while UART transfers are going on.

Regards,

Pierre

0 Minghua YAO over 12 years ago in reply to Pierre Bouchet

Intellectual 270 points

Hello Pierre,

You succeed DMA or ISR mode?

Could you show me the register configuration list?

Thanks in advance!

Cheers,

Bluetooth®︎

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CC2540 UART events when using DMA