Bit dazzed on how to stop SPI module in the middle of transaction

RE: Bit dazzed on how to stop SPI module in the middle of transaction

Einar Thorsrud — Thu, 06 Feb 2020 14:12:00 GMT

Hi,

[quote user=""]Query: Is it possible to stop the SPI transaction in the middle(especially for this long messages)? so that a new interrupt can be processed. If it possible, how it can be done? [/quote]

Yes, it is possible to abort a transfer. If you use the driver, you can use nrf_drv_spi_abort(). Please note that you should not have any problems handling interrupts in between anyway if you use the SPIM peripheral, since that use DMA for transferring data and only needs the CPU for setting up transfers. So the CPU will be free to do other work while the transaction is ongoing.

RE: Bit dazzed on how to stop SPI module in the middle of transaction

AimHigh — Thu, 06 Feb 2020 11:59:18 GMT

Hi Tubro,

I can share the source code in private. Can you set this under private mode?

RE: Bit dazzed on how to stop SPI module in the middle of transaction

Turbo J — Thu, 06 Feb 2020 09:36:14 GMT

[quote userid="78183" url="~/f/nordic-q-a/57474/bit-dazzed-on-how-to-stop-spi-module-in-the-middle-of-transaction"]that a new interrupt can be processed[/quote]

Interrupts on NRF5x (aka ARM Cortex-M) are preemptible.

So once you set your priorites correctly, the SPI interrupt can be preempted by the app_timer interrupt handler at any time.

We would need to look at your source code why there is no "long" message displayed.