How to define and use UART & TWIS without DMA transmission on nrf52810?

RE: How to define and use UART & TWIS without DMA transmission on nrf52810?

Jakub Rzeszutko — Mon, 09 Jul 2018 11:07:12 GMT

Hi,

Some example how TWIS peripheral can be used you can find here:

sdk\nrf5\examples\peripheral\twi_master_with_twis_slave

Basically peripherals with EasyDMA are using memory buffer for Tx and Rx data. If you will set size of these buffers to 1 byte you will be more less using UARTE/TWIS like UART/TWI peripherals.

There are some other event flags you need to look for, but this can be found in the documentation.

RE: How to define and use UART & TWIS without DMA transmission on nrf52810?

studzinski — Mon, 09 Jul 2018 09:39:46 GMT

Thanks for the confirmation.

The post of Jakub saddened me very much, because we have developed our product for nrf51822 without DMA feature and changed the chip thinking that it is 100% software compatible...

Have you any example of use of UARTE? The example I have is obviously for UART, not for UARTE.

Will it work "as is"? If no, what modification is necessary to make working using app_uart_fifo.c library?

Is this library "transparent"?

Idem for TWIS...

Cordially

RE: How to define and use UART & TWIS without DMA transmission on nrf52810?

ovrebekk — Mon, 09 Jul 2018 08:58:18 GMT

And to add to Jakub's reply, the nRF52810 does not have the older UART, TWI and SPI interfaces.

They were kept around in the nRF52832 for compatibility reasons, but have now been deprecated in new designs. There is no benefit to using the non-DMA versions over the DMA versions, other than being able to use old code without modifications.

RE: How to define and use UART & TWIS without DMA transmission on nrf52810?

Jakub Rzeszutko — Mon, 09 Jul 2018 06:11:55 GMT

Hi,

For peripherals like UARTE, TWIM, TWIS, SPIM, SPIS EasyDMA is the only possible transfer option.