please clarify UART / UART0 in SDK

RE: please clarify UART / UART0 in SDK

danmcb — Thu, 20 Jan 2022 09:49:01 GMT

ok! I will take that advice! thank you! all the best.

RE: please clarify UART / UART0 in SDK

Simonr — Thu, 20 Jan 2022 09:47:47 GMT

I understand the confusion, but no these defines aren't exactly the same. As the driver ENABLE define won't specify what instance to use in the UART drivers/libraries of the SDK. Both NRFX_UART_ENABLED and NRFX_UART0_ENABLED should be set to 1.

Our example projects in the nRF5 SDK use the UART_ENABLED and UART0_ENABLED defines by default, as they use the nrf_drv_uart driver to enable the UART and UART instance by default.

Best regards,

Simon

RE: please clarify UART / UART0 in SDK

danmcb — Wed, 19 Jan 2022 12:17:05 GMT

thank you Simon. What do you mean by "NRFX_UART_ENABLED define only enables the UART peripheral driver, while NRFX_UART0_ENABLED must be set to 1 to enable the instance as well"?

what do you mean by the "driver"and the "instance" - are they not basically the same thing? (Ok typically you create an instance in your code and instantiate it in the driver?)

but the botttom line is both should be enabled? (we have code running that has only one, it does seem to work, although we have some issues we are working on ...)

RE: please clarify UART / UART0 in SDK

Simonr — Tue, 18 Jan 2022 13:18:52 GMT

Indeed, the nRF52832 only has one UART/UARTE instance available, so you will have to choose one or the other. The reason there is both NRFX_UART_ENABLED and NRFX_UART0_ENABLED is that we have SoCs that have more instances, and the NRFX_UART_ENABLED define only enables the UART peripheral driver, while NRFX_UART0_ENABLED must be set to 1 to enable the instance as well, as the UART_ENABLED define does not set this.

Best regards,

Simon