RE: Increase UART speed using UARTE directly

Hieu — Fri, 23 Sep 2022 13:38:49 GMT

Hi,

[quote user=""]– do I need to use nrf_drv_uart_tx() in app_uart_fifo.c ?\[/quote]

I think you perhaps mean app_uart_put(), and if so, yes.
I am not sure if you can actually use nrf_drv_uart_tx(). If you are using app_uart.c, it should be wrapped up in the module and not accessible to you.

[quote user=""]– do I need to make changes on MCU side?[/quote]

[quote user=""]– Or Do you have an example code using nrf_drv_uart_tx() for faster UART transmission?[/quote]

"Yes." It is not nrf_drv_uart_tx(), but there are two examples with UART usage, I will refer to them below.

As you mentioned app_uart.c and app_uart_fifo.c, I believe you are using the UART Module library.
If so, I am afraid you are not using UARTE, but just a regular UART peripheral.
Among the two implementation of this module, app_uart_fifo.c added FIFOs for transmit and receive, and should give you better performance.

The example for this library locates at: <SDK Root>/examples/peripheral/uart
The documentation of the example is at: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/uart_example.html

If you wish to utilize the UARTE, please take a look at this Advanced UARTE Driver library: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/lib_libuarte.html

The example for this library locates at: <SDK Root>/examples/peripheral/libuarte
The documentation of the example is at: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/libuarte_example.html

I have just tested both examples, changed the baud rate to 1 000 000 B/s, and they both worked as expected.

Best regards,

Hieu