Low level UART and Timer drivers

[firmware_master]

Hi,

I have been looking at the Nordic examples and I found them to be pretty slow with the handlers being the bottleneck as opposed to the actual hardware. I was wondering what is the lowest level drivers that I can use for my applications that involve UART and timers. I also wanted your opinion on the quality of these drivers.

Thanks

[Kenneth]

Moving forward I would suggest using the nrfx drivers, these will be maintained for a long time to come:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/nrfx_migration_user_guide.html?cp=5_1_2_5 

[firmware_master]

I checked the BLE_UART example and it seems like it is using the nrfx drivers but I'm not sure. In the central device, for example, I checked app_uart_put()->nrf_drv_uart_tx() which calls nrfx drivers with functions like nrfx_uarte_tx() and nrfx_uart_tx().  I am receiving all correct BLE data on a central device, but there are bytes being lost when adding the data to the UART.

I checked by doing the following:

I counted the number of times app_fifo_put() was called and the number of times nrf_drv_uart_tx() was called. The sum of these is not equal to the number of bytes received by the BLE application in total.

Let me know what you think of this.

Thanks

[Kenneth]

Hi,

By any chance app_fifo_put() return NRF_ERROR_NO_MEM?
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/lib_fifo.html?cp=5_5_0_3_14 

Tried increasing the UART baudrate?

Best regards,
Kenneth