UARTE configuration with nrf9160 and zephyr

[Rajender]

Hi,

we have developed our working UART code according to Zephyr documentation, and its working fine,

we find that this code works with EasyDMA . but my question is my uart2_fifo_callback function is calling for every byte, why its happening like this, please help me to understand?

Note: we are using UART in UARTE_INTERRUPT_DRIVEN mode

and some other doubts are:

1. How we can increase/decide RX FIFO size

2. How we can configure UART so that the Uart_fifo_callback function will be called only once per every communication

3. What is the difference between UARTE_INTERRUPT_DRIVEN and CONFIG_UART_ASYNC_API, can we have interrupt handler even if i use CONFIG_ASYNC_API mode?

Best Regards

Rajener.

[ovrebekk]

Hi Rajener

I think it would be better to use the ASYNC version in this case. Then you can define a timeout, and rather than get a callback for each byte you will get a callback either if the RX buffer is full, or if the timeout is reached and there is no new data. 

I made a simple example to show how to use the UART ASYNC driver a while back:
https://github.com/too1/ncs-uart-async-count-rx/blob/master/src/main.c

Best regards
Torbjørn

[Rajender]

Hi,

Finally i have tested your project and its working fine, triggering interrupts according to the data buffer size and timeout delay,

but it working only one direction, means if i send any data to uart port through my terminal software its receiving and i can see the data also, but when i add uart tx function then also its not sending data to uart port from my microcontroller, i have tried both uart_tx() or z_impl_uart_tx() but no use
NOTE: i did not enabled console also, Im using uart_2 for my uart communication

Please help me to understand

Best Regards

Rajender