The problem of using UART to communicate between nRF160 and nRF2833 on nRF Connect SDK.

[Kenny]

Hello, All,

When using UART on nRF Connect SDK to communicate between nrf9160DK and nRF2833DK, I found that the data length of a packet sent by the UART on both sides is different.

When using nRF9160 to send, a data packet can reach more than 1K; but when using nRF2833 to send, it is found that a data packet can only send about 250 bytes.

WHY?

Are there any restrictions?

Is it restricted by DMA?

Where is the explanation about this part?

The sending function I use is: "uart_tx()".

Even if I change the value of the macro CONFIG_UART_0_NRF_TX_BUFFER_SIZE, it has no effect.

[Kenny]

Sorry, I didn't see your reply until recently due to some other reasons, I'll try it when I have time.

Thanks very much!

[ovrebekk]

Hi 

No problem, just let me know if you have any more questions or comments after you have time to take a look. 

Also, I made my own little UART example here to show a different way of handling the TX and RX buffering. 

Best regards
Torbjørn