nrf5340 uart rx buffer size increasing

Question

Hi 
 I am using NRF5340 chip in my custom board to communicate serially with an external device whose data length is more than 128 bytes. 
 The chip can receive 243 bytes of the external device in two bursts. The total number of data bytes is correct but the data has become 
 corrupted due to some sort of data shifting. The interesting thig is that I can receive data correctly only once after programing the chip. 
 Is this because of uart rx buffer size? How can I increase this buffer size in nrf5340. Any data size below 128 bytes can be received 
 correctly. 
 Best Regards 
 .

saeed mahvis · Answer

Hi 
 Actually in nrf5340 there is a parameter UART_BUF_SIZE which is defined by default equal to 256. I couldn't find any explicit 
 definition for rx buffer size for nrf5340. I think this parameter is for both rx and tx buffer sizes each one equal to 128 which in 
 total makes 256. 
 Any how by doubling this number to 512 my problem was solved and the chip could receive more than 200 bytes in one turn 
 and there is no data corruption any more. 
 B.R.