Uart RX packet loss for higher baudrate. What is maximum baudrate without packet loss for NRF52/SDK15/Softdevice 6.0.

Question

Dear, 
 I see the Uart Rx packet loss at higher badurate, ie 460800, 921500, 1M. 
 I use NRF52, SDk15 with softdevice 6.0. 
 UART TX is no problem, but there is loss of RX packet. 
 What is the maximum baud rate without packet loss ? 
 
 best regards, 
 Joey kang.

awneil · Accepted Answer

You still don't seem to be getting the distinction between baud rate, and the data throughput that your software can manage. 
 
 I suspect that this is not a baud rate issue, but a limitation on the data throughput that your software can manage. 
 
 The SDK APIs will have a certain overhead. You may be able to do better with carefully-coded direct hardware access. But you then need to be careful not to "hog" the CPU - which could "startve" the BLE stack, and cause that to fail... 
 
 EDIT 
 Maybe DMA might help: https://devzone.nordicsemi.com/f/nordic-q-a/17232/nfr52-uart-with-dma ?

Uart RX packet loss for higher baudrate. What is maximum baudrate without packet loss for NRF52/SDK15/Softdevice 6.0.

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