NCS losing data on UART reception when BLE scanning and advertising

[db_lw]

Hello everyone,

is it normal behaviour to lose data on UART reception when BLE scanning and advertising both are active?

So far I didn't lose serial data if I just run scanning OR advertising. I tested the UART with 8192 blocks of 10 Bytes of data with a delay between the blocks of ~30ms.

Is there a way to tweak the configuration to not lose data and still run scanning and advertising?

Thanks in advance!

NCS V1.5.1 configuration:

UART Rx:
Buffer size = 125
Timeout = 1ms
Baudrate = 115200 (Updated)

Advertising:
Interval = 211,25 - 318,75

Scanning:
Interval = 60ms
Window = 30ms

[Simonr]

Hi

Please try enabling HW flow control in your project. Automatic HWFC detection is done by driving P0.07 (CTS) from the interface MCU and evaluating the state of P0.05 (RTS) when the first data is sent or received. If the state of P0.05 (RTS) is high, HWFC is assumed not to be used. If HWFC is not detected, both CTS and RTS can be used freely by the nRF application.

Best regards,

Simon

[db_lw]

Hi Simon,

I'm working with a custom board where I don't have CTS/RTS, so I guess HW flow control is not an option.

The used baudrate is 115200, maybe this is too fast for a no flow control setup.

Best regards!