Uart data blocked after PC terminal close COM and open it again

[frank zhang]

Hi All,

I use S120 device to monitor advertising and output the mac address,RSSI information via UART to PC terminal. The PC terminal can receive data continusly from the S120 device if its COM port keeps on, however, if I close the COM port of PC terminal for sometime and open it again, it cannot receive anything from the S120 device again.

From debugging, the application on S120 device is still working when the problem happens, and the PC terminal can receive data again if I excute several steps "Step Over(F10)" to run over the "power_manage()" function in main loop.

The environment is: HW: PCA10000 with QF AAG0 SW: SD s120_nrf51822_1.0.0_softdevice + nrf51_sdk_v6_1_0, using app_uart.c, hw flow control enabled. PC terminal: SecureCRT,38400,8N1,CTS/RTS enabled.

Could anybody help on the problem?

Thanks,

Frank

[Stian Røed Hafskjold]

What I think could happen is when you close the COM connection, the output buffer fills up and the chip fails. You should try to disable HW flow control. In the call to simple_uart_config(), change the last parameter from HWFC to false.

[frank zhang]

you are right, it won't happen if HWFC is disabled, I will close this question anyway.