APP_UART_COMMUNICATION_ERROR

[Michel]

I'm trying to hook up a nRF51 to two other devices. One is connected with UART and the other through BLE (NUS).

The connection with BLE is working fine. But as soon as the UART receives data the module resets. I found that this reset is because of the APP_UART_COMMUNICATION_ERROR.

I also noticed that when there are only a few characters there is no problem. But when a device is writing automatically the error appears.

I'm using the UART NUS example.

Does somebody know how I can get rid of the APP_UART_COMMUNICATION_ERROR?

[Susheel Nuguru]

increase your TX/RX fifo buffer so that fifo has more free buffer in hand (this must be some #define in your main.c file). The APP_UART_COMMUNICATION_ERROR says that the error was inside app_uart_fifo.c module and since it was unable to get free buffer from fifo module, the uart driver bailed out.

[Susheel Nuguru]

the maximum size is what ever RAM is available for your fifo module without causing a stack overflow. You can calculate it if you can see your .map file.

example can me

RAMSIZE_ON_YOUR_DEVICE minus 
RAM USED BY SOFTDEVICE minus
RAM used by your application = RAM left unused