Get UART error

[Himansu Donga]

Hi,

I am using device as ble-Peripheral SDK nRF51_SDK_7.2.0_cf547b5 and softdevice version :s110_nrf51822_7.1.0_softdevice.

problem : I am receiving data on Nordic uart some time i got uart error and error source register contain below value. I using simple uart with interrupt enable.

NRF_UART0->ERRORSRC = 1;

How resolve this problem?

Regards, Himansu Donga

[Matt Barr]

Hi Himansu, if ERRORSRC contains 1 then it appears you are getting an overrun error. This means a start bit was received while the 6-deep hardware RX FIFO is full, data is dropped and overrun is flagged.

You'll have to figure out why this is happening, it may be due to processor unavailability during radio events or there could be some other reason. Nordic has typically recommended hardware flow control (RTS/CTS) as a solution to RX data loss associated with processor unavailability.

According to the release notes, processor availability during radio events is improved in the S110 v8.0.0 softdevice with rev 3 devices.

[Hung Bui]

Rev2 Hardware has 6 bytes buffer, but it doesn't support the new S110 that don't have CPU non-blocking option, so the maximum CPU blocking period is 6ms. Please see section 11.3.2 in the S110 Softdevice Spec v1.3 (the spec v2.0 is for S110 v8.0)