Log did not output after I changed NRF_LOG_BACKEND_UART_TX_PIN

[john.liu]

I use nRF5_SDK_for_Thread_and_Zigbee_2.0.0_29775ac and pca10056 board.

I use project nRF5_SDK_for_Thread_and_Zigbee_2.0.0_29775ac\examples\zigbee\light_control\light_bulb\pca10056\blank.

uart config:

define NRF_LOG_BACKEND_UART_TX_PIN  6

define Baudrate                                                 115200

define NRF_LOG_DEFERRED                         0

Terminal tool                                                      Termite

This configuration log has output.

But I change this.

uart config:

define NRF_LOG_BACKEND_UART_TX_PIN  10

define Baudrate                                                 115200

define NRF_LOG_DEFERRED                         0

Terminal tool                                                      Termite

This configuration log has no output.

The above two configurations are running on pca10056 board.

[Susheel Nuguru]

The segger chip on the PCA10056 board only listens to pin 10 as TX. If you are listening to USB emulated com port then you cannot get anything out as the data is going to wrong pin.

[Varun]

One more thing to make a note here, The pin 10 is actually an low frequency I/O pin, as mentioned in the datasheet of NRF52840



so you can use only if its lower than that frequency
hope this helps