Can I debug BMD300 through SWD interface

[Vishnu Pradeep]

Hi developers,

I am trying to collect data from an AFE (ADS1298) and could get some values. Inorder to check the accuracy I need to plot this value. I am programming this external board using PCA10040 nRF 52DK. I did debug using NRF_LOG_USES_RTT. My question is, Can I send the data from BMD300 through this programming interface using UART? I have seen this NRF_LOG_USES_UART. What is the purpose of this? Will this meet my requirement? If yes, how can I configure this?

Thanks & regards, Vishnu

[bjorn-spockeli]

Hi Vishnu,

I am afraid that you cannot send data from the BDM300 through the SWD interface using UART. The NRF_LOG_USES_RTT and NRF_LOG_USES_UART defines which interface the nrf_log module should use, i.e. either RTT or UART. On a nRF52 DK, you can use both since the both the SWD interface and the UART lines are connected to the Segger OB chip. However, on an external board only the SWD inteface is connected to the Segger OB chip through the Debug OUt connector. You will have to connect the UART pins from your external board to the UART pins of the Segger OB chip in order to send UART data via the nRF52 DK to your computer.

Best regards

Bjørn

[Vishnu Pradeep]

Thanks for this precise explanation. Suppose if I use UART pins what are the things I should define? I am assuming the following. 1. I should call uart_init function with appropriate pin and baud rate configurations. 2. NRF_LOG_USES_UARTshould be set as 1. Do I need to NRF_LOG_USES_RTT to set as 1 also? 3. I should trace 2 wires from the configured TX and RX pins of BMD300 and connect them to SWD pins. Am I correct? Did I miss anything?