Combining UART and MPU6050

Question

Hello, 
 I was able to build the example project MPU6050 from Github with SDK 16. However, I used Putty to connect to the board (PCA10056) with baudrate of 115200 on COM3 (the COM Port it is connected to) but I didn't get any debug string. The sdk_config.h file I took directly from the example. 
 I used GPIO to turn on a LED when a value from the MPU changed, and the LED changed, verifying that the MPU is not faulty, and I setup the read data from the MPU right, just the UART part is incorrect. 
 May I get some help getting UART running? What to include in sdk_config.h? What function, c source file, header, do I need? 
 Thank you very much.

Guojun Wang · Accepted Answer

Hi, The example you taken was from SDK 14.2. And there were some changes to logging since then. There are two approaches you can take: Update based on your current sdk_config Port your project based on SDK 16 examples Regarding to option 1, basically you need to set the following defines to get the uart logging Set NRF_LOG_ENABLED = 1 in sdk_config.h Copy in the NRF_LOG_BACKEND configuration from an example using UART backend, such as examples/ble_peripheral/ble_app_hrs // NRF_LOG_BACKEND_UART_ENABLED - nrf_log_backend_uart - Log UART backend //========================================================== #ifndef NRF_LOG_BACKEND_UART_ENABLED #define NRF_LOG_BACKEND_UART_ENABLED 1 #endif // NRF_LOG_BACKEND_UART_TX_PIN - UART TX pin #ifndef NRF_LOG_BACKEND_UART_TX_PIN #define NRF_LOG_BACKEND_UART_TX_PIN 6 #endif // NRF_LOG_BACKEND_UART_BAUDRATE - Default Baudrate // <323584=> 1200 baud // <643072=> 2400 baud // <1290240=> 4800 baud // <2576384=> 9600 baud // <3862528=> 14400 baud // <5152768=> 19200 baud // <7716864=> 28800 baud // <10289152=> 38400 baud // <15400960=> 57600 baud // <20615168=> 76800 baud // <30801920=> 115200 baud // <61865984=> 230400 baud // <67108864=> 250000 baud // <121634816=> 460800 baud // <251658240=> 921600 baud // <268435456=> 1000000 baud #ifndef NRF_LOG_BACKEND_UART_BAUDRATE #define NRF_LOG_BACKEND_UART_BAUDRATE 30801920 #endif // NRF_LOG_BACKEND_UART_TEMP_BUFFER_SIZE - Size of buffer for partially processed strings. // Size of the buffer is a trade-off between RAM usage and processing. // if buffer is smaller then strings will often be fragmented. // It is recommended to use size which will fit typical log and only the // longer one will be fragmented. #ifndef NRF_LOG_BACKEND_UART_TEMP_BUFFER_SIZE #define NRF_LOG_BACKEND_UART_TEMP_BUFFER_SIZE 64 #endif // Optionally, change NRF_LOG_DEFERRED to 0 if you don't need deferred logging (when using deferred logging you need to run NRF_LOG_FLUSH() in the main loop to get any log output). Use NRF_LOG_XXX for logging purpose. I am able to get logging work with above changes.

Combining UART and MPU6050

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