undefined symbol error

[karthikeyan]

hi, i want to add uart function to my application. so i added necessary .c files to my project. if i compile the program i am getting these errors.

when i change the values sdk.config.h file

#ifndef APP_UART_ENABLED
#define APP_UART_ENABLED 1
#endif
#ifndef APP_FIFO_ENABLED
#define APP_FIFO_ENABLED 1
#endif

i am getting the error cant open app_fifo.h file.

do i want to make any other changes.

[Jørgen Holmefjord]

Hi,

You need to also include app_fifo.c, set#defined APP_FIFO_ENABLED 1 in sdk_config.h, and add the path to app_fifo.h. app_uart is dependet on this library. You also need to do the same for UART driver, if not included already.

If you are planning to use printf() for output to UART, you also need to include the source file retarget.c, and #define RETARGET_ENABLED 1 in sdk_config.h.

Best regards,

Jørgen

[karthikeyan]

hi jorgen, i made necessary changes as you told. now i am getting these errors

._build\nrf52840_xxaa.axf: Error: L6218E: Undefined symbol ble_nus_on_ble_evt (referred from main.o). ._build\nrf52840_xxaa.axf: Error: L6218E: Undefined symbol ble_nus_string_send (referred from main.o).

[karthikeyan]

i have included ble_nus.c also

[Jørgen Holmefjord]

Did you enable ble_nus in sdk_config.h?

#ifndef BLE_NUS_ENABLED
#define BLE_NUS_ENABLED 1
#endif

[karthikeyan]

now my program is compiled successfully. but when i flash it to my dk. it is telling no jlink found. in options for target in debug. it is telling cannot read j-link version number. when i flash another project it is working fine. what is the problem in this