Error: L6218E: Undefined symbol nrf_drv_pwm_init (referred from main.o).

[had23j]

Hello,

I am building a project that required pwm drivers and BLE UART. I started by using peripheral ble uart example in SDK 12 and adding the pwm driver source file from the SDK components. I am using Keil uVision 5.

When I use methods from the pwm driver source file I get a linking error:

Error: L6218E: Undefined symbol nrf_drv_pwm_init (referred from main.o).

Is there a specific linking configuration that needs to be done in order for the project to find the pwm driver ?

Thanks.

[bjorn-spockeli]

Make sure that #define PWM_ENABLED in sdk_config.h is set to 1. We have introduced a new SDK header config file in SDK 12, see this Infocenter page.

[Wayne]

Hi,

I've tried setting the define as a -D in the Makefile: CFLAGS += -DPWM_ENABLED=1

and in the sdk_config.h: #define PWM_ENABLED 1

I'm trying to add PWM driver demo2 to the HRS BLE example and am getting this error:

nRF5_SDK_14.2.0_17b948a/examples/ble_peripheral/ble_app_hrs/pca10040/s132/armgcc//../../../main.c:1066: undefined reference to nrf_drv_pwm_init' nRF5_SDK_14.2.0_17b948a/examples/ble_peripheral/ble_app_hrs/pca10040/s132/armgcc//../../../main.c:1108: undefined reference tonrf_drv_pwm_complex_playback'

Is it necessary to go thru a SoftDevice API, hmmm...