dm-multiple-face-detection-on-mcxn947 SERVO PIN RUN OUTPUT

jlopezgtcm — Thu, 08 May 2025 17:20:25 GMT

Hello community,

I’m working on a project where I need to control two servos using PWM at 200 Hz through pins P1_22 (tilt) and P1_23 (pan).
I have successfully set SERVO_ENABLE = 1, and the camera module is working correctly and detects without issues. Also, the hardware jumpers on the board are properly configured according to the design.

However, when checking the output on an oscilloscope, no PWM signal is detected on the specified pins, even though the duty cycle values are correctly set.

When reviewing the pin configuration (Routing Details), the following active errors appear: SmartDMA0 - TRIG, 0 on pin B12,SmartDMA0 - TRIG, 1 on pin B11,SmartDMA0 - TRIG, 2 on pin E11,LPFlexcomm0 - LPFLEXCOMM_P0 on pin B10,LPFlexcomm0 - LPFLEXCOMM_P1 on pin A10

These errors suggest conflicts between peripherals, and I suspect they may be preventing proper PWM routing from modules like SCTIMER or CTIMER to pins P1_22 and P1_23.

Has anyone managed to get servo PWM working on these pins? Is there anything specific I should check in the PINMUX or timer clock configuration?

Any help or working examples would be greatly appreciated.

Re: dm-multiple-face-detection-on-mcxn947 SERVO PIN RUN OUTPUT

Harry_Zhang — Fri, 09 May 2025 08:27:04 GMT

Hi @jlopezgtcm

"When reviewing the pin configuration (Routing Details), the following active errors appear: SmartDMA0 - TRIG, 0 on pin B12,SmartDMA0 - TRIG, 1 on pin B11,SmartDMA0 - TRIG, 2 on pin E11,LPFlexcomm0 - LPFLEXCOMM_P0 on pin B10,LPFlexcomm0 - LPFLEXCOMM_P1 on pin A10"

This is because the relevant pins in the demo are handwritten, not generated through the config tool, so there may be an error when opening them.

When i open dm-multiple-face-detection-on-mcxn947 project through config tool. it also reported this error.

I think you can first test the sctimer sample pwm example.

If it can work, i think you can port it to your demo.

Harry

It also uses the pin 1_22 and pin 1_23.

topic dm-multiple-face-detection-on-mcxn947 SERVO PIN RUN OUTPUT in MCX Microcontrollers

dm-multiple-face-detection-on-mcxn947 SERVO PIN RUN OUTPUT

Re: dm-multiple-face-detection-on-mcxn947 SERVO PIN RUN OUTPUT