2412599_en-US

[#1]

FRDM-RW612 (Zephyr) — CTIMER0 MAT0/GPIO0 PWM not toggling, MAT1/MAT2 work fine

Board/SDK: FRDM-RW612, NXP-Zephyr v4.3.0

Configured on-board RGB LED (GPIO0=Blue, GPIO1=Red, GPIO12=Green) as pwm-leds on CTIMER0, channels 0/1/2 respectively, using IO_MUX_CT0_MAT0_OUT_IO0, IO_MUX_CT0_MAT1_OUT_IO1, IO_MUX_CT0_MAT2_OUT_IO12 in a shared pinctrl-0 group. Ran a test app cycling duty cycle on all three channels.

Red and Green LEDs PWM correctly (confirmed with Saleae logic analyzer — clean waveforms on GPIO1 and GPIO12). Blue LED (GPIO0/MAT0) stays completely off — logic analyzer shows a flat line, no toggling at any duty cycle (0–100%). Digital GPIO (non-PWM) toggle on GPIO0 works fine,
Only CTIMER0 MAT0 channel fails to output PWM; MAT1/MAT2 on the same timer instance work.

What we need:

• Confirmation whether GPIO0/CT0_MAT0 is a known-working PWM combination on FRDM-RW612 under Zephyr.
• Guidance on any erratum/limitation for CTIMER0 channel 0 on RW612.
• Any working .overlay example that PWMs GPIO0 via CTIMER, for us to diff against.
  
  
  frdm_rw612.overlay
  ```
  

  #include

  / {
  pwm_outputs {
  compatible = "pwm-leds";

  pwm_gpio0: pwm_gpio0 {
  pwms = <&ctimer0_pwm 0 PWM_KHZ(1) PWM_POLARITY_NORMAL>;
  };

  pwm_gpio1: pwm_gpio1 {
  pwms = <&ctimer0_pwm 1 PWM_KHZ(1) PWM_POLARITY_NORMAL>;
  };

  pwm_gpio12: pwm_gpio12 {
  pwms = <&ctimer0_pwm 2 PWM_KHZ(1) PWM_POLARITY_NORMAL>;
  };
  };

  aliases {
  pwm-gpio0 = &pwm_gpio0;
  pwm-gpio1 = &pwm_gpio1;
  pwm-gpio12 = &pwm_gpio12;
  };
  };

  ctimer0_pwm: &ctimer0 {
  compatible = "nxp,ctimer-pwm";

  status = "okay";

  clk-source = <5>;
  clocks = <&clkctl1 MCUX_CTIMER0_CLK>;

  #pwm-cells = <3>;

  mode = <0>;
  prescale = <0>;

  pinctrl-0 = <&pinmux_ctimer0_pwm>;
  pinctrl-names = "default";
  };

  &pinctrl {
  pinmux_ctimer0_pwm: pinmux_ctimer0_pwm {
  group0 {
  pinmux = <
  IO_MUX_CT0_MAT0_OUT_IO0
  IO_MUX_CT0_MAT1_OUT_IO1
  IO_MUX_CT0_MAT2_OUT_IO12
  >;

  slew-rate = "normal";
  };
  };
  };

  ```

Evaluation Board