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AM3358: eHRPWM output issue

andre feng
Expert 1060 points
Part Number: AM3358


Hi ，

SDK : ti-processor-sdk-linux-rt-am335x-evm-03.03.00.04-Linux-x86-Install.bin

Device Tree : am335x-boneblack.dts 

pwm1 normal use, pwm2 no signal output .

Will the device tree is configured correctly ?

How to make gpmc_ad9.ehrpwm2B can output signal normally? 

Modify the device tree as follows:

ehrpwm2a_pins: pinmux_ehrpwm2a_pins {
    pinctrl-single,pins = <
       AM33XX_IOPAD(0x820, PIN_OUTPUT | MUX_MODE4) /* gpmc_ad8.ehrpwm2A */
    >;
};

ehrpwm2b_pins: pinmux_ehrpwm2b_pins {
     pinctrl-single,pins = <
        AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE4) /* gpmc_ad9.ehrpwm2B */
     >;
};

&epwmss1 {
    status = "okay";
};

&ehrpwm1 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&ehrpwm2a_pins>;
};

&epwmss2 {
    status = "okay";
};

&ehrpwm2 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&ehrpwm2b_pins>;
};

BR

  • 0
    TI__Guru 55345 points

    Hello andre,

    Please, use this syntax:

    &epwmss2 {
	status = "okay";

	ehrpwm2: pwm@48304200 {
		status = "okay";
		pinctrl-names = "default";
		pinctrl-0 = <&ehrpwm2b_pins>;
	};
};

    Best regards,
    Kemal

  • 0 in reply to Kemal R. Shakir
    Expert 1060 points
    Hi ,

    Thank you for your reply.

    ehrpwm2b_pins: pinmux_ehrpwm2b_pins {
    pinctrl-single,pins = <
    AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE4) /* gpmc_ad9.ehrpwm2B */
    >;
    };

    &epwmss2 {
    status = "okay";

    ehrpwm2: pwm@48304200 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&ehrpwm2b_pins>;
    };
    };

    Follow the above configuration, but ehrpwm2b_pins still can not use.
    User mode configuration is as follows:

    echo 0 > /sys/class/pwm/pwmchip0/export
    echo 2000000 > /sys/class/pwm/pwmchip0/pwm0/period
    echo 500000 > /sys/class/pwm/pwmchip0/pwm0/duty_cycle
    echo 1 > /sys/class/pwm/pwmchip0/pwm0/enable

    How do I enable the pwm function of the gpmc_ad9.ehrpwm2B pin?


    BR
  • 0 in reply to andre feng
    TI__Guru 55345 points

    These commands will make the pwm2 to output signal:

    echo 1 > /sys/class/pwm/pwmchip2/export
    echo 2000000 > /sys/class/pwm/pwmchip2/pwm1/period
    echo 500000 > /sys/class/pwm/pwmchip2/pwm1/duty_cycle
    echo 1 > /sys/class/pwm/pwmchip2/pwm1/enable

  • 0 in reply to Kemal R. Shakir
    Expert 1060 points
    Hello ,

    Thank you for your reply.

    The ehrpwm2A and ehrpwm2B pins can be used individually.

    For example ：
    &epwmss2 {
    status = "okay";

    ehrpwm2: pwm@48304200 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&ehrpwm2b_pins>;
    };
    };

    I need to use ehrpwm2: pwm@48304200 to control the ehrpwm2A and ehrpwm2B pins.

    How to configure the device tree?

    BR
  • 0 in reply to andre feng
    TI__Guru 55345 points

    Use this:

    &epwmss2 {
    status = "okay";

    ehrpwm2: pwm@48304200 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&ehrpwm2a_pins &ehrpwm2b_pins>;
    };
    };

  • 0 in reply to Kemal R. Shakir
    Expert 1060 points
    Hi Kemal ,

    Thank you for your reply.
    Now I can control the ehrpwm2A and ehrpwm2B pins.

    Best regards,
    Anre