Tool/software: Linux
Hi,
i want to controll a rgb led via the ecap module from the am3358. The led is connected to
ecap0: (A13) mcasp0_aclkx.ehrpwm0A
ecap2: (U14) gpmc_a2.ehrpwm1A
ecap2: (T14) gpmc_a3.ehrpwm1B
Currently i`m not able to boot the system, is the driver init and the channel assignment from pinmux to ecap and from ecap to the pwm driver correct ?
the pinmux
/*pwm pins for RGB led*/
pwm_pins_RG: pinmux_pwmled_pin_r {
pinctrl-single,pins = <
0x48 ( PIN_OUTPUT | MUX_MODE6 ) /* (U14) gpmc_a2.ehrpwm1A */
0x4c ( PIN_OUTPUT | MUX_MODE6 ) /* (T14) gpmc_a3.ehrpwm1B */
>;
};
pwm_pin_B: pinmux_pwmled_pin_b {
pinctrl-single,pins = <
0x190 ( PIN_OUTPUT | MUX_MODE1 ) /* (A13) mcasp0_aclkx.ehrpwm0A */
>;
};
the enable for the ecap module
/*enable pwm for the rgb led*/
&epwmss0 {
status = "okay";
ecap0: ecap@48300100 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&pwm_pin_B>;
};
};
&epwmss1 {
status = "okay";
ecap1: ecap@48302100 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&pwm_pins_RG>;
};
};
led driver description
rgb_led {
compatible = "pwm-leds";
rgb_led_r {
label = "rgb:red";
pwms = <&ecap0 0 50000 PWM_POLARITY_INVERTED>;
max-brightness = <255>;
};
rgb_led_g {
label = "rgb:green";
pwms = <&ecap2 2 50000 PWM_POLARITY_INVERTED>;
max-brightness = <255>;
};
rgb_led_b {
label = "rgb:blue";
pwms = <&ecap2 0 50000 PWM_POLARITY_INVERTED>;
max-brightness = <255>;
};
};
Thanks
Stefan
