Part Number: AM3352
Hello,
I m working with AM335x based board.
In my application, I want to test PWM waveform generation and capture compare input functionality on pin (spi0_cs1.ecap1_in_PWM1_out).
I am able to generate the PWM waveform using below command:
- echo '0' > /sys/class/pwm/pwmchip0/export
- echo 488281 > /sys/class/pwm/pwmchip0/pwm0/period
- echo 244140 > /sys/class/pwm/pwmchip0/pwm0/duty_cycle
- echo 1 > /sys/class/pwm/pwmchip0/pwm0/enable
but I want to capture input signal or PWM waveform generated from other device, when i tried to open the capture file, it shows me below error
root@EVSE:/sys/class/pwm/pwmchip0/pwm0# ls
capture duty_cycle enable period polarity power uevent
root@EVSE:/sys/class/pwm/pwmchip0/pwm0# cat capture
cat: read error: Function not implemented
Can you please guide me about how to test or use capture compare functionality?
My dts file changes are as below:
epwm_out_pins: pinmux_epwm_out_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x960, PIN_OUTPUT | MUX_MODE2) /* (B16) spi0_cs1.ecap1_in_PWM1_out */
>;
};
&epwmss1 {
status = "okay";
ecap1: ecap@48302100 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&epwm_out_pins>;
};
};
