sysfs pwm接口是否使用硬件pwm? [英] Is the sysfs pwm interface using hardware pwm?

问题描述

我按照此答案在我的Beaglebone Black上启用了PWM，但我当时没有不确定该方法是使用PRU进行硬件PWM还是在软件中切换引脚?我看到了对/sys/class/pwm/ehrpwm的其他引用(例如

I followed this answer to enable PWM on my Beaglebone Black, but I wasn't sure if that method is using the PRU to do hardware PWM or if it's toggling the pin in software? I see other references to /sys/class/pwm/ehrpwm (e.g. here) which I'm more confident is hardware PWM, but I'm not sure how to enable that interface.

总结一下我如何启用PWM:

To summarize how I'm enabling PWM:

echo am33xx_pwm > /sys/devices/bone_capemgr.9/slots
echo cape-universal > /sys/devices/bone_capemgr.9/slots
config-pin P8.13 pwm
echo 6 > /sys/class/pwm/export
echo 1 > /sys/class/pwm/pwm6/run
echo 50000 > /sys/class/pwm/pwm6/period_ns
echo 50000 > /sys/class/pwm/pwm6/duty_ns

谢谢！

推荐答案

是的，使用硬件PWM模块-am33xx_pwm覆盖启用所有不同的PWM子系统(eHRPWM，eCAP)，然后PWM内核驱动程序配置所配置引脚的相应PWM模块.

Yup, that's using the hardware PWM modules - the am33xx_pwm overlay enables all the different PWM subsystems (eHRPWM, eCAP), then the PWM kernel driver configures the corresponding PWM module for the pin being configured.

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