-
Notifications
You must be signed in to change notification settings - Fork 70
bbb pwm
mpvader edited this page Nov 1, 2016
·
1 revision
The buzzer is of a type that needs PWM
See schematic of the cape, its connected to this pin:
P9.14 / GPIO1_18/PWMA
Probably some dts change is necessary to setup the mux / pwm.
Once it works, pwm will be accessable via sysfs:
/sys/class/pwm/
https://www.kernel.org/doc/Documentation/pwm.txt
And then we need to implement this in dbus-systemcalc or some other place. Right now dbus-systemcalc expects to write a simple 1 or 0 to a path (/etc/venus/buzzer), as the CCGX had a buzzer with integrated oscillator.
See dbus-systemcalc related code here.