Beaglebone Black: How to switch on/off backlight of LCD7 with BBB ???

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1

Hi,

On my Beaglebone white I could do a

    echo [n] >! /sys/devices/platform/pwm-backlight/backlight/pwm-backlight/brightness

to switch / dimm the backlight of the LCD7 cape ([n]=:0-255).

The path is missing on the Beaglebone Black.

how can I dim/toggle the backlight of the LCD7 cape when it is
attached to the Beaglebone Black?

Best regards,
mcc

2

Have a look in /sys/class/backlight/

3

Koen Kooi <koen@beagleboard.org> [13-08-02 17:16]:

> Hi,
>
> On my Beaglebone white I could do a
>
> echo [n] >! /sys/devices/platform/pwm-backlight/backlight/pwm-backlight/brightness
>
> to switch / dimm the backlight of the LCD7 cape ([n]=:0-255).
>
> The path is missing on the Beaglebone Black.
>
> how can I dim/toggle the backlight of the LCD7 cape when it is
> attached to the Beaglebone Black?

Have a look in /sys/class/backlight/

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Hi Koen,

LIFESAVER!!! Thanks a lot!

Another question in this context:

The Beaglebone White has an additional header (P6) with some contacts
of the PMIC.

The Beaglebone Black does not have such.

The LCD7 has a connector to the PMIC header.

What """deficits""" (sorry, didn't any other wording...) do I have
to exspect (not only concering the LCD7), when using the BBB in place
of the BBW regarding this header.

(hopefully my """english""" does not make a single big knot out
of all these words....:wink: ???

Thanks a lot in advance!
Best regards,
mcc