Is BACKLIGHT on a GP pin?

PicoCalc
1

Peter Mather has posted a GUI demo program that uses the BACKLIGHT command in MMBasic to control the brightness of the screen. Using that command gives the error that BACKLIGHT is not set up. OPTION LCDPANEL should set it up if I can find the pin number for the backlight. Is the LCD in PicoCalc controlled by a GP pin? If so, which one?

2

My understanding (from the schematic) is that it’s controlled by the MCU that does the keyboard and keyboard backlights. So you need to send a command to the MCU via I²C to change the display backlight (and/or the keyboard backlight).

I don’t know how to setup MMBasic to do this though.

-Gordon

1 Like
3

Thanks. I was hoping that since OPTION BACKLIGHT LCD works that there was a standard way to control it. Oh well, so much for that.