Display png to the /dev/fb1

[levelKro]

Hello, I try to fix a problem with "PNGVIEW", If I use the HDMI output, is easy to add a png on the display, but with a LCD on SPI, is not easy.

I try with the "-d" parameter, I have tested many combinaison, nothing work, the code have already worked with another LCD (on HDMI).

My LCD output use the Framebuffer ; /dev/fb1, I have tested to use PNGVIEW with -d and many values, no one working;

Values tested;

• value 1 or 1.0 make an error (DISPLAY != 0)
• 0, 0.0, 0.1, 0.2, :0, 0:0, :0.1, 0:1, 0:0.1 no error msg, but see anything on screen
• 1.1, 1.2, :1, 1:0, :1.1, 1:1, 0:1.1 no error msg, but see anything on screen
• tested also with "2", "3", "4", and "5", no error message, no output on screen
• tested with "/dev/fb0", "/dev/fb1", "fb1", no error, no output on screen

What is the right value for this parameter ? The RaspiDMX report wrongly good or bad the value ?

With FBI, for send to the LCD output, parameter is "-T 2 -d /dev/fb1" (previously just "-T 1" when output is on HDMI port)

Using Raspbian OS lite with Chromium in Kiosk mode on a Raspberry Pi Zero WH with a SPI LCD 3.5" display.