Search found 55 matches

by floppes
Fri Jan 21, 2022 9:00 am
Forum: Hardware Help
Topic: 5 Volt to 12 Volt Step Up Converter
Replies: 1
Views: 3494

Re: 5 Volt to 12 Volt Step Up Converter

The Arduino Uno runs totally fine with 5 V supplied through USB. If you have a regulated and stable 5 V supply, you can even connect it directly to the 5 V power pin. For the barrel jack you need 7-12 V. It's purpose is for a setup where you don't have a 5 V power supply. Reference: http://cactus.io...
by floppes
Fri Jan 07, 2022 10:40 am
Forum: Support (Game Boy Zero)
Topic: JT035IPS02 640x480 display config
Replies: 18
Views: 13759

Re: JT035IPS02 640x480 display config

The first screen looks identical to mine, but I guess it has a different firmware. That's one of the imponderables we get with AliExpress :lol:
by floppes
Thu Jan 06, 2022 7:42 am
Forum: Support (Game Boy Zero)
Topic: JT035IPS02 640x480 display config
Replies: 18
Views: 13759

Re: JT035IPS02 640x480 display config

Ok, then we got different displays. I ordered here and got two identical displays: back.jpg front.jpg How do your displays look like? I wrote a small image manipulator to simulate RGB666. It turns out that when the colors are shifted left by two bits (D0 becomes D2, D1 -> D3 etc. and D6 + D7 are cut...
by floppes
Sun Jan 02, 2022 1:22 pm
Forum: Support (Game Boy Zero)
Topic: JT035IPS02 640x480 display config
Replies: 18
Views: 13759

Re: JT035IPS02 640x480 display config

No offense to Kite, but I think he is wrong. If he is reading this, maybe he can join the discussion :) The display isn't clever and it is configured for RGB888 according to the datasheet. I am also using RGB666 and connected the least significant bits R0, R1, G0, G1, B0 and B1 to GND. And it is wor...
by floppes
Sat Oct 30, 2021 9:27 am
Forum: Support (Game Boy Zero)
Topic: JT035IPS02 640x480 display config
Replies: 18
Views: 13759

Re: JT035IPS02 640x480 display config

I ordered two displays and received them today. They work fine 8-) 1.jpg 2.jpg 3.jpg I am using DPI_OUTPUT_FORMAT_18BIT_666_CFG2 together with dpi18_6.dtbo, therefore my config.txt looks like this: dtoverlay=dpi18_6 enable_dpi_lcd=1 display_default_lcd=1 dpi_group=2 dpi_mode=87 dpi_output_format=516...
by floppes
Mon Oct 18, 2021 9:32 am
Forum: Support (Game Boy Zero)
Topic: JT035IPS02 640x480 display config
Replies: 18
Views: 13759

Re: JT035IPS02 640x480 display config

This helps a little for the signal polarities. But the Raspberry Pi documentation doesn't really explain what it means with "polarity inverted"... is it high or low? We would need to confirm the timings with an oscilloscope. I have one here ;) The microcontroller controls the SPI pins of the display...
by floppes
Sun Oct 17, 2021 2:24 pm
Forum: Support (Game Boy Zero)
Topic: JT035IPS02 640x480 display config
Replies: 18
Views: 13759

Re: JT035IPS02 640x480 display config

I think you are on the right way. But the test images are not displayed correctly: 1_.png should be 1.png And 2_.png should be 2.png There are still some problems with color gradients which you also see in EmulationStation. But so far I have no idea what is wrong. It must be the configuration, not t...
by floppes
Sun Oct 17, 2021 2:26 am
Forum: Support (Game Boy Zero)
Topic: JT035IPS02 640x480 display config
Replies: 18
Views: 13759

Re: JT035IPS02 640x480 display config

Ok, the Circuit Sword generates the correct voltage for the backlight. Your display is pin-compatible to the 320x280 pixel display that Kite supplies. Kite also offered a 640x480 "HD" display for the Circuit Sword. Is this the JT035IPS02-V0 you are using? Anyway, you can use Kite's config.txt as a r...
by floppes
Sat Oct 16, 2021 7:02 am
Forum: Support (Game Boy Zero)
Topic: JT035IPS02 640x480 display config
Replies: 18
Views: 13759

Re: JT035IPS02 640x480 display config

The color channels seem to be swapped. You can play with the rgb_order setting in the DPI generator. Currently you have dpi_output_format=22364160, which means rgb_order is 0. That's not a valid value. How do you connect the display to the Raspberry Pi? And how do you generate the 18 V for the backl...
by floppes
Fri Oct 15, 2021 2:48 pm
Forum: Support (Game Boy Zero)
Topic: JT035IPS02 640x480 display config
Replies: 18
Views: 13759

Re: JT035IPS02 640x480 display config

If I'm correct, dpi_mode=7 is 640x480 with 85 Hz ( source ). Try dpi_mode=4 for 60 Hz or even better dpi_mode=87 for custom timings through dpi_timings. I would also remove framebuffer_width and framebuffer_height as they are usually not needed. The DPI config generator does not take into account th...