piTouch

[sh1ntomi]

Hyperpixel with Pi zero 2w - glowing screen

Hi

I am trying to get Jivelite working on Pi Zero 2w and a Hyperpixel rectangular touchscreen. I have followed the steps at https://github.com/piCorePlayer/hyperpixel4.

All I get is a glowing screen with no startup screen or jivelite display. Anyone got this working on this combination - PcP/PiZero2W/Hyperpixel Touch(rect) ?

Note : I am connected through ssh and no hdmi.

[chicks]

Source and binary (for Pi Zero 2W running RPiOS Buster): https://github.com/retired-guy/Spectrum

[chicks]

More playing with bellini to split the meters in two, like a Revox A700. I rather like it.

I'll post the mod to github when it's fully tested.

[chicks]

Swapped the Pi Zero W for the new Pi Zero 2 W, no changes to the setup. Went from 9-10 fps to a solid 27 fps! CPU had been maxed out running just my hack of Bellini and squeezelite, with a USB->Optical adapter into the RME DAC. Now it's sitting at 27%. Sweet. Well worth the extra $5.

[chicks]

Very basic Python script for the touchscreen LMS client published on Github: https://github.com/retired-guy/Squeezebox

No menus, just a simple touch controller with start/stop, next and prev controls, for fat fingers, tied to a single LMS client. Includes display of date/time, local temperature, and AQI (color of bars) on screen while playing a track.

[chicks]

When I first got my hyperpixel rectangular touch, finding a case/design was non existent. I just printed this one for use with my pi3b. https://www.thingiverse.com/thing:4284094 It works really nice.

Similar design for a pi4. https://www.thingiverse.com/thing:4544931

Those look great! If I had a 3D printer…. Meanwhile these little Pi Zero cases are a bit pricey to have made, but IMO they look great on the RME DAC, and the Zeros get the job done. Squeezelite takes surprisingly few resources.

[chicks]

Turns out the bellini code was calling the log() function twice in a very long loop for values that didn't change inside the loop. Oops! A performance killer. Moved the two calls outside the loop, and the Pi Zero is MUCH happier, able to keep up the dance with the ADI DAC and the much more powerful Pi 3A+. Still only 10fps, but appears to be sufficient.

Also fixed a 44.1kHz segfault bug in bellini.

[chicks]

Yeah, those dancing bars were bogging down the Pi Zero, was getting about 8 fps. Pi 3A loafs along, much higher frame rate. I'm sure the Zero could handle the load if only screen changes were written each frame, instead of updating the entire screen, but doing that is WAY over my head at this point.

[paul-]

When I first got my hyperpixel rectangular touch, finding a case/design was non existent. I just printed this one for use with my pi3b. https://www.thingiverse.com/thing:4284094 It works really nice.

Similar design for a pi4. https://www.thingiverse.com/thing:4544931

[chicks]

Dusting 30 years' worth of cobwebs off my ancient C language coding skills, to muck around with bellini. Fewer bars and much faster decay make for a promising start.

[chicks]

Bellini's FFT mode works fine with a 96K stream, despite crashing at 44.1K. Odd. It's a mesmerising display, but the decay time is very slow, so the screen gets quite cluttered. Think I'll stick with the RME's FFT, which is instantaneous in both attack and decay, and has useful x/y labels.

Bellini's PPM mode is much more useful, IMO. Its ability to display both channels on a single graph is nice.

[paul-]

It runs fine. I’m using a pi3b+. The only problem with jivelite is the frame rate is high, and it causes scrolling text to fly by.

[Paul Webster]

I should be picking up a Hyperpixel 4-inch display with touch support later today and I'll try to run Jivelite on it.

[chicks]

Playing with bellini, which was written specifically for the Hyperpixel 4" display. It uses squeezelite's -v option to grab data from squeezelite in real time via shared memory, then display it to a nice, accurate DIN Peak Program Meter. It can also display FFT, similar to the display on my RME DAC, but segfaults on a Pi Zero. I'll have to try it with a Pi 4, perhaps needs more CPU.

So now, naturally, I'll need another Hyperpixel 4 and case for my LMS client touch display, lol.

[chicks]

Looks great! Don't remember which plastic I ordered, but the finish is a very good match for the crinkle black paint on my DAC. Two of these would exactly fit the width of the DAC - maybe I'll order another just to display the cool piCorePlayer VU meters on one, lol.