Exploring The Raspberry Pi 4 USB-C Issue In-Depth

It would be fair to say that the Raspberry Pi team hasn’t been without its share of hardware issues, with the Raspberry Pi 2 being camera shy, the Raspberry Pi PoE HAT suffering from a rather embarrassing USB power issue, and now the all-new Raspberry Pi 4 is the first to have USB-C power delivery, but it doesn’t do USB-C very well unless you go for a ‘dumb’ cable.

Join me below for a brief recap of those previous issues, and an in-depth summary of USB-C, the differences between regular and electronically marked (e-marked) cables, and why detection logic might be making your brand-new Raspberry Pi 4 look like an analogue set of headphones to the power delivery hardware.

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Raspberry Pi Cyberdeck Inspired By Rare MSX

When we see these cyberdeck builds, the goal is usually to just make something retro-futuristic enough to do William Gibson proud. There’s really no set formula, but offset screens coupled with large keyboards and a vague adherence to 1980s design language seem to be the most important tenets.

Granted the recent build by [lewisb42] still leans heavily on those common tropes, but at least there’s a clear lineage: his Raspberry Pi retro all-in-one is styled after a particularly rare bright red variant of the MSX that Sony released in Japan. Known as the HIT-BIT HB-101, some aficionados consider the circa-1984 machine to be the peak of MSX styling. Since getting his hands on a real one to retrofit wasn’t really an option, he had no choice but to attempt recreating some of the computer’s unique design elements from scratch.

The faceted sides were 3D printed in pieces, glued together, and then attached to a 1/4″ thick backplate made out of polycarbonate. For the “nose” piece under the keyboard, [lewisb42] actually used a piece of wood cut at the appropriate angles with a table saw. The top surface of the computer, which he calls the FLIPT-BIT, is actually made of individual pieces of foamed PVC sheet.

If all this sounds like a big jigsaw puzzle, that’s because it basically is. To smooth out the incongruous surfaces, he used a combination of wood putty, body filler, spot putty, and more time sanding then we’d care to think about. For the 3D printed surface details such as the screen bezel and faux cartridge slots, he used a coat of Smooth-On’s XTC-3D and yet more sanding. While [lewisb42] says the overall finish isn’t quite as good as he hoped, we think the overall look is fantastic considering the combination of construction techniques hiding under that glossy red paint job.

As for the electronics, there’s really no surprises there. The FLIPT-BIT uses a keyboard and touchpad from Perixx, a seven inch TFT display, and of course the Raspberry Pi 3. The display runs at 12 V so [lewisb42] used a combination of a generic laptop-style power supply and a 5 V step-down converter to keep everyone happy. While it doesn’t currently have a battery, it seems like there’s more than enough room inside the case to add one if he ever wants to go mobile.

If this build doesn’t properly scratch your Neuromancer itch, never fear. Just take a look at this decidedly less friendly-looking build that even includes a VR headset for properly jacking yourself into the matrix.

Building A Development Board For The STM32 G0 Series

When [Andy Brown] recently tripped over ST’s new G0 series of MCUs, he figured after some research that the best way to learn everything there’s to know about the STM32G0xx by making his own development board based around the STM32G081. The result is a Nucleo-style board, breaking out all pins to convenient 2.54 mm headers, and with a number of niceties, such as an on-board coin cell and 32.768 kHz LSE oscillator for RTC use and three different power supplies (3.3 V, 2.5 V, and 1.8 V) for the MCU.

The board is programmed with an external ST-Link programmer that connects to the SWD interface on the MCU, with a 20-pin programming header provided. While by no means small or compact, it makes for very easy breadboarding and prototyping, with all 2.54 mm headers accessible from the bottom and top.

As for the STM32G0 series itself, the jury is still out on its performance compared to the F0. The former swaps the Cortex-M0 core for an M0+, with a reduced pipeline length (3 stages in the G0) but increased frequency (64 MHz versus 48 MHz). The G0 has a little bit more SRAM, but so far less Flash storage. According to ARM, this MCU range is designed to remove any need to still use an 8-bit MCU. Big claims, indeed.

The biggest issue which [Andy] had while developing this board was probably with the CH340 USB-UART chip. Ordering them from AliExpress as is common, the CH340G ICs he got just wouldn’t work on the first board revision, forcing him to switch to the CH340E and requiring a board respin. This version has an internal oscillator and as a bonus even came in the original tape packaging when it arrived, instead of in a plastic baggy like with the CH340G parts.

See a video of [Andy] going through the design after the break.

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