Raspberry Pi 4 Won't Work with Some USB Type-C Cables
10 July, 2019, 22:17
The unfortunate result is that the Raspberry Pi 4 won't work with just any USB-C cable.
E-marking is a technique which gives a cable a digital signature based on what the cable is going to do.
"A smart charger with an e-marked cable will incorrectly identify the Raspberry Pi 4 as an audio adapter accessory and refuse to provide power", says Upton.
The bad news is that there's not a lot the team can do about this until the next hardware revision - the quirk is built into the hardware. The Raspberry Pi Foundation will probably fix this design error in future board revisions, so you might get a more compatible device if you wait for that.
"It's surprising this didn't show up in our (quite extensive) field testing program", Upton said.
Ward recommends that Raspberry Pi 4 owners use non e-marked cables for now, such as those used by many smartphone chargers. It features a powerful 1.5 GHz quad-core 64-bit ARM Cortex-A72 CPU, up to 4GB of RAM, support for up to 4K resolutions, Bluetooth 5.0, Gigabit Ethernet, 2x USB 2 and 2x USB 3 ports, 2x micro-HDMI ports, and a USB-C power supply.
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Instead of trying to come up with some clever circuit", Leung writes, "hardware designers should simply copy the figure from the USB-C Specexactly [emphasis his] The Figure 4-9 I posted above isn't simply a rough guideline of one way of making a USB-C receptacle.
The Raspberry Pi Foundation a couple of weeks back announced its latest single-board computer.
Perhaps the most notable change was the move to USB Type-C for power. It's actually normative, meaning mandatory, required by the spec in order to call your system a compliant USB-C power sink.
As an illustration, you should utilize a MacBook Pro charger with loads of USB-C devices. "The Raspberry Pi 4 is actually a pretty incredible little machine", said Offensive Security. E-marked cables are fully featured USB-C cables with chips inside that negotiate power management, accessory modes, data rates, and other communication specs. However, several modern-day chargers are able to deliver far more power owing to newer Fast Charging standards.
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