USBD on a custom 52840 board

RE: USBD on a custom 52840 board

nasinn — Tue, 23 Apr 2019 11:02:47 GMT

After excluding something wrong in terms of firmware, many thanks. I took a look into the schematics, which I confirmed are the same as the USB interface design on the DK. I then took a look at the components on the board, and it turns out I soldered the diode 90 degrees off... So now it works like a charm.

RE: USBD on a custom 52840 board

Turbo J — Tue, 23 Apr 2019 10:18:02 GMT

Note that windows can only recognize an usb device if either D+ or D- is pulled high via resistor or port pin. You might want to check for soldering/wirering errors.

RE: USBD on a custom 52840 board

nasinn — Tue, 23 Apr 2019 09:02:37 GMT

This I do realize. I've flashed the cdc acm examples and I still the error when I plug it in. When you flash the DK with blinky and plug it in, Windows doesn't recognize any USB device as far as I can see, so that's why I thought it was strange that when I plug in my custom board with blinky, expecting nothing to happen, it says malfunctioned.

This is why I think it's a hardware problem on my side, but before I start messing with that I wanted to make sure there's no special procedure required to get it to work on a new chip, which would've been done in the production of the DK or whatever.

RE: USBD on a custom 52840 board

Turbo J — Tue, 23 Apr 2019 08:38:34 GMT

> is there any necessary procedure to get the USBD to function on a SoC fresh out of the box

Yes. You have to flash one of the USB example projects - otherwise the USBD hardware will not work.

Blinky example has no USB code.