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| xobs | Well, hubs already kinda have bitbang-able GPIOs. Or at least, GPOs. If it's wired up, you can toggle power on individual hub ports. And toggle the LED, too. | 04:48 |
|---|---|---|
| xobs | Here's the source for novena-usb-hub which toggles port power: https://github.com/xobs/novena-usb-hub/blob/master/novena-usb-hub.c | 04:49 |
| tpb | Title: novena-usb-hub/novena-usb-hub.c at master · xobs/novena-usb-hub · GitHub (at github.com) | 04:49 |
| MadHacker | Aye, but the big smoothing capacitors on the power rails somewhat interfere with trying to carry data on it, even assuming you're not already using it for power. :) | 06:13 |
| MadHacker | I suspect that the test modes on most USB devices would probably do it, but they're not standardised at all. | 06:14 |
| xobs | MadHacker: Power rails, yes. But the LEDs are also able to be controlled, assuming those pins are wired up. | 06:27 |
| MadHacker | Is the interface for those standardised? | 06:28 |
| MadHacker | If so, a hacker's hub that brought them out to 0.1" header would be ridiculously cheap and easy to make. :) | 06:29 |
| MadHacker | Still couldn't use it as an assumed-to-be-there rescue mode thing, but nonetheless, handy. | 06:30 |
| xobs | Man, the USB specification is complex. And Chapter 11 is longer than every other chapter combined. | 06:33 |
| xobs | Having said that, PORT_INDICATOR hs the feature you're looking for. You can then set some other bits to actually control the LED. | 06:34 |
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