Sorgelig wrote:I don't see why such connection may conflict.
Sorgelig wrote:Actually, there are many high powered HUBs providing extra current for devices like iPad and other tablets. It can be 2A or even 3A. So it will be enough for DE10-nano.
But I've missed the part about "fast charging ports."
I wouldn't recommend any source supporting fast charging as it can provide 9 to 13 volts over USB. Of course it starts to provide higher voltage after negotiation, so usually non-compatible devices won't get more than 5V. But you cannot be sure someday it won't mistakenly treat DE10-nano as fast charging device and bump the voltage. Not safe.
Sorgelig wrote:Fast chargers started to appear on USB2.0 devices (phones with micro-USB). Even my Samsung S8 with fast charge 3.0(or 4.0 - i forgot) comes with USB-A 2.0 charger. So, yes USB-A 2.0 connector is the common connector for fast chargers. Depends on phone, the cable may have micro-USB or USB-C.
Sorgelig wrote:I believe Qualcomm is the fast charger patent holder. I don' know if FC negotiation details are freely available. It's possible it may use a standard USB data communication to agree the power supply specs. There is special Qualcomm FC chip inside the phones.
FC voltage is variable. FC v2.0 uses 9V with 2A. FC v3.0 uses 13V (don't know about current). The current passed through USB has physical limit, that's why FC uses a higher voltage to overcome this limitation.
Since i don't see any usage of higher USB voltage for my devices, i never check precise details of FC and possibility to ask the PSU deliver it. Probably, internet can give you more details.
Sorgelig wrote:I'm not sure what you mean by power from USB. Since devices and cables involved in discussion are all USB - it's easy to confuse.
DE10-nano cannot be powered from micro-USB. Even in USB device mode it's impossible to power from USB.
You can power from microUSB only with hardware modification: viewtopic.php?f=117&t=32879
You've shown that USB to barrel adapter - so i've thought this is the cable you want to use to power the DE10-nano. If USB hub/AC adapter supplies enough power, then you can use this USB->barrel cable to power the DE10-nano.
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HUB Power brick ->Powered HUB->USB to Barrel connector->DE10-Nano barrel power socket
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┌-> USB to Barrel connector->DE10-Nano barrel power socket
HUB Power brick ->Powered HUB->|
└-> USB data cable->USB to micro USB OTG cable->DE10-Nano OTG Micro USB port
Sorgelig wrote:Usually USB hub has no power control on USB sockets, so the state of hub usually doesn't affect the power on USB ports. The reason why DE10-nano turning off while USB initialization is unclear. Probably it's not enough power supplied to DE10-nano and small fluctuations on power affect the stability of the board.
Foxie wrote:Did you measure the voltage on-load? It's possible that it drops to 4.4V which could upset the DE10-Nano. On the other paw, most FPGAs run from 3.3V and lower. In that case, you should be OK with a lower input voltage.
Foxie wrote:Is the hub data cable connected to the hub's host port, or one of the device ports? It's possible some hubs may switch the power to the device ports. Have you checked with a multimeter to see if the power is cycling?
Sorgelig wrote:With new USB host driver i use simple OTG HUB which obviously draw the power from DE10-nano and i have no problems to connect at the same time: RF receiver for keyboard, RF receiver for gamepag, wifi dongle and USB power to VGA splitter(!). I didn't use USB power mod.
So far so good. If you don't plan to power something powerful, then probably you don't need external power for USB hub. Try it.
Sorgelig wrote:There is one thing to mention: Current DE10-nano has revision C0 with revised USB power. It uses other chip for USB power. I have another DE10-nano with B2 revision and old USB circuit but i've modified USB power there and cannot test currently if new USB host driver is the one which really improved USB power or it's because new HW revision.
Locutus73 wrote:The USB data cable is connected to the hub's host port and to the DE10-Nano OTG port. I meant to use the HUB as DE10-Nano’s power source and HUB for keyboard and joypad dongles.
Locutus73 wrote:If I remember correctly I have a B2 revision; do I have to test the unpowered hub with the recent kernel you posted elsewhere?
Sorgelig wrote:With new USB host driver i use simple OTG HUB which obviously draw the power from DE10-nano and i have no problems to connect at the same time: RF receiver for keyboard, RF receiver for gamepag, wifi dongle and USB power to VGA splitter(!).
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