ESPUSB32 Full-speed USB Approach

[cnlohr]

If you pass that 3 I2S engines on, it would also be super cool if one or a few of them could exceed the 80 MHz barrier. Seems like nothing I can do can do that. Not that there's any /real/ use for it, but you can do some fun/wacky stuff if that becomes possible, especially if the apll is going to have all of its terms. Think NTSC Broadcast + Audio :-p

(kind of kidding)

[nicolas]

Thanks for your consideration Sprite, and we know that cnlohr is not kidding at all : he just needs another carrier for TV transmission (or GSM, GPS, fibre channel, VR lighthouses or whatever) so while you're at it, for the same price, make it 10 x I2S, please ! with dedicated CPU cores, and a reconfigurable matrix of many high-speed DACs so he can stop jamming his neighbourhood with nasty harmonics !

[amoose136]

Was any more progress made on this? If it's possible to make the esp32 software emulate mass storage I am very interested although I suspect additional hardware will be necessary.

[beni0664]

@ESP_Sprite

Did you have any success on an RMT implementation / proof-of-concept ?

If it is possible, could you share your code anyway? I'm looking forward to fiddle around with USB ^^

[Deouss]

Hi, I stumbled across this thread because it is very interesting. I am planning a project involving classic USB devices that will be connected to embedded system and also use mcu as usb device connecting to PC and exchanging data.
I wonder how fast 2K/4K cameras are connected via usb and what controls the host-client transfer.
I'd say solution would be some kind of mapping external memory to mcu and just read/write to it without any significant latencies.
This is kind of similar problem if you want to connect f.ex laptop retina panel to mcu board.
It was done with success but it is almost like hacking the higher lcd technology.
As for USB that must be done I guess on much lower level using differential transmission pair for data with best transfer scenario as described here http://www.beyondlogic.org/usbnutshell/usb4.shtml
Im just starting this journey but Im sure there are more advanced people who could help here.
Cheers

[rudi ;-)]

If you pass that 3 I2S engines on, it would also be super cool if one or a few of them could exceed the 80 MHz barrier. Seems like nothing I can do can do that. Not that there's any /real/ use for it, but you can do some fun/wacky stuff if that becomes possible, especially if the apll is going to have all of its terms. Think NTSC Broadcast + Audio :-p

(kind of kidding)

are 600 MHz not enough ? ( I2S using apll=yes )
(kind of sincerity)



you can do VGA mode with it example at 580 MHz

for your reference for free using ( no esp32lib like the vga mode ) :

esp32-apll-calc_i2s_using_apll.jpg (149.04 KiB) Viewed 9130 times

esp32-apll-calc_i2s_using_apll_2.png (52 KiB) Viewed 9130 times

hope this helps for your to do some fun/wacky stuff



best wishes
rudi