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Yusuf Celik
@YusufCelik
case EXCEEDS_DEVICE_CAPACITY:
maybe the reference manual will clarify how they push the len specifier into what part of a special usb register
dxld
@dxld:it-syndik.at
[m]
that's what USB_SET_EP_TX_COUNT does
it just writes into some register yeah
I think what you want to do to debug this is check the write return value
if it's 0 then the write didn't go though and that's why your host is stuck
(assuming you don't pass in len=0)
Yusuf Celik
@YusufCelik
yeah, I could look into that
dxld
@dxld:it-syndik.at
[m]
that shouldn't happen if you just got an IN callback tough
Yusuf Celik
@YusufCelik
I still wonder whether you and I are on the right track with regards to our assumptions
we thought we could just simply keep pushing data via the callback
but was that how libopencm intended to support usb transfers
dxld
@dxld:it-syndik.at
[m]
I mean I implemented a working production usb device using this code and I got the code right here :)
Yusuf Celik
@YusufCelik
I also found thi
there is a part that is interrupt based and has a similar idea to ours:

```static void bulk_tx_cb(usbd_device * usbd_dev, uint8_t ep)
{
char buf[64] attribute ((aligned(4)));

(void)ep;

/* Keep sending packets */
usbd_ep_write_packet(usbd_dev, 0x82, buf, 64);

}```

"keep sending packets" <<< evidenced by this
dxld
@dxld:it-syndik.at
[m]
and I read the ST peripheral register docs multiple times over, though I guess mine was _v2 on a STM32F0 instead of _v1 hmm
Yusuf Celik
@YusufCelik
wish I had the host code for this
dxld
@dxld:it-syndik.at
[m]
did you have a look at the gadget0 test/example code?
that has a host side thing too you can play with
Yusuf Celik
@YusufCelik
hopefully they do not say "look example for bulk transfers" let's just write 64bytes!!!!
haha
dxld
@dxld:it-syndik.at
[m]
perhaps, not sure :)
Yusuf Celik
@YusufCelik
(facepalm; but I can already do that. I just need an example that exceeds that number and performs at speed)
one thing though: this thing started because I almost felt like I had 9600bps speeds (worse than serial)
dxld
@dxld:it-syndik.at
[m]
it's still worth a look I think
Yusuf Celik
@YusufCelik
initially, when I used my HOST -> request -< MCU send data loop (4096) to send 256kb
dxld
@dxld:it-syndik.at
[m]
it runs a bunch of different tests
Yusuf Celik
@YusufCelik
4096 times of 64bytes was abysmally slow
but was it due to the implementation or some hidden flaw
(well, you used the blue pill built-in usb connector, that one only does usb 1.0)
(you should have made an external usb connector via the gpio pinouts)
dxld
@dxld:it-syndik.at
[m]
I guess it's also possible your descriptors are just wrong
if, for example, you set your EP to be of interrupt transfer type you could get a trickle of only 64b per milisecond :)
Yusuf Celik
@YusufCelik
Screen Shot 2022-06-19 at 10.40.54 AM.png
the mac assumes a 12mb/s speed
let me double check bmAttributes
0x02 = assuming this is bulk transfer because
Bits 0..1 Transfer Type 00 = Control 01 = Isochronous 10 = Bulk 11 = Interrupt Bits 2..7 are reserved. If Isochronous endpoint, Bits 3..2 = Synchronisation Type (Iso Mode) 00 = No Synchonisation 01 = Asynchronous 10 = Adaptive 11 = Synchronous Bits 5..4 = Usage Type (Iso Mode) 00 = Data Endpoint 01 = Feedback Endpoint 10 = Explicit Feedback Data Endpoint 11 = Reserved
dxld
@dxld:it-syndik.at
[m]
I'd check lsusb -v on the host to be extra sure (that's a linux thing though)
Yusuf Celik
@YusufCelik
lsusb Speed: Up to 12 Mb/s
dxld
@dxld:it-syndik.at
[m]
-v would give you a Device Descriptor: readout
that decodes bmAttributes among other things
but whatever 0b10 seems right
Alexander Voronov
@crvux
Hello!
There is exist some tool to generate initialization code like CubeMX but for libopencm?