Posted on May 17, 2011 at 14:23I've been able to get it to work. There are some things which seem to be not necessary for HID or MSC devices and these are probably untested.
USBH_CtlReq() (the high-level function doing a control transfer) does not work if you want to actually send data to the device. It works only when you want to fetch some data. So I did some ugly workaround and sent the ControlSetup and ControlData packets myself using host channel zero:
buf[0] = 0x21; buf[1] = 0x09; buf[2] = 0x00; buf[3] = 0x02; buf[4] = 0x00; buf[5] = 0x00; buf[6] = 0x08; buf[7] = 0x00; status = USBH_CtlSendSetup(pdev, buf, 0);
buf[0] = 0x05; buf[1] = 0xAF; buf[2] = 0x01; buf[3] = 0x00; buf[4] = 0x02; buf[5] = buf[1] ^ buf[2] ^ buf[3] ^ buf[4]; buf[6] = 0xAF; buf[7] = 0xFE;
status = USBH_CtlSendData(pdev, buf, 8, 0);
In both cases I only need to call the function once and I immediately get a USBH_OK back.
Although the packets are sent correctly most of the time, quite often the station does not repeat anything back. If it doesn't respond almost immediately, I can send as many request packets as I want, I will never get an answer.
The only workaround seems to return USBH_UNRECOVERED_ERROR, which reconnects the usb device, causing a complete new enumeration and initialization. Then it may work, although the chance of failing is the same as before (3 out of 10 times it won't).
I suspect the control packet is sent wrongly, but I do not have the equipment to check things on the wire.
I hope this helps someone facing the same problem.
Best regards
