Re: [Libusb-win32-devel] usb_bulk_read return -22

[Ze H. Z. <ze....@ma...>]

Hi All
I made mistake on claim usb interface
{
    int state = usb_set_configuration(*deviceHandle, configurationValue);
    return state<0? usb_claim_interface(*deviceHandle, interfaceid):state;
}
fixed, bulk_read works fine


On Wed, 1 Apr 2020 at 17:28, Ze Hou Zhang <ze....@ma...> wrote:

> Hi All
> I dont have a lot experience for developping embedded system.
> I encounter this problem
> My hardware is :
>         int vid = 0x24aa;
>         int pid = 0x1000;
>         std::string firmwarePartNum = "170003";
>         std::string firmwareDesc = "FX2 USB Board";
>         bool isSupported;
>         unsigned int defaultPixels = 1024;
>         unsigned int spectraBlockSize = 1024 * 2;
>         unsigned int usbDelayMS = 0;
>         bool hasDefaultTECSetpointDegC = false;
>         int defaultTECSetpointDegC = 0;
> =============================================================
>            int size = 512;
>             char* buf = new char[size];
>             int endpoint = 130;
>             int timeout = 150;
>
>             int isok = usb_bulk_read(*deviceHandle, endpoint, bytes, size,
> timeout);
>
>            Output:  ok = -22
> Thanks
>

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