Re: [Libusb-devel] Control transfers

[Nuno S. <ns...@ed...>]

Hi Tim,

I have this working already. I couldn't really found the problem.

I started to use some leds to see the value of the bmRequestType and it 
was delivering the right value sent by the host.

Then i started to make the inverse process, and putting it right in place.

I have this fully working now.

Just for the records:

EVENT_HANDLER(USB_UnhandledControlPacket)
{
    // Handle specific control requests
    switch (bRequest)
    {
        case REQ_MY_REQUEST:
            if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_VENDOR | 
REQREC_DEVICE) )
            {
                // do stuff          
              
                // Acknowedge the SETUP packet, ready for data transfer
                Endpoint_ClearSetupReceived();
               
                // Send an empty packet to acknowedge the command
                Endpoint_ClearSetupIN();
            }           
            break;
}

In the libusb side:

int sendRequest(uint8_t request)
{
    int r;
   
    r = libusb_control_transfer(handle, CTR_OUT, request, 0, 0, NULL, 0, 
1000);
   
    if (r < 0) {
            fprintf(stderr, "set mode error %d\n", r);
            return r;
    }
   
    return 0;
}

Where

#define CTR_OUT                         0x40
#define REQ_MY_REQUEST        0x00

Thank you very much,

With my best regards,

Nuno


Tim Roberts wrote:
> Nuno Santos wrote:
>   
>> I'm claiming interface before setting mode:
>>   
>>     
>
> That shouldn't be necessary, strictly speaking, although it won't hurt,
> either.
>
>   
>> This is my device side control packets handling (LUFA syntax):
>>
>> case 0x12:
>>             if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_VENDOR | 
>> REQREC_DEVICE))
>>             {
>>                 Endpoint_ClearSetupReceived();
>>
>>                 PORTD ^=0xff;
>>                
>>                 /* Send the flag to the host */
>>                 Endpoint_ClearSetupOUT();
>>             }
>>            
>>             break;
>>   
>>     
>
> There are apparently several different versions of the LUFA library, so
> I can't actually verify whether this is the intended sequence or not. 
> Quite a number of the existing samples use   Endpoint_ClearSetupIN(); 
> for a host-to-device request.  This is backwards from intuition, because
> in USB the terms "IN" and "OUT" are almost exclusively used from the
> point of view of the host.
>
> The LUFA documentation from June 2009 only shows Endpoint_ClearSETUP,
> with no distinction between IN and OUT.
>
>