Navtez Singh (be00078@bbsbec.org) wrote:
> i wrote a function as follows:
>
> /*structure: */
>
> struct usb_IrDA {
> struct usb_device * udev; /* save off the usb device pointer */
> struct usb_interface * interface; /* the interface for this device */
> char num_bulk_in; /* number of bulk in endpoints we have */
> char num_bulk_out; /* number of bulk out endpoints we have */
>
> unsigned char * bulk_in_buffer; /* the buffer to receive data */
> int bulk_in_size; /* the size of the receive buffer */
> __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
>
> unsigned char * bulk_out_buffer; /* the buffer to send data */
> int bulk_out_size; /* the size of the send buffer */
> struct urb * write_urb; /* the urb used to send data */
> struct urb * read_urb; /* the urb used to recieve data */
> struct urb * ctrl_urb; /* the urb used to perform control operations */
> unsigned char* setup_packet;
> __u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
>
> int open_count; /* number of times this port has been opened */
> struct semaphore sem; /* locks this structure */
> unsigned char *ctrl_buf; /* conrol buffer: for sending control messages */
> };
>
>
> /*function:*/
>
> static int stir_write(struct usb_IrDA *IrDA_dev, unsigned short reg,
> unsigned char value)
> {
> int ret;
> FILL_CONTROL_URB(IrDA_dev->ctrl_urb, IrDA_dev->udev,
> usb_sndbulkpipe(IrDA_dev->udev, IrDA_dev->bulk_out_endpointAddr),
> IrDA_dev->setup_packet,value,1,
> IrDA_write_ctrl_callback, IrDA_dev);
>
> ret=usb_submit_urb(IrDA_dev->ctrl_urb);
>
> return ret;
> }
> /* end of function */
>
> /* this function has been called continously four times, but not in loop*/
>
>
> it doesn't work ... i dont why ?
It doesn't work ? doesn't compile ?
Does your urb is allocated ??
Does the length of the transfer buffer shouldn't be a sizeof(value) ?
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