Wouldn't it make sense to have a conversion function in usb.c, something like:
It hasn't been necessary so far, which is why I didn't bother defining one last summer when this came up. There aren't many ISO devices/driver; and ones using interrupt transfers can just as easily call usb_fill_int_urb() to address this issue.
That is, if they don't do the shift themselves, which lets them deal better with periods like 2 uframes (1/4 msec).
inline int bInterval_to_ms(unsigned char bInterval, int speed, int isoc)
{
if (USB_SPEED_HIGH == speed)
return (2^(bInterval-1)) * 125;
else if (isoc)
return (2^(bInterval-1));
else
return bInterval;
}
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