[Discuss-gnuradio] setting fields in the USB packet

[George Nychis]

Heyo,

Eric, I think you started to mention something about this last night.  But do we 
want a separate method for setting each field in the USB packet?  There are 
several fields that we won't ever need to set on our end, only need to read. 
For instance, the dropped packets field.

So heres what i'm thinking:

// Create the payload
//   'packet_ptr' is a pointer to a USB packet in memory
//   'samples'    is a vector of unsigned char
//
//   the payload can be inferred from the samples and inserted in to the packet
//
//   the method should also pad the payload

usb_set_payload(packet_ptr, samples)


// Set the timestamp
//
// 'packet_ptr' is a pointer to a USB packet in memory
// 'timestamp' is a 32 bit int

usb_set_timestamp(packet_ptr, timestamp)


// Set the channel
//
// 'packet_ptr' is a pointer to a USB packet in memory
// 'channel'    is an integer
//
// Should this also error check on the channel number? (5-bit limit)

usb_set_channel(packet_ptr, channel)


// Set the start of burst flag
//
// 'packet_ptr' is a pointer to a USB packet in memory
//
// This just needs to flip a bit

usb_set_start_of_burst(packet_ptr)


// Set the end of burst flag
//
// 'packet_ptr' is a pointer to a USB packet in memory
//
// This just needs to flip a bit

usb_set_end_of_burst(packet_ptr)


Discussion:
-----------

Do we need methods to unset burst flags?  I don't see a need for them.

Should we have a method to zero out the packet?  Or are we just going to just 
use low level memory clearing methods?

- George