hi all, I have three blocks:
1. MESSAGE_LOADER reads a binary file and outputs it byte by byte to the next block (PACKET_CREATOR). On every 28th byte (and on the 0th byte) it adds tags denoting the start of a PDU 2. PACKET_CREATOR (tagged_stream_block) waits for 28 bytes to arrive. once this is accomplished, it reads the first of those 28 bytes and uses it for internal logic. the other 27 bytes are the payload of a packet, to which it prepends a header and appends a crc (2 bytes). NOTE: the length of the header in bits is not divisible by 8. because of this, in order to have the whole packet in one single chunk of memory, I have to do tedious bit shifting of the 27 payload bytes that come after the header.. once the packet is created, I want to pass it to the next block, containing tags in the first header byte. So, now I've changed things: before, the tags were 'connected' to the first payload byte. now, I want them to be 'connected' to the first header byte, which was created in this very block. 3. PACKET_VERIFIER (tagged_stream_block) for testing purposes, I want this block to receive the whole packet that was created in PACKET_CREATOR and write it to the screen. In order for the block to know when a packet starts, every first byte of a packet must contain the length of it. My question is this: I don't get this item enumeration thing in gnuradio. between the first 2 blocks it was easy enough, as I had to simply include tags in every 28th byte, and it is easy to picture item enumeration there (the first byte of the file has offset 0, the second one 1 etc). but how are the items enumerated between the PACKET_CREATOR and the PACKET_VERIFIER block?? which item index should I use to add the length tag to the first header byte?? I hope I have made myself sufficiently clear..if not, feel free to ask for more details. any help is immensely appreciated! thanks in advance! -- Posted via http://www.ruby-forum.com/. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
