On 06/29/2014 10:49 AM, GP 2014 wrote: > Dear all , > I use a flowgraph containing : File source , OFDM TX ,throttle, File > sink (I will replace then the file sink by UHD sink to try with USRP) > I got this error message > > FATAL: Missing a required length tag on port 0 at item #0 > thread[thread-per-block[1]: <block crc32_bb (14)>]: Missing length tag. > > I tried to solve this problem but I failed : > in TX in the field called length tag name , > I tried to write same input to this field as in the loopback : > I wrote in this field : len_tag_key > Then I put a variable block with ID :len_tag_key , with value : "packet_len" > Then I put another variable block with ID: packet_len , with value:87 > > Also I tried to write in this field : packet_len & put only one variable > block with ID packet_len & value:87 .. I got the same error !! > What is must be written in this field ?!!!
You must provide a key for the tagged stream tags. Read http://gnuradio.org/doc/doxygen/page_tagged_stream_blocks.html and the OFDM examples. M _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
