Comment on command line util to encode/decode framed packets?
nycki@lemmy.world 3 months agoI tried that first! But tar complains if it can’t find the file header! So I still need to do some sort of packets. Unless you know some sort of workaround?
pc486@sh.itjust.works 3 months ago
You’re probably decoding noise or in the middle of the bit stream.
What you’re looking for is called “preamble.” That’s a sequence of bits used to synchronize the decoder (marks the start of data, useful in modulation schemes for clock recovery, and a few other things).
Looking at minimodem’s manual, try using the sync-byte option. Prepend your tar stream with a string of bytes, like 0x01, before sending to minimodem for encoding. Then use the sync code option to mark the start of the tar bit stream. This is as simple as cat preamble.bin myfiles.tar | minimodem --tx …
Other things to consider: start small with 300 baud BFSK before speeding up. Test with wav files before attempting physical tape or speakers and a microphone.