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Jul 30, 2007, 12:28 PM
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file uploads over 72Mhz

Got file uploads over 72Mhz working. The nominal bitrate is 400 bits/sec. The longer the file, the lower the bitrate. The maximum file size is only 520 bytes. The entire file must be stored in the transmitter SRAM. The pilot needs to run a utility to stock the transmitter SRAM with packets. The transmitter rebroadcasts the packets over and over while Vicacopter reassembles them into a file. Vicacopter's status LED freezes a solid green when a complete file has been received. When the pilot kills the utility, the transmitter returns to flight control data.

Through gzip compression, sending a 1000 byte file. The bitrate with compression is 3kbit. Forget about firmware replacement with this. It's only uploading PID constants. Longer files could be supported, but it would be extremely complicated and slower.

Unfortunately, it's the end of configuration by dumb terminals until the XBee upgrade.
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