YModem data upload utility

Rayman

Here's a version of my Ymodem code that lets you upload recorded data as a file.

There are two test proceedures, one uploads data as a text file and the other uploads as a binary file...

Just be careful when disconnecting Hyperterminal because it can cause your Prop to reset...

pgbpsu

Rayman-

This utility is terrific, albeit slow. If one wanted to speed it up, where would you suggest they start?

Thanks,
pb

Rayman

Easy way is change the baud from 9600 to 115200...

pgbpsu

Rayman-

Thanks for the quick response.

When I posted this question, I mistakenly put it under the wrong thread. When I went back and looked at the code I'm using, I found I'm using your YModem(alpha) program


http://forums.parallax.com/showthread.php?p=718391


It appears the baudrate is already set to 115200 right at the of the top program, yet I only get about 1500cps (according to the YModem download dialog box). I don't see any other place where the baudrate is reset. Does this mean the bottleneck is reading from the SD card? If you have suggestions on where I start to optimize I'd really appreciate it.

Thanks again for the great utility.
pgb

Rayman

Well, it would probably have to be partially converted to assembly to get much faster... That's assuming that the waiting for Hyperterminal to send an ACK isn't the holdup. 1500cps is ~15000 bps, so there's a possible improvement of about 7X.

Reading the SD card is not the bottleneck. I would imagine that making the CRC might be one slow point. Also, I'm sending out bytes one at a time to the fullduplex object, this could definitely be optimized, probably by sending a pointer and the #of bytes to send instead...

You could also try using 230400 baud, but that might not work...