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AVRDUDE: using -B bitclock
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AVRDUDE: using -B bitclock

by Russell 27 on Mon Apr 14, 2014 11:23 am

I believe I am using AVRDUDE V5.5. While using the 32,768 crystal as my main clocking source, low fuse A5, I am no longer able to communicate with my ATMEGA 168 or 328 using AVRDUDE. I've tried setting to -B 32 and higher, no result. I have tested with the 8 Mhz internal clock, and speed definitely is changed using -B setting. I have another programmer that is capable of an 8 Khz programming speed, 1/4 the 32.278 Khz crystal, and it works fine. Is this possible with AVRDUDE.
Russell 27
 
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Re: AVRDUDE: using -B bitclock

by jarchie on Mon Apr 14, 2014 4:27 pm

The -B 32 parameter mentioned would be way too fast. The -B option specifies the bitrate in microseconds, so an 8 kHz signal would have a bitrate of 1 / 8,000 or 128 microseconds. Did you try a bitrate of 128 (-B 128) or greater?

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