[avrdude-dev] [bug #30559] Ft232 bit-bang support

[Roger Wolff]

Follow-up Comment #2, bug #30559 (project avrdude):

Joerg, 

The FTDI is a funny chip. It will output the "bitbang" bytes (you always give
it a full byte, even if you're changing just one bit), at any rate you want.
So the patch that's available (I'll find you an URL later on). will adapt the
setting of the FTDI chip to whatever bitrate you spedcify with -B. 

It programs my atmega168 about 10x faster than my 19200 baud STK500V2
compatible programmer (which is based on the same atmega168, which due to
clock division reasons doesn't work reliably above 19200). 

So NO, I don't think bitbanging is slow. 

I have a board where the FTDI control lines are permanently connected to the
programming pins of my atmega on the board. With Arduino you'll have to make a
small patch cable from the ftdi-control-pins-header that some boards have to
the AVR-programming header. 

Here is a page with a "howto" that worked for me. It links to the patch... 
http://www.geocities.jp/arduino_diecimila/bootloader/index_en.html


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