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

[René Liebscher]

Hi,

 

on the mentioned web page only the ft232/245 bit bang mode is used. 

 

But I had a closer look in the linked serjtag-0.3.zip. The serjtag is an
ft245r which is connected to an attiny2313 in parallel mode. And this attiny
implements a protocol to write/read SPI data. The SPI data are connected to
lines named the usual JTAG names, so its primary purpose is obviously to be
used as JTAG debugger. But as ISP is also SPI it can be used for this
purpose too. From avrdude’s point of view it implements a serial protocol
(which goes over USB to the FT245r and over parallel to the attiny, so it is
probably faster than any real serial connection in between) 

 

The ft245r patch was later added on a patched avrdude (which already had
added the serjtag patch). So everyone who wanted to use the ft245/233r
bitbang mode had always downloaded the serjtag patch too. And at putting the
the patch in avrdude’s patch tracker, the two different patches became one.

 

So if you really have this serjtag programmer for testing we can add it with
this patch, otherwise we should left it out and may be move it in a separate
patch.

 

Kind regards

 

René Liebscher

  _____  

Von: address@hidden [mailto:address@hidden Im Auftrag von David
Harris
Gesendet: Dienstag, 17. Januar 2012 01:58
An: Rene Liebscher
Cc: Rene Liebscher; Roger Wolff; Joerg Wunsch; address@hidden
Betreff: Re: [bug #30559] Ft232 bit-bang support

 

Hi--

 

I think sertag is referring to this Arduino project:
http://www.geocities.jp/arduino_diecimila/bootloader/index_en.html

 

Explanation: Arduinos usually use a serial bootloader to load 'Sketches'
into the hardware.  However, in the unfortunate event that the bootloader is
damaged, the user is forced to use ICSP (in circuit serial programming) or
high-voltage programming.  This involves additional hardware. 

 

Fortunately, many Arduino boards use the FT232RL for usb-serail, and with a
little jumpering, this can be used to program the raw mpu. Some boards, eg
the LEDuino (www.siliconrailway.com), have hardware that connects the
appropriate FT232RL lines to the ICSP.  

 

I have the resources to test the patch, and would be glad to do so.  

 

David Harris

 

On Mon, Jan 16, 2012 at 12:44 PM, Rene Liebscher <address@hidden>
wrote:

Follow-up Comment #8, bug #30559 (project avrdude):

I think we should left out serjtag, until anybody comes up with references
what this programmer is and is willing to test it.

   _______________________________________________________

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