[avrdude-dev] [patch #6484] Software control for USBasp ISP speed

[Jurgis Brigmanis]

URL:
  <http://savannah.nongnu.org/patch/?6484>

                 Summary: Software control for USBasp ISP speed
                 Project: AVR Downloader/UploaDEr
            Submitted by: velko
            Submitted on: Sunday 03/30/2008 at 19:54
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Patches for Avrdude and USBasp firmware, to add software control over ISP SCK
frequency from 1.5 MHz down to 500 Hz.

Patches are against latest released USBasp firmware version
(2007-10-23) and Avrdude's CVS version (as of 29.03.2008).

Bitclock period, specified using -B switch, is rounded 
to closest available frequency:
* less than 0.5 or none - default speed (jumper setting)
* 0.5 - 1.0 -> 1.5 MHz
* 1.0 - 2.0 -> 750 kHz
* 2.0 - 4.0 -> 375 kHz
* 4.0 - 8.0 -> 187.5 kHz
* 8.0 - 20.96 -> 93.75 kHz
* 20.96 - 46.88 -> 32 kHz
* 46.88 - 93.75 -> 16 kHz
* 93.75 - 187.5 -> 8 kHz
* 187.5 - 375.0 -> 4 kHz
* 375.0 - 750.0 -> 2 kHz
* 750.0 - 1500.0 -> 1 Khz
* more than 1500.0 -> 500 Hz

Doesn't break forward/backward avrdude/usbasp compability 
(at least I hope so ;)) - firmware just falls back to jumper setting.



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File Attachments:


-------------------------------------------------------
Date: Sunday 03/30/2008 at 19:54  Name: avrdude.diff  Size: 2kB   By: velko

<http://savannah.nongnu.org/patch/download.php?file_id=15363>
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Date: Sunday 03/30/2008 at 19:54  Name: usbasp.diff  Size: 4kB   By: velko

<http://savannah.nongnu.org/patch/download.php?file_id=15364>

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