[patch #10017] uspasp / tpi: Automatically clear configuration byte (fuse) before writing it

[Martin Thierer]

URL:
  <https://savannah.nongnu.org/patch/?10017>

                 Summary: uspasp / tpi: Automatically clear configuration byte
(fuse) before writing it
                 Project: AVR Downloader/UploaDEr
            Submitted by: thierer
            Submitted on: Sun 31 Jan 2021 02:29:23 PM UTC
                Category: None
                Priority: 3 - Low
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

For the ATtiny 4/5/9/10 MCUs the "configuration byte" (fuse byte) has to be
erased before it can be changed (see 16.4.3.4 in the datasheet).

Respective support has been added for the usbasp programmer via #9185, but
through extended parameters for the erase command.

I find it much more useful to just transparently erase the configuration byte
before writing it, like avr_write_byte_default() does (which isn't used by the
usbasp code).

The attached patch adds that functionality. Tested with an ATtiny 10.





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File Attachments:


-------------------------------------------------------
Date: Sun 31 Jan 2021 02:29:23 PM UTC  Name: reset-configuration-byte.patch 
Size: 930B   By: thierer

<http://savannah.nongnu.org/patch/download.php?file_id=50814>

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