URL:
<http://savannah.nongnu.org/bugs/?41631>
Summary: TPI bitbang for preprogrammed ATtinys can fail
(Patch attached)
Project: AVR Downloader/UploaDEr
Submitted by: microtherion
Submitted on: Tue 18 Feb 2014 01:13:56 PM GMT
Category: None
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name: Matthias Neeracher
Originator Email:
Open/Closed: Open
Discussion Lock: Any
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Details:
If an ATtiny4/5/9/10 has been programmed with software that sets PB0 (a.k.a
TPIDATA) as an output, this will interfere with the MOSI -> MISO connectivity
test when avrdude tries to reprogram the MCU.
The simplest solution, it seems to me, is to hold RESET low during the
MOSI->MISO test. I’ve attached a patch implementing this, which works for me
(Using a Buspirate as the programmer).
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File Attachments:
-------------------------------------------------------
Date: Tue 18 Feb 2014 01:13:56 PM GMT Name: bitbang,patch Size: 554B By:
microtherion
<http://savannah.nongnu.org/bugs/download.php?file_id=30594>
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