URL:
<http://savannah.nongnu.org/bugs/?46587>
Summary: patch: transparent SPI (relay) mode
Project: AVR Downloader/UploaDEr
Submitted by: None
Submitted on: Wed 02 Dec 2015 07:30:22 AM UTC
Category: None
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name: Tibor 'Igor2' Palinkas
Originator Email: [email protected]
Open/Closed: Open
Discussion Lock: Any
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Details:
(This is not a bug report but a patch for a new feature. This was the
only tracker I could add it to without registration.)
In my next open source hardware project I program an attiny to be an SPI
slave. I figured the easiest way to test the firmware would be to use my
parallel port avr programmer device to emulate an SPI bus master. For this
I need avrdude to be able to:
- avoid resetting the target device
- omit any SPI commands related to AVR programming during initialization
- initiate arbitrary long SPI transactions
The patch attached implements this in the following steps.
1. a new device flag AVRPART_NO_RESET can disable the reset signal
normally generated for no-tpi devices
2. a new device configuration called "spi" or "transparent_spi" defines
a device that omits the reset and all SPI communication during initialization
3. a new command line switch -S puts avrdude in transparent SPI mode
4. in transparent SPI mode binary data is relayed between stdio and SPI until
EOF on stdin.
I've tested it with a parallel port programmer and a scope, with
MISO-MOSI looped back with a wire, left unconnected or an attiny2313
connected. Both the transparent SPI mode and programming the attiny worked.
I have no idea if it works with non-bitbang programmers.
Command line for the transparent SPI mode: avrdude -c <whatever> -p spi -S
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File Attachments:
-------------------------------------------------------
Date: Wed 02 Dec 2015 07:30:22 AM UTC Name: SPI.patch Size: 9kB By: None
svn diff in trunk/avrdude
<http://savannah.nongnu.org/bugs/download.php?file_id=35611>
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