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patch #9816: Implement new programmer type: linuxspi

Browse Source 
* linuxspi.c: (New file.)
* linuxspi.h: (New file.)
* Makefile.am: Add new files
* configure.ac: Add "linuxspi" --enable option
* avrdude.conf.in: Add "linuxspi" programmer template
* pgm_type.c: Include linuxspi programmer
* doc/avrdude.texi: Document new programmer
* avrdude.1: (Dito.)

Submitted by Ralf Ramsauer



git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1447 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
Joerg Wunsch
2020-09-19 21:32:38 +00:00
parent 9b3762a812
commit 40b0b104d6
10 changed files with 456 additions and 2 deletions
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32
avrdude.1
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@@ -1,6 +1,6 @@
.\"
.\" avrdude - A Downloader/Uploader for AVR device programmers
.\" Copyright (C) 2001, 2002, 2003, 2005 - 2016 Joerg Wunsch
.\" Copyright (C) 2001, 2002, 2003, 2005 - 2020 Joerg Wunsch
.\"
.\" This program is free software; you can redistribute it and/or modify
.\" it under the terms of the GNU General Public License as published by
@@ -18,7 +18,7 @@
.\"
.\" $Id$
.\"
.Dd DATE February 15, 2016
.Dd DATE September 19, 2020
.Os
.Dt AVRDUDE 1
.Sh NAME
@@ -109,6 +109,34 @@ some resistors in series or better yet use a 3-state buffer driver like
the 74HC244. Have a look at http://kolev.info/avrdude-linuxgpio for a more
detailed tutorial about using this programmer type.
.Pp
Under a Linux installation with direct access to the SPI bus and GPIO
pins, such as would be found on a Raspberry Pi, the ``linuxspi''
programmer type can be used to directly connect to and program a chip
using the built in interfaces on the computer. The requirements to use
this type are that an SPI interface is exposed along with one GPIO
pin. The GPIO serves as the reset output since the Linux SPI drivers
do not hold slave select down when a transfer is not occuring and thus
it cannot be used as the reset pin. A readily available level
translator should be used between the SPI bus/reset GPIO and the chip
to avoid potentially damaging the computer's SPI controller in the
event that the chip is running at 5V and the SPI runs at 3.3V. The
GPIO chosen for reset can be configured in the avrdude configuration
file using the
.Li reset
entry under the linuxspi programmer, or
directly in the port specification. An external pull-up resistor
should be connected between the AVR's reset pin and Vcc. If Vcc is not
the same as the SPI voltage, this should be done on the AVR side of
the level translator to protect the hardware from damage.
.Pp
A commented-out template for this programmer is provided in the
avrdude configuration file. To use it, clone that entry into the
per-user configuration file, and configure the
.Li reset
GPIO
number accordingly. Linuxspi can be used as follows:
.Dl avrdude -c linuxspi -P /dev/spidev:/dev/gpiochip[:resetpin]
.Pp
Atmel's STK500 programmer is also supported and connects to a serial
port.
Both, firmware versions 1.x and 2.x can be handled, but require a