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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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27
doc/avrdude.texi
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@@ -180,6 +180,33 @@ 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.
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 @code{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.
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 @code{reset} GPIO
number accordingly. Linuxspi can be used as follows:
@smallexample
avrdude -c linuxspi -P /dev/spidev:/dev/gpiochip[:resetpin]
@end smallexample
The STK500, JTAG ICE, avr910, and avr109/butterfly use the serial port to communicate with the PC.
The STK600, JTAG ICE mkII/3, AVRISP mkII, USBasp, avrftdi (and derivatives), and USBtinyISP
programmers communicate through the USB, using @code{libusb} as a