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patch #7165 Add support for bitbanging GPIO lines using the Linux sysf GPIO interface

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* doc/avrdude.texi,avrdude.1: added doc for linuxgpio 
	* avrdude.conf.in: added template for linuxgpio programmer
	* config_gram.y: pin numbers restricted to [PIN_MIN, PIN_MAX]
	* pindefs.h: added PIN_MIN, PIN_MAX, removed unused LED_ON/OFF
	* configure.ac: configure option enable-linuxgpio, print of enabled options
	* linuxgpio.[ch]: new source for linuxgpio programmer
	* Makefile.am: added linuxgpio to sources list
	* pgm_type.c: added linuxgpio to programmer types list

git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1132 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
Rene Liebscher
2013-01-09 19:23:30 +00:00
parent 76df1b5b6e
commit 274c518121
12 changed files with 495 additions and 6 deletions
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avrdude.1
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@@ -98,6 +98,18 @@ port.
Connecting to a serial port emulated on top of USB is likely to not
work at all, or to work abysmally slow.
.Pp
If you happen to have a Linux system with at least 4 hardware GPIOs
available (like almost all embedded Linux boards) you can do without
any additional hardware - just connect them to the MOSI, MISO, RESET
and SCK pins on the AVR and use the linuxgpio programmer type. It bitbangs
the lines using the Linux sysfs GPIO interface. Of course, care should
be taken about voltage level compatibility. Also, although not strictrly
required, it is strongly advisable to protect the GPIO pins from
overcurrent situations in some way. The simplest would be to just put
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
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