avr/avrdude
2
0
Fork 0
mirror of https://github.com/mariusgreuel/avrdude.git synced 2025-09-27 22:45:27 +00:00
Code Issues Projects Releases Wiki Activity

Improve defaults and documentation of linuxspi

Browse Source 
* avrdude.conf.in: use @HAVE_LINUXGPIO_BEGIN/END@ and
@HAVE_LINUXSPI_BEGIN/END@ brackets around respective config
snippets; values were already set in configure.ac.
* linuxspi.c (linuxspi_open): Provide a reasonable (for the
Raspberry Pi) default for the -P option
* avrdude.1: Extend linuxspi documentation
* doc/avrdude.texi: (Dito.)



git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1496 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
Joerg Wunsch
2021-11-27 17:33:49 +00:00
parent 18fe8ef834
commit dd1255b0c8
6 changed files with 59 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
doc/avrdude.texi
View File

@@ -198,14 +198,30 @@ 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:
On a Raspberry Pi, header J8 provides access to the SPI and GPIO
lines.
@smallexample
avrdude -c linuxspi -P /dev/spidev:/dev/gpiochip[:resetpin]
@end smallexample
Typically, pins 19, 21, and 23 are SPI MOSI, MISO, and SCK, while
pins 24 and 26 would serve as CE outputs. So, close to these pins
is pin 22 as GPIO25 which can be used as /RESET, and pin 25 can
be used as GND.
A typical programming cable would then look like:
@multitable @columnfractions .15 .15 .3
@item @code{J8 pin} @tab @code{ISP pin} @tab @code{Name}
@item @code{21} @tab @code{1} @tab @code{MISO}
@item @code{-} @tab @code{2} @tab @code{Vcc - leave open}
@item @code{23} @tab @code{3} @tab @code{SCK}
@item @code{19} @tab @code{4} @tab @code{MOSI}
@item @code{22} @tab @code{5} @tab @code{/RESET}
@item @code{25} @tab @code{6} @tab @code{GND}
@end multitable
(Mind the 3.3 V voltage level of the Raspberry Pi!)
The @code{-P @var{portname}} option defaults to
@code{/dev/spidev0.0:/dev/gpiochip0} for this programmer.
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