On 7/18/23 20:00, andy pugh wrote:
I am looking at the possibilities of the gpiod library for Pi (and
other such devices)
I have flashed an led on my Pi400 with a bit of sample code:
********************************************************
#include <gpiod.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, char **argv)
{
const char *chipname = "gpiochip0";
struct gpiod_chip *chip;
struct gpiod_line *line1; // Red LED
int i, val;
// Open GPIO chip
chip = gpiod_chip_open_by_name(chipname);
// Open GPIO lines
line1 = gpiod_chip_get_line(chip, 17);
// Open LED lines for output
gpiod_line_request_output(line1, "example1", 0);
// Blink LEDs in a binary pattern
i = 0;
while (true) {
gpiod_line_set_value(line1, (i & 1) != 0);
usleep(100000);
i++;
}
// Release lines and chip
gpiod_line_release(line1);
gpiod_chip_close(chip);
return 0;
}
************************************************************
This requires libgpiod-dev to be installed, but also needs to be compiled with
gcc -libgpiod test.c or it does not compile.
I have very similar code in a .comp. This compiles, but on loading
into HAL I get the same error as the _compile_ time error with the
test code: " undefined symbol: gpiod_chip_open_by_name"
I have tried using:
option extra_compile args "-lgpiod";
in the .comp, and I have also tried adding '-lgpiod" to the makefile
(and then rebuilding LinuxCNC).
EXTRA_CFLAGS += -lgpiod
But so far with no success.
Any pointers?
************************************************************
component gpiod_test;
pin in bit _in;
author "andypugh";
license "GPL";
option extra_setup;
option extra_compile_args "-lgpiod";
function _;
;;
// sudo apt-get install libgpiod.dev
#include <gpiod.h>
const char *chipname = "gpiochip0";
struct gpiod_chip *chip;
struct gpiod_line *line11; // Red LED
EXTRA_SETUP(){
// Open GPIO chip
chip = gpiod_chip_open_by_name(chipname);
// Open GPIO lines
line11= gpiod_chip_get_line(chip, 11);
// Open LED lines for output
gpiod_line_request_output(line11, "example1", 0);
}
FUNCTION(_){
gpiod_line_set_value(line11, _in);
Andy, I wonder that by_name is the same as currently called by-id in
/dev/serial?
there is currently a udev bug in debian they have indicated will not be
fixed before trixie, so if you have serial devices, you get
/dev/serial/by-path but not /dev/serial/by-id, which is used by klipper
to assure klipper its not accidentally feeding your epson or hp printer.
so it is /dev/serial/*, if that is not a not found error, then add a /*
to the line. If by_path exists, but not by-id, your machine has the
bug. The temp fix is a script, pinned on "discord/klipper/configuration"
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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