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);
}
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912
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