Interrupt code besides wiringpi and pascalio
lazarus / 32-Linux

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pascalbythree · 2022-03-12 17:23

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i program
Project1;uses fpgpio;var  pin_21: TGpioPin;  NewValue: Boolean;begin 
pin_21 := TGpioLinuxPin.Create(21);  pin_21.Direction := gdIn; 
pin_21.InterruptMode := [gimRising, gimFalling];  try    repeat     
if input.WaitForInterrupt(TGpioLinuxPin.INTERRUPT_WAIT_INFINITE,
NewValue) then        Writeln('Interrupt on Pin ', input.PinID, ' with
value ', NewValue)      else        WriteLn('Timeout');    until
False;  except    // e.g. on sig int    pin_21.Destroy;  end;end.
    Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
wiringPiSetupGpio;  
wiringPiISR(19,INT_EDGE_FALLING,@WVW_TEST_PROCEDURE);
Hey freepascal Crew, does anybody have short example code to interrupt
your GPIOPIN on fpc for raspberry ?

On PascalIO it works, but it only needs to wait for a pinchange, wich
is not preferred to unfold incoming signals from my distance sensor
HC-SR04

On wiringPI it works, but i can not have a falling and rising in one
procedure and it also does not have code for previous pin status.

Does anybody know a other component pack?

Some native FPC code wil maybe also do.

Thank you and Greets, Wouter van Wegen.

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MarkMLl · 2022-03-18 13:57

Are those true interrupts, i.e. handled via the Linux kernel, or
simply pins which are periodically polled?

MarkMLl

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Thaddy · 2022-03-18 14:18

Quote from: MarkMLl on March 18, 2022, 02:57:42 pmAre those true
interrupts, i.e. handled via the Linux kernel, or simply pins which
are periodically polled?

MarkMLl
They are true interrupts in both cases. I may have an example for the
second one. Have to look it up, though.l

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MarkMLl · 2022-03-18 14:30

Quote from: Thaddy on March 18, 2022, 03:18:13 pmThey are true
interrupts in both cases. I may have an example for the second one.
Have to look it up, though.l

I'm being cautious. Some I2C/SPI-connected GPIO stuff that I've been
looking explains that its interrupts are handled by polling at the
driver level, even if they're exposed by the gpiod etc. API as
apparent interrupts.

MarkMLl