Problem opening UART, when autostarting UBUNTU with lazarus
application
lazarus / 32-Linux

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pascalbythree · 2026-03-23 11:28

Lazarus people,

When configuring autostart,

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 [Desktop En
try]Type=ApplicationExec=/home/pascalbythree/WVW_ENDCODE_V2/project1Hi
dden=falseNoDisplay=falseX-GNOME-Autostart-enabled=trueName=My
Application
My own made lazarus application gives this error as seen in
screenshot.
When connecting to /dev/ttyAMA0, the onboard 3.3V UART of my raspberry
5
PS: I am booting UBUNTU 26 and lazarus 4.99 FPC 3.3.1

When i boot to the GUI and execute the project1 executable by hand, it
fully works fine.

Anybody knows what to do to fix this? Greets, Wouter van Wegen,
pascalbythree

The project i am currently working on is a equalizer on my Samsung TV,
with has serial port input make graphical.

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ccrause · 2026-03-23 17:21

Quote from: pascalbythree on March 23, 2026, 12:28:02 pmWhen i boot to
the GUI and execute the project1 executable by hand, it fully works
fine.

Could be a permission problem associated with the user context.  Trap
the exception and call SysUtils.GetLastOSError to retrieve the OS
error.  This could help to identify the cause (but depends on the
internal design of the serial component you are using).  You can also
check under which user ID your program is running by calling
BaseUnix.FpGetuid.