Hello,
I have a question about the behaviour of the halui bit pins and would
like to confirm that I understand the code correctly. I could not answer
my question from the halui documentation.
Do these pins activate on both a rising and a falling edge ?
It like to use the input pin halui.program.pause to pause a running
program if I get a signal that might indicate that the material sheet
*might* have moved and the operator needs to check.
Having a cursory look at the linuxcnc source code I suspect the halui
pins come from linuxcnc-dev/src/emc/usr_intf/halui.cc
And in halui.cc these line (with lines numbers):
1114 static int sendProgramPause()
1115 {
1116 EMC_TASK_PLAN_PAUSE emc_task_plan_pause_msg;
1117
1118 return emcCommandSend(emc_task_plan_pause_msg);
...
1544 static int check_bit_changed(bool halpin, bool &newpin)
1545 {
1546 if (halpin != newpin) {
1547 newpin = halpin;
1548 return halpin;
1549 }
1550 return 0;
1551 }
...
1654 if (check_bit_changed(new_halui_data.program_pause,
old_halui_data.program_pause) != 0)
1655 sendProgramPause();
That line 1654 looks to me as if both edges would trigger the msg
emc_task_plan_pause_msg to be send.
Is that correct ?
Thank you
BR
Max.
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