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simple Interrupt for PROstart
Posted: Wed Oct 26, 2022 12:42 pm
by ctkilian
I could really use a sample program (using BASIC) of using an external interrupt on a PRO start board. Ultimately I would like to have 2 interrupting devices.
Thank you, Chris
Re: simple Interrupt for PROstart
Posted: Wed Oct 26, 2022 7:44 pm
by basicchip
I will add this to the next release.
This uses the BOOT pin (GPIO0.1) which can be toggled by BASICtools. (I should change the label from EINT0 to GPIO0.1)
Source for
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Re: simple Interrupt for PROstart
Posted: Fri Oct 28, 2022 7:01 pm
by basicchip
Updated the file to change the label to GPIO0.1 for LPC1114
Also program correctly for rising edge interrupt (default was falling edge).
Re: simple Interrupt for PROstart
Posted: Sun Oct 30, 2022 1:47 am
by ctkilian
Thanks, the example works, but I can't figure out how to modify the example for an external interrupt coming in on, say, P0.3.
Chris
Re: simple Interrupt for PROstart
Posted: Sun Oct 30, 2022 10:56 am
by basicchip
The details of these interrupts are in the NXP user manual.
To change to GPIO0.3 --
Code: Select all
INTERRUPT SUB INT_GPIO0
GPIO0_IC = (1 << 3) ' clear interrupt on pin 3
and
Code: Select all
SUB ON_GPIO0(rise_edge, dothis)
' Setup MUST be done before enabling the interrupt
GPIO0_IE = (1 << 3) ' interrupt on GPIO0.3
if rise_edge then GPIO0_IEV = (1 << 3)
And if you need multiple pins on GPIO0, add those bits to the above, and then test for which one in GPIO0_MIS and clearing just that one in the interrupt routine
Re: simple Interrupt for PROstart
Posted: Wed Nov 02, 2022 12:17 am
by ctkilian
Thanks again, I got it to work on P0.3, although I had to "comment out" 2 lines that I thought you said should be there (see below). Chris
'LPC1114Int_tst3 this test routine demonstrates using an external interrupt on P0.3
#if defined(LPC1114)
#define INT_STR "GPIO0.1"
#endif
dim e0 as integer
dim s0 as integer
dim rx as integer
INTERRUPT SUB INT_GPIO0_1
GPIO0_IC = (1<<3) ' clear interrupt
e0 = e0 + 1
ENDSUB
SUB ON_GPIO0_1(rise_edge, dothis)
' Setup MUST be done before enabling the interrupt
GPIO0_IE = (1<<3) ' interrupt on GPIO0.3
'GPIO0.3
'if rise_edge then GPIO0_EV = (1<<3)
GPIO0_ISR = dothis or 1 'set function of NVIC
VICIntEnable = VICIntEnable or (1<<31) '&H80000000 'Enable interrupt Vector 31 -GPIO0
ENDSUB
Re: simple Interrupt for PROstart
Posted: Tue Nov 08, 2022 12:49 am
by ctkilian
on further examination it turns out that the line
if rise_edge then GPIO0_IEV = (1<<3)
must be included to make the interrupt happen on the rising edge (otherwise it happens on the falling edge)
Chris