Support for Watch Dog Timer ?
Hi All,
First of all, thanks for providing SimulIDE . Its very useful and awesome simulator!
I am using it for a circuit that uses PIC16F72 (Though this uC is not supported, I was able to use p16F873-2). I am stuck at simulating Sleep and wakeup by Watch Dog Timer (WDT) on any PIC in SimulIDE.
Note : On the physical uC PIC16F72 WDT is working fine.
I have written small program (Attached) to try WDT with p16F627-10 (As it has Enable WD in its Properties->config) But as soon as I start the simulation, following message is show repeatedly in the console and nothing works.
McuWdt::runEvent - Watchdog Reset
But the same program is working as expected in MPLAB X IDE 6.25's Simulator.
Any suggestion would be highly appreciated.
Thanks in Advance.
-Guru
Uploaded files:
Hi, thanks for reporting.
Can you share the hex file to test it?
Hi @arcachofo,
Thanks for the reply. Please find the attached hex file for the same.
Regards,
-Guru
Uploaded files:Thank you.
Fixed and re-uploaded files at rev 2061:
https://simulide.com/p/testers/
Hi @arcachofo,
Wow, that was pretty quick. Thank you so much. Working absolutely fine. Apologies if I am calling with a wrong name.
I need a suggestion. Since 16F72 was missing I used 16F873 for my simulation. But 16F873 is missing Watch Dog Timer in Config window. Hence just for simulating WDT I am using PIC16F627 as it has Enable WDT in config window as shown in the attached image. Is there a way to enable WDT for 16F873? Please suggest.
Thanks and Regards,
Guru
Uploaded files:Quote from Gururaj on April 18, 2025, 4:35 pmHi @arcachofo,
Wow, that was pretty quick. Thank you so much. Working absolutely fine. Apologies if I am calling with a wrong name.
I need a suggestion. Since 16F72 was missing I used 16F873 for my simulation. But 16F873 is missing Watch Dog Timer in Config window. Hence just for simulating WDT I am using PIC16F627 as it has Enable WDT in config window as shown in the attached image. Is there a way to enable WDT for 16F873? Please suggest.
You can fix 16F873 Watchdog.
Open file in Editor: data/PIC/p16F87x/p16F87x_perif.xml
And add these lines before configwords and save:
<wdt name="WDT" configregsA="OPTION"
prescalers="1,2,4,8,16,32,64,128"/>The end of the file should look like this:
<spi name="SPI" configregsA="SSPCON"
dataregs="SSPBUF"
statusreg="SSPSTAT"
interrupt="SSP"
prescalers="4,16,64,0"
pins="PORTC5,PORTC4,PORTC3,PORTA5"/><!-- "SD0,SDI,SCK,SS" -->
</msspunit>
<wdt name="WDT" configregsA="OPTION"
prescalers="1,2,4,8,16,32,64,128"/>
<configwords name="cfgWord" type="02">
<word name="COINFIG1" address="0x2007" value="0xFF" />
<word name="COINFIG2" address="0x2008" value="0xFF" />
</configwords>
</parts>
Thanks for the suggestion. That got me the WDT for 16F873.
But CLRWDT() or __asm("clrwdt") is not honored and as per the configuration every 2.3 seconds 16F873 is getting reset (
McuWdt::runEvent - Watchdog Reset) even if CLRWDT() or __asm("clrwdt") is called within 100 msecs.
Its not the issue with only 16F873. But even in PIC16F627 same issue is happening. I have attached a Blink.c, Blink.Hex and Blink.sim1 files for your reference. If CLRWDT() or __asm("clrwdt") is honored, LED should blink 5 times with a delay of 500 msec. Almost at 1.5 Secs, uC is reset with WDT. Can CLRWDT() be considered in any way? Please suggest.
Thanks and Regards,
Gururaj
Uploaded files:
But CLRWDT() or __asm("clrwdt") is not honored and as per the configuration every 2.3 seconds 16F873 is getting reset (
Yes, it would be good that we could clear the watchdog...
I think it is solved, but I'm not going to build for all OS.
Here you have Windows 64 version to test it: SimulIDE_1.1.0-16F72.zip
BTW: I added PIC16F72, but I didn't test it at all, feel free to give it a try.
Its working absolutely fine now. I used Pic16F72 and working as expected along with WDT. Thank you so much.
Regards,
Gururaj