Timer1 problems on 16lf18326

[David Stephenson]

Finally got the HI2C working on this chip (I think it was a #config problem). Now I am having trouble getting the timer1 module to cause an interrupt on overflow (during sleep).
This is what I have (it works fine on a 16F1705 - which as far as I can see has the same registers associated with timer1 and interrupts)

#chip 16LF18326,4
#config RSTOSC=hfint1, MCLRE=Off, WDTE=off, boren=off

dir porta.4 in 'timer1
dir porta.5 in 'timer1
TMR1H=b'1000000'
TMR1L=b'0000000'
pir1.0=0
t1con=b'10001101' 'timer1 1:1
intcon.7=1
pie1.0=1
t1gcon.7=0
do
'********program here
sleep
nop
pir1.0=0
loop

[Anobium]

Look in your install for this demo. 15 Rotate the LEDs using the Timer Overflow Event.gcb This is in the Vendor Demos\GCB Board folders.

But, you have not set T1GPPS = 0x04. Is this required?

And, are you saying when you select 4mhz the incorrect oscillator is selected?

[David Stephenson]

I have a clock crystal (32kHz) on the socsi/sosco pins as a secondary oscillator to provide interrupts every second (accurately). I am using the internal oscillator at 4MHz as the cpu oscillator.
As far as I can see the secondary oscillator pins cannot be reconfigured by the PPS (the T1GPPS is a gate for the oscillator which I have disabled).

I cannot find the vendor demos\GCB board folders.

[Anobium]

I did not show the complete folder structure - it was more of a pointer for you. :-)

..\GCB@Syn\GreatCowBasic\Demos\Vendor Boards\Great Cow Basic Demo Board\16f18326 ChipRange Demonstrations

[David Stephenson]

So I am currently in https://sourceforge.net/p/gcbasic/discussion/ how do I find that directory?

[Anobium]

This is in your local computer installation. You have 500+ demos installed.

[Anobium]

Try this. I am wonder if we are setting, in the lowlevel code, something that you are also setting.

#chip 16LF18326,4
#config RSTOSC=hfint1, MCLRE=Off, WDTE=off, boren=off
#option Explicit

dir porta.4 in 'timer1
dir porta.5 in 'timer1
SetTimer 1, 0x4000


StartTimer 1
TMR1CS1=1
TMR1CS1=0
T1SOSC = 1
T1SYNC = 1


TMR1IF = 0
TMR1IE =1
IntOn

  do
  '********program here
    sleep
    nop
    TMR1IF = 0
  loop

[David Stephenson]

Well I'm glad I've finally found the demos!
No those alterations still do not work. I'm pretty sure everything is correct and it works on a 16F1705 which has very similar settings for the T1 oscillator.
I'm beginning to wonder if the oscillator module in this chip is a bit more fussy and the clock crystal is not oscillating - I will investigate.

[David Stephenson]

No it is not even oscillating. With a 16F1705 in its place I see the 32kHz oscillations on pin RA5.

[Anobium]

Study these...these are the demo configs.

#Config WRT_OFF, CPD_ON, MCLRE_ON, FEXTOSC_OFF, CLKOUTEN_OFF 'These configs = User non-votatile protection off (WRT), Data non-votatile protection off (CPD), MCLR pin function enablesd, External oscillator not enabled and clockout function is disables ( enable portc.5 to I/O port).

So, FEXTOSC_OFF, CLKOUTEN_OFF is the key.

[David Stephenson]

Thanks again. That has done the trick. These newer types certainly have challenging #config settings.
I guess I also need WRT_OFF to write to memory.

[Anobium]

Don't be guessing..... LOL!!!