Performing a loop every 10ms

[ria_river]

Can you display your code so that I will have an idea on what's going on.

[Acetronics2]

Hi, Wassup

As Timer 0 is a 8 bits timer ... and we suppose clock is 4Mhz ( ... )

I will be necessary to have a counting loop in the interrupt stub , because interrupts will occur every 256 µs as a maximum

The other solution is to use Timer 1 that has a 16 bits counting range ... and won't need any calculations.

Have a SEARCH for "PicMultiCalc" from Mr E. it's a nice tool to help for Timer designs ...

Alain

[sayzer]

...256 µs as a maximum

??

Minimum?

Maximum?

I must be on the other side of the mirror.

[Acetronics2]

??

Minimum?

Maximum?

I must be on the other side of the mirror.

The other side of the Bosphor, certainly !!!

1x 1µs = 1µs ... 256x 1µs = 256µs ...

so, the maximum period is 256 µs ...

what was requested for, is a period duration of 10 ms ... or a 10,000 timer count !

Tell me if I'm wrong !!!

Alain

[sayzer]

The other side of the Bosphor, certainly !!!

Alain

Depends on what side you are standing at.

1x 1µs = 1µs ... 256x 1µs = 256µs ...

so, the maximum period is 256 µs ...

what was requested for, is a period duration of 10 ms ... or a 10,000 timer count !

Tell me if I'm wrong !!!

Alain

The "maximum" means fastest then.

Also, what do we get from TMR0 at 4Mhz at 1:4 prescaler ?
I get roughly 1.03ms.

I may be doing a wrong math here.

[wasssup1990]

Wow, thankyou for all of your replies.

I forgot to mention that my crystal is 20MHz and both CCP1 and CCP2 are being used for HPWM.

I found PicMultiCalc and it is saying that I can use the 8-bit timer (Timer0) for an error of 0.371%. It says that if I use the 16-bit timer I will get an error of 0%. Now I have decided that I will use the 16-bit timer only if it won't interupt my HPWM. The HPWM is driving two motors. I am not at all familure with these timers and I don't know how to set them up or know when to start my 10ms loop so that the gyro can be read at the start of every loop at 100Hz (10ms intervals). Integration calculations and other processes are carried out after the gyro has been read. If all calculations and procesess have been done before the next loop should start, the processor should wait until the timer flag or whatever signals the loop to start over.

FYI I am making a balancing robot.

[skimask]

Wow, thankyou for all of your replies.

Said it before, I'll say it again...
Start simple...
Get the LED blinking at a known rate under an interrupt drive (or just get an LED blinking ), get the HPWM working on all channels in all situations, get the interfaces working, THEN tie them all together.
Otherwise you'll be shooting yourself in the foot wondering why...no more...just wondering WHY!!!!

[Acetronics2]

FYI I am making a balancing robot.

You should browse the parallax site ...

They already did it ( and they share it !!! ) ... and moreover their basic is PbP compatible !!!

... at least TONS of understandable solutions to your headaches ...

Alain