DT Instant Interrupts

[Archangel]

Hi Darrel,
could you please explain DutyVars(LoopCount) = 50 ; 50% (0-100), I understand the counter loop but do not understand the operation here. Thank You
JS

Anybody ???

[skimask]

Anybody ???

Nothing more than an index'd variable.

DutyVars(LoopCount) = 50

(not code below...)
If loopcount = 1 then the following two lines are equivalent

-DutyVars(1) = 50

-loopcount = 1 : DutyVars(loopcount) = 50

At least I think that's what you were asking about.
If that's what you were asking, the book explanation is in Chapter 4.5 of the manual...if not...whoops! My bad

[Archangel]

OK, so dutyvars is an array holding the changing value loopcount and that = 50 ? This really is Fuzzy . . .

 label VAR size[number of elements]
label = DutyVar
size = Loopcount
what does = 50 do exactly?
Does it give you a 16 byte array all having the value of 50?

[krohtech]

what does = 50 do exactly?
Does it give you a 16 byte array all having the value of 50?

Hi Joe,

50 would be the duty cycle of the PWM. In this example the SPWM_INT duty cycle was setup to be 0 - 100 so 50 would be roughly 50% at 100 Hz. See Below

DEFINE SPWM_FREQ 100 ; SPWM Frequency = 100 Hz
DEFINE SPWM_RES 101 ; SPWM Resolution = 0-100

[Archangel]

Hi Joe,

50 would be the duty cycle of the PWM. In this example the SPWM_INT duty cycle was setup to be 0 - 100 so 50 would be roughly 50% at 100 Hz. See Below

Hi Kurt,
I understood what the 50 stands for, but not what the array does or how it does it, does it set all PWM outputs to 50 % ? I am thinking that is what it does.
Thanks
JS

[krohtech]

Hi Kurt,
I understood what the 50 stands for, but not what the array does or how it does it, does it set all PWM outputs to 50 % ? I am thinking that is what it does.
Thanks
JS

Hi Joe,

Yse in this example it does set all 16 channels to 50.

[boroko]

Hi Kurt, (and all)

In post #10, you mentioned that you used a different PWM resolution of 101 instead of 100. Can you expand on that a bit? I'm working on something similar and would like to understand why that helps.


"here is my current code, changed to 101 PWM resolution to reduce overhead"

Thanks
Mark