DT Instant Interrupts

[krohtech]

I have SPWM_INT working really well. I am doing 16 ch of PWM on a pic 18F2410 32 MHz. The pwm is running at 100Hz 8 bit resolution.

SPWM_INT uses Timer1, so if you also want a Blinky light, you'll need to use a different Timer. (0, 2 or 3)
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Here is where I am having trouble. I tried to add a blinky from the DT_INTS-18 example and change it to timer0 with no success. Darrel, can you point me in the correct direction?

[krohtech]

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

'-----------------------------SPWM INT-----------------------------
CLEAR

INCLUDE "DT_INTS-18.bas"            ; Base Interrupt System
INCLUDE "SPWM_INT.bas"              ; Software PWM module
INCLUDE "ReEnterPBP-18.bas"    ; Include if using PBP interrupts

LED2 VAR PORTA.5

DEFINE SPWM_FREQ  100                ; SPWM Frequency
DEFINE SPWM_RES   101               ; SPWM Resolution

DutyVars   VAR BYTE[16]              ; DutyCycle Variables
  DutyVar1 VAR DutyVars[0]          ; group them in an array for easy access
  DutyVar2 VAR DutyVars[1]          ; with FOR loops etc.
  DutyVar3 VAR DutyVars[2]
  DutyVar4 VAR DutyVars[3]
  DutyVar5 VAR DutyVars[4]
  DutyVar6 VAR DutyVars[5]
  DutyVar7 VAR DutyVars[6]
  DutyVar8 VAR DutyVars[7]
  DutyVar9 VAR DutyVars[8]          
  DutyVar10 VAR DutyVars[9]         
  DutyVar11 VAR DutyVars[10]
  DutyVar12 VAR DutyVars[11]
  DutyVar13 VAR DutyVars[12]
  DutyVar14 VAR DutyVars[13]
  DutyVar15 VAR DutyVars[14]
  DutyVar16 VAR DutyVars[15]
  
ASM
SPWM_LIST  macro                    ; Define Pin's to use for SPWM
     SPWM_PIN  PORTB, 0, _DutyVar1  ; and the associated DutyCycle variables
     SPWM_PIN  PORTB, 1, _DutyVar2  ; Notice the underscore before variables
     SPWM_PIN  PORTB, 2, _DutyVar3
     SPWM_PIN  PORTB, 3, _DutyVar4
     SPWM_PIN  PORTB, 4, _DutyVar5
     SPWM_PIN  PORTB, 5, _DutyVar6
     SPWM_PIN  PORTB, 6, _DutyVar7
     SPWM_PIN  PORTB, 7, _DutyVar8
     SPWM_PIN  PORTC, 0, _DutyVar9 
     SPWM_PIN  PORTC, 1, _DutyVar10 
     SPWM_PIN  PORTC, 2, _DutyVar11
     SPWM_PIN  PORTC, 3, _DutyVar12
     SPWM_PIN  PORTC, 4, _DutyVar13
     SPWM_PIN  PORTC, 5, _DutyVar14
     SPWM_PIN  PORTC, 6, _DutyVar15
     SPWM_PIN  PORTC, 7, _DutyVar16 
     endm
  SPWM_INIT  SPWM_LIST              ; Initialize the Pins
ENDASM

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler   TMR1_INT,  SPWMhandler,  ASM,  yes
        INT_Handler   TMR0_INT,  _ToggleLED2,  PBP,  yes

    endm
    INT_CREATE                      ; Creates the interrupt processor
ENDASM

T0CON = %10010010             ; T0 = 16-bit, Prescaler 8
@ INT_ENABLE  TMR1_INT        ; enable Timer 1 interrupts
@ INT_ENABLE  TMR0_INT        ; enable Timer 0 interrupts


'-----------------------------Main Program-----------------------------
Main:

[Darrel Taylor]

I think the Cut&Paste didn't catch everything.

Can you post the Main: and Handler parts?
Thanks.

[Darrel Taylor]

OH!, nevermind!

ADCON1 = $0F

[krohtech]

Thanks Darrel,

That worked, I think I need to learn that register, TIME TO HIT THE DATA SHEET...

[Darrel Taylor]

That's a good one to learn.
You'll need some variation of it in almost every program you write.

Also, Since the TMR0_INT handler is only toggling a pin, it's not using any PBP system variables.

You can change the TMR0_INT's "Type" to ASM.
Then it won't be saving all the system variables when it doesn't need to. Time is critical with that many simultaneous PWM's.

Then you can remove the ReEnterPBP-18.bas include file, which will save some RAM and Code space.

[krohtech]

Thanks again Darrel,

I just fully tested the SPWM_INT running 16 channels @ 100Hz 0-100 resolution. I tested each channel with a 7 amp led cluster (Agilight Brightstrip see below) of typical sign led strips powered through a MOSFET. This worked great. I am able to dim all the way down to 1% without any flicker and smoothly fade up to 100% with no flicker or noticeable stair stepping effect. This is smoother than when I used the older multi SPWM program.

I really appreciate you help

http://www.agilight.com/brightstrip/index.htm

[Ioannis]

...
You can change the TMR0_INT's "Type" to ASM.
Then it won't be saving all the system variables when it doesn't need to. Time is critical with that many simultaneous PWM's.

Then you can remove the ReEnterPBP-18.bas include file, which will save some RAM and Code space.

I may missed that little but critical details. Are these described somewhere Darrel?

And may be others too that I am not aware off...

Thanks,
Ioannis