PICBasic newbie problem

[ELCouz]

Dear members,

FOA,I'm not new to the PIC World, I'm using CCS C compiler regularly

Recently I started using PICBasic Pro because i knew basic is easy to use when it come create very simple project... you know leds stuff!

However after reading that @ __config is depreciated for PIC18
I'm trying to use CONFIG instead but how ?

CONFIG FOSC = HS,LVP = OFF,BOR = OFF,MCLRE = OFF

led VAR PORTB.5
steps VAR WORD
cycles CON 2

' Change limits for steps to play around 0 or 100% brightness
' Change steps for different duration of ramps
' Works good even with high brightness LEDs, harder to control linearly


fade:

up:
For steps=0 TO 255
PWM led,steps,cycles
Next
High led

Pause 2500

down:
For steps=255 TO 1 STEP -1
PWM led,steps,cycles
Next
Low led

Pause 2500


GoTo fade

End

Microcode studio says ERROR syntax at the first line! why ?

Yes i did read the other post, including the faq about headers but like i said __CONFIG dont work anymore with MPASM

Best Regards,

Laurent

EDIT: oh btw , pic18f4550 with 12mhz hs xtal

[Archangel]

http://ww1.microchip.com/downloads/e...Doc/39632b.pdf
check out OSCCON and OSCTUNE see section 2.2.2, 2.2.5.2, aw heck, read all of section 2.

[ELCouz]

Yes, i have a printed pdf of this pic on my wall :P

I did read them before , the problem is ... how to write (declare) them in PICBasic this is my first attempt at picbasic , so don't bash me :P ?

IMPORTANT: For the PIC18 devices, the __CONFIG directive has been
; superseded by the CONFIG directive. The following settings
; are available for this device.
;
; PLL Prescaler Selection bits:
; PLLDIV = 1 No prescale (4 MHz oscillator input drives PLL directly)
; PLLDIV = 2 Divide by 2 (8 MHz oscillator input)
; PLLDIV = 3 Divide by 3 (12 MHz oscillator input)
; PLLDIV = 4 Divide by 4 (16 MHz oscillator input)
; PLLDIV = 5 Divide by 5 (20 MHz oscillator input)
; PLLDIV = 6 Divide by 6 (24 MHz oscillator input)
; PLLDIV = 10 Divide by 10 (40 MHz oscillator input)
; PLLDIV = 12 Divide by 12 (48 MHz oscillator input)
;
; CPU System Clock Postscaler:
; CPUDIV = OSC1_PLL2 [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]
; CPUDIV = OSC2_PLL3 [OSC1/OSC2 Src: /2][96 MHz PLL Src: /3]
; CPUDIV = OSC3_PLL4 [OSC1/OSC2 Src: /3][96 MHz PLL Src: /4]
; CPUDIV = OSC4_PLL6 [OSC1/OSC2 Src: /4][96 MHz PLL Src: /6]
;
; USB Clock Selection bit (used in Full Speed USB mode only; UCFG:FSEN = 1):
; USBDIV = 1 USB clock source comes directly from the primary oscillator block with no postscale
; USBDIV = 2 USB clock source comes from the 96 MHz PLL divided by 2
;
; Oscillator Selection bits:
; FOSC = XT_XT XT oscillator, XT used by USB
; FOSC = XTPLL_XT XT oscillator, PLL enabled, XT used by USB
; FOSC = ECIO_EC External clock, port function on RA6, EC used by USB
; FOSC = EC_EC External clock, CLKOUT on RA6, EC used by USB
; FOSC = ECPLLIO_EC External clock, PLL enabled, port function on RA6, EC used by USB
; FOSC = ECPLL_EC External clock, PLL enabled, CLKOUT on RA6, EC used by USB
; FOSC = INTOSCIO_EC Internal oscillator, port function on RA6, EC used by USB
; FOSC = INTOSC_EC Internal oscillator, CLKOUT on RA6, EC used by USB
; FOSC = INTOSC_XT Internal oscillator, XT used by USB
; FOSC = INTOSC_HS Internal oscillator, HS used by USB
; FOSC = HS HS oscillator, HS used by USB
; FOSC = HSPLL_HS HS oscillator, PLL enabled, HS used by USB
;
; Fail-Safe Clock Monitor Enable bit:
; FCMEN = OFF Fail-Safe Clock Monitor disabled
; FCMEN = ON Fail-Safe Clock Monitor enabled
;
; Internal/External Oscillator Switchover bit:
; IESO = OFF Oscillator Switchover mode disabled
; IESO = ON Oscillator Switchover mode enabled
;
; Power-up Timer Enable bit:
; PWRT = ON PWRT enabled
; PWRT = OFF PWRT disabled
;
; Brown-out Reset Enable bits:
; BOR = OFF Brown-out Reset disabled in hardware and software
; BOR = SOFT Brown-out Reset enabled and controlled by software (SBOREN is enabled)
; BOR = ON_ACTIVE Brown-out Reset enabled in hardware only and disabled in Sleep mode (SBOREN is disabled)
; BOR = ON Brown-out Reset enabled in hardware only (SBOREN is disabled)
;
; Brown-out Voltage bits:
; BORV = 0 Maximum setting
; BORV = 1
; BORV = 2
; BORV = 3 Minimum setting
;
; USB Voltage Regulator Enable bit:
; VREGEN = OFF USB voltage regulator disabled
; VREGEN = ON USB voltage regulator enabled
;
; Watchdog Timer Enable bit:
; WDT = OFF HW Disabled - SW Controlled
; WDT = ON HW Enabled - SW Disabled
;
; Watchdog Timer Postscale Select bits:
; WDTPS = 1 1:1
; WDTPS = 2 1:2
; WDTPS = 4 1:4
; WDTPS = 8 1:8
; WDTPS = 16 1:16
; WDTPS = 32 1:32
; WDTPS = 64 1:64
; WDTPS = 128 1:128
; WDTPS = 256 1:256
; WDTPS = 512 1:512
; WDTPS = 1024 1:1024
; WDTPS = 2048 1:2048
; WDTPS = 4096 1:4096
; WDTPS = 8192 1:8192
; WDTPS = 16384 1:16384
; WDTPS = 32768 1:32768
;
; MCLR Pin Enable bit:
; MCLRE = OFF RE3 input pin enabled; MCLR disabled
; MCLRE = ON MCLR pin enabled; RE3 input pin disabled
;
; Low-Power Timer 1 Oscillator Enable bit:
; LPT1OSC = OFF Timer1 configured for higher power operation
; LPT1OSC = ON Timer1 configured for low-power operation
;
; PORTB A/D Enable bit:
; PBADEN = OFF PORTB<4:0> pins are configured as digital I/O on Reset
; PBADEN = ON PORTB<4:0> pins are configured as analog input channels on Reset
;
; CCP2 MUX bit:
; CCP2MX = OFF CCP2 input/output is multiplexed with RB3
; CCP2MX = ON CCP2 input/output is multiplexed with RC1
;
; Stack Full/Underflow Reset Enable bit:
; STVREN = OFF Stack full/underflow will not cause Reset
; STVREN = ON Stack full/underflow will cause Reset
;
; Single-Supply ICSP Enable bit:
; LVP = OFF Single-Supply ICSP disabled
; LVP = ON Single-Supply ICSP enabled
;
; Dedicated In-Circuit Debug/Programming Port (ICPORT) Enable bit:
; ICPRT = OFF ICPORT disabled
; ICPRT = ON ICPORT enabled
;
; Extended Instruction Set Enable bit:
; XINST = OFF Instruction set extension and Indexed Addressing mode disabled (Legacy mode)
; XINST = ON Instruction set extension and Indexed Addressing mode enabled
;
; Background Debugger Enable bit:
; DEBUG = ON Background debugger enabled, RB6 and RB7 are dedicated to In-Circuit Debug
; DEBUG = OFF Background debugger disabled, RB6 and RB7 configured as general purpose I/O pins
;
; Code Protection bit Block 0:
; CP0 = ON Block 0 (000800-001FFFh) code-protected
; CP0 = OFF Block 0 (000800-001FFFh) not code-protected
;
; Code Protection bit Block 1:
; CP1 = ON Block 1 (002000-003FFFh) code-protected
; CP1 = OFF Block 1 (002000-003FFFh) not code-protected
;
; Code Protection bit Block 2:
; CP2 = ON Block 2 (004000-005FFFh) code-protected
; CP2 = OFF Block 2 (004000-005FFFh) not code-protected
;
; Code Protection bit Block 3:
; CP3 = ON Block 3 (006000-007FFFh) code-protected
; CP3 = OFF Block 3 (006000-007FFFh) not code-protected
;
; Boot Block Code Protection bit:
; CPB = ON Boot block (000000-0007FFh) code-protected
; CPB = OFF Boot block (000000-0007FFh) not code-protected
;
; Data EEPROM Code Protection bit:
; CPD = ON Data EEPROM code-protected
; CPD = OFF Data EEPROM not code-protected
;
; Write Protection bit Block 0:
; WRT0 = ON Block 0 (000800-001FFFh) write-protected
; WRT0 = OFF Block 0 (000800-001FFFh) not write-protected
;
; Write Protection bit Block 1:
; WRT1 = ON Block 1 (002000-003FFFh) write-protected
; WRT1 = OFF Block 1 (002000-003FFFh) not write-protected
;
; Write Protection bit Block 2:
; WRT2 = ON Block 2 (004000-005FFFh) write-protected
; WRT2 = OFF Block 2 (004000-005FFFh) not write-protected
;
; Write Protection bit Block 3:
; WRT3 = ON Block 3 (006000-007FFFh) write-protected
; WRT3 = OFF Block 3 (006000-007FFFh) not write-protected
;
; Boot Block Write Protection bit:
; WRTB = ON Boot block (000000-0007FFh) write-protected
; WRTB = OFF Boot block (000000-0007FFh) not write-protected
;
; Configuration Register Write Protection bit:
; WRTC = ON Configuration registers (300000-3000FFh) write-protected
; WRTC = OFF Configuration registers (300000-3000FFh) not write-protected
;
; Data EEPROM Write Protection bit:
; WRTD = ON Data EEPROM write-protected
; WRTD = OFF Data EEPROM not write-protected
;
; Table Read Protection bit Block 0:
; EBTR0 = ON Block 0 (000800-001FFFh) protected from table reads executed in other blocks
; EBTR0 = OFF Block 0 (000800-001FFFh) not protected from table reads executed in other blocks
;
; Table Read Protection bit Block 1:
; EBTR1 = ON Block 1 (002000-003FFFh) protected from table reads executed in other blocks
; EBTR1 = OFF Block 1 (002000-003FFFh) not protected from table reads executed in other blocks
;
; Table Read Protection bit Block 2:
; EBTR2 = ON Block 2 (004000-005FFFh) protected from table reads executed in other blocks
; EBTR2 = OFF Block 2 (004000-005FFFh) not protected from table reads executed in other blocks
;
; Table Read Protection bit Block 3:
; EBTR3 = ON Block 3 (006000-007FFFh) protected from table reads executed in other blocks
; EBTR3 = OFF Block 3 (006000-007FFFh) not protected from table reads executed in other blocks
;
; Boot Block Table Read Protection:
; EBTRB = ON Boot block (000000-0007FFh) protected from table reads executed in other blocks
; EBTRB = OFF Boot block (000000-0007FFh) not protected from table reads executed in other blocks
;

It would be nice if i could write them (ex: FOSC = HS written in P18F4550.inc of MPASM ) instead of defining them with HEX stuff
Have a nice day!

Best Regards,
Laurent

[Pic_User]

Hi Laurent,

Welcome to the forum.
See if this previous series of posts from Melanie, mister_e and others, helps.
http://www.picbasic.co.uk/forum/showthread.php?p=14264

-Adam-

[ELCouz]

Thanks I've commented the Picbasic fuses in the include...

Fuses is ok but on compiling this code:

ASM
    CONFIG FOSC=HS    ; Use HS oscillator (20MHZ here)
    CONFIG BOR=OFF    ; Brown out reset ON  
    CONFIG WDT=ON    ; Watch dog timer ON
    CONFIG LVP=OFF   ; Low Voltage programming OFF
    CONFIG DEBUG=OFF ; Background debugger OFF
    ENDASM
led VAR PORTB.5
steps VAR WORD
cycles CON 2

' Change limits for steps to play around 0 or 100% brightness
' Change steps for different duration of ramps
' Works good even with high brightness LEDs, harder to control linearly


fade:

up:
For steps=0 TO 255
PWM led,steps,cycles
Next
High led

Pause 2500

down:
For steps=255 TO 1 STEP -1
PWM led,steps,cycles
Next
Low led

Pause 2500


GoTo fade

End

i receive many errors :


maybe it's the code that is faulty or it's something else ?

Could you show me a code that will ABSOLUTELY compile (and tested to work), ex: blink a led so i can start to debug the previous code , to see if its my compile that freaks out or it just a simple issue....


Many thanks!

Have a nice week!

Best Regards,

Laurent

[krohtech]

I just went through the same problems. See the thread below post#6 regarding editing the .inc file


http://www.picbasic.co.uk/forum/show...ighlight=fuses

[krohtech]

ASM
    CONFIG FOSC=HS    ; Use HS oscillator (20MHZ here)
    CONFIG BOR=OFF    ; Brown out reset ON  
    CONFIG WDT=ON    ; Watch dog timer ON
    CONFIG LVP=OFF   ; Low Voltage programming OFF
    CONFIG DEBUG=OFF ; Background debugger OFF
    ENDASM

I never did get this method to work. I use this method of setting the fuses on my 18F2410:

@       __CONFIG    _CONFIG1H, _OSC_INTIO67_1H
@       __CONFIG    _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H
@       __CONFIG    _CONFIG3H, _MCLRE_OFF_3H & _PBADEN_OFF_3H 
@       __CONFIG    _CONFIG4L, _LVP_OFF_4L & _XINST_OFF_4L

[Bruce]

Refer to post #20 in the above thread link. PBP still does not support the new style config directive without the double underscore.

You need to do it the old fashioned way as indicated in the above post by krohtech.

[ELCouz]

Thanks ! You fix all my problems !

However i have another question about this code and the function PWM...

How to have multiple pwms output ?

take a look to the following code

@       __CONFIG    _CONFIG1L, _PLLDIV_3_1L & _CPUDIV_OSC1_PLL2_1L
@       __CONFIG    _CONFIG1H, _FOSC_HSPLL_HS_1H
@       __CONFIG    _CONFIG2L, _VREGEN_OFF_2L
@       __CONFIG    _CONFIG2H, _WDT_OFF_2H 
@       __CONFIG    _CONFIG3H, _MCLRE_OFF_3H & _PBADEN_OFF_3H 
@       __CONFIG    _CONFIG4L, _LVP_OFF_4L & _XINST_OFF_4L & _DEBUG_OFF_4L
DEFINE OSC 48
led VAR PORTD
'changed WORD for BYTE ... using 32bit int for 8bit value is taking more cycle to do operation to it
step0 VAR byte
step1 VAR byte
step2 VAR byte
step3 VAR byte
step4 VAR byte
step5 VAR byte
step6 VAR byte
step7 VAR byte
cycles CON 2

' Change limits for steps to play around 0 or 100% brightness
' Change steps for different duration of ramps
' Works good even with high brightness LEDs, harder to control linearly


fade:


For step0=0 TO 100
PWM led.0,step0,cycles
Next
For step1=0 TO 100
PWM led.1,step1,cycles
Next
For step2=0 TO 100
PWM led.2,step2,cycles
Next
For step3=0 TO 100
PWM led.3,step3,cycles
Next
For step4=0 TO 100
PWM led.4,step4,cycles
Next
For step5=0 TO 100
PWM led.5,step5,cycles
Next
For step6=0 TO 100
PWM led.6,step6,cycles
Next
For step7=0 TO 100
PWM led.7,step7,cycles
Next

For step0=100 TO 1 STEP -1
PWM led.0,step0,cycles
Next
For step1=100 TO 1 STEP -1
PWM led.1,step1,cycles
Next
For step2=100 TO 1 STEP -1
PWM led.2,step2,cycles
Next
For step3=100 TO 1 STEP -1
PWM led.3,step3,cycles
Next
For step4=100 TO 1 STEP -1
PWM led.4,step4,cycles
Next
For step5=100 TO 1 STEP -1
PWM led.5,step5,cycles
Next
For step6=100 TO 1 STEP -1
PWM led.6,step6,cycles
Next
For step7=100 TO 1 STEP -1
PWM led.7,step7,cycles
Next

GoTo fade

End

What i want is to fade ON all led each by each while keeping them ON
then after Turn them OFF (while fading) one by one

The code only do pwm on 1 led at time only :S

Any clues ?

oh btw, searching through the forum is PITA ... it doesn't take words like PWM , because it's too short ... hence rendering the search practically useless for "Multiple PWM"

Cheers,


Best Regards,

Laurent

[skimask]

Thanks ! You fix all my problems !
How to have multiple pwms output ?

PWM is a blocking command. You can only do one PWM at any one time, PBP only has one 'hand' available to do PWM. You have to write good interrupt driven software to do multiple channels. Well, you don't HAVE to do anything. There are many ways to do multiple channel PWM, software based PWM...

oh btw, searching through the forum is PITA ... it doesn't take words like PWM , because it's too short ... hence rendering the search practically useless for "Multiple PWM"

Look in the FAQ's...

[krohtech]

I use Darrel’s Multi SPWM code to get 8 ch of PWM at 100 Hz. Works GREAT (((thanks Darrel)))

See:
http://www.pbpgroup.com/modules/wfse...p?articleid=12

[skimask]

I use Darrel’s Multi SPWM code to get 8 ch of PWM at 100 Hz. Works GREAT (((thanks Darrel)))
See:
http://www.pbpgroup.com/modules/wfse...p?articleid=12

Forgot about that one.
I've done it myself on an 18F8722 to the tune of 48 channels of LEDs at 40Mhz, refreshing at 7152.2Hz. Same principle, but relatively easily done. If you can do 2 channels, you can do 100.

[krohtech]

Forgot about that one.
I've done it myself on an 18F8722 to the tune of 48 channels of LEDs at 40Mhz, refreshing at 7152.2Hz. Same principle, but relatively easily done. If you can do 2 channels, you can do 100.

Hey skimask,

How did you do 48 CHannels. Did you have to modify Darrel's asm code?

[skimask]

Hey skimask,

How did you do 48 CHannels. Did you have to modify Darrel's asm code?

Didn't use DT's code for that one.
Just a simple Tmr0 overflow running as fast as it can... When the interrupt hits, I update the channels/pins according to their duty cycle 'register' variable. Outside the interrupt sub, in the main loop, I update the duty cycle 'register' itself depending on whatever I'm doing. Theoretically, assuming there's enough clock cycles in the day, you can run as many channels as you want.
On the '8722, you could have up to 70 channels of halfway decent PWM (well, 69, one of those pins is input only if I remember right). I only stopped at 48 'cause that's all the red LEDs I had on hand at the time.

[krohtech]

Can each channel have different duty cycles?

This is quite a bit over my head, could you post a code example?

[skimask]

Can each channel have different duty cycles?

As many as can be had. Only limitation is processor cycles. Depending on what freq the PWM gets run at, you end up running out of enough cycles to adjust all of the channel's PWM's in the main loop and might run out of cycles in the interrupt loop to update all of the channels before the next interrupt hits.

[ELCouz]

I need at least 16-24 channels, i will investigate more on the forum, if anyone have spotted something useful please be nice to post it here

Just a simple Tmr0 overflow running as fast as it can... When the interrupt hits, I update the channels/pins according to their duty cycle 'register' variable. Outside the interrupt sub, in the main loop, I update the duty cycle 'register' itself depending on whatever I'm doing.

That's exactly what I've done in C but that wasn't refresh at the same speed at yours... i was running the outputs @ 220.4 hz but the effects that i need to do with the leds wasn't good , kinda jerky sometimes even with 48mhz (12mips) clock, I ran out off juice :S !

Btw,skimask why not post it to the code examples or a little example here? I respect your work, if you don't want to share your code it's ok i understand that ...

Have a nice day you guys!

You really helped me

I really love this forum, every time i come, i learn something :P

Best Regards,
Laurent

[skimask]

Btw,skimask why not post it to the code examples or a little example here? I respect your work, if you don't want to share your code it's ok i understand that ...

Exactly which piece of work do you respect the most?
Most people don't respect my work at all, if only because it's basically unreadable, as I'm sure it would be to you. The style of coding I've chosen and use is almost unreadable to the person that's not used to it. Ask anybody that's been around awhile, they'll tell you the same thing. The High Colonic Master...yep...that's me...

[Bruce]

And: what : makes : your : coding : style : different : than : anyone : elses :....;o}

[skimask]

And: what : makes : your : coding : style : different : than : anyone : elses :....;o}

I like to think of it in these terms:
My code takes up less space on the screen...
Most other's code takes up less space in the brain...
:::::::::::::::::::::::::::::::::::::::::::::::::: :::::::::

[Archangel]

I like to think of it in these terms:
My code takes up less space on the screen...
Most other's code takes up less space in the brain...
:::::::::::::::::::::::::::::::::::::::::::::::::: :::::::::

I'm : having : a : stack : overflow :

[skimask]

I'm : having : a : stack : overflow :

Me too :::::::::::::::::::)))))))))))))))))))))

At any rate, just to prove I'm not an _ _ _ (insert word here)...here's some cut down 3 channel code I use on a 16F628A running at 20Mhz.
Interrupt driven 8 bit, 76Hz software PWM for RGB.
You got a timer (Timer 0) running as fast as it can, interrupting at 19,531.25 Hz. That increments a byte counter, pwmcount.
You got 3 duty cycle registers (reddcr, greendcr, bluedcr). If the individual duty cycle register is less than the pwmcounter, the LED stays on, if not the LED goes out.
Change the DCRs in the mainloop and it should work.
Like I said, this is cut down code. The full code works just fine for me, but I took out all of the serial interface code, the 5 button interface code and the serial LCD code. Might work, might not. Pay attention to how the hardware hooks up (3 LEDs on PortA, that's it).
The code should fade the 3 LEDs each in turn in about one second from off to full brightness, over and over again, 3 seconds for all 3 LEDs, wash lather rinse repeat.

But if you can't make an LED blink in the first place, DO THAT BEFORE YOU TRY THIS!

'PWM loop is @ 19,531.25 hz, w/ 256 cnt res, Freq of PWM is 76.2939hz
@ DEVICE PIC16F628A , HS_OSC , WDT_OFF , PWRT_ON , MCLR_ON , BOD_ON , LVP_OFF , PROTECT_OFF	'HS 20mhz osc, watchdog off, powerup timer on, mclr external, brown out detect on, low volt program off , code protect off for now
resetplaceholder:
DEFINE		OSC		20	'20mhz
DEFINE		NO_CLRWDT	1	'don't clear the watchdog timer, I'm not using it anyways
DISABLE				'disable software interrupt checks
CLEAR					'clear out the ram and do a software 'reset'
redled var porta.0:greenled var porta.1:blueled var porta.2:chx var porta:reddcr var byte:greendcr var byte:bluedcr var byte:ledtemp var byte:pwmcount var byte
temp var byte : temp2 var word
startupholder:	goto skipsubs		'skip over all the commonly used subroutines
ON INTERRUPT GOTO INTHANDLER
DISABLE INTERRUPT
INTHANDLER:	if intcon.2 = 1 then						'if tmr0 rolled over
			intcon.2 = 0						'reset timer 0 overflow flag
			if pwmcount = 0 then				'if pwmcounter has rolled over
				if reddcr <> 0 then ledtemp.0 = 1	'turn off red leds if dcr is 0 (dcr = duty cycle register for LED), otherwise turn it on
				if greendcr <> 0 then ledtemp.1 = 1	'turn off green leds if dcr is 0
				if bluedcr <> 0 then ledtemp.2 = 1	'turn off blue leds if dcr is 0
				chx = ledtemp		'update port pins of led status (on or off), can do this because all the LEDs are on the same port
				endif
			endif
			if reddcr < pwmcount then ledtemp.0 = 0	'if the channel's dcr (duty cycle register) is less than the pwmcounter, turn that channel off, otherwise, leave it on ( < rather than <=, fixes problem with pulsing at high rates)
			if greendcr < pwmcount then ledtemp.1 = 0
			if bluedcr < pwmcount then ledtemp.2 = 0
			chx = ledtemp : pwmcount = pwmcount + 1	'update the port pins and increment the pwmcount
		endif
intfinish:	RESUME
'commonly used subroutines start here
alloff:		reddcr = 0 : greendcr = 0 : bluedcr = 0 : return	'turn off all leds thru dcr's
allon:		reddcr = 255 : greendcr = 255 : bluedcr = 255 : return     'turn on all leds
skipsubs: option_reg=8:pie1=$20:trisa=0:porta=0:trisb=$ef:portb=$10:t1con=0:t2con=0:cmcon=7:ccp1con=0:vrcon=0:pir1.5=0:ledtemp=0:redled=0:blueled=0
               greenled = 0 : intcon = $e0
ENABLE INTERRUPT
mainloop:
for temp=0 to 255:reddcr=temp:for temp2=0 to 2603:pauseus 1:next temp2:next temp:for temp=0 to 255:greendcr=temp:for temp2=0 to 2603:pauseus 1:next temp2
next temp:for temp=0 to 255:bluedcr=temp:for temp2=0 to 2603:pauseus 1:next temp2:next temp:goto mainloop	'do it over again
END

And for those that don't like colons...

'PWM loop is @ 19,531.25 hz, w/ 256 cnt res, Freq of PWM is 76.2939hz
@ DEVICE PIC16F628A , HS_OSC , WDT_OFF , PWRT_ON , MCLR_ON , BOD_ON , LVP_OFF , PROTECT_OFF	'HS 20mhz osc, watchdog off, powerup timer on, mclr external, brown out detect on, low volt program off , code protect off for now
resetplaceholder:
DEFINE		OSC		20	'20mhz
DEFINE		NO_CLRWDT	1	'don't clear the watchdog timer, I'm not using it anyways
DISABLE				'disable software interrupt checks
CLEAR					'clear out the ram and do a software 'reset'
redled var porta.0
greenled var porta.1
blueled var porta.2
chx var porta
reddcr var byte
greendcr var byte
bluedcr var byte
ledtemp var byte
pwmcount var byte
temp var byte
temp2 var word
startupholder:
goto skipsubs		'skip over all the commonly used subroutines
ON INTERRUPT GOTO INTHANDLER
DISABLE INTERRUPT
INTHANDLER:
if intcon.2 = 1 then						'if tmr0 rolled over
intcon.2 = 0						'reset timer 0 overflow flag
if pwmcount = 0 then				'if pwmcounter has rolled over
if reddcr <> 0 then
ledtemp.0 = 1	'turn off red leds if dcr is 0 (dcr = duty cycle register for LED), otherwise turn it on
endif
if greendcr <> 0 then
ledtemp.1 = 1	'turn off green leds if dcr is 0
endif
if bluedcr <> 0 then
ledtemp.2 = 1	'turn off blue leds if dcr is 0
endif
chx = ledtemp		'update port pins of led status (on or off), can do this because all the LEDs are on the same port
endif
endif
if reddcr < pwmcount then
ledtemp.0 = 0
endif
'if the channel's dcr (duty cycle register) is less than the pwmcounter, turn that channel off, otherwise, leave it on ( < rather than <=, fixes problem with pulsing at high rates)
if greendcr < pwmcount then
ledtemp.1 = 0
endif
if bluedcr < pwmcount then
ledtemp.2 = 0
endif
chx = ledtemp
pwmcount = pwmcount + 1	'update the port pins and increment the pwmcount
endif
intfinish:
RESUME
'commonly used subroutines start here
alloff:
reddcr = 0
greendcr = 0
bluedcr = 0
return	'turn off all leds thru dcr's
allon:
reddcr = 255
greendcr = 255
bluedcr = 255
return     'turn on all leds
skipsubs:
option_reg = 8
pie1 = $20
trisa = 0
porta = 0
trisb = $ef
portb = $10
t1con = 0
t2con = 0
cmcon = 7
ccp1con = 0
vrcon = 0
pir1.5 = 0
ledtemp = 0
redled = 0
blueled = 0
greenled = 0
intcon = $e0
ENABLE INTERRUPT
mainloop:
for temp = 0 to 255
reddcr = temp
for temp2 = 0 to 2603
pauseus 1
next temp2
next temp
for temp = 0 to 255
greendcr = temp
for temp2 = 0 to 2603
pauseus 1
next temp2
next temp
for temp = 0 to 255
bluedcr = temp
for temp2 = 0 to 2603
pauseus 1
next temp2
next temp
goto mainloop	'do it all over again
END

[Darrel Taylor]

3 channels ...

No, No, No!

You said you could do 48 channels.
That's what they want.

Frankly, I'd like to see 48 chanels of 8-bit software PWM too.
<br>

[skimask]

3 channels ...
No, No, No!
You said you could do 48 channels.
That's what they want.
Frankly, I like to see 48 chanels of 8-bit software PWM too.
<br>

Well, the basics are there (as you well know)...
And the 48 channels...I'll post some differences:
18F8722 vs. 16F628A
40Mhz vs. 20Mhz
Timer 0 prescale is 1:2 instead of 1:1, thereby keeping the same 76Hz Freq of PWM...
...got 512 cycles to work with instead of 256. 48 channels in 512 cycles = 10 cycles per channel with even some extra leftover.
Code is practically the same, except:
PWM 0-7 on PortB (along with PGC/PGD/PGM, LVP disabled)
PWM 8-15 on PortD (serial comm's on PortC, along with a couple of buttons)
PWM 16-23 on PortE
PWM 24-31 on PortF
PWM 32-39 on PortH
PWM 40-47 on PortJ
The rest of the pins are either used for buttons, indicators, or whatever, the usual crap.

At first I had a heck of a time finding enough cycles to run everything thru the interrupt loop and not miss any interrupts, that's when I figured out to keep all of the PWM channels in blocks of 8, byte writes to each port instead of bit writes saved just enough time to make it work reliably and leave a bit of time leftover to actually have a MAINLOOP to do other things. There's a few other shortcuts in the interrupt loop, such as checking the high bit of each DCR instead of checking the whole thing when doing the comparisons. That's one of the places where the PWM jitters a bit (I never said it was a ROCK SOLID 48 channels!). If too many of the channels have to take the jump where it sets or resets the pin, the PWM for all of them hiccups a bit. Worst case scenario is when all DCRs for each channel are exactly the same, they all have to take the jump to reset the pins. But if they're spread out, it's not bad at all. I can even trace it on the 'scope and only get a couple of us of jitter.

THERE! Now everybody knows all of my secrets!

You know, come to think of it...this might be one of those things just would go good with that little 'code optimization' exercise that went on awhile back.
Get an '8722 to use every available pin for software driven PWM'ing of LEDs, while using the serial port for control at high speed, and still have solid PWM.

[Archangel]

Me too :::::::::::::::::::)))))))))))))))))))))

At any rate, just to prove I'm not an _ _ _ (insert word here)...

HMMMMMMMMM . . . . not an _ _ _ . . . what could that be . . ( Joe mutters to himself with a big grin on his ugly mug) E G G . . . no that's too obvious . . D O G . . . perhaps, no . . . HMMMMMM , what could it be? D O N K E Y? No too many letters . . . HMMMMMMM . . . What could it be . . . ? HE HE HE HE HE HE . . . .

[skimask]

HMMMMMMMMM . . . . not an _ _ _ . . .

I'll even give you a hint there...
Since I wrote 'not AN _ _ _' vs. 'not A _ _ _'
then it can be assumed that the 3 letter word does in fact start with a vowel...

[Darrel Taylor]

...
Since I wrote 'not AN _ _ _' vs. 'not A _ _ _'
then it can be assumed that the 3 letter word does in fact start with a vowel...

I had come up with so many possibilities
Especially after reading this ...

<a href="http://www.dailywritingtips.com/using-a-and-an-before-words/">http://www.dailywritingtips.com/using-a-and-an-before-words/</a>
<br>

[Archangel]

I'll even give you a hint there...
Since I wrote 'not AN _ _ _' vs. 'not A _ _ _'
then it can be assumed that the 3 letter word does in fact start with a vowel...

hmmmmmmmm . . . not AN . . . EAR . . . OWL . . . OAR . . . ? Be very careful if you pick one because there's lots of 3 letter words you do not want to be Lucky for me you are <font color=red>not</font color> AN overly sensitive drama queen ! and allow me to pick on you a little . . . all in fun though!

[skimask]

I had come up with so many possibilities
Especially after reading this ...
<a href="http://www.dailywritingtips.com/using-a-and-an-before-words/">http://www.dailywritingtips.com/using-a-and-an-before-words/</a>
<br>

Point taken.

hmmmmmmmm . . . not AN . . . EAR . . . OWL . . . OAR . . . ? Be very careful if you pick one because there's lots of 3 letter words you do not want to be Lucky for me you are not AN overly sensitive drama queen ! ans allow me to pick on you a little . . . all in fun though!

APE...AXE...EMU...UNK...AKA...
Drama Queen!!! WTH?
Talk about getting off track...

[mackrackit]

I'll even give you a hint there...
Since I wrote 'not AN _ _ _' vs. 'not A _ _ _'
then it can be assumed that the 3 letter word does in fact start with a vowel...

I found another hint

The High Colonic Master...yep...that's me...

and another

And for those that don't like colons...

So I used Google and came up with this
http://en.wikipedia.org/wiki/Colon_(anatomy)

These puzzles are fun, when can we do another?

Sorry skimask, I could not help myself

[krohtech]

I need at least 16-24 channels, i will investigate more on the forum, if anyone have spotted something useful please be nice to post it here

Hi Laurent

I have had great sucess with Darrel's DT_INTS-18 and SPWM_INT . I am doing 16 ch of PWM on a pic 18F2410 32 MHz. The pwm is running at 100Hz 8 bit resolution.

Thanks Darrel (I never tire of saying that)

take a look at this thread:
http://www.picbasic.co.uk/forum/showthread.php?t=8088

[ELCouz]

Hi,

Just a little update, sorry for being late to answer I've be on a road trip to Quebec all the weekend ... yeah rock - on :P

Well I'm tired so i will investigate further your nice posts guys tomorrow.

See ya kids :P hehe

Best Regards,
Laurent

[ELCouz]

It works !!!

I'm using the Darrel Taylor's DT_INTS-18 & SPWM_INT code.

Everything is running smooth!

Thanks everyone for the help!

Have a nice day,

Best Regards,

Laurent