PICBasic newbie problem

[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.