More than a single function
Hello All,
I have been watching videos and seeing actual products that use PICs and have noticed the PICs doing two things at once. For instance, I have witnessed two separate outputs flashing at different rates. Kind of like watching two vehicles with their turn signals on and the flashing lights go in sync and out of phase with each other and then back in sync again.
How can one do this with PBP? Another example is pwming an output at one frequency while another output is at a different frequency. I thought the PIC can only do one thing at a time. Anyone have any example code?
Thanks,
Tony
Re: More than a single function
Quote:
Anyone have any example code?
This uses interrupt routines and Timers as one example.
http://www.picbasic.co.uk/forum/cont...le-LED-flasher
Have you considered Persistence of Vision? Some visual routines use this by changing a display at 60Hz so the display looks static but other parts of the program are executing many times in between the display refreshes, changing another LED for example.
Clear as mud?
It is just a case of perception it is not real magic just an illusion!
Re: More than a single function
This is a good demonstration
http://www.picbasic.co.uk/forum/cont...ck-by-Pimentel
of the reinvention of the wheel.
Re: More than a single function
I was thinking something more along these lines.
http://www.youtube.com/watch?v=SKe67xZG8Sg
Re: More than a single function
Looks simple depending on the pic you are using.
Post your code.
Re: More than a single function
See post #3 in this thread ...
MIBAM - (Mirror Imaged Bit Angle Modulation)
Cylon Scanner
http://www.picbasic.co.uk/forum/showthread.php?t=10564
Re: More than a single function
This thread has split into two parts, but it still covers being able to do two things at once. To better explain my first question, if I made two boards, each controlling an LED and made one single flash at 1 Hz and the other quadruple flash at 2 Hz, then the LEDs would go in and out of phase with each other. My first question was how do I implement this into one chip where you can change the pulse count and speed of one output and have another output doing something else concurrently? I know it can be done because I have seen it on other products.
Mind you on one of these products, the output that is doing single flash is also part of a trigger, so that when the trigger impulse is received, the pattern changes. I'm thinking an interrupt routine, but can that routine cause an output or two to pulse while the chip is doing something else?
Another method was using shift registers, but I found another circuit that did not.
The MIBAM I am familiar with. I haven't played with it yet, but can it do these effects, or do the LEDs just fade to 0? Here is a better representation of the effects.
http://www.youtube.com/watch?v=28odSOh-Aog#t=25
He provides the code for his chips here, and explains how to assemble them in MPLAB, but is there any way to implement those functions in PBP? Obviously the code doesn't transfer into PBP as it does not recognize it. I know it's written for MPASM, but can PBP code not do anything like this?
A short example of the patterns he's written:
Code:
; ----------------------------------
; See pwmc_SeqMacro.inc for information on the format of the sequence data
;
; ----------------------------------
; seq 01
control 0,4
hold 8
sdat 3,0,0,0,0,0,0,0
hold 8
sdat 2,3,0,0,0,0,0,0
hold 8
sdat 1,2,3,0,0,0,0,0
hold 8
sdat 1,1,2,3,0,0,0,0
hold 8
sdat 0,1,1,2,3,0,0,0
hold 8
sdat 0,0,1,1,2,3,0,0
hold 8
sdat 0,0,0,1,1,2,3,0
hold 8
sdat 0,0,0,0,1,1,2,3
hold 8
sdat 0,0,0,0,0,0,1,3
hold 8
sdat 0,0,0,0,0,0,0,3
hold 8
sdat 0,0,0,0,0,0,3,2
hold 8
sdat 0,0,0,0,0,3,2,1
hold 8
sdat 0,0,0,0,3,2,1,1
hold 8
sdat 0,0,0,3,2,1,1,0
hold 8
sdat 0,0,3,2,1,1,0,0
hold 8
sdat 0,3,2,1,1,0,0,0
hold 8
sdat 3,2,1,1,0,0,0,0
hold 8
sdat 3,1,0,0,0,0,0,0
seqend
; ----------------------------------
; seq 02
control 0,4
hold 11
sdat 3,0,0,0,0,0,0,0
hold 11
sdat 2,3,0,0,0,0,0,0
hold 11
sdat 1,2,3,0,0,0,0,0
hold 11
sdat 1,1,2,3,0,0,0,0
hold 11
sdat 0,1,1,2,3,0,0,0
hold 11
sdat 0,0,1,1,2,3,0,0
hold 11
sdat 0,0,0,1,1,2,3,0
hold 11
sdat 0,0,0,0,1,1,2,3
hold 11
sdat 0,0,0,0,0,0,1,3
hold 11
sdat 0,0,0,0,0,0,0,3
hold 11
sdat 0,0,0,0,0,0,3,2
hold 11
sdat 0,0,0,0,0,3,2,1
hold 11
sdat 0,0,0,0,3,2,1,1
hold 11
sdat 0,0,0,3,2,1,1,0
hold 11
sdat 0,0,3,2,1,1,0,0
hold 11
sdat 0,3,2,1,1,0,0,0
hold 11
sdat 3,2,1,1,0,0,0,0
hold 11
sdat 3,1,0,0,0,0,0,0
seqend
; ----------------------------------
It's simpler to just write what the LED's intensity should be at said position. Maybe MIBAM can do this, but do any modifications have to be made to the MIBAM code?
I was wondering if PBP code could be written in a way to implement "some" of these features. I would like the ability to write 0 through whatever limit to specify LED intensity instead of pwm. Also, this way, you can pwm more than one output.
I know DT's MIBAM can do some of those effects, but I was wondering how to implement features as being able to write "sdat 0,1,1,2,3,0,0,0" to control pwm of the outputs.
I have written other types of flashing sequences and would like to implement some other patterns like these. Any way of utilizing some of the code and not all of it?
Thanks,
Tony
Re: More than a single function
MIBAM can do all of the effects in that video.
Although his code only has 4 dimming levels. MIBAM has 256 levels.
If you have PBP3 the "sdat" command structure can be duplicated with USERCOMMANDS.
Re: More than a single function
Quote:
Originally Posted by
ERMEGM
Hello All,
I have been watching videos and seeing actual products that use PICs and have noticed the PICs doing two things at once. For instance, I have witnessed two separate outputs flashing at different rates. Kind of like watching two vehicles with their turn signals on and the flashing lights go in sync and out of phase with each other and then back in sync again.
How can one do this with PBP? Another example is pwming an output at one frequency while another output is at a different frequency. I thought the PIC can only do one thing at a time. Anyone have any example code?
Thanks,
Tony
A PIC can only do one thing at a time. Or should I say it can only run one program at a time unlike computers for example. As Darrel has shown PBP can be used to give the effects you want. The appearance that you get of two things being done at the same time is an illusion created by POV.
If anyone has a way to make a PIC multitask please let me know.
Re: More than a single function
PIC's can do many things at the same time.
It can only execute one instruction of the program at a time ...
But simultaneously, all the hardware peripherals are doing their "thing" too.
Timers are counting, the A/D can be converting, LCD drivers are scanning, USARTS and SSP modules are sending/receiving data... etc.
It can be difficult to keep track of everything that's going on.
But when you do get a handle on it ... amazing feats of magic will follow.
You cannot say PIC's only do one thing at a time.
Re: More than a single function
Thanks Darrel
Quote:
You cannot say PIC's only do one thing at a time.
That was what I was trying not to say.
Quote:
But they can only execute one instruction at a time.
Is what I was trying to say. But you said it better.
