USART+PWM Problem

[JEC]

Turns out that a few months ago, Microchip posted app notes for

* DMX512 transmission
* DMX512 reception
* Software-based 3 color PWM generation

Granted, it's all written in assembly. And it may not be quite as user-friendly to PBP newbies as DT's Instant Interrupts / SSPWM (very nice, BTW!).

But they can gather all 512 channels of dimmer data in 27 lines of .asm code. Pretty neat!

It's elegantly written, very compact and fairly easy to follow. Their write-up on DMX gives a nice overview of the various stages of the signal and what the processor needs to do during each.

Their trick for generating the break signal on the transmit side is nice, too.

Their DMX receive code is *not* interrupt based, but the PWM routine is.

Check out notes #1074 and #1076

Link:

http://www.microchip.com/stellent/id...GE&nodeId=2048

Best,

JEC

[alex-x]

Dear JEC ;
i looked to that site but all codes are in asm i need in PBP if i can make it better for me .really i want to make it by myself since a week and i know it is not so good to want code from peoples but really i dont know anything about the this commination in picbasicpro

i read many documents and some code too but all in asm they explain everything in assembly language and when i want to make same thing in pbp then i have problem on interupts i think how can i solve it*?

i have seen your code in the forum and copyed it for my devices but couldnt make it yet your code was for "'F88 @ 16 MHz" but i have f877 and 20 mhz osc the code that what i posted here it is your code .do you have some example for me in picbasicpro only for beginner i need only led intensty
( PWM ) nothing more i tryed it like this small code too before but also problem (i look for adres on dipsw)


' PIC16F876 + 20 MHz
DEFINE OSC 20
@ DEVICE HS_OSC

DEFINE HSER_BITS 9
DEFINE HSER_RCSTA 208
DEFINE HSER_TXSTA 101
DEFINE HSER_BAUD 250000
DEFINE HSER_CLROERR 1

SYMBOL IN =PORTC.0
SYMBOL LED =PORTC.3 'LED

INPUT IN

TMP VAR WORD
TMP1 VAR WORD
VALORE VAR byte[8]
BREAK VAR WORD
NDMX VAR WORD
DATI VAR WORD
Clear

ADCON0=0
ADCON1=7

OPTION_REG.7=0
FOR TMP=0 TO 10
TOGGLE LED
PAUSE 200
NEXT TMP
LOW LED

MAIN:

NDMX=0
NDMX.0=PORTA.1
NDMX.1=PORTA.0
NDMX.2=PORTB.7
NDMX.3=PORTB.6
NDMX.4=PORTB.5
NDMX.5=PORTB.4
NDMX.6=PORTB.3
NDMX.7=PORTB.2
NDMX.8=PORTB.1
NDMX.9=PORTB.0

ndmx = ndmx ^ %0000001111111111
DATI=0
PULSIN in,0,break

IF BREAK>=44 THEN

HSERIN 2000,MAIN,[tmp,tmp1]
if tmp<>0 and tmp1<>0 then
goto main
endif

FOR TMP=1 TO ndmx
HSERIN 10,main,[tmp1]
NEXT TMP

FOR tmp=1 TO 64
hserin 10,EXIT,[VALORE[tmp]]
DATI=DATI+1
NEXT TMP

EXIT:
FOR TMP=1 TO DATI
VALORE[TMP]=VALORE[TMP]/4
NEXT TMP

'---------- here code that what i want to make for leds -----------------



ENDIF


GOTO MAIN

[T.Jackson]

Yeah - I think you're trying to bite off a bit more than you can chew. Better to start with something a bit simpler and gradually progress your skills along the way.

[alex-x]

:-) thanks

i have made many projects with pic but dmx is not like "led open or close"
it is different

i wait answer only who knows about the dmx and who can help me to solve this problem and if you want i pay too

[skimask]

:-) thanks

i have made many projects with pic but dmx is not like "led open or close"
it is different

i wait answer only who knows about the dmx and who can help me to solve this problem and if you want i pay too

It's not a matter of money...but if that's the way you want to go...so be it...
Do you know what a good software developer charges for those services these days? It's not cheap for a good, reliable, bug-free product...
(quite frankly neither do I...I've been paid for services before, but nothing with a contract, just a 'gentleman's agreement)
Looks like this is one that gets fed the corn and never learns to farm...

[alex-x]

it is ok friends , thanks for everything
i decided to buy a small device for me

[DynamoBen]

Jec, good find thanks for the info!