USART+PWM Problem

[dreamman]

Hi , i tryed this code but it is not working as a pwm for led
where is the problem?

is it here ? How can we use newlevel1 as a pwm value?

"" pwm portc.2, newlevel1 ,100 'i want dimming a LED on PORTC.2"""




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DEFINE OSC 20
DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h
DEFINE HSER_SPBRG 4
DEFINE HSER_BAUD 250000
DEFINE HSER_CLROERR 1



counter VAR word
idleflag VAR WORD
dummy VAR WORD
RCIF VAR byte
startcode VAR WORD
aminus VAR WORD
adresse_grada VAR WORD
x VAR WORD
newlevel1 VAR WORD
ADCON0=0
ADCON1=7
adresse_grada = 2


checkdmx:

counter = 1
pulsin portc.7,0,counter
if counter = 0 then
idleflag = 1
endif


if counter < 40 then checkdmx

dummy = RCREG
dummy = RCREG
SPBRG = 0
TXSTA.2 = 0 'brgh = 0
TXSTA.4 = 0
RCSTA.7 = 1
RCSTA.6 = 0
RCSTA.4 = 0
RCSTA.4 = 1

while RCIF = 0:wend

startcode = RCREG

if startcode <> 0 then checkdmx

aminus = adresse_grada - 1

for x = 1 to aminus
while RCIF = 0:WEND
dummy = RCREG
next x

newlevel1 = RCREG
pwm portc.2, newlevel1 ,100 ' HERE PROBLEM I THINK
RCSTA.7 = 0

goto checkdmx
return

[mister_e]

Hi and welcome on the forum.

1. Those DEFINE's HSER_xxxx are not needed if you're not using HSERIN.

2. it look like another DMX routine to me

What's working and what doesn't?

Do you understand the DMX protocol?

How about your schematic, configuration fuses, PIC#?

[dreamman]

Hi thanks yes im new in forum ,i was looking for dmx sample code in picbasicpro and came here
i have forund that code in the forum here (There is Same Code İn All thread ) :-) is it so difficult in PBP ?
and just tryed it but not working it is not real code ithink only sample

((( Schema is not so problem if you have any pic that which one has Usart (Rx) and (Hpwm) than it is ok and also u will need an for example SN75176A,SN75179B ( i use them in my controller ) i fu need more wpm chanels then u have to writte pwm code but if u need only 1 or 2 than you have to find a pic that which one has 2-3 hpwm ))) and 20 MHZ osc for 250kb baud rate

I know everything about the dmx512 protocol ,
http://www.dmx512-online.com/
http://www.usitt.org/standards/DMX512.html

it is 8n2 1 start 8 data and 2 stop , it is easy to receive it with usart config i know
What is it, how does it work and how can we receive it and i use it also in my projects and i dont have any problem i use pic assembly in my projects ,you can find example code in microchip website also for dmx512 transmitter and receiver master - slave

i just wanted to learn i have seen many code in forum about dmx512 and highspeed comm.. and some body said that has solved his dmx problem whit this code here in this adress in the forum
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http://www.picbasic.co.uk/forum/show...ghlight=dmx%2A

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Im not so good on the PicBasicPro i use assembly for my devices but when i look to code i didnt see any interupts and something also missing here
how is it possible to use it for pwm ?
did you make also any trying for dmx512 in pbp?
i just want to learn how is the interupts here cause when i use it in assembly i have some interupts routin in code and i i can make dmx512 receive in pbp too then it can be fine for me cause it takes more time to make projects in assembly pbp and c is better for time if you have big projects
When i look to exapmles also for rs485 they give it as a lowbaudrate(9400 and serin command to use) and PC to Pic not so high baudrate in examples what you found on the net..
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Maybe SomeBody Can develop This code here and can teach us how to use "hserin" command to decode chanel and make interrupts code.
if anybody need in assembly i can help but here is pbp forum and when i look to forum many friends has problem in dmx512 protocol to decode it in pbp and also same code in everythread.

There is many site about the dmx512 protocol but they just tell the protocol not any code example or schema you can learn it in 20 min that what is it but the problem is how to use it in code ...

[rlmack35]

SSPWM ??

how is it?

MiBAM is much smoother (personal opinion). You can dim 24 pins with very little processing power. Send the value and it retains it until you change it.