Arduino to MAX485 (DMX controller)

[Nickk2057]

i could not find my previous post.... so i had to make a new one. anyways.... am trying to set up a DMX controller with my Arduino board i have here. am having an error code in the compiler.... not sure what it means. could you all help me?

here is what it says.

Arduino: 1.6.0 (Windows , Board: "Arduino Uno"

C:\Users\Drawing\AppData\Local\Temp\build3127169777972709416.tmp/core.a(HardwareSerial0.cpp.o): In function `Print':
C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/HardwareSerial0.cpp:48: multiple definition of `__vector_18'
receiver_rev15.cpp.o:/Arduino/receiver_rev15.pde:156: first defined here
collect2: error: ld returned 1 exit status
Error compiling.

  This report would have more information with
  "Show verbose output during compilation"
  enabled in File > Preferences.

[kxenos]

Well, can you show us the print statement in line 156?

Also, I think dmx equipment works in 256kbps. Is arduino capable of such baudrate?


edit: so -> show

[mikeselectricstuff]

Well, can you so us the print statement in line 156?

Also, I think dmx equipment works in 256kbps. Is arduino capable of such baudrate?

DMX is 250kbaud - easy enough on an AVR

[Nickk2057]

I really do not know of how to do Arduino stuff honestly. Am still learning of it without any coding. So this is why I am asking for help.

[kingofkya]

I seam to recall an issue with arduneo and running at high baud rates like dmx i think you have to screw with the interrupt handler to get to working. Your better off starting with a stock avr setup.

Assuming a atmea328 based ardueno.

also try not doing serial prints and see if it compiles.

[mikeselectricstuff]

I seam to recall an issue with arduneo and running at high baud rates like dmx i think you have to screw with the interrupt handler to get to working. Your better off starting with a stock avr setup.

Assuming a atmea328 based ardueno.

also try not doing serial prints and see if it compiles.

250kbaud is only 40uS per byte, 640 clocks, so plenty of time to handle it. Handling the Break condition is something that a standard serial handler will probably not deal with properly but it's pretty straightforward - for receive, framing error = break, for transmit, use a timer to generate the break time. I don't recall offhand if the AVR UART can generate a break, if not you just disable the UART tx function and control the pin directly during the break time.

[kingofkya]

Ah yeah that sounds about right, i haven;t played with normal dmx stream in a while so i was a bit fuzzy:)