DMX at RS485 interface

[roose]

Hello,

i try to use the RS485 interface of the Mega to control a lamp via DMX. So far without luck.

What i tried:

DMXSerial Library

– i edited the DMXSerial_avr.h file for using UART3 (Serial 3)

added the following lines (not sure it’s correct):

Code:

#define DMX_USE_PORT3#if defined(DMX_USE_PORT3)
#define UCSRnA UCSR3A
#define RXCn RXC3
#define TXCn TXC3
#define UCSRnB UCSR3B
#define RXCIEn RXCIE3
#define TXCIEn TXCIE3
#define UDRIEn UDRIE3
#define RXENn RXEN3
#define TXENn TXEN3
#define UCSRnC UCSR3C
#define USBSn USBS3
#define UCSZn0 UCSZ30
#define UPMn0 UPM30
#define UBRRnH UBRR3H
#define UBRRnL UBRR3L
#define UDRn UDR3
#define UDREn UDRE3
#define FEn FE3
#define USARTn_RX_vect USART3_RX_vect
#define USARTn_TX_vect USART3_TX_vect
#define USARTn_UDRE_vect USART3_UDRE_vect

 

– uploaded the library example (without any warnings/errors)

Any ideas?

Thanks!

Roose

[roose]

Found the solution myself.

I had to enable the tx mode:

digitalWrite(75, HIGH);

digitalWrite(76, HIGH);

[Jarda]

Hello,

perfect, good job !

BR

Jarda