Hi Gabriel,

DMX512 uses a 1 start bit, 8 data bits and 2 stop bit format, which you can implement using the uart in mode 2 or 3. Basically you can use the uart "normally" but set the TB8 bit prior to loading SBUF when sending. TB8 will be your first stop bit.

Read the tutorials here for explanations of timers, uart and interrupts. The code library here has some serial code as well.

Dennis