RE: Fast Track to Arduino Programming - Lesson 1, Reading from the Serial Port

beacon_dave — Sat, 02 Jul 2016 12:46:38 GMT

Perhaps one for a future lesson consideration, however have you ever done anything with the DMX 512 lighting protocol with the Arduino serial port ? There appear to be a number of workarounds for it on the net each claiming to be the right way but just wondering what your approach/opinion would be ?

First issue is the 250000 baud, no parity and 2 stop bits which appears to require a workaround by setting up the USART registers directly.

Second issue is the >88us long reset break prior to the start of data transmission which appears to require a workaround of temporarily changing the USART baud rate from 250000 baud down to 115200 baud, outputting a low, then changing the USART baud rate back to 250000 baud before sending the rest of the data >8us later.

Arduino Playground - DMXSerial

A Arduino Library for sending and receiving DMX