cDMXdriver

Driver to use a serial port on linux to output a dmx-signal

About

Hardware

Use the TX pin of your serial port or usb to serial adapter (e.g. CP2102 or FT232RL) as a input for a RS485 transmitter (e.g.MAX485). Connect the output of the RS485 transmitter to your DMX device.

example for MAX485:

Pin 3, 8 at Vcc = 5V
Pin 2, 8 at GND
Pin 1 over 120Ohm at GND
Pin 4 TX as input signal
Pin 6 as DMX HOT (+)
Pin 7 as DMX COLD (-)

Functions

struct dmxPort: A struct in which all important data is stored. It is stored in shared memory.
initDMXPort(port): The function to generate a dmxPort struct (as shared memory). It configures the serial port, initializes the variables and returns a pointer to the generated dmx Port. The parameter specifies the port e.g. "/dev/ttyUSB0".
setMaxDMXChannel(dmx, maxChannel): Set the highest send DMX channel. You should use this to get a higher output frequency cf. img/.
setDMXChannel(dmx, channel, value): Set a channel (1-512) to a value (0-255).
getDMXChannel(dmx, channel): Get a channel (1-512).
getDMXOutputPointer(dmx): Get a pointer to the output array. Channels from 0 to 511.
startDMXOutput(dmx): Start sending the dmx signal (makes a fork and call 'dmxThreadFunction').
stopDMXOutput(dmx): Stops the active output.
closeDMXPort(dmx): Stops sending signals and closes the serial port.

Notes

I used a CP2102 USB to TTL adapter with MAX485 to test the software successfully.
Look in the img folder for oszi images.
There are some ohter usefull functions. Take a look at cDMXdriver.h.

License

robotlem/cDMXdriver

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