FTDI Communication with USB device - Objective C

Question

I\'m trying to communicate with the Enttec USB DMX Pro. Mainly receiving DMX.

They released a Visual C++ version here, but I\'m a little stumped on what to do to con

Answer 1

I was running into a similar issue (trying to write to the EntTec Open DMX using Objective-C), without any success. After following @Brad's great answer, I realized that you also need to toggle the BREAK state each time you send a DMX packet.

Here's an example of my loop in some testing code that sends packets with a 20 millisecond delay between frames.

while (1) {

    FT_SetBreakOn(usbRelayPointer);
    FT_SetBreakOff(usbRelayPointer);

    ftdiPortStatus = FT_Write(usbRelayPointer, startCode, 1, &bytesWrittenOrRead);
    ftdiPortStatus = FT_Write(usbRelayPointer, dataBuffer, (DWORD)[command length], &bytesWrittenOrRead);
    usleep(20000);
}

Hope this helps someone else out there!