Device ID

Adam Haile edited this page Aug 21, 2017 · 8 revisions

USB Serial devices like the AllPixel (which uses the ATMega32u4) don't typically have unique serial numbers programmed into the device. Because of this, there is no guarantee what COM port name the device will be assigned when using multiple devices. Even if the devices are left plugged in, a system reboot can completely re-assign the port names, depending on the order in which the devices were enumerated.

This was problematic when using multiple devices like the AllPixel with BiblioPixel's Multiple Driver Support. Each serial device connects to a specific region of a display so BiblioPixel, therefore, must know which port name corresponds to which device without having to reconfigure the drivers after each system boot. This is where device IDs come in.

Serial now includes an optional parameter that allows specifying a unique 8-bit device ID, making it possible to differentiate between 256 different devices. But first, the IDs must be set. To do so, check out the instructions for the Serial Device Commands.

Once you have set the device IDs, simply provide it to Serial in the init parameters:

driver0 = Serial(LEDTYPE.NEOPIXEL, 100, device_id = 0)
driver1 = Serial(LEDTYPE.NEOPIXEL, 100, device_id = 1)
driver2 = Serial(LEDTYPE.NEOPIXEL, 100, device_id = 2)
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