Add Support for Multiple CDC Drivers #722
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Old code would just return after setting up the first driver. I removed that and had to update the CDC driver to have its own is_ready flag. There is a global ready flag in core/usb.zig but when you have multiple devices, if you connect to one cdc device and try writing to the disconnected one, it stalls out because that is_ready flag is set true.
I've tested this updated code on the RP2350B for reading/writing data to both drivers without any issues.