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OSX + Mono + Netduino USB COM port


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#1 nimble

nimble

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Posted 29 July 2012 - 10:31 PM

I am putting together a Netduino device, which I want to connect to my mac mini, and control it from the mac using Mono. So, the parts involved are 1. Netduino (of course) 2. OSX 3. USB Host <-> USB Netduino 4. serial COM port over USB I have never done this before, and I have been reading about difficulty getting this sort of thing to work in Windows, so I am wondering if this is even possible on a Mac? My main concern, is that when I switch the Netduino to do debugging over RS-232 (leaving the USB free for data), this requires a HID driver on the host operating system that will support virtual COM ports? Is this correct? My concern is that this driver might not be available on OSX - I have no idea, but I thought I would ask the question - this is probably really obvious to somebody here. To help my understanding, can someone point me to a link explaining what actually happens when configuring a Netduino to use the USB for data transfer? I am expecting something like this: 1. Netduino is toggled to start up USB HID Virtual COM port driver on firmware reboot - hopefully you have connected RS-232 pins to PC so you can still debug the device... 2. Connect Netduino USB to PC - this powers on the netduino and boots it, which starts the HID driver firmware. PC now detects the Netduino as an HID device 3. PC queries Netduino for HID capabilities, Netduino responds with 'Virtual COM port' 4. PC pops up the obligatory 'do you want to install this device' dialog box - and Windows already has a driver for this device type? The driver is happily installed. 5. PC creates a COM port number (i.e. COM8, COM9, COM10 etc) to represent this device 6. In your C# code, you can now open 'COM8' (or whatever) and it opens a channel directly to the netduino. If the netduino is running code listening on its own COM port (I assume it would probably be 'COM1' on the device) then a channel is achieved. Thanks guys and gals. Adam




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