Serial mezzanine with management for host to one or many targets.Designed by ron-sutherland, Ships from United States of America
What is it? A mezzanine board that plugs into one of my programmable boards (RPUno) and connects it to a managed multidrop serial (RPUbus). Wired with CAT5. Why did you make it? To tinker with mul...Read More…
To tinker with multidrop serial using cables I can afford and crimp myself, but it has grown into a little more.
Basically, the RPUadpt serial can be configured as a point to point (e.g. host to bootloader) or point to multipoint (e.g. host to multidrop) with I2C commands from either a connected SBC host or the RPU controller board it is mounted on. An SBC with I2C/SMBus can then compile the source code and bootload an RPUno selected with the I2C commands without exposing any upload interfaces on the network. The uplink to the internet can be intermittent (or down) while doing the software updates and debugging if the developer is at the local network.
Update: ^6 adds IOFF buffers to the UART that allows the host to power off without locking up the rpubus (i.e. another host can use the serial). SPI interface has host interface with IOFF buffers and CS (to nSS). 328pb adds a second I2C port so the SBC host can use it with SMBus, and when the host is powered down it will not block the RPUno from using its I2C.
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United States Postal Service: Priority Mail
Priority Mail Small Flat Rate Box will hold two RPUno, or two shields (RPUftdi or RPUadpt) and an RPUno.
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I am working on what may be thought of as a SCADA system for the garden and workshop. I prefer WiFi to be on the SBC (Pi Zero) or host computer that I can then connect to a multi-drop serial for interfacing the somewhat industrialized microcontrollers. To bootload, I have set up the multi-drop serial so it has a full duplex connection between the host and microcontroller and a half-duplex connection that can manage what is (or is not) connected to the full-duplex bus. This is done with a specific favor (Intersil) of RS-485 transceivers.