Communication hangup with EOP300 programmer - long waiting time
July 18, 2011
This article applies to:
EOPX, EOP300 Programmer
We use Enocean's Dolphin Studio and the EOP programmer to load our firmware into the modules. We have found that a bad connection can lock the programmer up, requiring us to unplug the USB cable and waiting for a period of time before the software/driver/programmer resets and is usable again. In addition, Dolphin Studio has a long timeout of about one minute before it resets on a bad read or write.
A user configurable timeout on Dolphin Studio (2 seconds to 60 seconds) would be useful
A more graceful recovery from bad communications would also be desirable. It seems that the USB driver may get hung up and not properly reset.
This is a limitation of the FTDI chip and MPSSE stack and there is no other possibility of implementation. If there is a communication problem EOPX tries to reset the whole USB stack through the FTDI driver. It is the same effect like unplugging the USB cable. This can take upto 2-5 seconds dependent on the type of operating system, USB controller, etc.
We work with EOPX in production where we produce several thousand of modules per day but we ensure a good contacting of the modules.
Another possibility is implementing an own programmer through a host controller using the SPI protocol. Some customers have already realized this using an FPGA or other micro-controller.
Read the related application note AN502 how to do this.
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