Re: [Flashforth-devel] FF3.8 MPLABX

[Mikael N. <mik...@pp...>]

On 02/13/2014 12:17 AM, Peter Jacobs wrote:
> I forgot to say that most of the projects are eventually stand alone,
> powered by batteries or plug-pack.  Being able to connect the RS232
> when we want to make an adjustment and then being able to
> disconnect, leaving the device running, is another advantage
> of the old-school-232 connection over the USB connection.
>
> Peter J
Hi,
Actually you can unplug the USB and the PIC still keeps on running.
The USB transceiver is still on so battery consumption could be the issue.

I have been thinking of including a USB sense input option in FF to sense
if the power is coming via USB, but that requires some hardware support.
Then the USB tranceiver could be powered down.

Another alternative could be to power down the USB interface
in warm start if there has been no signals from the USB interface for a 
while.


BR Mikael