Re: [avr-chat] AVR and accelerometers

[Wouter van Gulik]

> Would electrically isolating the SPI bus from the MCU during
> programming be possible/help solve the problem? I was thinking a
> tristate bus which is controlled by the reset pin of the SPI
> programming interface should be able to do just that, although with
> the addition of another IC on the board and on the bus lines, which
> also means the IC would have to respond fast enough to the SPI data
> signals when the SPI signals are going through it.
> 

Is not much simpler to use the UART in SPI mode? Most newer AVR's can. This
solves the whole problem. You should check the USB devices to see if there
uart is SPI capable.

HTH,

Wouter