On 3/21/08, peter green <plugwash@p10link.net> wrote:
> Vasile Surducan wrote:
> > Hi all,
> >
> > On PIC18F2445 USART RX and SPI SDO are shared on the RC7.
> > How would you use that pin without external multiplexing device for a
> > SPI pheripheral and an USART transciever ?
> >
> Unfortunately it looks like the original pin for SDO was taken over by
> the USB functionality so they had to move it.
>
> you could put a series resistor between the USART transciever and the
> pic but doing so would mean you couldn't receive on the USART while
> talking to the SPI device.
>
> Afaict I2C doesn't use SDO, what is the SPI device and is using an I2C
> one instead a reasonable option?
>
> Depending on your perforance requirements big banged SPI may also be an
> option.

I have two SPI, one for the ethernet (deciding to be the hardware one)
and one for the SD card (bitbanged one).
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