I have a one channel ADC with MISO/CLK/CS lines only. If I only bring the CS
down in order to initiate a conversion, I get nothing
On the other hand, if I just send a command to the transmission register (as I
usually do with multiple channel ADCs (these have a standard interface)), I
still get nothing.
The SPI interface works great when operated in 4-wire mode.
R.
--- In "Russell N. Nelson - rnnelson" <>
wrote:
>
> I'm confused by your confusion. If you can ignore the MOSI line, that means
> that the slave doesn't care what it gets on its input, and you can just
> ground it so it clocks in zeroes. Think of SPI as a shift register with an
> enable input (/CS). Whatever you give the inputs (MOSI and MISO) is what gets
> clocked into the shift register. After 8 or 16 clocks, you have whatever
> you've clocked in.
>
> ________________________________________
> From: on behalf of
> razvan_ionut_stoian
> Sent: Monday, December 06, 2010 10:05 AM
> To:
> Subject: [ts-7000] Standard SPI vs. 3 wire SPI
>
> Hi.
>
> Does anybody know how to modify (hardware and software) a typical SPI
> interface (CLK/MOSI/MISO/CS) into a 3-wire SPI (no MOSI line)?
>
> In order to receive a word from the slave, one has to send a dummy command
> from master to slave. Since there is no MOSI line, how can the serialization
> of the received data be possible?
>
> Thank you,
> R
>
>
>
> ------------------------------------
>
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