How to use both HW SPI & SW SPI at the same time?

[zephyrtr]

I tried to connect two SPI devices(digital compass and optical mouse) to PIC16f877. I reserved the HW pins for digital compass and want to use SW SPI for the optical mouse. I had a confusion with the SPI functions in CCS. There is setup_spi() function and #use spi directive. Can I use both of them in the same program, one for HW one for SW?

[PCM programmer]

I think it should work. Use setup_spi(), spi_write() and spi_read()
for the hardware SPI.

For the software SPI, invoke #use spi() with some other i/o pins.
Then use spi_xfer() to do the transfers.


You didn't give your compiler version. In some earlier versions, it's
possible that #use spi() is a little buggy. Here's an example which
uses hardware SPI, and software SPI, but the software SPI is done
with code, rather than the #use spi() library:
http://www.ccsinfo.com/forum/viewtopic.php?t=26888
You can do that if necessary.

[bkamen]

PCM,

I've done a mix of #use SPI for hardware and software and then just name my streams..

I will concur that success is version sensitive and should be taken with a grain of salt.

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

[andrewg]

The usual thing (to me anyway) would be to use just one SPI bus (typically the hardware one) and then separate CS lines to each device. I presume there must be a reason for wanting separate SPI buses?
_________________
Andrew

[bkamen]

Only in situations where you might want both buses to run at the same time, but if they don't need to, a single bus with mulitple nCS lines is just dandy too.

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

[zephyrtr]

How can I write

setup_spi(SPI_MASTER | SPI_L_TO_H | SPI_CLK_DIV_16)

with #use spi directive?

[PCM programmer]

I think this will work:

[andrewg]

When I've used #use spi, I've not specified the enable pin in the directive, but managed it myself. Otherwise, spi_xfer() becomes complicated to use with multi-byte transfers.
_________________
Andrew

[bkamen]