2 SPI MODES

Guest · Posted: Thu Feb 26, 2009 6:10 pm

In future project I want to interface with two diffferent SPI devices. I was looking at their data sheets and found that one device is mode 1 and the other is mode 3. So I would like some feedback on the way to deal with this issue. Use a chip with two spi lines or setup the spi each time I want use each sensor?

Any Ideas?

asmallri · Joined: 12 Aug 2004 Posts: 1635 Location: Perth, Australia

If you do not need to access both devices concurrently then you can use a single SPI bus to do this. It just means you need to initialize the SPI as part of the process for selecting each device.

The process for all PICs is deselect all devices, stop the SPI bus, change the SPI configuration, clear the SPI interrupt flag, enable the SPI bus, select the sensor, communicate with the sensor....
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