Question regarding SX/B SHIFTOUT command

Paul Baker

The docs for SHIFTOUT show the ability for SPI modes 1 and 3 (data changed on rising and falling edge of clock), but I cant figure out how to specify it. The SHIFTIN has the PRE and POST suffixes, but SHIFTOUT only seems to have the bit ordering, am I missing something?

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
·1+1=10

Jon Williams

Before using SHIFTOUT set the clock pin to opposite state; so if you want use a falling edge, make the clock line high before the call.· I'll add a bit of text in that regard to the helpf file.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Jon Williams
Applications Engineer, Parallax

Paul Baker

Thanks I understand what the picture with the two clocks is showing now.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
·1+1=10

John Couture

Paul,

Your signature line reminds me of a joke:

There are THREE types of people in the world, those that can count and those that can't!

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
John J. Couture

San Diego Miramar College