suggestion on how to implement duel /quad spi interface

[longpole001]

yes no mater what shiftin/shiftout will get in/ out 1-8 bits per command and i cant see how to make it shift out /in more than 1 data pin synchronously ???

[HenrikOlsson]

Hi Sheldon,
You can't do that with SHIFTIN/SHIFTOUT (without modifying the underlaying ASM routines of course (don't do that)).
You need to write the routines yourself, shouldn't be that hard to do I don't think. But, as Richard points out, using the MSSP module in SPI mode will probably give you equal (or better) performance compared to a bitbanged dual SPI setup.

/Henrik.

[richard]

just to make things clear shiftin/shiftout will get in/ out 1-8 bits per command is just wrong .
shiftin/shiftout can process however many bits you require for as many vars as specified in the command (even 32 bit longs) but always 1 bit at a time