This article is going to tell you how to configure
for SPI interface. For the details, please refer to section 3.6 <spi> in <<WF121 CONFIGURATION USER GUIDE>>
The CKP and CKE are used to determine on which edge of the clock data transmission occurs. The following diagrams illustrate the details:
Note: Two SPI Clock modes are shown here only to demonstrate the functionality of CKP and CKE. Any combination of CKP and CKE can be chosen for module operation.