MISO not updated on falling edge of CS when CPHA=1

[zeidph]

When using the shift() function MISO data is not shifted on the falling edge of CS. Its only shifted on the first edge SCLK.

[schang412]

The _shift function is a utility function. If you want to read some data on the falling edge of CS, you will need to implement the behavior yourself. Please refer to the slave examples provided to see how this is done.