SPI for STM32WLE5

[kennyhuang19]

I am using SPI example file DigitalPotControl.ino,

// SPI definitions
#ifndef PIN_SPI_SS
#define PIN_SPI_SS PA4
#endif
#ifndef PIN_SPI_MOSI
#define PIN_SPI_MOSI PA7
#endif
#ifndef PIN_SPI_MISO
#define PIN_SPI_MISO PA6
#endif
#ifndef PIN_SPI_SCK
#define PIN_SPI_SCK PA5
#endif

it can not work.
I check its waveform on scope, CS on PA4 work well, but can not find Clock on PA5.

Is there anything wrong for my setting?

Thanks for your help in advance.