any shift register(74hc595) example code for nRF52?

[FormerMember]

Hello!

I'm trying to nRF52 soc chip to drive the matrix sensors array (16x16), because there is no enough I/O pins for my project and thinking of use the shift register (74HC595) to drive multiple pins.

Does anyone know how to get the shift register (74HC595) to work on nRF52 or is there have any example code about shift register for nRF51/2?

Thanks.

[bjorn-spockeli]

I am afraid that we do not have any code specific to the 74HC595, but you should be able to use the nRF52s SPI peripheral to clock data in to the 74HC595. I suggest that you take a look at the SPI Master example in the SDK.

In order to clock data into the 74HC595 using the SPI of the nRF52 you have to connect the following pins

74HC595   nRF52
 SRCLK --> SCK 
 SER   --> MOSI
 RCLK  --> SS

Best regards

Bjørn

[FormerMember]

@Bjørn If we connect the RCLK and SRCLK together, then the shift register will always be one clock pulse ahead of the storage registe clock. If this is the case, do we still need the SS pin for the SPI on nRF52?