What does QDEC UART/SPI/TW in nRF5340 product brief mean?

[Jacob Lee]

Hi,

In our project, we have configured 2 TWI (for sensors) and 2 UART(RS485 and debug conole)  respectively.

But we still need one more uart to implement a feature.

We found there is a description in the section "digital interfaces" of nRF5340 product brief

"2xQDEC
UART/SPI/TWI"

Does it mean we can use QDEC to implement UART function?

If yes, is there any example for that?

thanks,

Jacob

[Naeem Maroof]

Hello,

Thank you for contacting DevZone at NordicSemi.

Looking at the Product Specification of NRF5340, we have upto 4x I2C and 4x UART instances available

However, as several of the instances share the same ID, only one of them could be used / activated at a time. Please see the table in the Product Specification document for completeness.

we have configured 2 TWI (for sensors)

You can put two or more sensors on the same I2C controller interface.

Which SDK you are using by the way? In NCS, that would be done in an overlay.

Regards, Naeem

[Jacob Lee]

Hi Naeem,

I found there are more UART/TWI interfaces listed in the nRF5340-SoC-Product-brief

So I got confused about this.

Anyway, I am trying to switch uart pins runtime so that one uart is shared  for two components.

Thanks for reply.

[Naeem Maroof]

QDEC (Quadrature Decoder) is a different digital interface, and is not an alternate for SPI or I2C.

The Quadrature decoder provides buffered decoding of quadrature-encoded sensor signals. It is suitable for mechanical and optical sensors. Please see QDEC from the product specification for more information.

/BR, Naeem