CC3351: crystal oscillator frequency calibration and WIFI frequency calibration

Hello,

Can you share some information about your setup? Are you using the CC3351 in a hosted setup with a MPU running Linux? Or MCU with RTOS?

Or are you testing RF in a standalone setup using our RF testing tool Radio Tool?

In both hosted situations the Wi-Fi calibration is automatic, occurring every connection and every few minutes. 

If you have a problem specifically with frequency accuracy, perhaps you need to change the load capacitors on your XTAL, see this app note for information on how to tune the frequency accuracy: https://www.ti.com/lit/an/swra680/swra680.pdf

Regards,

Jonathan 

The customer use CC3351+MPU, For Linux systems, it is generally thought that WIFI frequency calibration is achieved by adjusting the internal offset or other configuration parameters of the chip based on the test results during WIFI testing. So our CC3351 do not need any other configuration and it will calibrate automatically to achieve 2ppM, is it right?

Add one more question:

The customer refer to the official guidance document to adapt to the MPU NXP imx91. they see that the document requires these two patch files, as follows

After installing the driver installation program "cc33xx-linux-package-1.0.0.7-lux-x64-installer", What patches should they use to modify the kernel for adaptation to NXP imx91.

So there is no frequency offset register in CC3351, or other similar function register? Is it right?