topic K21F USB issue in Kinetis Microcontrollers

K21F USB issue

AlvinLin1933 — Mon, 30 Oct 2023 01:24:29 GMT

When use K21F to replace K21D, USB can't communicate with Tablet and the other device, the buzzer and LED function can work, try 5pcs, the issue is the same. would you please advise how to fix it ?

Re: K21F USB issue

Pavel_Hernandez — Mon, 30 Oct 2023 23:02:21 GMT

Hello, my name is Pavel, and I will be supporting your case, could you elaborate further about the communication through USB? Are you using the same bin, or do you have 2 different compile projects?

I say that because the MCU has a different frequency and needs to use the appropriate compilation, 120 MHz vs 50 MHz.

Best regards,
Pavel

Re: K21F USB issue

AlvinLin1933 — Tue, 07 Nov 2023 10:04:14 GMT

Hi Pavel :

After completed the programming, Tablet can't recognize the USB K21F device.

Re: K21F USB issue

Pavel_Hernandez — Wed, 08 Nov 2023 21:57:07 GMT

Hello, sorry for the late response I found on the SDK builder the K21F has an example on the SDK, could you try any example that your similar application, I want to know if the behavior is the same.

The other thing could you elaborate further on the issue?

Best regards,
Pavel

Re: K21F USB issue

AlvinLin1933 — Thu, 09 Nov 2023 00:49:10 GMT

Hi Pavel :

Please refer the enclosed png, when set the USBx_USBTCR0[USBRESET] bit manually, it seems fix the USB issue, would you have the other suggestion ?

Re: K21F USB issue

Pavel_Hernandez — Mon, 13 Nov 2023 20:37:33 GMT

Hello, I found the following thread maybe could help you.

Delay needed before setting USB0_CTL? - NXP Community

Best regards,
Pavel