AnsweredAssumed Answered

Different freedom board issue

Question asked by seanwu on Apr 8, 2013
Latest reply on Apr 9, 2013 by seanwu

Dear Sir,


   I have two freedom boards. The chip number one is MKL25Z128VLK4_0N97F, and the other is MKL25Z128FRDM_1N97F.

I am not sure what the difference is between with them. Because I tried the hid_keyboard example in Freescale USB Stack v4.0.3,

using MKL25Z128VLK4_0N97F, the HID keyboard device could show in my PC, but using MKL25Z128FRDM_1N97F could not.



I found it always in the loop

    while((MCG_S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */



It seems to mean that MKL25Z128FRDM_1N97F doesn't select external reference clock.

IREFST bit in MCG Status Register (MCG_S) is not 0, and CLKST bits is not 10.


But MKL25Z128VLK4_0N97F is normal.


Could you please help me to resolve this issue?