topic Re: LPC55S6x - Flexcomm clock source in MCUXpresso SDK

LPC55S6x - Flexcomm clock source

jirikerestes — Wed, 17 Jun 2020 10:06:24 GMT

Hello,

I found out that FLEXCOMM_Init() does not initialize Flexcomm clock source (FCCLKSELx), as described in UM11126, Section 32.4, step 2. I did not find any API function to do that either. SDK version is 2.7.0 (included in Zephyr RTOS as a NXP HAL).

Is that a bug, am I missing something, or should the FCCLKSELx register value be set directly?

Re: LPC55S6x - Flexcomm clock source

nxf58474 — Wed, 17 Jun 2020 20:33:49 GMT

Hi jirikerestes,

Hope you are doing well. The function you are looking for is this one:

The parameter you need come from this enumeration, you just need to select the correct value:

For example, if you need to select the 12MHz clock to the Flexcomm4, the function is used like this:

Hope this helps. If you have any further question please let me know.

Best Regards,

Ricardo

Re: LPC55S6x - Flexcomm clock source

jirikerestes — Thu, 18 Jun 2020 07:32:33 GMT

Hi Ricardo,

thanks for clarification! I was searching the code for "FCCLKSEL" and missed that function.

Cheers,

Jiri