@myke_predko wrote:It may not feel like it but you're on the right track. While you probably want to use PEE in your application, I suggest that you work up to it.
Personally, I would start with the goal of getting the crystal running - don't worry about the PLL just yet.
What happens if you select "PBE"? You should be able to get the crystal running and then work on the PLL to get your application running at speed.
I know the clock wizard is cranky and there's no adequate documentation for using it - I have spent a lot of time clicking at things and then going back to the reference manual to try and figure out what's happening and how I want to get to where I'm going.
Let us know how you are making out on getting the crystal running and then, give us screen shots of the clock wizard so we can see where the problems lie.
Thank you for the tips, it does look better already but seem not to be able to resolve the Core clock issue. How it looks so far:
There, I've got a configuration without errors now but with PEE:
BOOM: Yeps, I was able to confirm that after I clkicked on Update Code, the function BOOT_InitBootClocks() now returns fine! Yay!
Only thing is, is it a problem that I'm using the internal 48MHz oscillator instead of the 12MHz system oscillator?
@myke_predko wrote:Sorry, just saw this now - I replied directly to your reply to me but didn't read through the whole thread.
You're asking if it's a problem that you're running the Internal 48 MHz Oscillator instead of the external 12 MHz. That depends on your application, if you're going to use the Kinetis for anything that requires a precision clock (USB & Ethernet being big ones and you may have issues with the UART).
If you aren't using any of these peripherals, then you can delete the 12 MHz crystal and use the two pins for IO.
Personally, I would recommend getting the crystal working. Maybe you don't need it now...
Yes, I'll need the crysral working because I'm going to be using this for CAN which needs precision timing.
I have now changed the OSCSEL to the 12MHz oscillator, deactivated the PLL, changed the PLLS to FLL but can't seem to get the numbers right for the Core clock. Do you have any further hints? What I have now looks like:
e we go:
PLL = /4*40:
I think this should/could/would do the trick, shouldn't it?
@myke_predko wrote:Yes, that's more in line with what I'm looking for.
Let me know how it works on the part.
myke
No,
This actually isn't good, the code gets stuck in BOARD_InitBootClocks(); at
/* Wait for CLKST clock status bits to show clock source is ext ref clk */
while ((MCG->S & (MCG_S_IREFST_MASK | MCG_S_CLKST_MASK)) !=
(MCG_S_IREFST(kMCG_FllSrcExternal) | MCG_S_CLKST(kMCG_ClkOutStatExt)))
{
}
What am I missing?
So yes, I tried OPBE now and I've got this:
As for the clocks table, it looks like:
One little thing that I realized is, Core clkock was at 120MHz with a little padlock and showed an error, I then double clicked on it in the clocks table, which removed the error (and padlock)and it then changed to 12MHz.
So with the above setup, it still gets stuck at
/* Wait for CLKST clock status bits to show clock source is ext ref clk */
while ((MCG->S & (MCG_S_IREFST_MASK | MCG_S_CLKST_MASK)) !=
(MCG_S_IREFST(kMCG_FllSrcExternal) | MCG_S_CLKST(kMCG_ClkOutStatExt)))
{
}
