LAUNCHXL-F280025C: PLL reference clock lost detection

Hi Ushma,

Yes it is possible.

Best Regards,

Nirav

Hello Nirav,

Could you tell me how to do the test for it ?

maybe any sample example .

Thanks 

Ushma cholera

Hi Ushma,

We do not have sample example in C2000Ware at this point, but we plan to add it in future. You can reference below example which uses MCD to detect a failure, you will have to modify it based on the steps listed in the TRM to use PLL Ref. Clock lost circuit.

C:\ti\c2000\C2000Ware_3_04_00_00\driverlib\f28002x\examples\sysctl\sysctl_ex1_missing_clock_detection.c

Best Regards,

Nirav

hello Nirav , 

i followed the steps what i dotn get is this function:

SysCtl_disconnectMCDClockSource();  set the OSCOFF(to falsely inject the error) but it is for MCD module , how to do this in the above mentioned case

in TRM this part doesnt show how to inject the error

Thanks 

SysCtl_disconnectMCDClockSource() function disconnects OSCCLK from MCD, but this OSCCLK also goes to PLL and other places. So in order to simulate fail condition instead of physically grounding the clock, in this example it disconnects / turns off the clock.

If you are physically going to ground the clock source than you dont need to execute this function.

Best Regards,

Nirav

Hello Nirav, 

I have tried with this MCD module and it gives me NMI Interrupt then i have disable MCD and enable PLL refrence clock loss detection and then used this OSCOFF it doesnt give NMI Interrupt , it alos says here that connect and disconnect  to MCD module , it looks like it is specific to MCD module .

Can you please try this :

OSCOFF bit to set and try with PLL refrence clock loss detction and MCD off it doesnt give NMI interrupt 

If you are using OSCCLK=INTOSC2/XTAL, you do not need to disable MCD.

Why do you need to set OSCOFF bit?

Best Regards,

Nirav

Hello Nirav , 

yes i am using INTOSC2 and  i am using the secod option to detect the complete loss of clock.

and i followed this steps to configure it

Now i want to test if this works so  to test i want your suggestion as setting this bit OSCOFF doesnt not help .

could you please let me know how can i physically ground the clock or set other bit to test this configuration .

Thanks