topic Re: How to configure DEC in MPC5xxx

How to configure DEC

xiaofangu — Sun, 06 May 2018 10:46:13 GMT

Hello,

I need to use DEC in S32DS.Power.2017.r1.And I have configured it.

First time,it can run into DECisr()function,the related registers is look like:

and in the DECisr function,I clear the DIS flag:

__asm("e_lis %0, 0x0800\n\t"
"mttsr %0\n\t"
:"=r" (regi0));//if it is right

but,it seem not to clear DIS bit,and it is still 1.And then，the program can run back to main function successfully,and it cannot run into DECisr() anymore.

so,what's wrong with my progress?

Re: How to configure DEC

xiaofangu — Wed, 09 May 2018 03:25:35 GMT

Sorry,I forgot to mention that the MCU is MPC5634m

Re: How to configure DEC

xiaofangu — Fri, 11 May 2018 08:59:06 GMT

I'm sorry,Its a silly question,Because the MSR[EE] is 0, so it cannot trigger interrupt.But Why MSR[EE] cleared unexpected?

Re: How to configure DEC

davidtosenovjan — Wed, 23 May 2018 08:52:11 GMT

Him it is because EE affects External input (i.e. interrupt controller), decrementer, and fixed-interval timer. See MSR description below from core reference manual: