[MPC5744P]Problem about ADC trigger mode change

[fyw]

My program execution process is as follows:

s1: ctu0 trigger adc0&1

s2: wait for ctu0 trigger end

s3: disable adc0&1 ctu trigger mode(ADC_0(1).MCR.B.CTUEN=0), and injection start(ADC_0(1).MCR.B.JSTART=1)

s4: wait for injection conversion end

s5: enable adc0&1 ctu trigger mode(ADC_0(1).MCR.B.CTUEN=1), and goto s1

i find after s5, the ctu0 could not trigger adc0&1 any more. i am sure that ctu0 works well(because i can enter the ctu0 trigger out interrupt)

i simple the process like this:

s1: ctu0 trigger adc0&1

s2: wait for ctu0 trigger end

s3: disable adc0 or adc1 ctu trigger mode(ADC_0( or 1).MCR.B.CTUEN=0)

s4: wait for "a period of time"

s5: enable adc0&1 ctu trigger mode(ADC_0(1).MCR.B.CTUEN=1), and goto s1

i find the result depends on "a period of time":

if "a period of time" is short, e.g., for(k=0;k<100;k++); then no err will happen, the ctu will trigger adc0&1 well

if "a period of time" is long,  e.g., for(k=0;k<1000;k++); then the result will be same with the above, the ctu could not trigger adc0&1 any more

i wander what's the problem? Is there any rule if i want to clear and re-Set "MCR.B.CTUEN" ?

Thank you very much!

[fyw]

Problem solved 

do as follows will be ok!  Can anybody explain when disable ADC CTU mode, why need to configure CTU0 first? Thank you very much!

 
pCTU_0->TGSISR.R = 0x000000000;
pCTU_0->CR.B.TGSISR_RE = 1;       
pADC_0->MCR.B.CTUEN =0;            /*disable ADC CTU mode */       
pADC_1->MCR.B.CTUEN =0;            /*disable ADC CTU mode */

-------------------------------------------------------------------------------------------------------

pADC_0->MCR.B.CTUEN = 1;          /* enable ADC CTU mode */   
pADC_1->MCR.B.CTUEN =1;            /*enable ADC CTU mode */         
pCTU_0->TGSISR.R  = ((h_u32)1<< ((CTU0_TRGCH * 2u) + 1u));

pCTU_0->CR.B.TGSISR_RE = 1;

[petervlna]

Hi,

You CTU will continue to request ADC conversions while is enabled.

Always disable triggers first. If it is DMA, ADC, or any other HW triggered periphery.

Peter

[petervlna · Accepted solution]

Hi,

Do you also disable to CTU triggers to ADC?

Or just change ADC mode to software?

Peter