S32K144UFT PDB to Trigger ADC

[佳豪殷]

Hi,

         when i use software to trigger ADC1 channel a ,the result in Ra is 0x0804. But, when i use PDB1 to trigger ADC1,the in Ra is changed to 0x0878.  Other  configuration  is all the same. I sample a voltage  from  2.5V reference source.

         how can i find the problem?

[danielmartynek]

Hi,

There is no reason why it would be different.

I have tested both triggers on ADC1 channel A and the result are identical.

Regards,

Daniel

[佳豪殷]

Thank you for you reply!

         It has been resolved .the reason  is from Self-Calibration mode.

         Before,  i do like this. Step one,  select hardware trigger mode. Step two, run Self-Calibration. Step three, use PDB to trigger  ADC1.then Ra is different.

         Now, i do like this. Step one,  select software trigger mode. Step two, run Self-Calibration. Step three, select hardware trigger mode .Step four, use PDB to trigger  ADC1.Then, Ra is identical.