2387043_en-US

Yes

PDB ADC pre trigger sequence error recovery

Hi NXP community,

ADC0/ADC1 Interrupts Stop After Runtime Flash Erase/Program Operation on S32K144

As a continuation of my previous question, I need some clarification on how to properly recover from a PDB ADC pre-trigger sequence error on the S32K144.

I tried the following three methods, but only one of them worked correctly.

Method 1 (working):

Stop PDB0 and PDB1 before performing the flash erase/program operation.
After the flash operation is complete, restart both PDBs and re-enable the corresponding ISRs.

With this approach, no PDB sequence error occurs.

Method 2:

After the flash erase/program operation was completed, I stopped and restarted PDB0 and PDB1. However, a PDB pre-trigger sequence error occurred. I then attempted to recover by stopping and restarting the PDB modules again, but the sequence error persisted.

Method 3:

Method 3 (Not Working):

I did not stop or restart PDB0 and PDB1 during the flash erase/program operation. Instead, after the operation completed, one pending PDB ISR and ADC ISR were triggered.

Inside the PDB ISR, I attempted to clear the sequence error flag using:

PDB0->CH[0].S &= (uint32_t)(~PDB_S_ERR_MASK);

The corresponding ADC ISR was then executed, and reading the ADC result register cleared the COCO flag. I expected this to prevent further pre-trigger sequence errors, but the issue still persisted and this method did not work.

My question is: once a PDB pre-trigger sequence error has been triggered, is it possible to recover the PDB/ADC operation and resume normal triggering without resetting the system? Or does the PDB need to be stopped and restarted beforehand to avoid entering an unrecoverable state?