TI 280x ePWM Trip Zone

Hi! My question is related with the Real Time Workshop in combination with Texas Instruments processors. I want to configure an ePWM Trip Zone in order to force ePWM1-3 to 'Low' state as soon as I receive a pulse on pin TZ1 (one-shot Trip Zone). So far, this works quite well, but how do I reset the Trip Zone after the error is gone, so the PWM is active again? Do I have to write my own ISR? How can this be done in Simulink? (because my code is generated by RTW) Thanks! David

[David]

just want to add that this is quite important for my diploma thesis as I cannot connect to the frequency converter without this security feature...

[tcagdas]

hi can you explain how to use tripzone in simulink?

Answer 1

[David]

All right, as nobody added answer to this question, I can only post my solution, but I don't know if it is the way it should be done: I wrote a standard C-source file and compiled it as a simulink block.

void clear_TRIP(void)
{
  EALLOW; // Allow writing to protected registers

  EPwm2Regs.TZCLR.all = 7;
  EPwm3Regs.TZCLR.all = 7;
  EPwm4Regs.TZCLR.all = 7;

  EDIS;   // Lock registers against writing
}

As the macros EALLOW i.e. refer to assembler commands, I did a tlc function replacement on these commands in order to get the final code right in the CCS project. The simulink version of the code just does 'nothing'.