*****.

Hi,

Would you please also provide the screenshots of the relevant Timer Sysconfig configuration?

Best Regards,
Peter

>  if((TIMER_0_INST->CPU_INT.RIS) & GPTIMER_GEN_EVENT0_IMASK_TOV_MASK){

TOV is Trigger OVerflow (event generation) so it isn't what you're looking for. You probably want either the Load or Zero event [Ref TRM (SLAU846B) Fig 27-10], something like:

>  if((TIMER_0_INST->CPU_INT.RIS) & GPTIMER_CPU_INT_RIS_Z_MASK){       // Zero Event?