Attempting to Set up an ISR Function

Official Hardware Portenta Family Portenta H7
1

I'm trying to figure out how to make a timer call a function (I'm trying to do this without a library for the sake of getting familiar with the datasheet and microcontroller), I have this (part from datasheet, with attempted fixes from other sources), but it doesn't seem to work. Anyone know where I'm going wrong? Thanks for any help:)

#include <Arduino.h>
#define REG_SET_BIT(reg,index) ((reg)|=(1<<index))
#define REG_CLEAR_BIT(reg,index) ((reg)&=~(1<<index))

bool isLEDoff=true;

void setup()
{
  pinMode(PIN_LED,OUTPUT);
  digitalWrite(PIN_LED,isLEDoff);

  REG_SET_BIT(RCC->APB1LENR,RCC_APB1LENR_TIM2EN); //Enable TIM2 clock

  //240,000,000/24,000=10,000 Counts for 1 Second
  TIM2->PSC=24000-1; //Set prescaller
  TIM2->ARR=10000-1; //Set count value

  REG_SET_BIT(TIM2->EGR,TIM_EGR_UG);

  //Enable TIM2 interrupt handler in NVIC
  NVIC_EnableIRQ(TIM2_IRQn);
  NVIC_SetPriority(TIM2_IRQn,0);

  REG_CLEAR_BIT(TIM2->SR,TIM_SR_UIF); //Clear Status Register (seems to not continue w/o this)

  REG_SET_BIT(TIM2->DIER,TIM_DIER_UIE); //Enable interrupt

  REG_SET_BIT(TIM2->CR1,TIM_CR1_CEN); //Enable Timer
}

void loop()
{

}

void TIM2_IRQHandler(void)
{
  REG_CLEAR_BIT(TIM2->SR,TIM_SR_UIF);
  isLEDoff^=true;
  digitalWrite(PIN_LED,isLEDoff);
}
2

.... but you could to use the library as a code example.

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