// lab3_skel.c 
// Name:     
// 10.30.2023
//
//Just like lab2 but with interrupts
//
//  HARDWARE SETUP:
//  PORT C physical connections 
//                       PORTC:  7 6 5 4 3 2 1 0
//             pwm_enable_n    --| | | | | | | |--unused 
//             digit select MSB----| | | | | |----unused 
//             digit select    ------| | | |------unused 
//             digit select LSB--------| |--------unused 
//
//Lower nibble of PORTC are to be left unused. Terminate 3-to-8 decoder
//inputs with protoboard connections.

#include <avr/io.h>
#include <avr/???????????>

#define TRUE 1
#define FALSE 0

//*****************************************************************************
void init_TC0_normal(){
//setup timer for normal mode and overflow interrupt
//
TCC0_CTRLA |= TC_CLKSEL_DIV4_gc; //~440uS
TCC0_CTRLB |= TC_WGMODE_NORMAL_gc;
TCC0_PER    = 0x00F0; 
TCC0_INTCTRLA = ?????????????????; //interrupt level bit zero set
}
//*****************************************************************************


//*****************************************************************************
                            TC0 overflow ISR
//
ISR(TCC0_OVF_vect){ 
//most all of your old code goes here
}//end of ISR

//***********************************************************************************
int main(){

  //configure all PORT A pins as WIREDANDPULL OPC[2:0]=111
  PORTCFG.MPCMASK = 0xFF; //write all the bits
  PORTA.PIN0CTRL = PORT_OPC_WIREDANDPULL_gc; //set output pull control 

  //Port C upper nibble is all outputs
  PORTCFG.MPCMASK = 0xF0; //write upper nibble 
  PORTC.PIN4CTRL = PORT_OPC_TOTEM_gc; //set output pull control 

  init_TC0_normal(); //TC0 running in normal mode

  PMIC.CTRL ??????????????????; //enable low level interrupts 
  sei();

  //main while loop
  while(1){
    //bound the count 
    //break up disp_value to 4, BCD digits in array
  } //while
}  //main