i tried to convert a analog signal to a digital one,using LED7SEG to show it ,but after adding the timer8 ,the system just don't work ,can you help?

this is my code ,thank you !

#include <m8c.h>        // part specific constants and macros
#include "PSoCAPI.h"    // PSoC API definitions for all User Modules
#pragma interrupt_handler timer
int TimerCount=0;
int iResult;
int i;

void main()
{
   
    M8C_EnableGInt;
    PGA_1_Start(PGA_1_MEDPOWER);
    ADCINC12_1_Start(ADCINC12_1_MEDPOWER);
    ADCINC12_1_GetSamples(0);
    Timer8_1_Start();
    Timer8_1_EnableInt();
 
 
    LED7SEG_1_Start();
   
    while(1)
    {
     if(ADCINC12_1_fIsDataAvailable()!=0)
     {
      iResult=ADCINC12_1_iGetData()+2048;
      ADCINC12_1_ClearFlag();
      iResult=iResult*5000.0/4096.0;
      
      LED7SEG_1_DispInt(i,1,4);
      
      if(iResult>2000)
      {
       PWM8_1_Start();
      }
      
      if(iResult<=2000)
      {
       PWM8_1_Stop();
      }
     }
    }// Insert your main routine code here.
}

 void timer()
 {
  TimerCount+=1;
  if(TimerCount==128)
   {
   i=iResult;
   TimerCount=0;
   }
 }

Can you let us know about your hardware setup. Are you using a Cypress Development kit for development or any custom board. Can you as well let us know which device you are trying to use.