One function instead of two state in C

Normally the code I wrote is working. But I want to write with a more regular and more professional language. Aim of code is after buzzer first ringing, buzzer every 2 seconds ringing at the same time button checked by processor. Code like this;

timer = HAL_GetTick();
timer++;
if(timer==1000){            
 playTone=1;
}
if(timer==3000){
   playTone=1;
}
if(timer==5000){
    playTone=1;
}
if(timer==7000){
    playTone=1;
}

if(2000> timer && timer > 0  && (HAL_GPIO_ReadPin(But_Prog_GPIO_Port,But_Prog_Pin)== 1)){
    //Do something_1
    __HAL_GPIO_EXTI_CLEAR_FLAG(But_Prog_Pin);
}
else if( 4000> prog_button_timer && prog_button_timer >= 2000&& (HAL_GPIO_ReadPin(But_Prog_GPIO_Port,But_Prog_Pin)== 1)){
    //Do something_2
    __HAL_GPIO_EXTI_CLEAR_FLAG(But_Prog_Pin);
}
else if( 6000>prog_button_timer && prog_button_timer > 4000&& (HAL_GPIO_ReadPin(But_Prog_GPIO_Port,But_Prog_Pin)== 1)){
    //Do something_3
    __HAL_GPIO_EXTI_CLEAR_FLAG(But_Prog_Pin);
}   
else if( 8000>prog_button_timer && prog_button_timer > 6000&& (HAL_GPIO_ReadPin(But_Prog_GPIO_Port,But_Prog_Pin)== 1)){
        //Do something_3
        __HAL_GPIO_EXTI_CLEAR_FLAG(But_Prog_Pin);
    }       
else
  //Do something