ESP8266 Interrupters timer

Projects Programming
7

Ok,
I want to document this madness for anyone that tries to venture down this same path. After some more playing with the timers, it looks like I made a mistake assuming that the timer had overflowed. It was my unsigned long that had overflowed. As I have heard it said if you assume something, you'll make yourself look like the first three letters of assume.

Anyway, the code I used to test this is below but it looks like the timer1 is at least 8 bytes. My uint64_t overflow there also, and I get an error with uint128_t. So I can't go any bigger. I suppose there is a way to go bigger but I'm not aware of how. If anyone knows I would be interested.

uint64_t cycle_time = 0; 
int last_bytte = -1; 

void cycle_I()
{
  noInterrupts();

  int bytte = 0; 
  uint64_t current_cycle = cycle_time; 
  cycle_time = cycle_time << 8;    // Shift one byte over
  cycle_time += B11111111;         // Add one more byte

  while (current_cycle != 0)
  {
    bytte++; 
    current_cycle = current_cycle >> 8;
  }

  if (bytte == last_bytte)
  {
    Serial.print("The timer has stopped incressing at "); 
    Serial.print(last_bytte); 
    Serial.println(" bytes."); 
  }
  
  timer1_write(cycle_time);

  Serial.print("Trying "); Serial.print(bytte); Serial.println(" bytes."); 
  last_bytte = bytte; 

  interrupts(); 
}

void setup() {
  Serial.begin(115200); 
  while(!Serial); 
  delay(5*1000); 
  
  Serial.print("Size of varible being used is "); 
  Serial.println(sizeof(cycle_time)); 

  timer1_attachInterrupt(cycle_I);
  timer1_isr_init();
  
  //TIM_DIV1 = 0,   //80MHz (80 ticks/us - 104857.588 us max)
  //TIM_DIV16 = 1,  //5MHz (5 ticks/us - 1677721.4 us max)
  //TIM_DIV256 = 3 //312.5Khz (1 tick = 3.2us - 26843542.4 us max)
  
  timer1_enable(TIM_DIV16, TIM_EDGE, TIM_SINGLE);
  
  cycle_I(); 
}

void loop() { ; }