How to display data every 10 seconds?

Projects Programming
22

If you want a framerate control (do a certain amount of thing every X time apart), do this:

unsigned long lastFrameStart;
unsigned long nextFrameStart;
bool justRendered;
uint8_t lastFrameDurationMs;
uint16_t frameCount;
uint16_t frameDiff;


bool setFrameDiff
(uint16_t rate)
{
  frameDiff = rate;
  return 0;
}
bool nextFrame
(void)
{
  unsigned long now = millis();
  bool tooSoonForNextFrame = now < nextFrameStart;

  if (justRendered) {
    lastFrameDurationMs = now - lastFrameStart;
    justRendered = false;
    return false;
  }

else if (tooSoonForNextFrame) {
    if ((uint8_t)(nextFrameStart - now) > 1)
      sleep(1);//delay(1) when the processor does not support "sleep" function
    return false;
  }

  // pre-render
  justRendered = true;
  lastFrameStart = now;
  nextFrameStart = now + frameDiff;
  frameCount++;
  //if (frameCount > 20000)
    //frameCount = frameCount - 20000;
  return true;

The code is part of my library that display graphics on a screen at 50Hz. or 10Hz.

I then used "frameCount" to poll data from a temperature sensor (and/or PM sensor) every 25/5 frames (every half a second) to make sure I don't miss out anything, since the sensors will respond with "NACK" when the data is not ready.