I ran into EVERY_N_SECONDS() and related macros (in lib8tion.h),

Tom_Gerhard · November 22, 2017, 2:23am

I ran into EVERY_N_SECONDS() and related macros (in lib8tion.h), and have been using it successfully, but I’d like it to run immediately when my program starts, instead of waiting n seconds until the first firing. I could pull the code into a function and call it both from setup() and EVERY_N_SECONDS(), but it would be nice if there were a way to have it fire on the first pass thru loop(). Any suggestions or tricks?

Ryan_Cush · November 22, 2017, 4:32am

Could you use the EVERY_N_MILLIS_I form where you can change the timer, and start with it at 0 or 1 ms and then immediately update it to your preferred timing?

marmil · November 22, 2017, 6:59am

Ryan’s suggestion is a good one I’ve used several times. Here’s an example of using EVERY_N_MILLIS_I, not using Ryan’s suggestion, but just use in general. (Look in bottom part of main loop).

github.com

marmilicious/FastLED_examples/blob/master/every_n_timer_variable.ino

// EVERY_N trigger timer and variable timer example
//
// Using EVERY_N with a timer check to always run "Event B" at
// a specific time after "Event A".
//
// Also, an example of using EVERY_N with a random variable time.
//
// Marc Miller,  May 2016
//---------------------------------------------------------------

#include "FastLED.h"
#define LED_TYPE APA102
#define DATA_PIN 11
#define CLOCK_PIN 13
#define NUM_LEDS 39
#define COLOR_ORDER BGR
#define BRIGHTNESS 32
CRGB leds[NUM_LEDS];

uint16_t timerA = 3000;  // How often to run Event A [milliseconds]

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Nikolay_Hristov · November 22, 2017, 8:32am

EVERY_N_MILLIS_I , thats exactly what I’ve needed - thx !

Tom_Gerhard · November 22, 2017, 11:37am

Thanks, that’s a nice clean solution.