Software timer assigned core

[grunnels@gmail.com]

Hello. In the attached code, the timer routine always executes on Core 0. Is that a guarantee? Will it always run on Core 0, or is it just because Core 0 doesn't have anything else running at this time? Also, how would I pin this routine to Core 1?

Code: Untitled.cpp Select all

#define PHOTO_PIN  4



int lightLevel = 0;

static const TickType_t lightDelay = 2000 / portTICK_PERIOD_MS;

static TimerHandle_t lightTimer = NULL;



void setup() {



  Serial.begin(38400);

  delay(1000);

  Serial.println("Load timer");

  lightTimer = xTimerCreate(

                 "lightTimer",

                 lightDelay,

                 pdTRUE,

                 (void *)0,

                 lightTimerCallback);



  Serial.println("Start timer");

  xTimerStart(lightTimer, portMAX_DELAY);

  vTaskDelete(NULL);

}



void lightTimerCallback(TimerHandle_t xTimer) {

  Serial.print("core: ");

  Serial.println(xPortGetCoreID());

  lightLevel = analogRead(PHOTO_PIN);

  Serial.print("lightLevel: ");

  Serial.println(lightLevel);

}



void loop() {

}