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: [Select all] [Expand/Collapse]

1.  
2. #define PHOTO_PIN  4
3.  
4. int lightLevel = 0;
5. static const TickType_t lightDelay = 2000 / portTICK_PERIOD_MS;
6. static TimerHandle_t lightTimer = NULL;
7.  
8. void setup() {
9.  
10.   Serial.begin(38400);
11.   delay(1000);
12.   Serial.println("Load timer");
13.   lightTimer = xTimerCreate(
14.                  "lightTimer",
15.                  lightDelay,
16.                  pdTRUE,
17.                  (void *)0,
18.                  lightTimerCallback);
19.  
20.   Serial.println("Start timer");
21.   xTimerStart(lightTimer, portMAX_DELAY);
22.   vTaskDelete(NULL);
23. }
24.  
25. void lightTimerCallback(TimerHandle_t xTimer) {
26.   Serial.print("core: ");
27.   Serial.println(xPortGetCoreID());
28.   lightLevel = analogRead(PHOTO_PIN);
29.   Serial.print("lightLevel: ");
30.   Serial.println(lightLevel);
31. }
32.  
33. void loop() {
34. }

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