hathach
commented
10 months ago The behavior is correct, it delay 3 seconds per code instruction. The interrupt handler does waked cpu up and run the attached function. If you want different behavior, you should change your code.
This core is indeed different from Arduino one, and make use of freeRTOS, for your usage, I would suggest to use an semaphore instead of delay(). Try to take semaphore in the loop, while the interrupt function give semaphore when it invoked. Hope that help and sorry for the super late response.
Operating System
Others
IDE version
Arduino 2.0
Board
Adafruit Feather nRF52840 Express
BSP version
1.3.0
Sketch
include
define GPS_INT 6 // D6, int1
volatile int repetitions = 1; bool ledSw = true;
void repetitionsIncrease() { // This function will be called once on device wakeup // You can do some little operations here (like changing variables which will be used in the loop) // Remember to avoid calling delay() and long running functions since this functions executes in interrupt context repetitions ++; Serial.print("Interrupt happen - "); Serial.println(repetitions); }
void setup() { // I connect the interrupt pin to GPS module, it provide trigger per second. pinMode(GPS_INT, INPUT); pinMode(LED_BUILTIN, OUTPUT);
Serial.begin(115200); while ( !Serial ) delay(10);
attachInterrupt(digitalPinToInterrupt(GPS_INT), repetitionsIncrease, RISING); }
void loop() {
Serial.println("Start of loop."); ledSw = !ledSw; digitalWrite(LED_BUILTIN, LOW); delay(3000); Serial.println("Wake up from delay."); }
What happened ?
I coded with Arduino nano before, and many projects work with it well. I recently bought [Adafruit Feather nRF52840 Express] and found many behavior differences with Arduino nano, especially the interrupt mechanism.
I saw the delay() function is the same with sleep() from many Q&A, I need to program my uC with an event trigger that sleeps until calendar IC wakes it up, and I write the test code as the posted code, it sleeps 3 seconds in the loop(), but interrupt per second, the result is as bellow:
In my expectation, it should be wake up every second, which means the interrupt event does not break the delay(3000), the hardware interrupt happened, but the main thread still stuck in delay(3000), it executes the next instruction after the 3 seconds count down finish, it should be a Low-level error, but I have no idea no one reports it.
And I am still confused, there are many libraries or documents titled nRF52-serials or nRF52-base, but they only support nRF52832 but not 52840, and there are many library mixes inside the library, and not know their functions come from, I can't find these function from Arduino Language Reference, I saw many functions from softdevice that develop from Nordic, but it no action when I call it in my sketch, and I also saw many functions from FreeRTOS, and I have no idea how should I code it with my Arduino sketch, I hope you can give me a direction how to start my coding.
Eyes Blue
How to reproduce ?
The result as bellow:
My expectation it should be:
Debug Log
No response
Screenshots
No response