I’m new to both Arduino & freeRTOS, but exploring both to get my feet wet.
I took the example sketch AnalogRead_DigitalRead and when it didn’t work startd to strip it down to its bare bones to narrow down what was and wasn’t working.
So far it seems output via serial (USB) from the program shows up correctly on the IDE’s serial monitor from the setup() function, which is where I also launch a single task.
However I cannot see any sign that the task ever runs. I stripped out evderything from the task function to just a forever loop, a Serial.print() call and a 10 second vTaskDelay() call.
This made me wonder, could the Serial.print() function call not be task safe or otherwise incompatible? It also occurs to me that it may also be a blocking function, though not necessarily so.
Any one have a read on what I’m doing wrong here?
Also is there a good list of Arduino runtime calls that are safe to be called from freeRTOS tasks and which ones block?
My source code follows below. The only output I get from the serial monitor is the following:
23:28:08.952 → Creating task
23:28:09.056 → Task created
23:28:09.158 → Ready to run
#include <Arduino_FreeRTOS.h>
// define two Tasks for DigitalRead & AnalogRead
void TaskDigitalRead( void *pvParameters );
// the setup function runs once when you press reset or power the board
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600, SERIAL_8N1);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB, on LEONARDO, MICRO, YUN, and other 32u4 based boards.
}
Serial.print("Creating task\n");
delay(100);
if( xTaskCreate( TaskDigitalRead, "DigitalRead", 128, NULL, 2, NULL )
== pdPASS )
{
Serial.print("Task created\n");
delay(100);
}
else
{
Serial.print("Error creating task\n");
delay(100);
}
Serial.print("Ready to run\n");
delay(100);
}
void loop()
{
Serial.print("In loop()\n");
}
/*--------------------------------------------------*/
/*---------------------- Tasks ---------------------*/
/*--------------------------------------------------*/
void TaskDigitalRead( void *pvParameters __attribute__((unused)) ) // This is a Task.
{
for (;;) // A Task shall never return or exit.
{
Serial.print("In TaskDigitalRead\n");
vTaskDelay(10000 / portTICK_PERIOD_MS); // one tick delay (15ms) in between reads for stability
}
}