Not returning value in function causes panic message

[datphys]

Board

Esp32 dev module

Device Description

Cusom board

Hardware Configuration

pin 27 control power key of modules sim

Version

v2.0.8

IDE Name

Arduino IDE 2.0

Operating System

Windown 10

Flash frequency

240 MHz

PSRAM enabled

no

Upload speed

115200

Description

Module reset frequenly

Sketch

//in sketch file
#include <LYNQ_L506.h>
const int pwrkey = 27;
l506_init(&Serial1, pwrkey);
l506_power_on_off();     // ----> reset here
// Replace with
digitalWrite(pwrkey, HIGH);
delay(2500);
digitalWrite(pwrkey, LOW); // ----> Working

# header file
#include <Arduino.h>
void l506_init(HardwareSerial *serial, int pin);
int8_t l506_power_on_off();

# cpp file
void l506_init(HardwareSerial *serial, int pin)
HardwareSerial *l506;
int PWRKEY;

{
    l506 = serial;
    PWRKEY = pin;
    pinMode(PWRKEY, OUTPUT);
    digitalWrite(PWRKEY, LOW);
}

int8_t l506_power_on_off()
{
    digitalWrite(PWRKEY, HIGH);
    delay(2500);
    digitalWrite(PWRKEY, LOW);
}

Debug Message

Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[SuGlider]

@datphys -

This has nothing to do with digitalWrite().
The issue is about declaring a function that shall return a value, but nothing is returned.

You can fix it by:

• making the function l506_power_on_off() void like: void l506_power_on_off()
• returning a value, for instance zero, at the end of the function l506_power_on_off()

[SuGlider]

You should see a warning message in the compilation output:

LYNQ_L506.cpp: In function 'int8_t l506_power_on_off()':
LYNQ_L506.cpp:18:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

[SuGlider]

You can enforce such warning as an error by setting Compiler warnings: option to More or All
This is done in the Arduino IDE Menu->File-> Preferences

[mrengineer7777]

Solution noted above