B4R Question AppStart shows twice in Logs

[aeric]

Is this normal?

Spoiler

Linking everything together...
"C:\\arduino\\hardware\\tools\\avr/bin/avr-gcc" -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -mmcu=atmega328p -o "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin/src.ino.elf" "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin\\sketch\\B4RArduino.cpp.o" "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin\\sketch\\B4RCore.cpp.o" "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin\\sketch\\B4RStream.cpp.o" "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin\\sketch\\Scheduler.cpp.o" "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin\\sketch\\b4r_main.cpp.o" "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin\\sketch\\src.ino.cpp.o" "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin/core\\core.a" "-LC:\\B4X\\DEVELO~1\\Button\\Objects\\bin" -lm
"C:\\arduino\\hardware\\tools\\avr/bin/avr-objcopy" -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin/src.ino.elf" "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin/src.ino.eep"
"C:\\arduino\\hardware\\tools\\avr/bin/avr-objcopy" -O ihex -R .eeprom "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin/src.ino.elf" "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin/src.ino.hex"
"C:\\arduino\\hardware\\tools\\avr/bin/avr-size" -A "C:\\B4X\\DEVELO~1\\Button\\Objects\\bin/src.ino.elf"
Sketch uses 6318 bytes (19%) of program storage space. Maximum is 32256 bytes.
Global variables use 292 bytes (14%) of dynamic memory, leaving 1756 bytes for local variables. Maximum is 2048 bytes.
Uploading...
********************* PROGRAM STARTING ****************
AppStart
AppStart
State: 0
State: 1
State: 0
State: 1

Button example:

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 300
#End Region
'Ctrl+Click to open the C code folder: ide://run?File=%WINDIR%\System32\explorer.exe&Args=%PROJECT%\Objects\Src

Sub Process_Globals
    Public Serial1 As Serial
    Private btn As Pin 'pin for the button
    Private led As Pin 'pin for LED 13 on the Arduino
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    led.Initialize(13, led.MODE_OUTPUT)
    btn.Initialize(btn.A0, btn.MODE_INPUT_PULLUP) 'Using the internal pull up resistor to prevent the pin from floating.
    btn.AddListener("Btn_StateChanged")
End Sub

Sub Btn_StateChanged (State As Boolean)
    Log("State: ", State)
    'state will be False when the button is clicked because of the PULLUP mode.
    led.DigitalWrite(Not(State))
End Sub

B4R version 3.90
Arduino IDE 1.8.19
Arduino UNO R3
Windows 11

 

[aeric]

Every time I click on the "Disconnect" button (next to Clear Logs button) and then Click "Connect", the Logs will show "AppStart".

 

[RJB]

They quite often restart on 'Connect' so that's probably normal.
You can sometimes get a brownout at start up if the power supply(USB?) is not up to the current need or if the usb lead isn't very good or too long.
I've seen the analogue input used for switches like this but I don't know why as a button input is digital?

 

[KMatle]

I can confirm this. Connect means restart. Other reason is a brownout as RJB stated. USB normally has an output of 500 mA which is quite at the minimum. "Heavy" code executions (like encryption, wifi/bt start) often causes these brownouts. An 1 A power supply should be ok.

 

[aeric]

Should I bother to fix or ignore it?
Since USB is always supply 500mA then is there any solution?

 

[f0raster0]

Should I bother to fix or ignore it?
Since USB is always supply 500mA then is there any solution?

USB can go over 0.5A, I had used 600-700mA not a problem. USB-C can go over 1A (don't remember)

I don't think your log-problem is about current.

Check if it also happen when using 9600
or adding a delay

 

[Erel]

It is normal. It is related to the DTR pin which causes the Arduino to restart.

You can disable this behavior by using the external serial connector and unchecking the "reset on connection" options: https://www.b4x.com/android/forum/threads/tool-external-serial-connector.65724/#content
It might have other unwanted side effects.

 

[aeric]

Check if it also happen when using 9600

It seems it is not happening when selecting Baud Rate 9600

 

[aeric]

It is normal. It is related to the DTR pin which causes the Arduino to restart.

You can disable this behavior by using the external serial connector and unchecking the "reset on connection" options: https://www.b4x.com/android/forum/threads/tool-external-serial-connector.65724/#content
It might have other unwanted side effects.

When unchecking the "Reset on connection" option, some weird characters appear in the Logs text area.