STM32L476 Nucleo USER button doesn't function

[woxinwuchen]

Hi , I am using STM32L476 Nucleo board. But when I load example code "button". The USER button doesn't take effect. I have test the read back status of USER button via Serial port . It turn out to be random values. I have tested example code "blink" which works good. And I have tried to upload ST offical demo code hex "STM32CubeL4_Demo_STM32L476RG_Nucleo.hex". It works fine. And the button works too. So I suppose it is configuration problem, right? But I have searched in google and other platform . I couldn't find answer. Could you help me?

Here is my configuration and platform. OS : tested in MAC OS Sierra and Win 7 ultimate x64 Arduino IDE 1.8.3 Board : Nucleo-64 Board part number : Nucleo L476RG Upload method : Stlink Usb inter face : none Other serial instance : all Port : serial port 1423

Code : int buttonPin = 2; // the number of the pushbutton pin

// variables will change: int buttonState = 0; // variable for reading the pushbutton status

void setup() { // put your setup code here, to run once: pinMode(LED_BUILTIN, OUTPUT); pinMode(buttonPin, INPUT); Serial.begin(9600); }

void loop() { // put your main code here, to run repeatedly: buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed. // if it is, the buttonState is HIGH: if (buttonState == HIGH) { // turn LED on: digitalWrite(LED_BUILTIN, HIGH); } else { // turn LED off: digitalWrite(LED_BUILTIN, LOW); } Serial.println(buttonState);

delay(1000); // delay in between reads for stability }

[kriswiner]

Button is on either pin 39 or 44.

On Sat, Aug 12, 2017 at 10:00 AM, woxinwuchen notifications@github.com wrote:

Hi , I am using STM32L476 Nucleo board. But when I load example code "button". The USER button doesn't take effect. I have test the read back status of USER button via Serial port . It turn out to be random values. I have tested example code "blink" which works good. And I have tried to upload ST offical demo code hex "STM32CubeL4_Demo_STM32L476RG_Nucleo.hex". It works fine. And the button works too. So I suppose it is configuration problem, right? But I have searched in google and other platform . I couldn't find answer. Could you help me?

Here is my configuration and platform. OS : tested in MAC OS Sierra and Win 7 ultimate x64 Arduino IDE 1.8.3 Board : Nucleo-64 Board part number : Nucleo L476RG Upload method : Stlink Usb inter face : none Other serial instance : all Port : serial port 1423

Code : int buttonPin = 2; // the number of the pushbutton pin

// variables will change: int buttonState = 0; // variable for reading the pushbutton status

void setup() { // put your setup code here, to run once: pinMode(LED_BUILTIN, OUTPUT); pinMode(buttonPin, INPUT); Serial.begin(9600); }

void loop() { // put your main code here, to run repeatedly: buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed. // if it is, the buttonState is HIGH: if (buttonState == HIGH) { // turn LED on: digitalWrite(LED_BUILTIN, HIGH); } else { // turn LED off: digitalWrite(LED_BUILTIN, LOW); } Serial.println(buttonState);

delay(1000); // delay in between reads for stability }

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[woxinwuchen]

@kriswiner Thank you for your reply. I have just tested with pin 39/44. It still doesn't work.

[GrumpyOldPizza]

It seems that for the Nucleo the button is D22.

However I am puzzled as to why you don't just use the standard defines for the user button (which is consistent for all Arduino platforms):

// Other pins

define PIN_BUTTON (22)

static const uint8_t BUTTON = PIN_BUTTON;

On Sun, Aug 13, 2017 at 1:11 AM, woxinwuchen notifications@github.com wrote:

@kriswiner https://github.com/kriswiner Thank you for your reply. I have just tested with pin 39/44. It still doesn't work.

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[woxinwuchen]

Thank you guys, for your kind help . I have found the reason. Due to I am a newbie. I have added a wrong "Additional Board Manager URL". The URL I added before is from other project. Thank you again!