Arduino for STM32

Posted: **Sun Apr 19, 2020 10:29 am**

Hello. I encountered a restriction on the use of pins. I need to use USB pins (PA11 and PA12) for my own purposes. But if I write a simple sketch, then the pin switching does not happen:

Code: Select all

#define Pin1 PA11
#define Pin2 PA12

void setup() {
    pinMode(Pin1, OUTPUT);
    pinMode(Pin2, OUTPUT);
}

void loop() {
    digitalWrite(Pin1, LOW);
    digitalWrite(Pin2, LOW);
    delay(1000);
    digitalWrite(Pin1, HIGH);
    digitalWrite(Pin2, HIGH);
    delay(1000);
}

It seems that somewhere these pins are used, possibly USB Serial. Can I use these pins somehow?

Posted: **Sun Apr 19, 2020 10:49 am**

From: http://docs.leaflabs.com/docs.leaflabs.com/index.html GPIO Information

Pin D23 (PA12) is the USB D+ line, and D24 (PA11) is the USB D- line. To use them as GPIOs, your program will need to disable SerialUSB first. Be aware, however, that disabling SerialUSB means that the bootloader won’t work properly, and you’ll need to use Perpetual Bootloader Mode to make your next upload.

Ray

Posted: **Sun Apr 19, 2020 1:15 pm**

Thanks!
Can you tell me how to disable SerialUSB?

Posted: **Sun Apr 19, 2020 3:38 pm**

Code: Select all

Serial.end();

Posted: **Sun Apr 19, 2020 5:31 pm**

Thank you, you helped me a lot!

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