Arduino for STM32

Test delay() speed by blinking a single LED.
Also, keep in mind that your LED is on when the pin is low.

Chances are that your code is doing exactly what you have told it to do and there is no issue with timing.

Add your .ino to a zip file and you should be able to attach it. STM32 Cores 1.9.0 is the "official" core. The other is libmaple that someone created to make it easier to install. Long before there was an official core, this forum was stm32duino and Roger's libmaple core was the only Ardui...

Snippets from one of my projects on a STM32F407 black board: #define mySerial SerialUSB HardwareSerial gpsSerial(PA10, PA9); in setup() mySerial.begin(9600); gpsSerial.begin(9600); in loop() if (gpsSerial.available()) { char ch = gpsSerial.read(); mySerial.print(ch); } Options - USB: CDC enabled, no...

Before debugging direct port manipulation, try digitalWriteFast(). See https://www.stm32duino.com/viewtopic.php?p=477#p477 . Note that digitalWriteFast uses different arguments (PA_1 instead of PA1) for operation. There are macros that do the conversion between pinNames and pinNumbers. Search the fo...

A quick DDG search finds http://ims-kharkov.narod.ru/stm32pcb.htm which has several links to schematics. The page is in Russian, but appears to contain one schematic that matches your processor.

Coding a working hierarchical menu on a microprocessor is a good coding exercise. There are many ways to get there. The first thing I would do is to create a flowchart and map out each menu with exactly what you want to happen when buttons are pressed. I wrote my first menu system for an 8051 about ...

You probably want to debounce in software rather than hardware. Tactile switches are very noisy and hard to use with an interrupt pin. Add this code after loop: //poll every millisecond void HAL_SYSTICK_Callback() { // call switch debounce code from here } If you have a good software debounce, you d...

Ray's advice to store local copies of the libraries with each project is sound. I've had a couple of projects unexpectedly fail to compile after a 3rd party library was automatically updated. Now I always copy any needed libraries into the project folder.

No need for additional bootloaders.

Press both buttons, release reset, release boot 0. That should put you in dfu mode.

For new users, the recommended path is to use the official STM core. https://github.com/stm32duino/Arduino_Core_STM32 If you installed the Roger/Maple bootloader, your SWD pins used by ST-Link are likely disabled. Try to upload a blink sketch using the ST-Link. Press reset, click upload, release res...