Arduino for STM32

You need to enable USB CDC in your sketch, otherwise COM port won't be enabled.
If you don't enable USB CDC you can enter bootloader by setting boot1 jumper to 1 position and resetting board (if you flashed HID bootloader).

5V pin, USB 5V, ST-Link 5V all are connected to one point. If it runs powered from USB, it has to run powered from 5V pin. BUT your 5V supply needs to be 5V +/- 0,25, not 4.5, nor 5.5V If you did what manual says, LD2 cannot lit up when powered with 3.3V pin. SB14 needs to be OFF (removed / not brid...

Have you read this:
https://www.st.com/resource/en/user_man ... ronics.pdf

There is no such thing. STMs do not need to reset on USB connect like AVR Arduino boards.
If your board resets then it's rather hardware related.

STM32 examples for timers are for STM32 core, not for a specific MCU. You don't have to adapt anything.

Blue pills usually do not have usb bootloader flashed. You need to do it yourself and for this you need ST-Link or USB-TTL adapter.

digitalWriteFast/digitalReadFast need 1 MCU cycle. that would be very difficult to do. digitalWriteFast() calls digital_io_write(), which goes through a if..then statement before calling LL_GPIO_SetOutputPin(), which goes to a set of register writes. Hard to believe all that could be done in one cy...

maybe something like this will help. #define LED_PORT GPIOC #define LED_PIN (1<<13) //LED on C13 #define IO_SET(port, pins) port |= (pins) #define IO_CLR(port, pins) port &=~(pins) #define IO_FLP(port, pins) port ^= (pins) #define GIO_SET(gpio, pins) IO_SET(gpio->ODR, pins) #define GIO_CLR(gpio...

There's "big" user error and your program crashes. ... Theta[200].... for(int n=2;n<200;n++) { ... Theta[n+1]=... } What do you mean? can you elaborate or suggest a fix? Theta is 200 element array - last element's index is 199. for(int n=2;n<200;n++) runs for n=2 to 199. There is no Theta...

... As Gonzo G suggested, I am not using digitalWriteFast anymore. I was expecting a higher speed. Am I wrong? Here is the code: #ifndef _NOP // required for some non Arduino cores #define _NOP() do { __asm__ volatile ("nop"); } while (0) #endif #define PIN PC13 void setup() { pinMode(PIN...