Arduino for STM32

Don't treat GPIO pins as power source. They are not meant for this.

And yes, they can be set to low state (GND) or high (usually 3.3V).

Depends on what you mean by "-".
1. Is it a negative voltage (in relation to GND) - then they are always >= 0V
2. or is it GND - then both. They can be + or -.

F103 does not have hardware USB bootloader. If there is no firmware with USB support there won't be a connection.
I recommend flashing HID bootloader, but you need USB-TTL adapter or ST-Link.

You won't find it. It's hardware counter. It's changed by hardware.

SKR 3 uses 25MHz external oscillator, generic H723 is defined with internal oscillator, you might need to define new board variant: https://github.com/stm32duino/Arduino_Core_STM32/wiki/Add-a-new-variant-%28board%29 or redefine SystemClock_Config(void) Also, I think that HS USB needs external PHY th...

analogWriteFrequency(1000);is to set the frequency of all PWM, how to set the frequency of 1 pin separately analogWriteFrequency(); changes frequency for next use of analogWrite(), but it will change frequency for all channels on a timer. If you use 2 or more pins that use same timer for PWM, frequ...

Probably the same as for F407:
viewtopic.php?p=12993#p12993

dannyf wrote: ↑Wed Oct 25, 2023 9:42 pm

18MHz signal.

Fast IO is implemented via BRR/BSRR.

Hard to imagine that they could get that fast.

digitalWriteFast and digitalReadFast are using LL functions. With O3 (fastest) optimization they can go this fast.
On F401 and F411 they need 1 MCU cycle.
This is what I get with F411CE:

I got 19MHz wit digitalReadFast and 33MHz with digitalWriteFast, but with typing 1000 lines of code. While loop needs few cycles. @GonzoG PLease give us your code ! (I do not pretend to get the fastest .. just starting to play) Sorry.. copied wrong values. Those were Mops/s, so frequency is half of...

ManX84 wrote: ↑Mon Oct 23, 2023 4:04 pm Need Faster ?

Code: Select all

	// Here use a digitalWriteFast !
	do
	{
		digitalWriteFast(PC_13, 1);
		digitalWriteFast(PC_13, 0);
	} while (1);

F = 7 MHz!

I got 19MHz wit digitalReadFast and 33MHz with digitalWriteFast, but with typing 1000 lines of code.
While loop needs few cycles.