Arduino for STM32

Can't you get inspiration from the libmaple implementation?

Do you use STM32CUBEIDE as development environment and uploading?
Well, in this case I cannot help you, I do not how this IDE works.
Did you try the upload with Arduino IDE?

According to the reference manual, once the IWDG is started it cannot be stopped except by a Reset.

Man, I own you a beer, thanks a lot, that was it!

Actually, only PSIZE must be changed, because:

In direct mode, MSIZE is forced by hardware to the same value as PSIZE as soon as bit EN = '1'.

(chap. 9.5.5. of RM0383)

I have analyzed the output data.

Instead of:
40 00 40 00 3F 9C 3F 9C

the bad stream is:
40 (40) 00 (00) 40 (40) 00 (00) 3F (3F) 9C (9C) 3F (3F) 9C (9C)

So it looks like the DMA sends each byte repeatedly from the buffer: x (x-repeated)

WHY ???

Hi,

I am currently struggling to get I2S working with DMA as master Tx on STM32F411E disco board.
The I2S data coming out on SD line is very strange.
I attach a good picture, and a bad picture.
The good picture is taken when I write data manually to the SPI data register.
good.jpg
The bad picture ...

The best way to measure high frequencies is to setup a timer to measure nr of pulses you apply within a predetermined period (for which you can also use another timer). If you need to measure duty cycle the the things get more complicated.
I think I posted such kind of example couple of years ago ...

@pschatzmann
I am also interested to have F411 disco with audio working.
I have found this project:
https://github.com/winfred-lu/STM32Cube ... and_record
Maybe you can find something interesting there.

@stevestrong
This menu is part of the libmaple core:
https://github.com/rogerclarkmelbourne/Arduino_STM32/blob/master/STM32F1/boards.txt#L446


That is true, just that
STM32F1XX/GD32F1XX Boards by stm32duino.
is not known.

asking supposed it is the Libmaple core, what exactly is not working ...

@asking which core do you use?
How did yo get this board in Arduino boards menu?