Arduino for STM32

Posted: **Sun Apr 21, 2024 12:14 am**

Friends, thanks for the tips!

So, I bought 10 8 MHz HSE boards.
All the boards are stitched by the manufacturer with a demo program with a flashing LED, and they all flash the LED when connected, which means that all the boards are working!

1. All boards with a frequency of 8 MHz - I took a photo and will attach it soon.

2. The boards switch to DFU mode by pressing the buttons, as you wrote

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                       STM32CubeProgrammer v2.16.0                  
      -------------------------------------------------------------------



USB speed   : Full Speed (12MBit/s)
Manuf. ID   : STMicroelectronics
Product ID  : STM32  BOOTLOADER
SN          : 389E33553233
DFU protocol: 1.1
Board       : --
Device ID   : 0x0431
Device name : STM32F411xC/E
Flash size  : 512 KBytes (default)
Device type : MCU
Revision ID : --  
Device CPU  : Cortex-M4


Memory Programming ...
Opening and parsing file: Blink.ino.bin
  File          : Blink.ino.bin
  Size          : 23.57 KB 
  Address       : 0x08000000 


Erasing memory corresponding to segment 0:
Erasing internal memory sectors [0 1]
sector 0000 does not exist
sector 0001 does not exist
Download in Progress:


File download complete
Time elapsed during download operation: 00:00:00.493

RUNNING Program ... 
  Address:      : 0x8000000
Start operation achieved successfully

3. I select "USB CDC Serial", but after flashing the program into the microcontroller, the COM port is not displayed on PC devices (I checked in Windows Device Manager)- so the microcontroller does not start!
4. I have corrected the file C:\Users\Admin\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.4.0\variants\STM32F4xx\F411C(C-E)(U-Y)\variant_BLACKPILL_F411CE.cpp

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  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 48;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
  RCC_OscInitStruct.PLL.PLLQ = 8;

Posted: **Sun Apr 21, 2024 12:50 am**

Added a corrected file C:\Users\Admin\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.4.0\variants\STM32F4xx\F411C(C-E)(U-Y)\variant_BLACKPILL_F411CE.cpp

I tried your advice, but the boards still don't work after the firmware.
Now I will try to flash through the stm32cube programmer

Posted: **Sun Apr 21, 2024 1:59 am**

1. Updated STM32 Library to version 2.7.1
2. Performed the download via the stm32 cube programmer DFU

Posted: **Sun Apr 21, 2024 2:03 am**

@Fziegler_076 wrote:

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  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 48;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
  RCC_OscInitStruct.PLL.PLLQ = 8;

^ this won't work, try

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  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 192;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 4;

fcpu is HSE 8 Mhz / M * N / P = 8 / 8 * 192 / 2 = 96 Mhz
and usb bus speeds is HSE 8 Mhz / M * N / Q = 8 / 8 * 192 / 4 = 48 Mhz

Posted: **Sun Apr 21, 2024 2:07 am**

Code: Select all

  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 192;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 4;

Unfortunately, this does not work either (

Posted: **Sun Apr 21, 2024 2:20 am**

The values given and used are correct, yup check the LED, try to use a led connected to a different pin manually e.g. on the headers.
I've more than once used boards with a 'defective' LED, sometimes they put the LED reversed, that'd never light up.
manufacturing error. no need to look at schematic. if we assume that PC13 is correct.

the other way is to measure pins with a volt meter.

Posted: **Sun Apr 21, 2024 2:22 am**

The documentation for the board version 3.1 indicates that the LED is connected to the PC 13. I indicated it correctly in the program

C:/Users/Admin/Downloads/WeActStudio.MiniSTM32F4x1-master/WeActStudio.MiniSTM32F4x1-master/HDK/MiniF4x1Cx_V31.pdf

Posted: **Sun Apr 21, 2024 2:26 am**

I have tested this on 3 boards.
I think that the microcontroller freezes, because after the firmware, the COM port does not appear in the computer devices, although I turn on the "USB CDC Serial" setting

Posted: **Sun Apr 21, 2024 2:29 am**

if you really want to get to the bottom of that, the only way seemed to be to use a st-link v2
https://www.adafruit.com/product/2548
https://www.st.com/en/development-tools/st-link-v2.html
https://octopart.com/search?q=st-link+v ... SD&specs=0
then you can try to debug that, but that would require setting up your IDE to work properly so that it actually trace the codes

for those PLL M,N,P.Q settings USB should work, so the virtual com port should appear.
but that is beyond basic test.
At a very least, if you turn on a led it should light up.
In fact, according to the schematic, just

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pinMode(PC13, OUTPUT);

would light up the led, if the led is working correctly.

otherwise to check, use a led to check manually on the header pins or use a voltmeter (e.g. multi-meter) to measure that.
a HIGH level on a pin is close to VDD 3.3v

in fact for the led test, if you think that the crystal has a problem you can even try

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void SystemClock_Config() {

return; // <- return on entry, so no clock setting is done

....
}

this will run on HSI (internal oscillator) 16 Mhz (no usb), select uart for serial so that it won't hang on the usb. but the led should still light up if

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void setup() {
	pintMode(PC13, OUTPUT);
}

is run.

the stm32cube programmer log messages seem to indicate that the sketch firmware is installed correctly.
I'm not sure if that 'sector 0 does not exist' message meant any errors.

Posted: **Sun Apr 21, 2024 2:39 am**

Thanks for the tips!

Now I will solder the connector to the board and try to flash it through ST-LINK.

Arduino for STM32

WeAct Studio STM32F411CEU6 BlackPill v3.1 crystal is 8 MHz

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