Uart Transmit works in STM32CubeIDE but not in PlatformIO (I use the same code)

Development Platforms
1

With the function HAL_UART_Transmit I send a string to the console.

The problem is that the whole thing works in STMCubeID but not on PlatformIO.

When I run the same code on Platform IO, I get nothing on the Consol.

I think it has something to do with the clock.

I measured the 100ms delay with a logic analyzer. On the STM32Cube I measured 107ms and on Platform IO 102ms.

platformio.ini

platform = ststm32
board = nucleo_f303k8
framework = stm32cube
board_build.f_cpu = 8000000L

main

Unfortunately, I did not see my error.

Did anyone have the same problem?

Thanks for your help

2

That’s a buffer overflow and thus undefined behavior. Your 43-character string (including NUL-terminator) cannot fit in a 12 byte buffer.

3

Thank you for your reply and advice.
I have set the buffer length to the correct size.
Unfortunately, I still can’t see anything on the console.

4

Are you sure this is the platformio.ini? It is missing an [env:nucleo_f303k8] line there.

Also you should add

monitor_speed = 38400

the platformio.ini (docs) so that the serial monitor will have the right baudrate as configured in the code.

Also per user manual

grafik
grafik756×339 17.8 KB

so PA2 and PA15 should be the UART TX/RX pins. The code should be okay though, I used STM32CubeMX to generate the default code for the Nucleo F303K8 and its main.c looks practically the same.

You enter the serial monitor by executing the project task “Upload and Monitor”, right? Do you see that it selects the correct COM port of the Nucleo?

5

I have added monitor_speed = 38400 in the platformio.ini file.
Unfortunately it does not work.
In the serial monitor tab I can see that it selects COM10. In the device manager I can also see the device on COM10.

image
image1698×206 17.6 KB

Unfortunately I do not get any messages or errors.

6

The board supports Arduino per docs. Please do a short sanity check that the board is generally working.

Create a new project for the ST Nucleo F303K8 with the Arduino farmework and use

[env:nucleo_f303k8]
platform = ststm32
board = nucleo_f303k8
framework = arduino
monitor_speed = 115200

#include <Arduino.h>

void setup() { Serial.begin(115200); }
void loop() { Serial.println("Hello"); delay(1000); }
7

Also don’t forget to use the project environment switcher to switch to the newly created project. That’s not done automatically.

8

I have created a new project with the Arduino Framwork and your code.
Now I get this error message in the serial console:
could not open port 'COM10': could not open port 'COM10': PermissionError(13, 'Access is denied.', None, 5)

9

Seems like the COM port is still open? Try to abort all previous PlatformIO tasks in the terminal with Ctrl+C.

10

The Arduino example works, but unfortunately the STM32Cube code does not.

11

Can you upload the whole non-working STM32Cube project?

12

Hello I have uploaded the project to github.
Thank you very much for your help.

13

For me changing the toolchain/IDE environment in STMCubeMX from EWARM ( the default ) to STMCubeIDE fixed the problem.

14

I am facing same Issue for UART TX
Code from STM32Cube is not working in PlatformIO

Board: STM32F407G-DISC1 (STM32F4 Discovery Eval Board)
Code Details: Placed at github main.c

cc @maxgerhardt

15

There is no obvious mistake in the code. Can you debug the program via the debug sidebar? Just place a breakpiont at HAL_Delay(900); in main.c and see if execution reaches this point.

16

Yes
Code is reaching the breakpoint HAL_Delay(900);

I am get only Garbage value in UART Serial monitor(refer the screenshot),
But If compile and upload same code via STM32Cube IDE then it is working without any issue.

From PlatformIO

image
image1918×1022 173 KB

From STM32Cube IDE

image
image1925×1022 153 KB

17

Garbled UART output is a strong sign that the clock is incorrectly configured. Thus it’s very likely you forgot to also configure the macros that the STM32CubeIDE project sets in PlatformIO. Specifically the clock frequencey seems wrong. In the STM32CubeIDE project, you can right click on the project and look in the C/C++ builder settings, GCC preprocessor.

grafik
grafik804×834 34.9 KB

So if I wanted to properly port this over to PlatformIO, it should be

build_flags =
  -D DEBUG
  -D USE_HAL_DRIVER
  -D STM32F103xB

The macro HSE_VALUE describes the frequency of the external crystal in Hertz. For a Discovery F407 that should be 8MHz per schematics.

grafik
grafik1191×552 53.7 KB

But there’s a mention of 25MHz here (wrong)

and your config file that says 8MHz here

is likely not even used because you didn’t tell PlatformIO to use your configuration header. For that, as the documentation says,

board_build.stm32cube.custom_config_header = yes

Similiarly, it will ignoring your system_stm32f4x.c because board_build.stm32cube.system_file is not set to it.

If you want to keep is simple, at the very least you need

build_flags =
  -DHSE_VALUE=8000000

or, use the above settings to correctly configure the project to use your stm32f4xx_hal_conf.h, system_stm32f4x.c etc.

18

I understand mistake which I made
Now It is working fine.

By Made below changes

Other Question

image
image971×610 40.4 KB

Without adding this three build flags in PlatformIO UART is working fine.

build_flags =
  -D DEBUG
  -D USE_HAL_DRIVER
  -D STM32F407xx

is it mandatory to add this build flag? when this build flag will become important?