Serial Port not working on bluepill STM32F103C8T6 + FTDI + PlatformIO

Development Platforms
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1

Hello, I am currently trying to make my stm32 + FTDI so make the serial port working.
with the following circuit:

image
image1200×681 37.7 KB

2

I managed to make it working on the arduino IDE with the following configration:

image

And using Serial1 in the code.

Note that for uploading I use a ST-LINK V2 adapter

3

Now this is my platformIO config for this project
image

PlatfromIO does show the good serial port but I cannot find how to print anything

4

You explicitly enable the USB Serial (CDC), so by default Serial will go to USB device. Not via UART (PA9/10).

What src/main.cpp code are you running on the STM32?

5

image

This is my code, nothing complicated

6

The constructor arguments look wrong, shouldn’t they be PA9 and PA10 instead of PA_9, PA_10?

7

To my knowledge, they are the same, but replacing them changes nothing

8

Okay, indeed both the int version (PA9) and PinName enum (PA_9) are accepted. But RX and TX are reversed.

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image1280×681 153 KB

PA9 = Serial1 TX and PA10 = Serial1 RX

the constructor wants

aka, RX first, then TX.

So you should write

HardwareSerial Serial1(PA10, PA9);
9

Okay yes, my mistake.

how should I fix that ?
When I remove the problematic line, the code doesn’t compile

I wonder what should my platform.ini look like

10

I had problems with Serial1, solved it by adding the line
HardwareSerial Serial2(PA3, PA2);
After that, Serial1(PA10, PA9) worked fine, although I did not specify it at all. And I did not use Serial2, but it also works…
It happened by accident, I do not know the reason for this phenomenon.

Using STM32 HID Bootloader 2.2.2

Releases · Serasidis/STM32_HID_Bootloader (github.com)

\bin\stm32_binaries\stm32_binaries\F103\low_and_medium_density\hid_generic_pc13.bin

https://github.com/stm32duino/BoardManagerFiles/raw/main/package_stmicroelectronics_index.json

stm32 mcu based boards 2.8.1

bluepill setup

Test code:

// test of STM32F103C8T6 board LED and serial

#define ledPin PC13

// hardware serial from https://github.com/stm32duino/wiki/wiki/API#hardwareserial
//                                        RX    TX
// HardwareSerial Serial1(PA10, PA9);
HardwareSerial Serial2(PA3, PA2);
// HardwareSerial Serial3(PB11, PB10);

void setup() {
   
  pinMode(ledPin, OUTPUT);
  Serial1.begin(9600);
  Serial2.begin(9600);
  
  
}

void loop() {
  
  digitalWrite(ledPin, HIGH);
  delay(1000); 
   
  digitalWrite(ledPin, LOW);
  delay(1000); 
  
  
  if (Serial) {
    Serial.println("Hallo, World!");
  }
  
   
  if (Serial1) {
    Serial1.println("Yeah, Science!");
  }
 
  if (Serial2) {
    Serial2.println("Yeah, Science!");
  }
}