Foreword

Reference link:
1、Using the Arduino IDE development STM32F10X
2、
Require tools:
STM32F103 development board, my wildfire - guide
The required resource file:

Extraction code: Q251

First, install

1. Double-click Arduino-1.8.12-Windows, install, do not need to click on other options during installation, and you can click Next.

2, wait for the installation to complete

3. Copy the Arduino_STM32 of the package file to the HareWare under the Arduino IDE installation directory, I am C: \ Program Files (x86) \ Arduino \ Hardware. These profiles are written abroad, and his latest configuration files are on the github website https://github.com/rogerclarkmelbourne/ARDUINO_STM32.

4. Enter the ARM key search in the Tool \ Development Board \ Development Board Manager, select the Cortex-M3 series compile support file and install

Second, serial port communication

1, connection method
(1), connect the computer with the development board with the USB cable.
(2), re-enhancing the boot0 with 3V3, Boot1 is connected to GND, and the RXD is connected to A9, and the TXD is connected to the A10.

2, serial communication program
Features:
1) Continue to output "Hello World!" To the serial port;
2) When receiving "STOP!", The output is stopped.
Code:

int flag=1;   
char Stop[]="stop\n";
void setup() {
//initialization
pinMode(PB0, OUTPUT);// PB0 is green, PB1 is blue, PB5 is red, can be changed as needed
Serial.begin(115200);
}
void loop() {
int i=0,flag_s=0;
char inByte[50];
digitalWrite(PB0, HIGH); // small light
delay(500); // delay
digitalWrite(PB0, LOW); // small light
delay(500); // delay
while (Serial.available()> 0)     // When the transmission buffer has data
{
        inByte[i] = Serial.read();    / / Remove and read a BYTE data from the buffer of the serial port
        delay(10); 
        i++ ;                              
}
if(Stop[i]=inByte[i])
{
  if(Stop[i-1]==inByte[i-1]&&Stop[i-2]==inByte[i-2]&&Stop[i-3]==inByte[i-3])
  {
  flag=0;
  Serial.println("Roger that!");
  }// Stop and reply when you receive the STOP command
}
if(flag==1)
{  
Serial.println("Hello World!");/ / Send data to the serial port
delay(100); // delay
}
}

3, configuration. Point open tool configuration as shown

4, compile, upload. Click on the verification in the upper left corner, upload
5, open the serial number monitor

Enter STOP stop sending

to sum up

1. In the serial port communication, if you accept garbled, you can try to modify the baud rate.
2, must pay attention to various configurations, otherwise it will be wrong.