（二）STM32开发例程

1控制LED和继电器

除了 PA11和PA12其他都可以

void setup() {
 
  pinMode(PC13, OUTPUT);
  pinMode(PC14, OUTPUT);
  pinMode(PC15, OUTPUT);
 
  pinMode(PA0, OUTPUT);
  pinMode(PA1, OUTPUT);
  pinMode(PA2, OUTPUT);
  pinMode(PA3, OUTPUT);
  pinMode(PA4, OUTPUT);
  pinMode(PA5, OUTPUT);
  pinMode(PA6, OUTPUT);
  pinMode(PA7, OUTPUT);
  pinMode(PA8, OUTPUT);
  pinMode(PA9, OUTPUT);
  pinMode(PA10, OUTPUT);
//  pinMode(PA11, OUTPUT);  // CAN t0  不能用
//  pinMode(PA12, OUTPUT);  // CAN r0  不能用
  pinMode(PA15, OUTPUT);
 
  pinMode(PB0, OUTPUT);
  pinMode(PB1, OUTPUT);
  pinMode(PB2, OUTPUT);
  pinMode(PB3, OUTPUT);
  pinMode(PB4, OUTPUT);
  pinMode(PB5, OUTPUT);
  pinMode(PB6, OUTPUT);
  pinMode(PB7, OUTPUT);
  pinMode(PB8, OUTPUT);
  pinMode(PB9, OUTPUT);
  pinMode(PB10, OUTPUT);
  pinMode(PB11, OUTPUT);
  pinMode(PB12, OUTPUT);
  pinMode(PB13, OUTPUT);
  pinMode(PB14, OUTPUT);
  pinMode(PB15, OUTPUT);
 
}
 
void loop() {
  digitalWrite(PC13, HIGH);
  digitalWrite(PC14, HIGH);
  digitalWrite(PC15, HIGH);  
 
  digitalWrite(PA0, HIGH);
  digitalWrite(PA1, HIGH);
  digitalWrite(PA2, HIGH);
  digitalWrite(PA3, HIGH);
  digitalWrite(PA4, HIGH);
  digitalWrite(PA5, HIGH);
  digitalWrite(PA6, HIGH);
  digitalWrite(PA7, HIGH);
  digitalWrite(PA8, HIGH);
  digitalWrite(PA9, HIGH);
  digitalWrite(PA10, HIGH);
 // digitalWrite(PA11, HIGH);
 // digitalWrite(PA12, HIGH);
  digitalWrite(PA15, HIGH);  
 
  digitalWrite(PB0, HIGH);
  digitalWrite(PB1, HIGH);
  digitalWrite(PB2, HIGH);
  digitalWrite(PB3, HIGH);
  digitalWrite(PB4, HIGH);
  digitalWrite(PB5, HIGH);
  digitalWrite(PB6, HIGH);
  digitalWrite(PB7, HIGH);
  digitalWrite(PB8, HIGH);
  digitalWrite(PB9, HIGH);
  digitalWrite(PB10, HIGH);
  digitalWrite(PB11, HIGH);
  digitalWrite(PB12, HIGH);
  digitalWrite(PB13, HIGH);
  digitalWrite(PB14, HIGH);
  digitalWrite(PB15, HIGH);    
 
  delay(1000);              
 
  digitalWrite(PC13, LOW);
  digitalWrite(PC14, LOW);
  digitalWrite(PC15, LOW);  
 
  digitalWrite(PA0, LOW);
  digitalWrite(PA1, LOW);
  digitalWrite(PA2, LOW);
  digitalWrite(PA3, LOW);
  digitalWrite(PA4, LOW);
  digitalWrite(PA5, LOW);
  digitalWrite(PA6, LOW);
  digitalWrite(PA7, LOW);
  digitalWrite(PA8, LOW);
  digitalWrite(PA9, LOW);
  digitalWrite(PA10, LOW);
 // digitalWrite(PA11, LOW);
 // digitalWrite(PA12, LOW);
  digitalWrite(PA15, LOW);   
 
  digitalWrite(PB0, LOW);
  digitalWrite(PB1, LOW);
  digitalWrite(PB2, LOW);
  digitalWrite(PB3, LOW);
  digitalWrite(PB4, LOW);
  digitalWrite(PB5, LOW);
  digitalWrite(PB6, LOW);
  digitalWrite(PB7, LOW);
  digitalWrite(PB8, LOW);
  digitalWrite(PB9, LOW);
  digitalWrite(PB10, LOW);
  digitalWrite(PB11, LOW);
  digitalWrite(PB12, LOW);
  digitalWrite(PB13, LOW);
  digitalWrite(PB14, LOW);
  digitalWrite(PB15, LOW);    
 
  delay(1000);
}

　　

2 PWM控制

PWM引脚简易测试程序,总共有12个PWM引脚，16bit即65536级PWM，很精密了：

延迟给100微妙 多了少了都有问题，不正常转

void setup()
{
        pinMode(PB0, PWM);
        pinMode(PA7, PWM);
        pinMode(PA6, PWM);
        pinMode(PA3, PWM);
        pinMode(PA2, PWM);
        pinMode(PA1, PWM);
        pinMode(PA0, PWM);
        pinMode(PB7, PWM);
        pinMode(PB6, PWM);
        pinMode(PA10, PWM);
        pinMode(PA9, PWM);
        pinMode(PA8, PWM);
}
void loop()
{
        for (int i = 1000; i < 65536; i++)
        {
                //delayMicroseconds(100);
              //  delay(1);
                  delay(20);
                pwmWrite(PB0, i);
                pwmWrite(PA7, i);
                pwmWrite(PA6, i);
                pwmWrite(PA3, i);
                pwmWrite(PA2, i);
                pwmWrite(PA1, i);
                pwmWrite(PA0, i);
                pwmWrite(PB7, i);
                pwmWrite(PB6, i);
                pwmWrite(PA10, i);
                pwmWrite(PA9, i);
                pwmWrite(PA8, i);
        }
         for (int i = 65536; i > 1000; i--)
        {
               // delayMicroseconds(100);
              //  delay(1);
                  delay(20);
                pwmWrite(PB0, i);
                pwmWrite(PA7, i);
                pwmWrite(PA6, i);
                pwmWrite(PA3, i);
                pwmWrite(PA2, i);
                pwmWrite(PA1, i);
                pwmWrite(PA0, i);
                pwmWrite(PB7, i);
                pwmWrite(PB6, i);
                pwmWrite(PA10, i);
                pwmWrite(PA9, i);
                pwmWrite(PA8, i);
        }
}

　　

int pins[12] = {0, 1, 2, 3, 6, 7, 8, 9, 10, 16, 22, 23};
void setup()
{
  for (int i = 0; i < 12; i++)
  {
    pinMode(pins[i], PWM);
  }
}
void loop()
{
  for (int i = 0; i < 100; i++)
  {
    for (int j = 0; j < 12; j++)
    {
      pwmWrite(pins[j], i * i);
    }
    delay(20);
  }
}

　

IO引脚读取

int value = digitalRead(pin);

ADC引脚

实际测试  0-4096  2的10次方

　

在pa7接一个光敏电阻，完全遮盖4095  手机强光基本几十

void setup()
{
  Serial.begin(115200);
  pinMode(PB0, INPUT_ANALOG);
  pinMode(PA7, INPUT_ANALOG);
  pinMode(PA6, INPUT_ANALOG);
  pinMode(PA5, INPUT_ANALOG);
  pinMode(PA4, INPUT_ANALOG);
  pinMode(PA3, INPUT_ANALOG);
  pinMode(PA2, INPUT_ANALOG);
  pinMode(PA1, INPUT_ANALOG);
  pinMode(PA0, INPUT_ANALOG);
  pinMode(PB1, INPUT_ANALOG);
}
void loop()
{
  delay(50);
  Serial.print("\tPB0="); Serial.print(analogRead(PB0));
  Serial.print("\tPA7="); Serial.print(analogRead(PA7));
  Serial.print("\tPA6="); Serial.print(analogRead(PA6));
  Serial.print("\tPA5="); Serial.print(analogRead(PA5));
  Serial.print("\tPA4="); Serial.print(analogRead(PA4));
  Serial.print("\tPA3="); Serial.print(analogRead(PA3));
  Serial.print("\tPA2="); Serial.print(analogRead(PA2));
  Serial.print("\tPA1="); Serial.print(analogRead(PA1));
  Serial.print("\tPA0="); Serial.print(analogRead(PA0));
  Serial.print("\tPB1="); Serial.println(analogRead(PB1));
}

　　

中断

　　
void onChange()
{
   if ( digitalRead(PA8) == LOW )
      Serial.println("Key Down");
   else
      Serial.println("Key UP");
}
 
void setup()
{
   Serial.begin(9600); //打开串口
 
   pinMode( PA8, INPUT);//设置管脚为输入
 
   //Enable中断管脚, 中断服务程序为onChange(), 监视引脚变化
 /*
LOW                  低电平触发
CHANGE            电平变化，高电平变低电平、低电平变高电平
RISING              上升沿触发
FALLING            下降沿触发
HIGH                 高电平触发(该中断模式仅适用于Arduino due)
 */
   attachInterrupt( PA8, onChange, CHANGE);
}
 
void loop()
{
  // 模拟长时间运行的进程或复杂的任务。
  for (int i = 0; i < 100; i++)
  {
    // 什么都不做，等待10毫秒
    delay(10);
  }
}

　　

允许的串口

总共3个硬件外接串口Serial1、Serial2、Serial3，一个USB虚拟串口Serial：

void setup()
{
  Serial.begin(115200);
  Serial1.begin(115200);  //TX=PA9,RX=PA10
  Serial2.begin(115200);  //TX=PA2,RX=PA3
  Serial3.begin(115200);  //TX=PB10,RX=PB11
}
void loop()
{
  delay(100);
  Serial.println("Test Serial");
  Serial1.println("Test Serial1");
  Serial2.println("Test Serial2");
  Serial3.println("Test Serial3");
}