STM32G070RBT6基于Arduino框架GPIO外部中断

STM32G070RBT6基于Arduino框架GPIO外部中断

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📚外部中断线与IO引脚对应关系

📗STM32供IO使用的中断线只有16个，但是STM32G070RBT6系列的IO口多达59个,那么中断线怎么跟IO口对应上呢？下图就是STM32的外部中断线和IO口的对应关系：

• 📖对于每个中断线，我们可以设置相应的触发方式（上升沿触发，下降沿触发，边沿触发）以及使能。
• 🎈相关中断线在Arduino中定义在：C:\Users\Administrator\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.3.0\system\Drivers\STM32G0xx_HAL_Driver\Inc\stm32g0xx_ll_exti.h头文件中。

#define LL_EXTI_CONFIG_LINE0               ((0uL << LL_EXTI_REGISTER_PINPOS_SHFT)  | 0U)  /*!< EXTI_POSITION_0  | EXTICR[0] */
#define LL_EXTI_CONFIG_LINE1               ((8uL << LL_EXTI_REGISTER_PINPOS_SHFT)  | 0U)  /*!< EXTI_POSITION_8  | EXTICR[0] */
#define LL_EXTI_CONFIG_LINE2               ((16uL << LL_EXTI_REGISTER_PINPOS_SHFT) | 0U)  /*!< EXTI_POSITION_16 | EXTICR[0] */
#define LL_EXTI_CONFIG_LINE3               ((24uL << LL_EXTI_REGISTER_PINPOS_SHFT) | 0U)  /*!< EXTI_POSITION_24 | EXTICR[0] */
#define LL_EXTI_CONFIG_LINE4               ((0uL << LL_EXTI_REGISTER_PINPOS_SHFT)  | 1U)  /*!< EXTI_POSITION_0  | EXTICR[1] */
#define LL_EXTI_CONFIG_LINE5               ((8uL << LL_EXTI_REGISTER_PINPOS_SHFT)  | 1U)  /*!< EXTI_POSITION_8  | EXTICR[1] */
#define LL_EXTI_CONFIG_LINE6               ((16uL << LL_EXTI_REGISTER_PINPOS_SHFT) | 1U)  /*!< EXTI_POSITION_16 | EXTICR[1] */
#define LL_EXTI_CONFIG_LINE7               ((24uL << LL_EXTI_REGISTER_PINPOS_SHFT) | 1U)  /*!< EXTI_POSITION_24 | EXTICR[1] */
#define LL_EXTI_CONFIG_LINE8               ((0uL << LL_EXTI_REGISTER_PINPOS_SHFT)  | 2U)  /*!< EXTI_POSITION_0  | EXTICR[2] */
#define LL_EXTI_CONFIG_LINE9               ((8uL << LL_EXTI_REGISTER_PINPOS_SHFT)  | 2U)  /*!< EXTI_POSITION_8  | EXTICR[2] */
#define LL_EXTI_CONFIG_LINE10              ((16uL << LL_EXTI_REGISTER_PINPOS_SHFT) | 2U)  /*!< EXTI_POSITION_16 | EXTICR[2] */
#define LL_EXTI_CONFIG_LINE11              ((24uL << LL_EXTI_REGISTER_PINPOS_SHFT) | 2U)  /*!< EXTI_POSITION_24 | EXTICR[2] */
#define LL_EXTI_CONFIG_LINE12              ((0uL << LL_EXTI_REGISTER_PINPOS_SHFT)  | 3U)  /*!< EXTI_POSITION_0  | EXTICR[3] */
#define LL_EXTI_CONFIG_LINE13              ((8uL << LL_EXTI_REGISTER_PINPOS_SHFT)  | 3U)  /*!< EXTI_POSITION_8  | EXTICR[3] */
#define LL_EXTI_CONFIG_LINE14              ((16uL << LL_EXTI_REGISTER_PINPOS_SHFT) | 3U)  /*!< EXTI_POSITION_16 | EXTICR[3] */
#define LL_EXTI_CONFIG_LINE15              ((24uL << LL_EXTI_REGISTER_PINPOS_SHFT) | 3U)  /*!< EXTI_POSITION_24 | EXTICR[3] */
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📝触发模式

中断触发方式定义在：C:\Users\Administrator\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.3.0\cores\arduino\wiring_constants.h头文件当中。

#define LOW     0x0
#define HIGH    0x1
#define CHANGE  0x2
#define FALLING 0x3
#define RISING  0x4
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• HIGH:高电平触发。
• LOW:低电平触发
• CHANGE:当引脚改变值时触发中断-例如从HIGH到LOW或LOW到HIGH;
• FALLING:当触发信号从高电平到低电平是触发;
• RISING:当引脚从低电平到高电平时触发。

📑中断相关函数

> 相关中断线在Arduino中定义在：C:\Users\Administrator\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.3.0\cores\arduino\interrupt.h头文件当中。

stm32_interrupt_enable(GPIO_TypeDef *port, uint16_t pin, callback_function_t callback, uint32_t mode);
  void stm32_interrupt_enable(GPIO_TypeDef *port, uint16_t pin, void (*callback)(void), uint32_t mode);
  void stm32_interrupt_disable(GPIO_TypeDef *port, uint16_t pin);
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📢说明：以上两个函数在测试中编译没有问题，但是并没有触发中断。

• 📌文件位置：C:\Users\Administrator\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.3.0\cores\arduino\WInterrupts.h头文件当中。

void attachInterrupt(uint32_t pin, void (*callback)(void), uint32_t mode);//使能中断

void detachInterrupt(uint32_t pin);//取消中断
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📚中断示例

#define led1  PC2
#define led2  PC3


#define interruptPin1  PC0
#define interruptPin2  PC1

uint16_t Val_0 = 0; //设置变量Val_0，计数
uint16_t Val_1 = 0; //设置变量Val_1，计数


void count() {
 Val_0 += 1;
}

void count2() {
 Val_1 += 1;
}
// the setup function runs once when you press reset or power the board
void setup() {
  HardwareSerial(PA10, PA9);
  Serial.begin(115200);
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(led1, OUTPUT);
   pinMode(led2, OUTPUT);
   digitalWrite(led1, LOW);
   digitalWrite(led2, HIGH);
   pinMode(interruptPin1, INPUT_PULLUP);
   pinMode(interruptPin2, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(interruptPin1), count, FALLING);   //创建中断
attachInterrupt(digitalPinToInterrupt(interruptPin2), count2, FALLING);   //创建中断
//  LOW 当引脚为低电平时，触发中断
// HIGH 高电平触发
//CHANGE 当引脚电平发生改变时，触发中断
//RISING 当引脚由低电平变为高电平时，触发中断
//FALLING 当引脚由高电平变为低电平时，触发中断.
//   stm32_interrupt_enable(GPIOC, GPIO_PIN_0, count, FALLING);   //创建中断
//   stm32_interrupt_enable(GPIOC, GPIO_PIN_1, count2, FALLING);   //创建中断
}

// the loop function runs over and over again forever
void loop() {
 digitalToggleFast(PC_2);   // turn the LED on (HIGH is the voltage level)
  digitalToggle(led2);
  delay(1000);                       // wait for a second
//  Serial.println("Perseverance51");
  digitalWriteFast(PC_2, !digitalReadFast(PC_2)) ;   // turn the LED off by making the voltage LOW
  digitalWrite(led2, !digitalRead(led2)) ;
  delay(1000);                       // wait for a second
//  Serial.println("Arduino STM32G070RBT6");
  Serial.printf("count=%u,count2=%u \n",Val_0,Val_1);
}
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• 📜串口打印
  

✅可以设置多路外部中断，以及不同的触发方式，相比轮询方式，中断可以有效的节省主循环时间开销。