学习stm32 hal库的工程文件 使用软件为IAR和stm32 cubeMx 学习顺序 LED //流水灯实验，实现GPIO的输出功能配置 Key_input //按键输入实验，实现GPIO输入功能配置 EXTI //外部中断实验，实现用外部输入中断的方式控制led TIM //定时器实验，实现配置时钟树和分频，利用定时器溢出中断控制闪烁 USART //串口读写实验，使用USART实现串口接收并发送的功能，寄存器溢出中断发送前十位数据，只能发送一次 PWM //定时器pwm输出实验，实现串口重映射下，循环输出pwm波，实现呼吸灯效果 IWDG //看门狗实验，低级看门狗中断 DMA //DMA数据传输实验，实现数据的发送和接收，性能较usart有所提高（常用） ADC //ADC转换，获取mcu内部温度传感器数据并打印
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