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定时器中断方式：
      基于定时器查询方式实验上，实现走马灯效果。
在TIM2初始化代码：
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_InitTypeDef.TIM_Prescaler = 7200;     
TIM_InitTypeDef.TIM_CounterMode = TIM_CounterMode_Up;
TIM_InitTypeDef.TIM_Period = 5000;                    
TIM_InitTypeDef.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_InitTypeDef.TIM_RepetitionCounter = 0;    
TIM_TimeBaseInit(TIM2, &TIM_InitTypeDef);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);        //打开更新中断
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
TIM_Cmd(TIM2, ENABLE);

中断控制器初始化：
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//强占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //次优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //通道中断使能
NVIC_Init(&NVIC_InitStructure);       //初始化中断

24C02读写实验：
      向24C02的00H到13H地址写入0x0~0x13，然后读出，通过串口输出到终端。
初始化代码：
 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
 GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_6; 
 GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_OD;     //复用开漏输出
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_Init(GPIOB, &GPIO_InitStructure);

 GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_7; 
 GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_OD;     //复用开漏输出
 GPIO_Init(GPIOB, &GPIO_InitStructure);

 GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_5; 
 GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_Out_PP;     //复用开漏输出
 GPIO_Init(GPIOB, &GPIO_InitStructure);
 GPIO_ResetBits(GPIOB,GPIO_Pin_5);
 I2C_DeInit(I2C1);
 I2C1_InitStruct.I2C_Mode = I2C_Mode_I2C;
 I2C1_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2;
 I2C1_InitStruct.I2C_OwnAddress1 = 0x30;
 I2C1_InitStruct.I2C_Ack = I2C_Ack_Enable;
 I2C1_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
 I2C1_InitStruct.I2C_ClockSpeed = 200000;
 I2C_Cmd(I2C1,ENABLE);
 I2C_Init(I2C1, &I2C1_InitStruct);
 I2C_AcknowledgeConfig(I2C1,ENABLE); 

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