昨天晚上回去翻箱倒柜终于找到了代码，贴出部分代码跟大家分享，欢迎指正：
void i2c_init(void)
{
 I2C_InitTypeDef I2C_InitStructure;
 I2C_DeInit(I2C2);
 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
 I2C_InitStructure.I2C_OwnAddress1 = 0x0002;
 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
 I2C_InitStructure.I2C_ClockSpeed = 400000;
 I2C_Init(I2C2, &I2C_InitStructure);
 //研究库代码发现I2C_Init函数执行后I2C就已经使能了，所以无需I2C_Cmd(I2C2, ENABLE)
 
 I2C_ITConfig(I2C2, I2C_IT_EVT|I2C_IT_ERR, ENABLE);
}

void c02_write_data(u8 address, u8 data0,u8 data1,u8 data2,u8 data3,u8 data4,u8 data5,u8 data6,u8 data7)
{
 while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));
 
 c02_direction = c02_write;
 c02_address = address;
 c02_data_w[0]=data0; c02_data_w[1]=data1; c02_data_w[2]=data2; c02_data_w[3]=data3;
 c02_data_w[4]=data4; c02_data_w[5]=data5; c02_data_w[6]=data6; c02_data_w[7]=data7;
 i2c_plan = 0;
 I2C_GenerateSTART(I2C2, ENABLE);
 
 while(i2c_plan!=20);
 while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));
 delay_ms(5);
}

void c02_read_data(u8 address)
{
 while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));
 
 c02_direction = c02_read;
 c02_address = address;
 i2c_plan = 0;
 I2C_GenerateSTART(I2C2, ENABLE);
 
}


void I2C2_EV_IRQHandler(void)
{
 
 switch(i2c_plan)
 {
  case  0:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_SB))//ev5
          {
           I2C_Send7bitAddress(I2C2, 0xA0, I2C_Direction_Transmitter); i2c_plan=1;//address+w
          }
          break;
  case  1:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_ADDR))//ev6
          {
           if(I2C_GetFlagStatus(I2C2, I2C_FLAG_TRA)){I2C_SendData(I2C2, c02_address); i2c_plan=2;}
          }
          break;
  case  2:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev8
          {
           if(c02_direction==c02_write){I2C_SendData(I2C2, c02_data_w[0]); i2c_plan=3;}//write data0
           else{I2C_GenerateSTART(I2C2, ENABLE); i2c_plan=11;}
          }
          break;
/******************************************************************************/
  case  3:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev8
          {
           I2C_SendData(I2C2, c02_data_w[1]); i2c_plan=4;//write data1
          }
          break;
  case  4:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev8
          {
           I2C_SendData(I2C2, c02_data_w[2]); i2c_plan=5;//write data2
          }
          break;
  case  5:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev8
          {
           I2C_SendData(I2C2, c02_data_w[3]); i2c_plan=6;//write data3
          }
          break;
  case  6:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev8
          {
           I2C_SendData(I2C2, c02_data_w[4]); i2c_plan=7;//write data4
          }
          break;
  case  7:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev8
          {
           I2C_SendData(I2C2, c02_data_w[5]); i2c_plan=8;//write data5
          }
          break;
  case  8:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev8
          {
           I2C_SendData(I2C2, c02_data_w[6]); i2c_plan=9;//write data6
          }
          break;
  case  9:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev8
          {
           I2C_SendData(I2C2, c02_data_w[7]); i2c_plan=10;//write data7
          }
          break;
  case 10:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev8_2
          {
           I2C_GenerateSTOP(I2C2, ENABLE);
           i2c_plan=20;
          }
          break;
/******************************************************************************/
  case 11:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_SB))//ev5
          {
           I2C_Send7bitAddress(I2C2, 0xA0, I2C_Direction_Receiver); i2c_plan=12;//address+r
          }
          break;
  case 12:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_ADDR))//ev6
          {
           if(!I2C_GetFlagStatus(I2C2, I2C_FLAG_TRA)) i2c_plan=13;
          }
          break;
  case 13:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev7
          {
           c02_data_r[0] = I2C_ReceiveData(I2C2); i2c_plan=14;//read data0
          }
          break;
  case 14:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev7
          {
           c02_data_r[1] = I2C_ReceiveData(I2C2); i2c_plan=15;//read data1
          }
          break;
  case 15:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev7
          {
           c02_data_r[2] = I2C_ReceiveData(I2C2); i2c_plan=16;//read data2
          }
          break;
  case 16:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev7
          {
           c02_data_r[3] = I2C_ReceiveData(I2C2); i2c_plan=17;//read data3
          }
          break;
  case 17:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev7
          {
           c02_data_r[4] = I2C_ReceiveData(I2C2); i2c_plan=18;//read data4
          }
          break;
  case 18:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev7
          {
           I2C_AcknowledgeConfig(I2C2, DISABLE);
           
           c02_data_r[5] = I2C_ReceiveData(I2C2); i2c_plan=19;//read data5
          }
          break;
  case 19:if(I2C_GetFlagStatus(I2C2, I2C_FLAG_BTF))//ev7
          {
           I2C_AcknowledgeConfig(I2C2, ENABLE);
           I2C_GenerateSTOP(I2C2, ENABLE);
           c02_data_r[6] = I2C_ReceiveData(I2C2);//read data6
           while(!I2C_GetFlagStatus(I2C2, I2C_FLAG_RXNE));
           c02_data_r[7] = I2C_ReceiveData(I2C2);//read data7
           i2c_plan=21;
          }
          break;
  
 }
 
}

当然main函数里面会调用24c02读或写函数去发送start信号