I2C-EEPROM的page读写为0xff

HTTazusa · 发表于 2021-12-30 19:34:14

用的是f103zet6和AT24C02

//相关的宏定义

#define IIC_APBxClkCmd                RCC_APB1PeriphClockCmd
#define IIC_GPIO_APBxCLKCmd       RCC_APB2PeriphClockCmd

#define IIC_SCL_GPIO_CLK          RCC_APB2Periph_GPIOB
#define IIC_SDA_GPIO_CLK          RCC_APB2Periph_GPIOB

#define EEPROM_I2C                      I2C1
#define IIC_CLK                            RCC_APB1Periph_I2C1
#define IIC_SCL_GPIO_PIN             GPIO_Pin_6
#define IIC_SDA_GPIO_Pin             GPIO_Pin_7#define IIC_SCL_GPIO_PORT          GPIOB
#define IIC_SDA_GPIO_PORT          GPIOB

#define IIC_ClockSpeed_Config       400000
#define IIC_OwnAddress_Config    0x5f
#define EEPROM_WRITE_ADDRESS             0xA0 //1010000 0
#define EEPROM_READ_ADDRESS             0xA1 //1010000 1

/**
  * @brief    I2C-EEPROM INIT
  * @param  N
  * @retval N
  */

static void IIC_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;

/********************************RCC******************************/
IIC_GPIO_APBxCLKCmd(IIC_SCL_GPIO_CLK | IIC_SDA_GPIO_CLK,ENABLE);    //GPIO
IIC_APBxClkCmd(IIC_CLK,ENABLE);                                                          //I2C

/********************************GPIO******************************/
GPIO_InitStructure.GPIO_Pin=IIC_SCL_GPIO_PIN;             //SCL,i2c1为PIN6
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_OD;
GPIO_Init(IIC_SCL_GPIO_PORT,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=IIC_SDA_GPIO_Pin;             //SDA,i2c1为PIN7 GPIO_Init(IIC_SDA_GPIO_PORT,&GPIO_InitStructure);

/********************************IIC******************************/
I2C_InitStructure.I2C_Ack                   = I2C_Ack_Enable;                         //ACK使能
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; //I2C寻址模式
I2C_InitStructure.I2C_ClockSpeed          = IIC_ClockSpeed_Config;                //通信速率
I2C_InitStructure.I2C_DutyCycle          = I2C_DutyCycle_2;                         //占空比
I2C_InitStructure.I2C_Mode                = I2C_Mode_I2C;                            //模式
I2C_InitStructure.I2C_OwnAddress1       = IIC_OwnAddress_Config;                //I2C设备自身地址
I2C_Init(EEPROM_I2C,&I2C_InitStructure);                                                 //初始化
I2C_Cmd(EEPROM_I2C,ENABLE);                                                             //使能,EEPROM_I2C==I2C1
}

/**
  * @brief  I2C-EEPROM page Write
  * @param  addr: EEPROM addr
  * @param  data: page address
  * @param  numByte: num of data(numByte<=8)
  * @retval none
  */

void EEPROM_Page_Write(uint8_t addr,uint8_t *data,uint8_t numByte)
{
      // 1  start writing
      I2C_GenerateSTART(EEPROM_I2C,ENABLE);
         while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_MODE_SELECT)==ERROR);                            //EV5


   // 2  device address
      I2C_Send7bitAddress(EEPROM_I2C,EEPROM_WRITE_ADDRESS,I2C_Direction_Transmitter);
         while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)==ERROR); //EV6

      // 3  word address
      I2C_SendData(EEPROM_I2C,addr);
         while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_BYTE_TRANSMITTING )==ERROR);       //EV8


      //  4  data
      while(numByte--)
      {
         I2C_SendData(EEPROM_I2C,*data);
            while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_BYTE_TRANSMITTING )==ERROR); //EV8
         data++;
      }

      // 5 Finish
      I2C_GenerateSTOP(EEPROM_I2C,ENABLE);

}

/**
  * @brief 从EEPROM接收数据
  * @param  addr: EEPROM addr
  * @param  *data: reading buffer addr
  * @retval N
  */
void EEPROM_Read(uint8_t addr,uint8_t *data,uint8_t dataNumByteRead)
{
// 1  start writing
I2C_GenerateSTART(EEPROM_I2C,ENABLE);
      while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_MODE_SELECT)==ERROR);                      //EV5

// 2  device address
I2C_Send7bitAddress(EEPROM_I2C,EEPROM_WRITE_ADDRESS,I2C_Direction_Transmitter);
      while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)==ERROR); //EV6

// 3  word address
I2C_SendData(EEPROM_I2C,addr);
      while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_BYTE_TRANSMITTING )==ERROR);          //EV7

// 4 strat reading
I2C_GenerateSTART(EEPROM_I2C,ENABLE);
      while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_MODE_SELECT)==ERROR);                         //EV5

// 5  device address
I2C_Send7bitAddress(EEPROM_I2C,EEPROM_READ_ADDRESS,I2C_Direction_Receiver);
      while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)==ERROR);       //EV6
// 6  receive data
      while(dataNumByteRead)
      {
         //如果是最后一个字节
         if(dataNumByteRead==1)
         {
            I2C_AcknowledgeConfig(EEPROM_I2C,DISABLE);
         }
         while(I2C_CheckEvent(EEPROM_I2C,I2C_EVENT_MASTER_BYTE_RECEIVED )==ERROR);             //EV7

         *data=I2C_ReceiveData(EEPROM_I2C);
         data++;
         dataNumByteRead--;
      }

I2C_GenerateSTOP(EEPROM_I2C,ENABLE);
}

uint8_t readData[8]={0};
uint8_t I2C_data[8]={1,2,3,4,5,6,7,8};

结果只能输出1，后面的数都是0xff

HTTazusa · 发表于 2021-12-30 19:39:12

补充：main函数在写之后加了个等待
void EEPROM_WaitForWriting(void)
{
do
{
I2C_GenerateSTART(EEPROM_I2C,ENABLE);
while(I2C_GetFlagStatus(EEPROM_I2C,I2C_FLAG_SB)==RESET); //EV5
I2C_Send7bitAddress(EEPROM_I2C,EEPROM_WRITE_ADDRESS,I2C_Direction_Transmitter); //write
}while(I2C_GetFlagStatus(EEPROM_I2C,I2C_FLAG_ADDR)==RESET); //EV6
I2C_GenerateSTOP(EEPROM_I2C,ENABLE);
}