stm32F103用IIC读写EEPROM读写不对

hss123 · 发表于 2020-11-4 16:41:08

本帖最后由 hss123 于 2020-11-4 16:43 编辑

用IIC读写EEPROM，不知道是没写进去，还是什么原因，每次读到的都是0xFF,用逻辑分析仪看时序好像也没有什么问题，eeprom没有写保护（WP低电平）
代码如下：
/** ****************************************************************************
* @brief 初始化I2C的gpio SCL SDA复用引脚配置
* @param hi2c I2C结构体指针
* @return GPIO初始化结果
*******************************************************************************/
static int I2cGpioInit(I2C_Device *i2c)
{

if(I2C1 == i2c->i2cx)
{
      GpioInit2AfOd(IIC1_SCL, GPIO_AF_PP_PULLUP);
      GpioInit2AfOd(IIC1_SDA, GPIO_AF_PP_PULLUP);

      // __HAL_RCC_I2C1_FORCE_RESET();
      // __HAL_RCC_I2C1_RELEASE_RESET();
}
else if(I2C2 == i2c->i2cx)
{
      GpioInit2AfOd(IIC2_SCL, GPIO_AF_PP_PULLUP); //开漏
      GpioInit2AfOd(IIC2_SDA, GPIO_AF_PP_PULLUP);

      // __HAL_RCC_I2C2_FORCE_RESET();
      // __HAL_RCC_I2C2_RELEASE_RESET();

}
else
{
      I2C_DEBUG("I2C prot not define!");
      return I2C_NULL;
}

return  I2C_OK;
}

/** ****************************************************************************
* @brief I2C工作模式配置
* @param i2c I2C结构体指针
* @return 配置结果
*******************************************************************************/
static int32_t I2cModeCfg(I2C_Device *i2c)
{

i2c->hi2c.Instance = i2c->i2cx;
i2c->hi2c.Init.AddressingMode  = I2C_ADDRESSINGMODE_7BIT;
i2c->hi2c.Init.ClockSpeed    = 100000;
i2c->hi2c.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
i2c->hi2c.Init.DutyCycle    = I2C_DUTYCYCLE_2;
i2c->hi2c.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
i2c->hi2c.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
i2c->hi2c.Init.OwnAddress1    = 0x0A ;
i2c->hi2c.Init.OwnAddress2    = 0;

if(HAL_I2C_Init(&i2c->hi2c) != HAL_OK)             //初始化I2C
{
      SPI_DEBUG("I2C init error!");
      return I2C_ERROR_INIT;
}

return I2C_OK;
}

/** ****************************************************************************
* @brief IIC初始化
* @param i2c I2C结构体指针
* @param i2cx: 取值I2C1/I2C2
* @return 初始化结果
*******************************************************************************/
int32_t I2cInit(I2C_Device *i2c, I2C_TypeDef* i2cx)
{
i2c->i2cx = i2cx;
I2cGpioInit(i2c);

if(I2C1 == i2c->i2cx)
{
      __HAL_RCC_I2C1_CLK_ENABLE();
}
else if(I2C2 == i2c->i2cx)
{
      __HAL_RCC_I2C2_CLK_ENABLE();
}
else
{
      I2C_DEBUG("I2C prot not define!");
      return I2C_NULL;
}

I2cModeCfg(i2c);

return I2C_OK;
}

/** ****************************************************************************
* @brief IIC写数据到EEPROM
* @param buf 写入数据buffer指针
* @param addr 写地址
* @param num  写的字节数
* @return 写状态
*******************************************************************************/
uint32_t I2cWrite(I2C_Device* i2c, uint8_t* buf, uint16_t addr, uint16_t num)
{
HAL_StatusTypeDef status = HAL_OK;

status = HAL_I2C_Mem_Write(&i2c->hi2c, ((EEPROM_W_ADDRESS & 0x14) | 0xA0), addr, I2C_MEMADD_SIZE_8BIT, buf, num, 100);

/* Check the communication status */
if(status != HAL_OK)
{
/* Execute user timeout callback */
//I2Cx_Error(Addr);
}
while (HAL_I2C_GetState(&i2c->hi2c) != HAL_I2C_STATE_READY)
{

}

/* Check if the EEPROM is ready for a new operation */
while (HAL_I2C_IsDeviceReady(&(i2c->hi2c), ((EEPROM_W_ADDRESS & 0x14) | 0xA0), EEPROM_MAX_TRIALS, I2Cx_TIMEOUT_MAX) == HAL_TIMEOUT);

/* Wait for the end of the transfer */
while (HAL_I2C_GetState(&i2c->hi2c) != HAL_I2C_STATE_READY)
{

}
return status;

}

/** ****************************************************************************
* @brief IIC读EEPROM数据
* @param buf 存放数据buffer指针
* @param addr 读地址
* @param num  读的字节数
* @return 读状态
*******************************************************************************/
int32_t I2cRead(I2C_Device *i2c, uint8_t* buf, uint16_t addr, uint16_t num)
{
if(HAL_I2C_Mem_Read(&i2c->hi2c, ((EEPROM_W_ADDRESS & 0x14) | 0xA0), addr, I2C_MEMADD_SIZE_8BIT, buf, num, 100) != HAL_OK)
{
      return I2C_ERR;
}
else
{
      return I2C_OK;
}

}

// 测试函数
I2C_Device  i2c;
#define  DATA_Size       256
#define  EEP_Firstpage    0x10
uint8_t Write[DATA_Size];
uint8_t Read[DATA_Size];
int8_t I2cTest(void* argc,void*argv[])
{
int i = shellExtParsePara(&UartShell,argv[1]);
int j = shellExtParsePara(&UartShell,argv[2]);

if(i == 1)
{
      I2cInit(&i2c, I2C1);
}
else
{
      I2cInit(&i2c, I2C2);

}

//    for(int16_t i=0; i<DATA_Size; i++ )
//  {
//       Write =i+1;
// //    printf("0x%02X ", Write);
// //    if(i%16 == 15)
// //    printf("\n\r");
//  }
Write[0] = 5;
if((j == 1) || (j == 3))
{
   I2cWrite(&i2c, Write, EEP_Firstpage, 1);
}

// I2C_EE_BufferWrite(&i2c, Write, EEP_Firstpage, DATA_Size);
delay_ms(10);
if((j == 2 ) || (j == 3))
{
      I2cRead(&i2c, Read, EEP_Firstpage, 1);
}

for (int16_t i=0; i<DATA_Size; i++)
{
      if(Read[i] != Write[i])
      {
         printf("eeprom error\r\n");
         printf("0x%02X ", Read[i]);
         return 0;
      }
      printf("0x%02X ", Read[i]);
      if(i%16 == 15)
      printf("\n\r");
}

}
SHELL_EXPORT_CMD(i2ctest, I2cTest, I2cTest);

#define EEPROM_W_ADDRESS       0xA0
#define EEPROM_R_ADDRESS       0xA1

再放两张逻辑分析仪的时序
[img]file:///C:\Users\acer\Documents\Tencent Files\787820739\Image\Group2\U}\0%\U}0%G8GZ~9332UGW[06_UF5.png[/img]file:///C:\Users\acer\Documents\Tencent Files\787820739\Image\Group2\B3\~X\B3~X98U3FFER]9HSF5A6~FW.png