STM32L151这个芯片进行I2C通信

labi41 提问时间：2013-11-27 15:48 /

项目中使用的STM32L151这个芯片进行I2C通信总是不稳定,用使用过的吗？能帮我分析一下，谢谢。

现在的问题时：现在读数据是很多时候停在了while(!I2C_CheckEvent(sEE_I2C,  I2C_EVENT_MASTER_MODE_SELECT))这个位置。

有的时候还继续运行下去。

读取的数据只有一个字节，如果读取2个字节，第二个字节都是00。

void I2C_Init(void)
{
GPIO_InitTypeDef   GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;

/*!<  sEE_I2C Periph clock enable */
RCC_APB1PeriphClockCmd(sEE_I2C_CLK,  ENABLE);

/*!< sEE_I2C_SCL_GPIO_CLK and sEE_I2C_SDA_GPIO_CLK Periph  clock enable */
RCC_AHBPeriphClockCmd(sEE_I2C_SCL_GPIO_CLK |  sEE_I2C_SDA_GPIO_CLK, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

/*  Reset sEE_I2C peripheral */
RCC_APB1PeriphResetCmd(sEE_I2C_CLK,  ENABLE);

/* Release reset signal of sEE_I2C IP */
   RCC_APB1PeriphResetCmd(sEE_I2C_CLK, DISABLE);

/*!< GPIO  configuration */
/* Connect PXx to I2C_SCL*/
   GPIO_PinAFConfig(sEE_I2C_SCL_GPIO_PORT, sEE_I2C_SCL_SOURCE,  sEE_I2C_SCL_AF);
/* Connect PXx to I2C_SDA*/
GPIO_PinAFConfig(sEE_I2C_SDA_GPIO_PORT,  sEE_I2C_SDA_SOURCE, sEE_I2C_SDA_AF);
/*!< Configure sEE_I2C pins: SCL */
   GPIO_InitStructure.GPIO_Pin = sEE_I2C_SCL_PIN;
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
   GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
   GPIO_Init(sEE_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
/*!< Configure sEE_I2C pins: SDA */
GPIO_InitStructure.GPIO_Pin =  sEE_I2C_SDA_PIN;
GPIO_Init(sEE_I2C_SDA_GPIO_PORT,  &GPIO_InitStructure);

/*!< I2C configuration  */
/* sEE_I2C configuration */
I2C_InitStructure.I2C_Mode =  I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
   I2C_InitStructure.I2C_OwnAddress1 = I2C_SLAVE_ADDRESS7;
   I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
   I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
   I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;

/* sEE_I2C Peripheral  Enable */
I2C_Cmd(sEE_I2C, ENABLE);
/* Apply sEE_I2C configuration  after enabling it */
I2C_Init(sEE_I2C, &I2C_InitStructure);
//   /* Enable the sEE_I2C peripheral DMA requests */
//    I2C_DMACmd(sEE_I2C, ENABLE);
}

uint8_t I2C_ReadNByte (uint8_t sla, uint32_t suba, uint8_t *s, uint32_t  num)
{
sEETimeout = sEE_FLAG_TIMEOUT;
while(I2C_GetFlagStatus(I2C2,  I2C_FLAG_BUSY))
{
    if((sEETimeout--) == 0) return sEE_FAIL;
   }

I2C_GenerateSTART(sEE_I2C,  ENABLE);//------------------------------------------------------------

sEETimeout = sEE_FLAG_TIMEOUT;
while(!I2C_CheckEvent(sEE_I2C,  I2C_EVENT_MASTER_MODE_SELECT))
{
    if((sEETimeout--) == 0) return  sEE_FAIL;
}

   I2C_Send7bitAddress(sEE_I2C, sla,  I2C_Direction_Transmitter);//----------------------------------------------
/*!< Test on EV6 and clear it */
sEETimeout =  sEE_FLAG_TIMEOUT;
while(!I2C_CheckEvent(sEE_I2C,  I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
    if((sEETimeout--) ==  0) return sEE_FAIL;
}
I2C_Cmd(I2C2, ENABLE);

   I2C_SendData(sEE_I2C, suba);               //-----------------------------

sEETimeout =  sEE_FLAG_TIMEOUT;
while(I2C_GetFlagStatus(sEE_I2C,  I2C_EVENT_MASTER_BYTE_TRANSMITTED) == RESET)
{
    if((sEETimeout--) ==  0) return sEE_FAIL;
}

I2C_GenerateSTART(sEE_I2C,  ENABLE);   //---------------------------------------------------

sEETimeout = sEE_FLAG_TIMEOUT;
while(!I2C_CheckEvent(sEE_I2C,  I2C_EVENT_MASTER_MODE_SELECT))
{
    if((sEETimeout--) == 0) return  sEE_FAIL;
}

   I2C_Send7bitAddress(sEE_I2C, sla+1, I2C_Direction_Receiver);   //-----------------------------------

sEETimeout =  sEE_FLAG_TIMEOUT;
while(I2C_GetFlagStatus(sEE_I2C,  I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == RESET)
{
  if((sEETimeout--)  == 0) return sEE_FAIL;
}

I2C_AcknowledgeConfig(sEE_I2C, DISABLE);

(void)sEE_I2C->SR2;

I2C_GenerateSTOP(I2C2,  ENABLE);

sEETimeout =  sEE_FLAG_TIMEOUT;
while(I2C_GetFlagStatus(sEE_I2C,  I2C_EVENT_MASTER_BYTE_RECEIVED) == RESET)
{
  if((sEETimeout--) == 0)  return sEE_FAIL;
}

do
{

    *s = I2C_ReceiveData(sEE_I2C);

    num--;

    sEETimeout  = sEE_FLAG_TIMEOUT;
    while(sEE_I2C->CR1 & I2C_CR1_STOP)
     {
      if((sEETimeout--) == 0) return sEE_FAIL;
    }

   }while(num!=0);

  I2C_AcknowledgeConfig(I2C2, ENABLE);
(void)sEE_I2C->SR2;

return sEE_OK;
}