智能车制作

标题: STM32的I2C问题 [打印本页]

作者: mxmvip 时间: 2011-5-23 08:46
标题: STM32的I2C问题
通过I2C对C3088的寄存器进行配置，读设备地址为0xc0,写地址为0xc1，现在得不到我想要的结果，我想看看寄存器配置成功没有就写了个通过I2C读寄存器的函数，当我调用读寄存器的函数时就检测不到总线空闲的标志，一直处于忙的状态，不知道是怎么回事
代码如下：
void I2C_Configuration(void)
{
  I2C_InitTypeDef I2C_InitStructure;
  I2C_Cmd(I2C1, ENABLE);
  /* I2C1 Init */
  //===========================
I2C_DeInit(I2C1);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; //设置I2C为I2C模式
  //===========================
  //I2C_InitStructure.I2C_Mode = I2C_Mode_SMBusHost;
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C_InitStructure.I2C_OwnAddress1 = 0x00;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;                //有应答的通信
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_ClockSpeed = 100000;
  I2C_Init(I2C1, &I2C_InitStructure);

  //===============================
/*允许1字节1应答模式*/
I2C_AcknowledgeConfig(I2C1, ENABLE);
  //===============================
}
void I2C_C3088_ConfReg_Write(u8 Reg_Addr,u8 RegValue)
{
  /*----- Transmission Phase -----*/

  while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY)!=RESET); //只有BUSY = 0 时, 可以发送开始位
  /* Send I2C1 START condition */
  I2C_GenerateSTART(I2C1, ENABLE);

  /* Test on I2C1 EV5 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))  /* EV5 */
  {
  }

  /* Send C3088 slave address for write */
  I2C_Send7bitAddress(I2C1, C3088_Addr, I2C_Direction_Transmitter);

  /* Test on I2C1 EV6 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) /* EV6 */
  {
  }
  /* Send the configuration register data pointer */
  I2C_SendData(I2C1, Reg_Addr);

  /* Test on I2C1 EV8 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
  {
  }

  /* Send I2C1 data */
  I2C_SendData(I2C1, RegValue);

  /* Test on I2C1 EV8 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
  {
  }

  /* Send I2C1 STOP Condition */
  I2C_GenerateSTOP(I2C1, ENABLE);
}
u8 I2C_C3088_ConfReg_Read(u8 Reg_Addr)
{
  u8 RegValue = 0;

  /*----- Transmission Phase -----*/
  while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY)!=RESET); //只有BUSY = 0 时, 可以发送开始位
  //=================================
  /*允许1字节1应答模式*/
  I2C_AcknowledgeConfig(I2C1, ENABLE);
  //==============================
  /* Send I2C1 START condition */
  I2C_GenerateSTART(I2C1, ENABLE);

  /* Test on I2C1 EV5 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))  /* EV5 */
  {
  }
  //===========================
  /* Send c3088 read address for write */
  I2C_Send7bitAddress(I2C1, C3088_Addr, I2C_Direction_Transmitter);
  //===========================
  /* Test on I2C1 EV6 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) /* EV6 */
  {
  }

  /* Send the configuration register data pointer */
  I2C_SendData(I2C1, Reg_Addr);

  /* Test on I2C1 EV8 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
  {
  }

  /*----- Reception Phase -----*/
  //while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY)!=RESET); //只有BUSY = 0 时, 可以发送开始位
  /* Send Re-STRAT condition */
  I2C_GenerateSTART(I2C1, ENABLE);

  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))  /* EV5 */
  {
  }

  /* Send STLM75 slave address for read */
  I2C_Send7bitAddress(I2C1, C3088_Addr_read, I2C_Direction_Receiver);

  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))  /* EV6 */
  {
  }

  /* Disable I2C1 acknowledgement */
  I2C_AcknowledgeConfig(I2C1, DISABLE);

  /* Send I2C1 STOP Condition */
  I2C_GenerateSTOP(I2C1, ENABLE);

  /* Test on EV7 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))  /* EV7 */
  {
  }

  /* Store I2C1 received data */
  RegValue = I2C_ReceiveData(I2C1);
  //=================================
  I2C_AcknowledgeConfig(I2C1, ENABLE);
  //=================================
  /* Return configuration register value */
  return (RegValue);
}

作者: mxmvip 时间: 2011-5-24 09:45
为什么看不见别人的回复呢？？？？气死了！

作者: mxmvip 时间: 2011-5-26 11:17
这个问题已经解决了，我的从设备其实是用的SCCB总线，它跟I2C是差不多的，有两个地方有点区别：
1.SCCB总线通信协议只支持100Kb/s或400Kb/s的传输速度
2.SCCB在读时，需要再增加一个总线停止条件

欢迎光临智能车制作 (http://111.231.132.190/)