ST意法半导体中文论坛STM32F4 I2C 查询方式自发自收问题

lovelifett 发表于 2014-1-11 16:30:39

STM32F4 I2C 查询方式自发自收问题

本人菜鸟，初学STM32F4 在调试I2C程序时，用I2C1作为主发送，I2C2作为从接收，进行自发自收，可是程序一直卡在while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));上，一直找不出原因，求高手指导
以下是全部代码
#include"stm32F4xx.h"

void RCC_Configuration(void);
void GPIO_Configuration(void);
void I2C_Configuration(void);
void I2C_start(I2C_TypeDef* I2Cx, uint8_t address, uint8_t direction);
void I2C_write(I2C_TypeDef* I2Cx, uint8_t data);
uint8_t I2C_read_ack(I2C_TypeDef* I2Cx);
uint8_t I2C_read_nack(I2C_TypeDef* I2Cx);
void I2C_stop(I2C_TypeDef* I2Cx);
void Delay(int nCount);

int main(void)
{
RCC_Configuration();
GPIO_Configuration();
I2C_Configuration();
while(1)
{ int data=0;
I2C_start(I2C1,0x300;c2--);
};
}

fengye5340 发表于 2014-1-12 12:36:11

RE:STM32F4 I2C 查询方式自发自收问题

ST的IIC为了规避专利，采用了独特的设计，楼主做硬件IIC时要严格遵守ST的设计思路才行，要不然容易出错。我花了一周的时间才把硬件IIC搞定，下面给你提供已经调试成功的两个函数作为参考：
如果你把这两个函数理解好了，后面页写函数和随机写函数都能搞定了。
void I2C_Write_OneByte(unsigned char Write_Addr,unsigned char Data)
{

   /*!< While the bus is busy */
      while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
   {

   }
   /* Start the config sequence */
   I2C_GenerateSTART(I2C1, ENABLE);
   while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) /* Test on EV5 and clear it */
   {
   }
   I2C_Send7bitAddress(I2C1, EE_ADDRESS, I2C_Direction_Transmitter); /* Transmit the slave address and enable writing operation */
   while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) /* Test on EV6 and clear it */
   {
   }
   I2C_SendData(I2C1, Write_Addr);/* Transmit the first address for write operation */
   while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTING))/* Test on EV8 and clear it */
   {
   }

   I2C_SendData(I2C1, Data); /* Prepare the register value to be sent */

   /*!< Wait till all data have been physically transferred on the bus */
   while(!I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF))
   {
   }
   /* End the configuration sequence */
   I2C_GenerateSTOP(I2C1, ENABLE);

}
unsigned charI2C_Read_OneByte(unsigned char Read_Addr)
{
   unsigned chartemp = 0;
   unsigned int Timeout=0;
   Timeout = I2C_Timeout ;
      //I2C_AcknowledgeConfig(I2C1, ENABLE);
   /*!< While the bus is busy */
      while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
   {
      if((Timeout--) == 0) return 1;

   }
   /* Start the config sequence */
   I2C_GenerateSTART(I2C1, ENABLE);
   Timeout = I2C_Timeout ;

   while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))/* Test on EV5 and clear it */
   {
      if((Timeout--) == 0) return 1;
   }
   /* Transmit the slave address and enable writing operation */
   I2C_Send7bitAddress(I2C1, EE_ADDRESS, I2C_Direction_Transmitter);

   Timeout = I2C_Timeout ;
   while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) /* Test on EV6 and clear it */
   {
      if((Timeout--) == 0) return 1;

   }
   /* Transmit the register address to be read */
   I2C_SendData(I2C1, Read_Addr);

   Timeout = I2C_Timeout ;
   while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF) == RESET) /* Test on EV8 and clear it */
   {
      if((Timeout--) == 0) return 1;
   }

   /*!< Send START condition a second time */
   I2C_GenerateSTART(I2C1, ENABLE);


      Timeout = I2C_Timeout ;
      while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) /*!< Test on EV5 and clear it (cleared by reading SR1 then writing to DR) */
   {
      if((Timeout--) == 0) return 1;
   }

      /*!< Send device address for read */
      I2C_Send7bitAddress(I2C1, EE_ADDRESS, I2C_Direction_Receiver);

      /* Wait on ADDR flag to be set (ADDR is still not cleared at this level */
         Timeout = I2C_Timeout ;
         while(I2C_GetFlagStatus(I2C1, I2C_FLAG_ADDR) == RESET)//EV6
         {
         if((Timeout--) == 0) return 1;
         }
         /*!< Disable Acknowledgment */
      I2C_AcknowledgeConfig(I2C1, DISABLE);
      /* Clear ADDR register by reading SR1 then SR2 register (SR1 has already been read) */
      (void)I2C1->SR2;

      /*!< Send STOP Condition */
      I2C_GenerateSTOP(I2C1, ENABLE);
      /* Wait for the byte to be received */
      Timeout = I2C_Timeout ;
      while(I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) == RESET)
      {
      if((Timeout--) == 0) return 1;
      }
      /*!< Read the byte received from the device */
      temp = I2C_ReceiveData(I2C1);
      /* Wait to make sure that STOP flag has been cleared */
      Timeout = I2C_Timeout ;
      while(I2C1->CR1 & I2C_CR1_STOP)
      {
         if((Timeout--) == 0) return 1;
      }

      /*!< Re-Enable Acknowledgment to be ready for another reception */
      I2C_AcknowledgeConfig(I2C1, ENABLE);
      /* Clear AF flag for next communication */
      I2C_ClearFlag(I2C1, I2C_FLAG_AF);
      /* Return the byte read from device */
      return temp;
}

有缘于你 发表于 2014-1-12 15:07:50

RE:STM32F4 I2C 查询方式自发自收问题

用示波器或逻辑分析仪看看波形

dzc2001 发表于 2014-1-12 19:12:26

回复:STM32F4 I2C 查询方式自发自收问题

是不是硬件不通？

勒布朗 发表于 2014-1-13 10:48:42

RE:STM32F4 I2C 查询方式自发自收问题

示波器观察数据是否发出，数据石头接收到

lovelifett 发表于 2014-1-13 17:02:08

回复:STM32F4 I2C 查询方式自发自收问题

回复第 2 楼于2014-01-12 12:36:11发表:
ST的IIC为了规避专利，采用了独特的设计，楼主做硬件IIC时要严格遵守ST的设计思路才行，要不然容易出错。我花了一周的时间才把硬件IIC搞定，下面给你提供已经调试成功的两个函数作为参考：
如果你把这两个函数理解好了，后面页写函数和随机写函数都能搞定了。
void I2C_Write_OneByte(unsigned char Write_Addr,unsigned char Data)
{

/*!< While the bus is busy */
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
{

}
/* Start the config sequence */
I2C_GenerateSTART(I2C1, ENABLE);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) /* Test on EV5 and clear it */
{
}
I2C_Send7bitAddress(I2C1, EE_ADDRESS, I2C_Direction_Transmitter); /* Transmit the slave address and enable writing operation */
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) /* Test on EV6 and clear it */
{
}
I2C_SendData(I2C1, Write_Addr);/* Transmit the first address for write operation */
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTING))/* Test on EV8 and clear it */
{
}

I2C_SendData(I2C1, Data); /* Prepare the register value to be sent */

/*!< Wait till all data have been physically transferred on the bus */
while(!I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF))
{
}
/* End the configuration sequence */
I2C_GenerateSTOP(I2C1, ENABLE);

}
unsigned charI2C_Read_OneByte(unsigned char Read_Addr)
{
unsigned chartemp = 0;
unsigned int Timeout=0;
Timeout = I2C_Timeout ;
//I2C_AcknowledgeConfig(I2C1, ENABLE);
/*!< While the bus is busy */
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
{
if((Timeout--) == 0) return 1;

}
/* Start the config sequence */
I2C_GenerateSTART(I2C1, ENABLE);
Timeout = I2C_Timeout ;

while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))/* Test on EV5 and clear it */
{
if((Timeout--) == 0) return 1;
}
/* Transmit the slave address and enable writing operation */
I2C_Send7bitAddress(I2C1, EE_ADDRESS, I2C_Direction_Transmitter);

Timeout = I2C_Timeout ;
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) /* Test on EV6 and clear it */
{
if((Timeout--) == 0) return 1;

}
/* Transmit the register address to be read */
I2C_SendData(I2C1, Read_Addr);

Timeout = I2C_Timeout ;
while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF) == RESET) /* Test on EV8 and clear it */
{
if((Timeout--) == 0) return 1;
}

/*!< Send START condition a second time */
I2C_GenerateSTART(I2C1, ENABLE);

Timeout = I2C_Timeout ;
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) /*!< Test on EV5 and clear it (cleared by reading SR1 then writing to DR) */
{
if((Timeout--) == 0) return 1;
}

/*!< Send device address for read */
I2C_Send7bitAddress(I2C1, EE_ADDRESS, I2C_Direction_Receiver);

/* Wait on ADDR flag to be set (ADDR is still not cleared at this level */
Timeout = I2C_Timeout ;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_ADDR) == RESET)//EV6
{
if((Timeout--) == 0) return 1;
}
/*!< Disable Acknowledgment */
I2C_AcknowledgeConfig(I2C1, DISABLE);
/* Clear ADDR register by reading SR1 then SR2 register (SR1 has already been read) */
(void)I2C1->SR2;

/*!< Send STOP Condition */
I2C_GenerateSTOP(I2C1, ENABLE);
/* Wait for the byte to be received */
Timeout = I2C_Timeout ;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) == RESET)
{
if((Timeout--) == 0) return 1;
}
/*!< Read the byte received from the device */
temp = I2C_ReceiveData(I2C1);
/* Wait to make sure that STOP flag has been cleared */
Timeout = I2C_Timeout ;
while(I2C1->CR1 & I2C_CR1_STOP)
{
if((Timeout--) == 0) return 1;
}

/*!< Re-Enable Acknowledgment to be ready for another reception */
I2C_AcknowledgeConfig(I2C1, ENABLE);
/* Clear AF flag for next communication */
I2C_ClearFlag(I2C1, I2C_FLAG_AF);
/* Return the byte read from device */
return temp;
}
请问下，就是在发送从地址时，到底address左不左移一位，我左移后从设备就没有应答了？如果不左移，从设备应答，但又卡在while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));这句，数据寄存器的数据一直发不出。。。

lovelifett 发表于 2014-1-13 17:04:08

回复:STM32F4 I2C 查询方式自发自收问题

回复第 3 楼于2014-01-12 15:07:50发表:
用示波器或逻辑分析仪看看波形
看了，就是在时钟第九位时没有应答，我把address不左移，后用库函数就有应答，但是卡在while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));这句上，数据发不出去

lovelifett 发表于 2014-1-13 17:06:07

回复:STM32F4 I2C 查询方式自发自收问题

回复第 4 楼于2014-01-12 19:12:26发表:
是不是硬件不通？
感觉有点儿像，不过我用的是开发板，是微雪电子的M4，portZ系列

潇湘一隅 发表于 2014-5-11 21:52:23

RE:STM32F4 I2C 查询方式自发自收问题

我们不使用STM32的硬件IIC来读写24C02，而是通过软件模拟。STM32的硬件IIC非常复杂，更重要的是不稳定，故不推荐使用

_ilikerome_ 发表于 2015-2-20 16:09:48

学习了。。。哈

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