关于stm32 I2C的问题用的是stm32的I2C硬件，这是我的配置过程，有些是从网上抄的，但是调不通啊，请大家看看那里有毛病，假如**作的是24c02
I2C_InitStructure.I2C_OwnAddress1 应该配置成什么啊; 这个地址应该是主机的吧，我看有些例子写得是0x00,这是为什么
还有后面写24c02的地址在发送从机的7位地址的时候 EEPROM_ADDRESS应该是是0xA2吗，那为什么我找过的一些例子吗，他们操作的是24c02,但这里却写得是0xa0那
另外在写数据的起始字节地址时，因为AT24C02容量为2048bits，所以地址范围应该是0x00~0xff吧，那我写0xfe,应该是正确的吧
void I2C_Configuration(void)
{
I2C_InitTypeDef I2C_InitStructure;
/* I2C configuration */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; //Tlow/Thigh=2
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;//使能I2C的应答
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;//应答7位地址，这里是从机的地址
I2C_InitStructure.I2C_ClockSpeed = 400000;//I2C速率为400KHz(快速模式）,该值不能高于400KHz
/* Apply I2C configuration after enabling it */
I2C_Init(I2C1, &I2C_InitStructure);
/* I2C Peripheral Enable */
I2C_Cmd(I2C1, ENABLE);
}
void I2C_EE_Init()
{
/* GPIO configuration */
GPIO_Configuration();//GPIO端口配置
/* I2C configuration */
I2C_Configuration();
}
void I2C_EE_SequentialWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite)
{
u8 NumOfPage = 0; //页数
u8 NumOfSingle = 0; //不足一页字节数
u8 Addr = 0; //字节地址
u8 count = 0; //字节计数器
Addr = WriteAddr % I2C_PageSize; //字节地址（不到一页）
count = I2C_PageSize - Addr; //一页中的剩余字节数
NumOfPage = NumByteToWrite / I2C_PageSize; //欲写入数据所占的页数
NumOfSingle = NumByteToWrite % I2C_PageSize; //欲写入数据所占的字节数（不足一页）
/* If WriteAddr is I2C_PageSize aligned */
if(Addr == 0) //起始地址为某页的第一个字节地址处
{
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage == 0)//写入的数据字节数不足一页
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
I2C_EE_WaitEepromStandbyState();//等待EEPROM自编程结束
}
/* If NumByteToWrite > I2C_PageSize */
else//写入的数据超过一页
{
while(NumOfPage--)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);
I2C_EE_WaitEepromStandbyState();
WriteAddr += I2C_PageSize;//下一页起始地址
pBuffer += I2C_PageSize;
}
if(NumOfSingle!=0) //写入余下不足一页的数据
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
I2C_EE_WaitEepromStandbyState();
}
}
}
/* If WriteAddr is not I2C_PageSize aligned 写入数据的起始地址不在页的开始处 */
else
{
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage== 0)//不足一页的，直接写入。注意：当写到页边界时，将从该页的起始地址继续写入数据
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
I2C_EE_WaitEepromStandbyState();
}
/* If NumByteToWrite > I2C_PageSize */
else
{
NumByteToWrite -= count;
NumOfPage = NumByteToWrite / I2C_PageSize;
NumOfSingle = NumByteToWrite % I2C_PageSize;
if(count != 0)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, count); //将WriteAddr所在页的剩余空间写满
I2C_EE_WaitEepromStandbyState();
WriteAddr += count; //地址指向下一页的起始处
pBuffer += count;
}
while(NumOfPage--)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);
I2C_EE_WaitEepromStandbyState();
WriteAddr += I2C_PageSize;
pBuffer += I2C_PageSize;
}
if(NumOfSingle != 0)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); //写入余下不足一页的数据
I2C_EE_WaitEepromStandbyState();
}
}
}
}
void I2C_EE_ByteWrite(u8* pBuffer, u8 WriteAddr)
{
/* While the bus is busy */
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));//等待I2C总线空闲
/* Send STRAT condition */
I2C_GenerateSTART(I2C1, ENABLE); //发送START后，MCU自动从从机模式变成主机模式
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); //等待START产生成功
/* Send EEPROM address for write 发送从机器件地址*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/* Send the EEPROM's internal address to write to发送从机预写入的内部字节地址 */
I2C_SendData(I2C1, WriteAddr);
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* Send the byte to be written */
I2C_SendData(I2C1, *pBuffer);
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* Send STOP condition */
I2C_GenerateSTOP(I2C1, ENABLE);
}
void I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite) //看主发送器的时序图
{
/* While the bus is busy */
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));//等待I2C总线空闲
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);//产生START后，MCU自动从从机模式变成主机模式
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); //等待START产生成功
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/* Send the EEPROM's internal address to write to */
I2C_SendData(I2C1, WriteAddr);
/* Test on EV8 and clear it等待发送数据寄存器空，即收到ACK */
while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* While there is data to be written */
while(NumByteToWrite--)
{
/* Send the current byte */
I2C_SendData(I2C1, *pBuffer);
/* Point to the next byte to be written */
pBuffer++;
/* Test on EV8 and clear it */
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}
/* Send STOP condition */
I2C_GenerateSTOP(I2C1, ENABLE);//发送停止传输指令
}
void I2C_EE_SequentialRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{
/* While the bus is busy */
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it 等待开始信号发送成功*/
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
/* Test on EV6 and clear it等待设备地址发送成功 */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/* Clear EV6 by setting again the PE bit */
I2C_Cmd(I2C1, ENABLE);
/* Send the EEPROM's internal address to write to */
I2C_SendData(I2C1, ReadAddr);
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* Send STRAT condition a second time */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/* Send EEPROM address for read */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Receiver);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
/* While there is data to be read */
while(NumByteToRead)
{
if(NumByteToRead == 1)
{
/* Disable Acknowledgement */
I2C_AcknowledgeConfig(I2C1, DISABLE);
/* Send STOP Condition */
I2C_GenerateSTOP(I2C1, ENABLE);
}
/* Test on EV7 and clear it 接收数据寄存器非空*/
if(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
{
/* Read a byte from the EEPROM */
*pBuffer = I2C_ReceiveData(I2C1);
/* Point to the next location where the byte read will be saved */
pBuffer++;
/* Decrement the read bytes counter */
NumByteToRead--;
}
}
/* Enable Acknowledgement to be ready for another reception */
I2C_AcknowledgeConfig(I2C1, ENABLE);//每接收到一个字节数据向从机发送一个ACK
} |
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