STM32 Hardware I2C EEPROM Command Analysis-EEWORLD

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void I2C_EE_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite)

{

u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0;

//Write the address to see which number of each page

Addr = WriteAddr % I2C_PageSize;

//The number of entries to be written at the beginning of the page

count = I2C_PageSize - Addr;

//Number of pages to write

NumOfPage = NumByteToWrite / I2C_PageSize;

//Less than one page

NumOfSingle = NumByteToWrite % I2C_PageSize;

//EEPROM is set to standby mode

I2C_EE_WaitEepromStandbyState();

//Write address is the beginning of the page

if (Addr == 0)

{

//The data is smaller than one page

if (NumOfPage == 0)

{

//Write less than one page of data

I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);

//EEPROM is set to standby mode

I2C_EE_WaitEepromStandbyState();

}

//Data is greater than or equal to one page

else

{

while (NumOfPage--) //Number of pages to be written

{

//Write a page of data

I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);

//EEPROM is set to standby mode

I2C_EE_WaitEepromStandbyState();

WriteAddr += I2C_PageSize;

pBuffer += I2C_PageSize;

}

//The remaining data is less than one page

if (NumOfSingle!=0)

{

//Write less than one page of data

I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);

//EEPROM is set to standby mode

I2C_EE_WaitEepromStandbyState();

}

//The write address is not the beginning of the page

else

{

//The data is smaller than one page

if (NumOfPage== 0)

{

//Write less than one page of data

I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);

//EEPROM is set to standby mode

I2C_EE_WaitEepromStandbyState();

}

//Data is greater than or equal to one page

else

{

NumByteToWrite -= count;

//Recalculate the number of pages to be written

NumOfPage = NumByteToWrite / I2C_PageSize;

//Recalculate the number of pages that are less than one page

NumOfSingle = NumByteToWrite % I2C_PageSize;

if (count != 0)

{

//Write the starting space to a full page

I2C_EE_PageWrite(pBuffer, WriteAddr, count);

//EEPROM is set to standby mode

I2C_EE_WaitEepromStandbyState();

WriteAddr += count;

pBuffer += count;

}

//Number of pages to write

while (NumOfPage--)

{

//Write a page of data

I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);

//EEPROM is set to standby mode

I2C_EE_WaitEepromStandbyState();

WriteAddr += I2C_PageSize;

pBuffer += I2C_PageSize;

}

//The remaining data is less than one page

if (NumOfSingle != 0)

{

//Write less than one page of data

I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);

//EEPROM is set to standby mode

I2C_EE_WaitEepromStandbyState();

}

void I2C_EE_ByteWrite(u8* pBuffer, u8 WriteAddr)

{

//Generate I2C2 transmission START condition

I2C_GenerateSTART(I2C2, ENABLE);

//Determine whether the host mode is successful by generating START (detecting EV5)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

//Send device address (write)

I2C_Send7bitAddress(I2C2, EEPROM_ADDRESS, I2C_Direction_Transmitter);

// Check if the host transmission mode is successful (check EV6)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

//Send address through peripheral I2C2

I2C_SendData(I2C2, WriteAddr);

//Check whether the bytes sent by the host are successful (check EV8)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

//Send data through peripheral I2C2

I2C_SendData(I2C2, *pBuffer);

// Check if the bytes sent by the host are successful (check EV8)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

//Generate I2C2 transmission STOP condition

I2C_GenerateSTOP(I2C2, ENABLE);

}

void I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)

{

//Generate I2C2 transmission START condition

I2C_GenerateSTART(I2C2, ENABLE);

//Determine whether the host mode is successful by generating START (detecting EV5)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

//Send device address (write)

I2C_Send7bitAddress(I2C2, EEPROM_ADDRESS, I2C_Direction_Transmitter);

// Check if the host transmission mode is successful (check EV6)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

//Send address through peripheral I2C2

I2C_SendData(I2C2, WriteAddr);

// Check if the bytes sent by the host are successful (check EV8)

while (! I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

//Write data

while (NumByteToWrite--)

{

//Send data through peripheral I2C2

I2C_SendData(I2C2, *pBuffer);

// pointer++

pBuffer++;

// Check if the bytes sent by the host are successful (check EV8)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

}

//Generate I2C2 transmission STOP condition

I2C_GenerateSTOP(I2C2, ENABLE);

}

void I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)

{

//EEPROM is set to standby mode

I2C_EE_WaitEepromStandbyState();

//Generate I2C2 transmission START condition

I2C_GenerateSTART(I2C2, ENABLE);

//Determine whether the host mode is successful by generating START (detecting EV5)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

// Disable ACK before reading data in a single data transfer situation

if (NumByteToRead==1)

{

I2C_AcknowledgeConfig(I2C2, DISABLE); //Disable the I2C2 response function

}

//Transmit the address word to the specified slave I2C device and select the sending direction

I2C_Send7bitAddress(I2C2, EEPROM_ADDRESS, I2C_Direction_Transmitter);

// Check if the host transmission mode is successful (check EV6)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

// Enable I2C peripherals

I2C_Cmd(I2C2, ENABLE);

//Send address through peripheral I2C2

I2C_SendData(I2C2, ReadAddr);

// Check if the bytes sent by the host are successful (check EV8)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

//Generate I2C2 transmission START condition

I2C_GenerateSTART(I2C2, ENABLE);

//Determine whether the host mode is successful by generating START (detecting EV5)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

//Send the address word to the specified slave I2C device and select the receiving direction

I2C_Send7bitAddress(I2C2, EEPROM_ADDRESS, I2C_Direction_Receiver);

// Check if the host receiving mode is successful (check EV6)

while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

//Read data

while (NumByteToRead)

{

// Check whether the host received the byte successfully (check EV8)

if (I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED))

{

if (NumByteToRead == 2)

{

// Enable or disable the specified I2C response function

I2C_AcknowledgeConfig(I2C2, DISABLE);

}

if (NumByteToRead == 1)

{

//Generate I2C2 transmission STOP condition

I2C_GenerateSTOP(I2C2, ENABLE);

}

//Return the most recently received data via I2C2

*pBuffer = I2C_ReceiveData(I2C2);

//Point to the next address

pBuffer++;

NumByteToRead--;

}

//Enable I2C2 response function

I2C_AcknowledgeConfig(I2C2, ENABLE);

}

void I2C_EE_WaitEepromStandbyState(void)

{

vu16 SR1_Tmp = 0;

{

//Generate I2C2 transmission START condition

I2C_GenerateSTART(I2C2, ENABLE);

//Read the specified I2C register I2C_SR1 and return its value

SR1_Tmp = I2C_ReadRegister(I2C2, I2C_Register_SR1);

//Transmit the address word to the specified slave I2C device and select the sending direction

I2C_Send7bitAddress(I2C2, EEPROM_ADDRESS, I2C_Direction_Transmitter);

} while (!(I2C_ReadRegister(I2C2, I2C_Register_SR1) & 0x0002));//Address sending completed

// Clear the I2Cx response error flag

I2C_ClearFlag(I2C2, I2C_FLAG_AF);

}

Keywords：STM32 Reference address：STM32 Hardware I2C EEPROM Command Analysis

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