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发表于 2009-7-24 18:37:02
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用STM32硬件IIC的示例代码,没有出过问题
/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : i2c_ee.c
* Author : MCD Application Team
* Version : V2.0.1
* Date : 06/13/2008
* Description : This file provides a set of functions needed to manage the
* communication between I2C peripheral and I2C M24C08 EEPROM.
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "i2c_ee.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define I2C_Speed 100000//400000
#define I2C1_SLAVE_ADDRESS7 0xA0
#define I2C_PageSize 16
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
u16 EEPROM_ADDRESS;
/* Private function prototypes -----------------------------------------------*/
void I2C_Configuration(void);
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : I2C_Configuration
* Description : I2C Configuration
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void I2C_Configuration(void)
{
I2C_InitTypeDef I2C_InitStructure;
/* I2C configuration */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = I2C_Speed;
/* I2C Peripheral Enable */
I2C_Cmd(I2C1, ENABLE);
/* Apply I2C configuration after enabling it */
I2C_Init(I2C1, &I2C_InitStructure);
}
/*******************************************************************************
* Function Name : I2C_EE_Init
* Description : Initializes peripherals used by the I2C EEPROM driver.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void I2C_EE_Init()
{
/* GPIO configuration */
//GPIO_Configuration();
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure I2C1 pins: SCL and SDA */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* I2C configuration */
I2C_Configuration();
/* depending on the EEPROM Address selected in the i2c_ee.h file */
#ifdef EEPROM_Block0_ADDRESS
/* Select the EEPROM Block0 to write on */
EEPROM_ADDRESS = EEPROM_Block0_ADDRESS;
#endif
#ifdef EEPROM_Block1_ADDRESS
/* Select the EEPROM Block1 to write on */
EEPROM_ADDRESS = EEPROM_Block1_ADDRESS;
#endif
#ifdef EEPROM_Block2_ADDRESS
/* Select the EEPROM Block2 to write on */
EEPROM_ADDRESS = EEPROM_Block2_ADDRESS;
#endif
#ifdef EEPROM_Block3_ADDRESS
/* Select the EEPROM Block3 to write on */
EEPROM_ADDRESS = EEPROM_Block3_ADDRESS;
#endif
}
/*******************************************************************************
* Function Name : I2C_EE_BufferWrite
* Description : Writes buffer of data to the I2C EEPROM.
* Input : - pBuffer : pointer to the buffer containing the data to be
* written to the EEPROM.
* - WriteAddr : EEPROM's internal address to write to.
* - NumByteToWrite : number of bytes to write to the EEPROM.
* Output : None
* Return : None
*******************************************************************************/
void I2C_EE_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite)
{
u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0;
Addr = WriteAddr % I2C_PageSize;
count = I2C_PageSize - Addr;
NumOfPage = NumByteToWrite / I2C_PageSize;
NumOfSingle = NumByteToWrite % I2C_PageSize;
/* If WriteAddr is I2C_PageSize aligned */
if(Addr == 0)
{
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage == 0)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
I2C_EE_WaitEepromStandbyState();
}
/* If NumByteToWrite > I2C_PageSize */
else
{
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);
I2C_EE_WaitEepromStandbyState();
}
}
}
/* If WriteAddr is not I2C_PageSize aligned */
else
{
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage== 0)
{
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);
I2C_EE_WaitEepromStandbyState();
WriteAddr += count;
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);
I2C_EE_WaitEepromStandbyState();
}
}
}
}
/*******************************************************************************
* Function Name : I2C_EE_ByteWrite
* Description : Writes one byte to the I2C EEPROM.
* Input : - pBuffer : pointer to the buffer containing the data to be
* written to the EEPROM.
* - WriteAddr : EEPROM's internal address to write to.
* Output : None
* Return : None
*******************************************************************************/
void I2C_EE_ByteWrite(u8* pBuffer, u8 WriteAddr)
{
/* Send STRAT condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it */
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 */
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 */
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);
}
/*******************************************************************************
* Function Name : I2C_EE_PageWrite
* Description : Writes more than one byte to the EEPROM with a single WRITE
* cycle. The number of byte can't exceed the EEPROM page size.
* Input : - pBuffer : pointer to the buffer containing the data to be
* written to the EEPROM.
* - WriteAddr : EEPROM's internal address to write to.
* - NumByteToWrite : number of bytes to write to the EEPROM.
* Output : None
* Return : None
*******************************************************************************/
void I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)
{
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it */
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 */
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 */
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);
}
/*******************************************************************************
* Function Name : I2C_EE_BufferRead
* Description : Reads a block of data from the EEPROM.
* Input : - pBuffer : pointer to the buffer that receives the data read
* from the EEPROM.
* - ReadAddr : EEPROM's internal address to read from.
* - NumByteToRead : number of bytes to read from the EEPROM.
* Output : None
* Return : None
*******************************************************************************/
void I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it */
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 */
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 */
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);
}
/*******************************************************************************
* Function Name : I2C_EE_WaitEepromStandbyState
* Description : Wait for EEPROM Standby state//置EEPROM为待命状态
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void I2C_EE_WaitEepromStandbyState(void)
{
vu16 SR1_Tmp = 0;
do
{
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Read I2C1 SR1 register */
SR1_Tmp = I2C_ReadRegister(I2C1, I2C_Register_SR1);
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
}while(!(I2C_ReadRegister(I2C1, I2C_Register_SR1) & 0x0002));
/* Clear AF flag */
I2C_ClearFlag(I2C1, I2C_FLAG_AF);
}
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/ |
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