STM32硬件IIC读写EEPROM

前面一篇写了软件模拟IIC读写EEPROM。

本篇介绍硬件IIC读写EEPROM。平台是STM32F103+AT24C04N。SDA和SCL接5K上拉电阻到3.3v。

首先介绍AT24C04N的基本特性。512byte。支持1.8v~5.5v供电。支持5种读写模式。BYTE WRITE（字节写），PAGE WRITE（按页写）。RANDOM READ（随机读），SEQUENTIAL READ（顺序读）和CURRENT ADDRESS READ .具体时序参考数据手册。

我用的是I2C1接口。

宏定义如下：

#define EEPROM_Block_ADDRESS 0xA0   /* Device Address */#define I2C1_SLAVE_ADDRESS7        0xA0
#define I2C_PageSize              16
#define I2C_BUF_LEN               256#define EEPROM_I2C                          I2C1
#define EEPROM_I2C_CLK                      RCC_APB1Periph_I2C1
#define EEPROM_I2C_SCL_PIN                  GPIO_Pin_6                 /* PB.6 */
#define EEPROM_I2C_SCL_GPIO_PORT            GPIOB                       /* GPIOB */
#define EEPROM_I2C_SCL_GPIO_CLK             RCC_APB2Periph_GPIOB
#define EEPROM_I2C_SDA_PIN                  GPIO_Pin_7                  /* PB.7 */
#define EEPROM_I2C_SDA_GPIO_PORT            GPIOB                       /* GPIOB */
#define EEPROM_I2C_SDA_GPIO_CLK             RCC_APB2Periph_GPIOB#define I2C_SPEED 200000extern uint8_t I2C_Buf[I2C_BUF_LEN];

配置和功能函数如下：

/* Includes ------------------------------------------------------------------*/
#include <stdio.h>/* Private macro -------------------------------------------------------------*/
#define TIMEOUT 1000/* Private variables ---------------------------------------------------------*/
uint8_t EEPROM_ADDRESS = EEPROM_Block_ADDRESS;u32 I2C_Timeout =1000;static void delay_ms(u32 t)
{u16 i = 8000;while(t--){i = 8000;while(i--);}
}static void delay_us(u32 d)
{while(d--) ;
}/*** @brief  Configure the used I/O ports pin* @param  None* @retval : None*/
void GPIO_Configuration(void)
{
#if 1GPIO_InitTypeDef  GPIO_InitStructure; RCC_APB2PeriphClockCmd( EEPROM_I2C_SCL_GPIO_CLK | EEPROM_I2C_SDA_GPIO_CLK, ENABLE );/* Configure I2C1 pins: SCL and SDA */GPIO_InitStructure.GPIO_Pin        =   EEPROM_I2C_SCL_PIN | EEPROM_I2C_SDA_PIN;GPIO_InitStructure.GPIO_Speed  =  GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode       =  GPIO_Mode_AF_OD;//GPIO_Init(EEPROM_I2C_SCL_GPIO_PORT | EEPROM_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);GPIO_Init(EEPROM_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
#endif
}/*** @brief  I2C Configuration* @param  None* @retval : None*/
void I2C_Configuration(void)
{
#if 1I2C_InitTypeDef  I2C_InitStructure; RCC_APB1PeriphClockCmd( EEPROM_I2C_CLK, ENABLE );/* 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;/* Apply I2C configuration after enabling it */I2C_Init(EEPROM_I2C, &I2C_InitStructure);/* I2C Peripheral Enable */I2C_Cmd(EEPROM_I2C, ENABLE);#endif
}/*** @brief  Initializes peripherals used by the I2C EEPROM driver.* @param  None* @retval : None*/
void I2C_EE_Init()
{/* GPIO configuration */GPIO_Configuration();/* I2C configuration */I2C_Configuration();/* depending on the EEPROM Address selected in the i2c_ee.h file *//* Select the EEPROM Block0 to write on */EEPROM_ADDRESS = EEPROM_Block_ADDRESS;
}/*** @brief  Writes one byte to the I2C EEPROM.* @param pBuffer : pointer to the buffer  containing the data to be *   written to the EEPROM.* @param WriteAddr : EEPROM's internal address to write to.* @retval : None*/
void I2C_EE_ByteWrite(uint8_t* pBuffer, uint8_t WriteAddr)
{/* While the bus is busy */while(I2C_GetFlagStatus(EEPROM_I2C, I2C_FLAG_BUSY));/* Send STRAT condition */I2C_GenerateSTART(EEPROM_I2C, ENABLE);I2C_Timeout = TIMEOUT;/* Test on EV5 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT))  {if(I2C_Timeout-- == 0) break;}/* Send EEPROM address for write */I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);I2C_Timeout = TIMEOUT;/* Test on EV6 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){if(I2C_Timeout-- == 0) break;}/* Send the EEPROM's internal address to write to */I2C_SendData(EEPROM_I2C, WriteAddr);I2C_Timeout = TIMEOUT;/* Test on EV8 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED)){if(I2C_Timeout-- == 0) break;}/* Send the byte to be written */I2C_SendData(EEPROM_I2C, *pBuffer); I2C_Timeout = TIMEOUT;/* Test on EV8 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED)){if(I2C_Timeout-- == 0) break;}/* Send STOP condition */I2C_GenerateSTOP(EEPROM_I2C, ENABLE);/* 延时不得小于5ms write cycle time*/delay_ms(15);
}/*** @brief  Writes more than one byte to the EEPROM with a single WRITE*   cycle. The number of byte can't exceed the EEPROM page size.* @param pBuffer : pointer to the buffer containing the data to be *   written to the EEPROM.* @param WriteAddr : EEPROM's internal address to write to.* @param NumByteToWrite : number of bytes to write to the EEPROM.* @retval : None*/
void I2C_EE_PageWrite(uint8_t* pBuffer, uint8_t WriteAddr)
{
#if 1uint8_t NumByteToWrite;NumByteToWrite = I2C_PageSize;/* While the bus is busy */while(I2C_GetFlagStatus(EEPROM_I2C, I2C_FLAG_BUSY));/* Send START condition */I2C_GenerateSTART(EEPROM_I2C, ENABLE);/* Test on EV5 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT)); /* Send EEPROM address for write */I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);/* Test on EV6 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));  /* Send the EEPROM's internal address to write to */    I2C_SendData(EEPROM_I2C, WriteAddr);  /* Test on EV8 and clear it */while(! I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED));/* While there is data to be written */while(NumByteToWrite--)  {/* Send the current byte */I2C_SendData(EEPROM_I2C, *pBuffer); /* Point to the next byte to be written */pBuffer++; /* Test on EV8 and clear it */while (!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED));}/* Send STOP condition */I2C_GenerateSTOP(EEPROM_I2C, ENABLE);/* 延时不得小于5ms write cycle time*/delay_ms(20);#endif
}void I2C_EE_RandomrRead(uint8_t* pBuffer, uint8_t ReadAddr)
{  /* While the bus is busy */while(I2C_GetFlagStatus(EEPROM_I2C, I2C_FLAG_BUSY));/* step 1 Send START condition */I2C_GenerateSTART(EEPROM_I2C, ENABLE);I2C_Timeout = TIMEOUT;/* Test on EV5 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT)){if(I2C_Timeout-- == 0) break;}/* step 2 Send EEPROM address for write */I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);I2C_Timeout = TIMEOUT;/* Test on EV6 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){if(I2C_Timeout-- == 0) break;}/* Clear EV6 by setting again the PE bit */I2C_Cmd(EEPROM_I2C, ENABLE);//printf("\r\nstep 3:IIC reg addr   \r\n");/* step 3 Send the EEPROM's internal address to write to */I2C_SendData(EEPROM_I2C, ReadAddr);  I2C_Timeout = TIMEOUT;/* Test on EV8 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED)){if(I2C_Timeout-- == 0) break;}/* step 4 Send STRAT condition a second time */  I2C_GenerateSTART(EEPROM_I2C, ENABLE);I2C_Timeout = TIMEOUT;/* Test on EV5 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT)){if(I2C_Timeout-- == 0) break;}/*step 5  Send EEPROM address for read */I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Receiver);I2C_Timeout = TIMEOUT;/* Test on EV6 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)){if(I2C_Timeout-- == 0) break;}/*step 6  Disable Acknowledgement */I2C_AcknowledgeConfig(EEPROM_I2C, DISABLE);/*step 7 Send STOP Condition ,如果不在此处发stop信号， 而在接收数据后，会多收一个字节*/I2C_GenerateSTOP(EEPROM_I2C, ENABLE);I2C_Timeout = TIMEOUT;while(I2C_GetFlagStatus(EEPROM_I2C,I2C_FLAG_RXNE) == RESET){if(I2C_Timeout-- == 0) break;}*pBuffer = I2C_ReceiveData(EEPROM_I2C);/*step 7 Send STOP Condition *///I2C_GenerateSTOP(EEPROM_I2C, ENABLE);//printf("\r\nIIC rec data  0x%x\r\n",*pBuffer);
}uint8_t I2C_EE_CurrentRead(void)
{  uint8_t recdata = 0x0;
#if 1/* While the bus is busy */while(I2C_GetFlagStatus(EEPROM_I2C, I2C_FLAG_BUSY));/* step 4 Send STRAT condition a second time */  I2C_GenerateSTART(EEPROM_I2C, ENABLE);I2C_Timeout = TIMEOUT;/* Test on EV5 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT)){if(I2C_Timeout-- == 0) break;}/*step 5  Send EEPROM address for read */I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Receiver);I2C_Timeout = TIMEOUT;/* Test on EV6 and clear it */while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)){if(I2C_Timeout-- == 0) break;}/*step 6  Disable Acknowledgement */I2C_AcknowledgeConfig(EEPROM_I2C, DISABLE);/*step 7 Send STOP Condition ,如果不在此处发stop信号， 而在接收数据后，会多收一个字节*/I2C_GenerateSTOP(EEPROM_I2C, ENABLE);I2C_Timeout = TIMEOUT;while(I2C_GetFlagStatus(EEPROM_I2C,I2C_FLAG_RXNE) == RESET){if(I2C_Timeout-- == 0) break;}recdata = I2C_ReceiveData(EEPROM_I2C);/*step 7 Send STOP Condition *///I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
#endif  return recdata;
}

代码参考了普中科技的ARM板子例程。板子例程里有很多bug不太好用。如果有源码大家可以对比研究。我实现了随机读，顺序读，按字节写，按页写等4种标准操作。请注意注释部分，这些代码都经过平台验证，可以直接使用，因为我的板子A0~A2都接到GND上了，所以，我的代码支持前256字节操作。

实际波形如下：

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