万利的I2C–EEPROM例程有些问题,经自己两个昼夜的重复实验,已修正完善。
修正了两个当地,在void I2C_EE_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite)写操作函数和void I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)读操作函数体内的最初先要履行一句I2C_EE_WaitEepromStandbyState();
这样在今后调用写操作函数和读操作函数时就不必履行I2C_EE_WaitEepromStandbyState()了。但上电复位后先要履行一次读操作,今后就可以无限制的随意调用这两个函数了。
具体如下。
/* Includes ——————————————————————*/ #include “stm32f10x_lib.h” #include “i2c_ee.h” #include”delay.h”
/* Private typedef ———————————————————–*/ /* Private define ————————————————————*/ #define I2C_Speed 10000 #define I2C1_SLAVE_ADDRESS7 0xA0
#define I2C_PageSize 4
/* Private macro ————————————————————-*/ /* Private variables ———————————————————*/ u16 EEPROM_ADDRESS;
/* Private function prototypes ———————————————–*/
void I2C_Configuration(void);
/******************************************************************************* * Function Name : I2C_Configuration * Description : I2C Configuration * Input : None * Output : None * Return : None *******************************************************************************/ void I2C_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; I2C_InitTypeDef I2C_InitStructure;
/* Configure I2C1 pins: SCL and SDA */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;//开漏输出 GPIO_Init(GPIOB, &GPIO_InitStructure); /* I2C configuration */ I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;//设置 I2C为 I2C形式 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;//I2C快速形式 Tlow / Thigh = 2
I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7;//设置第一个设备地址 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;//使能应对 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;//应对 7位地址 I2C_InitStructure.I2C_ClockSpeed = I2C_Speed;//设置时钟频率 /* I2C Peripheral Enable */ I2C_Cmd(I2C1, ENABLE);//使能I2C外设 /* 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() { /* 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 : EEPROMs internal address to write to. * – NumByteToWrite : number of bytes to write to the EEPROM. * Output : None * Return : None pBuffer:指向要写入数据数组的指针 WriteAddr:24c02中要写入数据的首地址 NumByteToWrite:写入的字节数 *******************************************************************************/ void I2C_EE_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite)//将缓冲器的数据写入EEPROM { u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0;
Addr = WriteAddr % I2C_PageSize;//写入地址是每页的第几位 count = I2C_PageSize – Addr;//在开端的一页要写入的个数 NumOfPage = NumByteToWrite / I2C_PageSize;//要写入的页数 NumOfSingle = NumByteToWrite % I2C_PageSize;//缺乏一页的个数 I2C_EE_WaitEepromStandbyState();//EEPROM设为待命状况 /* If WriteAddr is I2C_PageSize aligned */ if(Addr == 0) //写入地址是页的开端 { /* If NumByteToWrite < I2C_PageSize */ if(NumOfPage == 0) //数据小于一页 { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);//写少于一页的数据 I2C_EE_WaitEepromStandbyState();//EEPROM设为待命状况 } /* If NumByteToWrite > I2C_PageSize */ else //数据大于等于一页 { while(NumOfPage–)//要写入的页数 { I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize); //写一页的数据 I2C_EE_WaitEepromStandbyState();//EEPROM设为待命状况 WriteAddr += I2C_PageSize; pBuffer += I2C_PageSize; }
if(NumOfSingle!=0)//剩下数据小于一页 { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);//写少于一页的数据 I2C_EE_WaitEepromStandbyState();//EEPROM设为待命状况 } } } /* If WriteAddr is not I2C_PageSize aligned */ else //写入地址不是页的开端 { /* If NumByteToWrite < I2C_PageSize */ if(NumOfPage== 0) //数据小于一页 { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);//写少于一页的数据 I2C_EE_WaitEepromStandbyState();//EEPROM设为待命状况 } /* If NumByteToWrite > I2C_PageSize */ else//数据大于等于一页 { NumByteToWrite -= count; NumOfPage = NumByteToWrite / I2C_PageSize; //从头核算要写入的页数 NumOfSingle = NumByteToWrite % I2C_PageSize;//从头核算缺乏一页的个数
if(count != 0)//在此处count必定不为0,此判别条件好象有点剩下 { I2C_EE_PageWrite(pBuffer, WriteAddr, count);//将开端的空间写满一页 I2C_EE_WaitEepromStandbyState();//EEPROM设为待命状况 WriteAddr += count; pBuffer += count; }
while(NumOfPage–)//要写入的页数 { I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);//写一页的数据 I2C_EE_WaitEepromStandbyState();//EEPROM设为待命状况 WriteAddr += I2C_PageSize; pBuffer += I2C_PageSize; } if(NumOfSingle != 0)//剩下数据小于一页 { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); //写少于一页的数据 I2C_EE_WaitEepromStandbyState();//EEPROM设为待命状况 } } } }
/******************************************************************************* * 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 : EEPROMs internal address to write to. * Output : None * Return : None pBuffer:指向要写入数据数组的指针 WriteAddr:24c02中要写入数据的首地址 *******************************************************************************/ void I2C_EE_ByteWrite(u8* pBuffer, u8 WriteAddr)//写一个字节到EEPROM { /* Send STRAT condition */ I2C_GenerateSTART(I2C1, ENABLE);//发生 I2Cx传输 START条件
/* Test on EV5 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); //查看最近一次 I2C事情是否是输入的事情
/* Send EEPROM address for write */ I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);//向指定的从 I2C设备传送地址字,挑选发送方向 /* Test on EV6 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));//查看最近一次 I2C事情是否是输入的事情
/* Send the EEPROMs internal address to write to */ I2C_SendData(I2C1, WriteAddr);//经过外设 I2Cx发送地址 /* Test on EV8 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));//查看最近一次 I2C事情是否是输入的事情
/* Send the byte to be written */ I2C_SendData(I2C1, *pBuffer); //经过外设 I2Cx发送数据
/* Test on EV8 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));//查看最近一次 I2C事情是否是输入的事情 /* Send STOP condition */ I2C_GenerateSTOP(I2C1, ENABLE);//发生 I2Cx传输 STOP条件 }
/******************************************************************************* * Function Name : I2C_EE_PageWrite * Description : Writes more than one byte to the EEPROM with a single WRITE * cycle. The number of byte cant exceed the EEPROM page size. * Input : – pBuffer : pointer to the buffer containing the data to be * written to the EEPROM. * – WriteAddr : EEPROMs internal address to write to. * – NumByteToWrite : number of bytes to write to the EEPROM. * Output : None * Return : None pBuffer:指向要写入数据数组的指针 WriteAddr:24c02中要写入数据的首地址 NumByteToWrite:写入的字节数 *******************************************************************************/ void I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)//写少于一页的数据 { /* Send START condition */ I2C_GenerateSTART(I2C1, ENABLE);//发生 I2Cx传输 START条件 /* Test on EV5 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); //查看最近一次 I2C事情是否是输入的事情 /* Send EEPROM address for write */ I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);//向指定的从 I2C设备传送地址字,挑选发送方向
/* Test on EV6 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); //查看最近一次 I2C事情是否是输入的事情
/* Send the EEPROMs internal address to write to */ I2C_SendData(I2C1, WriteAddr); //经过外设 I2Cx发送地址
/* Test on EV8 and clear it */ while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); //查看最近一次 I2C事情是否是输入的事情
/* While there is data to be written */ while(NumByteToWrite–) { /* Send the current byte */ I2C_SendData(I2C1, *pBuffer); //经过外设 I2Cx发送数据
/* Point to the next byte to be written */ pBuffer++; /* Test on EV8 and clear it */ while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));//查看最近一次 I2C事情是否是输入的事情 }
/* Send STOP condition */ I2C_GenerateSTOP(I2C1, ENABLE);//发生 I2Cx传输 STOP条件 }
/******************************************************************************* * 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 : EEPROMs internal address to read from. * – NumByteToRead : number of bytes to read from the EEPROM. * Output : None * Return : None pBuffer:指向要保存读出数据的数组的指针 ReadAddr:24c02中要读出数据的首地址 NumByteToRead:读出的字节数 *******************************************************************************/ void I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)//将EEPROM的数据读入缓冲器 { I2C_EE_WaitEepromStandbyState();//EEPROM设为待命状况 /* Send START condition */ I2C_GenerateSTART(I2C1, ENABLE);//发生 I2Cx传输 START条件 /* Test on EV5 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));//查看最近一次 I2C事情是否是输入的事情 /* In the case of a single data transfer disable ACK before reading the data */ if(NumByteToRead==1) { I2C_AcknowledgeConfig(I2C1, DISABLE);//使能或许失能指定 I2C的应对功用 } /* Send EEPROM address for write */ I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);//向指定的从 I2C设备传送地址字,挑选发送方向
/* Test on EV6 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));//查看最近一次 I2C事情是否是输入的事情 /* Clear EV6 by setting again the PE bit */ I2C_Cmd(I2C1, ENABLE);//使能或许失能 I2C外设
/* Send the EEPROMs internal address to write to */ I2C_SendData(I2C1, ReadAddr); //经过外设 I2Cx发送地址
/* Test on EV8 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));//查看最近一次 I2C事情是否是输入的事情 /* Send STRAT condition a second time */ I2C_GenerateSTART(I2C1, ENABLE);//发生 I2Cx传输 START条件 /* Test on EV5 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));//查看最近一次 I2C事情是否是输入的事情 /* Send EEPROM address for read */ I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Receiver);//向指定的从 I2C设备传送地址字,挑选接纳方向 /* Test on EV6 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));//查看最近一次 I2C事情是否是输入的事情 /* While there is data to be read */ while(NumByteToRead) { /* Test on EV7 and clear it */ if(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)) //查看最近一次 I2C事情是否是输入的事情 { if(NumByteToRead == 2) { /* Disable Acknowledgement */ I2C_AcknowledgeConfig(I2C1, DISABLE);//使能或许失能指定 I2C的应对功用 }
if(NumByteToRead == 1) { /* Send STOP Condition */ I2C_GenerateSTOP(I2C1, ENABLE);//发生 I2Cx传输 STOP条件 }
/* Read a byte from the EEPROM */ *pBuffer = I2C_ReceiveData(I2C1);//回来经过 I2Cx最近接纳的数据
/* 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);//使能或许失能指定 I2C的应对功用 }
/******************************************************************************* * Function Name : I2C_EE_WaitEepromStandbyState * Description : Wait for EEPROM Standby state * Input : None * Output : None * Return : None *******************************************************************************/ void I2C_EE_WaitEepromStandbyState(void) //EEPROM设为待命状况 { vu16 SR1_Tmp = 0;
do { /* Send START condition */ I2C_GenerateSTART(I2C1, ENABLE);//发生 I2Cx传输 START条件 /* Read I2C1 SR1 register */ SR1_Tmp = I2C_ReadRegister(I2C1, I2C_Register_SR1);//读取指定的 I2C寄存器 I2C_SR1 并回来其值 /* Send EEPROM address for write */ I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);//向指定的从 I2C设备传送地址字 ,挑选发送方向 }while(!(I2C_ReadRegister(I2C1, I2C_Register_SR1) & 0x0002));//地址发送完毕 /* Clear AF flag */ I2C_ClearFlag(I2C1, I2C_FLAG_AF);//铲除 I2Cx的应对过错标志位
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