24C02 I2C 驱动程序(详细 全).doc

/*-24C02.h-*/#ifndef _24C02_H#define_24C02_H/* Includes -*/#include STC15F2K60S2.h#include stdbool.h/* Define -*/#define WC24C02 0xa0/器件地址 写#define RC24C02 0xa1/器件地址 读#define MAXSIZE24C02 256/AT24C02最多256个字节 2K bits 32页#define I2C_PAGESIZE 8/AT24C02每页有8个字节#define delayNOP() _nop_();_nop_();_nop_();_nop_() /延时sbit SDA = P25;/定义数据线sbit SCL = P26;/定义时钟线/* Private -*/* Public -*/uint idata ucSendBuffer8=0x01,0x02,0x04,0x08, 0x10,0x20,0x40,0x80;uint idata ucReceData;uint idata ucReceiveBuffer8;/从器件中读出的多字节数据暂存区/* Function Declaration -*/bool I2CStart(void);/启动I2Cvoid I2CStop(void);/停止I2Cvoid I2CAck(void);/应答信号void I2CNoAck(void);/发送非应答信号bool I2CWaitAck(void);/检测应答位void I2CSendByte(u8 demand);/发送一字节数据u8 I2CReceiveByte(void);/接收一字节数据/extern bool I2C_ByteWrite(u8* pBuffer, u8 WriteAddr);/向24c02中写入1个字节extern bool I2C_PageWrite(u8* pBuffer, u8 WriteAddr, u8 n);/24c02页写 (不超过一页)extern bool I2C_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 n);/24c02数据块写 (不超过256个字节)extern bool I2C_BufferRead(u8* pBuffer, u8 ReadAddr, u16 n);/从24C02中读出N字节数据(不超过256个字节)#endif/*-end file-*/*-24C02.c-*/* (C) COPYRIGHT 2014 xxxx * * 文件名 ：24c02.c * 描述 ：本函数是xxxxx的24C02的读写函数 注:器件地址0xa0 数据地址:00H-FFH 2K bits 256Byte * 平台 ：Keil 4 A51 * 库版本 ：使用了宏晶科技的相关资料及程序 STM库3.50 I2C程序 * 作者 ：xxxxxx * 时间 ：2014.9.3*/* Includes -*/#include 24c02.h/*开启24c02的I2C总线*/bool I2CStart(void)SDA=1;SCL=1;delayNOP();delayNOP();if(!SDA)return false;/SDA线为低电平则总线忙,退出SDA=0;delayNOP();delayNOP();while(SDA)return false;/SDA线为高电平则总线出错,退出SCL=0;delayNOP();return true;/*关闭24c02的I2C总线*/void I2CStop(void)SDA=0;SCL=0;delayNOP();delayNOP();SCL=1;delayNOP();delayNOP();SDA=1;/*发送 ACK*/void I2CAck(void)SDA=0;SCL=0;delayNOP();/delayNOP();SCL=1;delayNOP();/delayNOP();SCL=0;/*发送NO ACK*/void I2CNoAck(void)SDA=1;SCL=0;delayNOP();/delayNOP();SCL=1;delayNOP();/delayNOP();SCL=0;/*读取ACK信号*/bool I2CWaitAck(void) /返回为:1=有ACK,0=无ACKSCL=0;SDA=1;/设置SDA为输入delayNOP();/delayNOP();SCL=1;delayNOP();/delayNOP();if(SDA)SCL=0;return false;SCL=0;return true;/*MCU向24c02发送一个字节数据 */void I2CSendByte(u8 demand) /数据从高位到低位/u8 i=8; while(i-)SCL=0;_nop_();SDA=(bool)(demand&0x80);demand=1;delayNOP();/delayNOP();SCL=1;delayNOP();/delayNOP();SCL=0;/*MCU从24c02读入一字节数据*/u8 I2CReceiveByte(void) /数据从高位到低位/u8 i=8;u8 ddata=0;SDA=1;/设置SDA为输入while(i-)ddata=1; /数据从高位开始读取SCL=0;delayNOP();/delayNOP();SCL=1;delayNOP();/从高位开始 ddata|=SDA;ddata I2C_PAGESIZE | !n)return false;I2CStart();/启动I2CI2CSendByte(WC24C02);/发送器件地址 写if(I2CWaitAck() = 0) return false;I2CSendByte(WriteAddr);if(I2CWaitAck() = 0) return false;for(i = 0; i MAXSIZE24C02)return 0; Addr = WriteAddr % I2C_PAGESIZE; count = I2C_PAGESIZE - Addr; NumOfPage = n / I2C_PAGESIZE; NumOfSingle = n % I2C_PAGESIZE; /* If WriteAddr is I2C_PAGESIZE aligned */ if(Addr = 0) /* If n I2C_PAGESIZE */ else while(NumOfPage-) if(I2C_PageWrite(pBuffer, WriteAddr, I2C_PAGESIZE) = false)return false; WriteAddr += I2C_PAGESIZE; pBuffer += I2C_PAGESIZE; if(NumOfSingle!=0) if(I2C_PageWrite(pBuffer, WriteAddr, NumOfSingle) = false)return false; /* If WriteAddr is not I2C_PAGESIZE aligned */ else /* If n I2C_PAGESIZE */ else n -= count; NumOfPage = n / I2C_PAGESIZE; NumOfSingle = n % I2C_PAGESIZE; if(count != 0) if(I2C_PageWrite(pBuffer, WriteAddr, count) = false)return false; WriteAddr += count; pBuffer += count; while(NumOfPage-) if(I2C_PageWrite(pBuffer, WriteAddr, I2C_PAGESIZE) = false)return false; WriteAddr += I2C_PAGESIZE; pBuffer += I2C_PAGESIZE; if(NumOfSingle != 0) if(I2C_PageWrite(pBuffer, WriteAddr, NumOfSingle) = false)return false; return true;/*名称：bool I2C_BufferRead*功能：从24C02中读出读取一块数据(不超过256个字节) * 输入 ：-pBuffer 缓冲区指针 * -ReadAddr EEPROM的数据地址 * -n 要从EEPROM读出的字节数 * 返回 ：0:失败 1:成功 * 调用 ：外部调用*/bool I2C_BufferRead(u8* pBuffer, u8 ReadAddr, u16 n)uint i;if(n MAXSIZE24C02)return 0;I2CStart();/启动I2CI2CSendByte(WC24C02);/发送器件地址 写if(I2CWaitAck() = 0) return false;I2CSendByte(ReadAddr);/发送器件内部地址if(I2CWaitAck() = 0) return false;I2CStart();I2CSendByte(RC24C02);/发送器件地址 读if(I2CWaitAck() = 0) return false;fo