FM24C04驱动程序.doc

评：驱动程序对于所有的铁电系列I2C FRAM都是适用的，只是容量、电平（3V和5V）的不同，驱动程序是针对51MCU的，但对其他MCU只要稍微修改就可使用。 ?????? 在存贮数据量不大，而且读写次数频繁时，可选择I2C FRAM。 //THIS CODE WAS DESIGNED TO DEMONSTRATE HOW THE FM24C04/FM24C04A SERIAL FRAM COULD //BE INTERFACED TO THE 8051 MICROCONTROLLER. THE INTERFACE USES 2 LINES //FROM PORT 2 (P2.7 AND P2.6) TO COMMUNICATE. //THE CODE SHOWN DEMONSTRATES A RANDOM READ AND BYTE WRITE. THE OTHER *//MODES OF OPERATION CAN BE CREATED BY EXPANDING UPON THESE ROUTINES.//深圳市华胄科技有限公司//the first date writed:2003-11-20//email:gaoqiang@//by:tiger//=============================＃i ncludereg52.h＃i ncludeintrins.h#define uchar unsigned char#define uint unsigned int#define IIC_READ 0XA1??? //定义读指令#define IIC_WRITE 0XA0?? //定义写指令#define NOP _nop_()//#define SDA INT0//#define SCL T0//==============================uchar idata buff[32];?//save the byte read out? form iic device in test operationuchar idata readbuff[32];//测试数组，暂存写入读出数据//uchar writebuff[32];//===============================sbit SDA=P1^4;//P2^7;?//THE SDA BIT IS PORT 2 BIT 7sbit SCL=P1^7;//P2^6;?//THE SCL BIT IS PORT 2 BIT 6//sbit WP=P2^5;//sbit test=P1^0;//===============================//define a bit_operation byte to use in shift operation//use this mode can achieve high operation speed uchar bdata bbyte;//定义位操作用数组，采用此方法可提高位操作速度sbit a0=bbyte^0;sbit a1=bbyte^1;sbit a2=bbyte^2;sbit a3=bbyte^3;sbit a4=bbyte^4;sbit a5=bbyte^5;sbit a6=bbyte^6;sbit a7=bbyte^7;//========================================bit IFACK;?//record the SDA state to confirn if ACK has happened bit NO_ACK;?//no ack flagbit BUS_FAULT;?//bus fault flag//========================================//FUNCTION:ROUTES TO PROVIDE A START SIGNALvoid start(void){?SCL=0;SDA=1;SCL=1;SDA=0;SCL=0;}//=======================================//FUNCTION:ROUTES TO PROVIDE A STOP SIGNALvoid stop(void){?SCL=0;SDA=0;SCL=1;SDA=1;SCL=0;}//=====================================//FUNCTION:ROUTES TO PROVIDE ACK SINGALvoid ack(void){?S