PCF8563_test.rar_51单片机案例_PCF8563_PCF8563 51

#include "REG52.H" #include "intrins.h" #include "ABSACC.h" #define HIGH 1 #define LOW 0 sbit SCL= P1^3; sbit SDA= P1^4; static void delay(void) { unsigned char i; for(i=0;i<200;i++) _nop_() ; } static void I2C_Start(void) { SDA=HIGH;SCL=HIGH;delay(); SDA=LOW;delay();SCL=LOW; } static void I2C_Stop(void) { SDA=LOW;SCL=HIGH;delay(); SDA=HIGH;delay();SDA=LOW; SCL=LOW; } static void I2C_Mack(void) { SDA=LOW;SCL=HIGH;delay(); SCL=LOW;SDA=HIGH; } static void I2C_Mnack(void) { SDA=HIGH;SCL=HIGH;delay(); SCL=LOW; } static bit I2C_Cack(void) { SDA=HIGH;delay();SCL=HIGH; if(!SDA){ SCL=LOW; return(1); } else return(0); } static void I2C_WrByte(unsigned char value) { unsigned char i=8; while(i--) { SDA=(bit)(value&0x80); //SDA=(value&0x80)>>8; value=value<<1; delay(); SCL=HIGH;delay(); SCL=LOW; } } unsigned char I2C_WrNByte(unsigned char chip_addr,unsigned char addr,unsigned char *p_data, unsigned char num) { register unsigned char i; I2C_Start(); I2C_WrByte(chip_addr); if(I2C_Cack()) { I2C_WrByte(addr); if(!I2C_Cack()) return(0); for(i=0;i<num;i++) { I2C_WrByte(*p_data++); if(!I2C_Cack()) return(0); } delay(); I2C_Stop(); delay();delay();delay();delay();delay(); return(1); } else return(0); } static unsigned char I2C_RdByte(void) { unsigned char Data=0; unsigned char i=8; SDA=HIGH; while(i--) { Data=Data<<1; SCL=HIGH; delay(); if(SDA) Data++; SCL=LOW; delay(); } return(Data); } unsigned char I2C_RdNByte(unsigned char chip_addr,unsigned char addr,unsigned char *p_data,unsigned char num) { register unsigned char i; I2C_Start(); I2C_WrByte(chip_addr); if(!I2C_Cack())return 0; I2C_WrByte(addr); if(!I2C_Cack())return 0; I2C_Start(); I2C_WrByte(chip_addr+1); if(!I2C_Cack())return 0; for(i=0;i<num-1;i++) { *p_data=I2C_RdByte(); I2C_Mack(); p_data++; } *p_data=I2C_RdByte(); I2C_Mnack(); I2C_Stop(); return(1); }