IIC-24C04与数码管

#include <reg52.h> #include <intrins.h> #define uchar unsigned char #define uint unsigned int #define NOP4() {_nop_();_nop_();_nop_();_nop_();} sbit SCL = P1^0; sbit SDA = P1^1; uchar code DSY_CODE[]= { 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90 }; uchar DISP_Buffer[]={0,0,0}; uchar Count = 0; void DelayMS(uint x) { uchar t; while(x--) { for(t=120;t>0;t--); } } void Start() { SDA=1;SCL=1;NOP4();SDA=0;NOP4();SCL=0; } void Stop() { SDA=0;SCL=0;NOP4();SCL=1;NOP4();SDA=1; } void RACK() { SDA=1;NOP4();SCL=1;NOP4();SCL=0; } void NO_ACK() { SDA=1;SCL=1;NOP4();SCL=0;SDA=0; } void Write_A_Byte(uchar b) { uchar i; for(i=0;i<8;i++) { b<<=1;SDA=CY;_nop_();SCL=1;NOP4();SCL=0; } RACK(); } uchar Receive_A_Byte() { uchar i,d; for(i=0;i<8;i++) { SCL=1;d<<=1;d|=SDA;SCL=0; } return d; } void Write_Random_Address_Byte(uchar add,uchar dat) { Start(); Write_A_Byte(0xa0); Write_A_Byte(add); Write_A_Byte(dat); Stop(); DelayMS(10); } uchar Read_Current_Address_Data() { uchar d; Start(); Write_A_Byte(0xa1); d=Receive_A_Byte(); NO_ACK(); Stop(); return d; } uchar Random_Read(uchar addr) { Start(); Write_A_Byte(0xa0); Write_A_Byte(addr); Stop(); return Read_Current_Address_Data(); } void Convert_And_Display() { DISP_Buffer[2] = Count/10; DISP_Buffer[1] = Count%100/10; DISP_Buffer[0] = Count%100%10; if(DISP_Buffer[2] == 0) { DISP_Buffer[2] = 10; if(DISP_Buffer[1] == 0) { DISP_Buffer[1] = 10; } } P2 = 0x80; P0 = DSY_CODE[DISP_Buffer[0]]; DelayMS(2); P2 = 0x40; P0 = DSY_CODE[DISP_Buffer[1]]; DelayMS(2); P2 = 0x20; P0 = DSY_CODE[DISP_Buffer[2]]; DelayMS(2); } void main() { Count = Random_Read(0x00) + 1; Write_Random_Address_Byte(0x00,Count); while(1) Convert_And_Display(); }