mcu.zip_iic控制

#include <iom128v.h> #include <macros.h> #include "usart.h" #include "common.h" #include "delay.h" #define nopp1 1*5 #define nopp2 2*5 #define nopp3 3*5 #define nopp4 4*5 #define nopp5 5*5 #define SCL_H() PORTB|=(1<<PB6) #define SCL_L() PORTB&=~(1<<PB6) #define SDA_H() PORTB|=(1<<PB5) #define SDA_L() PORTB&=~(1<<PB5) unsigned char ack=0; void Start_I2c(void)//SCL为高电平，SDA由高变低，表示起始条件 { unsigned int i; SDA_H(); for(i=0;i<nopp3;i++); SCL_H(); for(i=0;i<nopp5;i++); SDA_L(); for(i=0;i<nopp5;i++); SCL_L(); for(i=0;i<nopp3;i++); } void Stop_I2c(void)//SCL为高，SDA由低变高，表示停止条件 { unsigned int i; SDA_L(); for(i=0;i<nopp3;i++); SCL_H(); for(i=0;i<nopp5;i++); SDA_H(); for(i=0;i<nopp5;i++); } unsigned char SdaState(void)//读取 { unsigned char i,j=255; DDRB&=~(1<<PB5); PORTB|=(1<<PB5); for(i=0;i<nopp1;i++); while((PINB&0x20)!=0) { if((j--)==0) { DDRB|=(1<<PB5); return(1); } else for(i=0;i<nopp1;i++); }; for(i=0;i<nopp1;i++); DDRB|=(1<<PB5); return(0); } void Sendbyte(unsigned char c) { unsigned int i; unsigned char BitCnt; DDRB|=(1<<PB5)|(1<<PB6); PORTB&=~(1<<PB1)|(1<<PB6); for(BitCnt=0;BitCnt<8;BitCnt++) { if((c<<BitCnt)&0x80) SDA_H(); else SDA_L(); for(i=0;i<nopp2;i++) SCL_H(); for(i=0;i<nopp5;i++) SCL_L(); } for(i=0;i<nopp2;i++) SDA_H(); for(i=0;i<nopp3;i++) SCL_H(); for(i=0;i<nopp2;i++); if(SdaState()) ack=0; else ack=1; for(i=0;i<nopp2;i++); if(SdaState()) ack=0; else ack=1; for(i=0;i<nopp1;i++); SCL_L(); for(i=0;i<nopp2;i++); } void Sendword(unsigned int c) { unsigned int i; unsigned char BitCnt; DDRB|=(1<<PB5)|(1<<PB6); PORTB&=~(1<<PB1)|(1<<PB6); for(BitCnt=0;BitCnt<16;BitCnt++) { if((c<<BitCnt)&0x8000) SDA_H(); else SDA_L(); for(i=0;i<nopp2;i++) SCL_H(); for(i=0;i<nopp5;i++) SCL_L(); } for(i=0;i<nopp2;i++) SDA_H(); for(i=0;i<nopp3;i++) SCL_H(); for(i=0;i<nopp2;i++); if(SdaState()) ack=0; else ack=1; for(i=0;i<nopp2;i++); if(SdaState()) ack=0; else ack=1; for(i=0;i<nopp1;i++); SCL_L(); for(i=0;i<nopp2;i++); } unsigned char Rcvbyte(void) { unsigned int i; unsigned char retc=0; unsigned char BitCnt; SDA_H(); DDRB&=~(1<<PB5); for(BitCnt=0;BitCnt<8;BitCnt++) { for(i=0;i<nopp2;i++); SCL_L(); for(i=0;i<nopp5;i++); retc=retc<<1; for(i=0;i<nopp1;i++); if((PINB&0x20)!=0)retc=retc+1; SCL_H(); for(i=0;i<nopp5;i++); } SCL_L(); DDRB|=(1<<PB5); for(i=0;i<nopp2;i++); return(retc); } unsigned int Rcvword(void) { unsigned int i; unsigned int retc=0; unsigned char BitCnt; SDA_H(); DDRB&=~(1<<PB5); for(BitCnt=0;BitCnt<16;BitCnt++) { for(i=0;i<nopp2;i++); SCL_L(); for(i=0;i<nopp5;i++); retc=retc<<1; for(i=0;i<nopp1;i++); if((PINB&0x20)!=0)retc=retc+1; SCL_H(); for(i=0;i<nopp5;i++); } SCL_L(); DDRB|=(1<<PB5); for(i=0;i<nopp2;i++); return(retc); } void Ack_I2c(unsigned char a) { unsigned int i; if(a==0)SDA_L(); else SDA_H(); for(i=0;i<nopp3;i++); SCL_H(); for(i=0;i<nopp5;i++); SCL_L(); for(i=0;i<nopp2;i++); } unsigned char ISendStr_byte(unsigned char sla,unsigned int suba,unsigned char info)//write { unsigned char i; Start_I2c(); Sendbyte(sla); if(ack==0) return(0); Sendbyte(suba); if(ack=0) return(0); Sendbyte(info); if(ack=0) return(0); Stop_I2c(); return(1); } unsigned char ISendStr_word(unsigned char sla,unsigned int suba,unsigned int info)//write { unsigned char i; Start_I2c(); Sendbyte(sla); if(ack==0) return(0); Sendbyte(suba); if(ack=0) return(0); Sendword(info); if(ack=0) return(0); Stop_I2c(); return(1); } unsigned char IRcvStr_byte(unsigned char sla,unsigned int suba)//read { unsigned char data; Start_I2c(); Sendbyte(sla); if(ack==0)return(0); Sendbyte(suba); if(ack==0)return(0); Start_I2c(); Sendbyte(sla+1); if(ack==0)return(0); data=Rcvbyte(); Ack_I2c(1); Stop_I2c(); return data; } unsigned int IRcvStr_Word(unsigned char sla,unsigned int suba,unsigned int *r)//read { unsigned int i; unsigned int m,n; Start_I2c(); Sendbyte(sla); if(ack==0)return(0); Sendbyte(suba); if(ack==0)return(0); Start_I2c(); Sendbyte(sla+1); if(ack==0)return(0); m=Rcvbyte();//l Ack_I2c(0); n=Rcvbyte();//h *r=n<<8; *r|=m; Ack_I2c(1); Stop_I2c(); return (1); }