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24c256的操作，在程序里搞了个连续读写的函数！很烦那页写跨页的问题，所以干脆做了个通用点的函数，小于3字节的写就用随机写，大于3字节的就用页写
真正供其他操作调用的函数是:
unchar SeqWriteTo24c256(unchar sla_add,unint addr_op,unchar write_size,unchar *write_buf);
unchar SeqReadFrom24c256(unchar sla_add,unint addr_op,unchar read_size,unchar *read_buf);
其他的都是本文件内自己调用的函数!!
- //*****************************************************调试函数 void DebugEepromService(void) { unchar debug_buf[255]; debug_buf[0]=0x91; debug_buf[1]=0x92; debug_buf[2]=0x93; debug_buf[3]=0x94; debug_buf[4]=0x95; debug_buf[250]=0x05; debug_buf[251]=0x06; debug_buf[252]=0x07; debug_buf[253]=0x08; debug_buf[254]=0x09; SeqWriteTo24c256(EEP1_ADDR,1,255,debug_buf); SeqReadFrom24c256(EEP1_ADDR,1,255,debug_buf); } //************************************************************* #define IIC_SDA_PB 0x20 #define IIC_SCL_PB 0x80 #define IIC_DEL_WAIT 0x10 //>4.7us(12.80us) for Fre=11.0592M #define IIC_DEL_WRITE 0x2700 //>6ms(7266.54us=7.266ms) for Fre=11.0592M #define EEP1_ADDR 0xa4 #define PAGE_CAP_BYTE 64 //24C256页写容量:64字节 /* 功能函数文件 2005-9-22 9:54 by xth 版本: v1.0 -------------------------------------------- Mcu: [url=http://www.mcuzx.net]AVR[/url] mega32 Frequency: 11.0592M -------------------------------------------- 功能概述:Eeprom操作文件 -------------------------------------------- */ //=============================函数声明 //----------IIC操作调用函数 void IicDelayService(unint delay_time); void IicStartBitSend(void); void IicStopBitSend(void); void IicAckService(unchar ack_data); unchar IicSendByteService(unchar tx_data); unchar IicAccByteService(void); //----------At24c256操作函数 unchar RandWriteByteTo24c256(unchar sla_add,unint addr_op,unchar data_op); unchar WritePageTo24c256(unchar sla_add,unint addr_op,unchar *write_data_buf); unchar SeqWriteTo24c256ByPage(unchar sla_add,unint addr_op,unchar write_size,unchar *write_buf); unchar SeqWriteTo24c256(unchar sla_add,unint addr_op,unchar write_size,unchar *write_buf); unchar SeqReadFrom24c256(unchar sla_add,unint addr_op,unchar read_size,unchar *read_buf); //=============================函数定义 void IicDelayService(unint delay_count) { unint count; for(count=0;count<delay_count;count++) asm("NOP"); } void IicStartBitSend(void) { PORTB |= IIC_SCL_PB; //发送起始条件的时钟信号 asm("NOP"); PORTB |= IIC_SDA_PB; //起始条件建立时间大于4.7us,延时 IicDelayService(IIC_DEL_WAIT); PORTB &= ~IIC_SDA_PB; IicDelayService(IIC_DEL_WAIT); PORTB &= ~IIC_SCL_PB; //钳住I2C总线，准备发送或接收数据 asm("NOP"); } void IicStopBitSend(void) { PORTB &= ~IIC_SDA_PB;//发送结束条件的时钟信号 IicDelayService(IIC_DEL_WAIT); PORTB |= IIC_SCL_PB; //结束条件建立时间大于4μs IicDelayService(IIC_DEL_WAIT); PORTB |= IIC_SDA_PB; asm("NOP"); } void IicAckService(unchar ack_data) {//作为主控器件应答->发应答或非应答信号 if(ack_data==0) PORTB &= ~IIC_SDA_PB; else PORTB |= IIC_SDA_PB; IicDelayService(IIC_DEL_WAIT); PORTB |= IIC_SCL_PB; IicDelayService(IIC_DEL_WAIT); PORTB &= ~IIC_SCL_PB;//清时钟线，钳住I2C总线以便继续接收 asm("NOP"); } unchar IicSendByteService(unchar tx_data) {//将字节发送出去,可以是地址,也可以是数据,发完后等待应答并返回 unchar bit_count,ack_flag; for(bit_count=0;bit_count<8;bit_count++) { if((tx_data<<bit_count)&0x80) PORTB |= IIC_SDA_PB; else PORTB &= ~IIC_SDA_PB; IicDelayService(IIC_DEL_WAIT); PORTB |= IIC_SCL_PB; //置时钟线为高，通知被控器开始接收数据位 IicDelayService(IIC_DEL_WAIT); //保证时钟高电平周期大于4μs PORTB &= ~IIC_SCL_PB; } IicDelayService(IIC_DEL_WAIT); PORTB &= ~IIC_SDA_PB; DDRB &= ~IIC_SDA_PB; //SDA置成输入 asm("NOP"); PORTB |= IIC_SCL_PB; IicDelayService(IIC_DEL_WAIT); IicDelayService(IIC_DEL_WAIT); if(PINB&IIC_SDA_PB) //判断是否接收到应答信号 ack_flag=NO; else ack_flag=YES; //有应答信号 DDRB |= IIC_SDA_PB; PORTB &= ~IIC_SCL_PB; asm("NOP"); return(ack_flag); } unchar IicAccByteService(void) {//接收从器件传来的数据,并判断总线错误 unchar bit_count,get_data; DDRB &= ~IIC_SDA_PB; get_data=0; for(bit_count=0;bit_count<8;bit_count++) { asm("NOP"); PORTB &= ~IIC_SCL_PB; //置时钟线为低，准备接收数据位 IicDelayService(IIC_DEL_WAIT); //时钟低电平周期大于4.7μs; PORTB |= IIC_SCL_PB; //置时钟线为高使数据线上数据有效 get_data<<=1; if(PINB&IIC_SDA_PB) get_data++; asm("NOP"); asm("NOP"); } PORTB &= ~IIC_SCL_PB; DDRB |= IIC_SDA_PB; asm("NOP"); return(get_data); } unchar RandWriteByteTo24c256(unchar sla_add,unint addr_op,unchar data_op) { unchar result_now,temp_data; IicStartBitSend(); //起始条件 temp_data=sla_add; //从器件地址 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); temp_data=addr_op>>8; //操作单元地址高8位 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); temp_data=addr_op; //操作单元地址低8位 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); temp_data=data_op; //操作数据 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); IicStopBitSend(); //停止条件 IicDelayService(IIC_DEL_WRITE); result_now=YES; return(result_now); } unchar SeqReadFrom24c256(unchar sla_add,unint addr_op,unchar read_size,unchar *read_buf) {//addr “roll over” during read:from last byte of the last page, to the first byte of the first page unchar result_now,temp_data,read_count; IicStartBitSend(); //起始条件 temp_data=sla_add; //从器件地址 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); temp_data=addr_op>>8; //操作单元地址高8位 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); temp_data=addr_op; //操作单元地址低8位 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); IicStartBitSend(); temp_data=sla_add+1; //读操作 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); for(read_count=0;read_count<read_size-1;read_count++) { //连续读数据 *(read_buf+read_count)=IicAccByteService(); IicAckService(NO); } *(read_buf+read_count)=IicAccByteService(); IicAckService(YES); IicStopBitSend(); result_now=YES; return(result_now); } unchar WritePageTo24c256(unchar sla_add,unint addr_op,unchar *write_data_buf) {//页写 unchar count,result_now,temp_data; IicStartBitSend(); //起始条件 temp_data=sla_add; //从器件地址 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); temp_data=addr_op>>8; //操作单元地址高8位 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); temp_data=addr_op; //操作单元地址低8位 result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); for(count=0;count<PAGE_CAP_BYTE;count++) {//连续写 temp_data=*(write_data_buf+count); result_now=IicSendByteService(temp_data); if(result_now==NO) return(result_now); } IicStopBitSend(); //停止条件 IicDelayService(IIC_DEL_WRITE); result_now=YES; return(result_now); } unchar SeqWriteTo24c256ByPage(unchar sla_add,unint addr_op,unchar write_size,unchar *write_buf) {//addr “roll over” during write:from last byte of the current page to first byte of the same page. unint page_write,read_addr,temp_op_int; unchar data_count,result_out,modify_count,count,write_data_buf[PAGE_CAP_BYTE]; result_out=YES; data_count=0; while(write_size>0) { page_write=addr_op/PAGE_CAP_BYTE; //得到当前页 read_addr=page_write*PAGE_CAP_BYTE; SeqReadFrom24c256(sla_add,read_addr,PAGE_CAP_BYTE,write_data_buf); temp_op_int=addr_op&(PAGE_CAP_BYTE-1); //得到在页内的起始字节地址 if(temp_op_int+write_size>=PAGE_CAP_BYTE) { modify_count=PAGE_CAP_BYTE; addr_op=(page_write+1)*PAGE_CAP_BYTE; //写下一页的起始地址 } else modify_count=write_size; count=temp_op_int; write_size=write_size-modify_count+count; //写下一页的数据量 for(;count<modify_count;count++,data_count++) write_data_buf[count]=*(write_buf+data_count); result_out=WritePageTo24c256(sla_add,read_addr,write_data_buf); } return(result_out); } unchar SeqWriteTo24c256(unchar sla_add,unint addr_op,unchar write_size,unchar *write_buf) {//连续写(非页写) unchar write_result; if(write_size<3) {//如果要写入的数据小于3个,则用随机写实现 write_result=RandWriteByteTo24c256(sla_add,addr_op,*write_buf); write_result=RandWriteByteTo24c256(sla_add,addr_op+1,*(write_buf+1)); } else write_result=SeqWriteTo24c256ByPage(sla_add,addr_op,write_size,write_buf); return(write_result); }
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发表于 2024-4-8 11:02:40
