单片机C程序：求下面这个单片机IIC总线C程序的详细解释

IIC协议有讲的，橘租每一次传输都有

起始

应答

错误

总线忙

非圆猜兆应答

等信号格式

NoACK就是非应答，兆侍他告诉iic传输的是最后一个数据，TestAck()

是发送一个字后等待从机应答

你这个例程应该是用io口模仿正数i2c,这里你没有给出sda的定义。我理解还有程序对其进行判断if(sda==1)输出念穗编码‘1’else 输出编码‘0’。经过for循环8次就输出了一个完整的8bit二进制数。比如temp=num=0x25sda=0x25&0x80就等于‘0x00’，这时io口输出‘0’，temp=temp<<1数据左移1位temp此时等于0x4a,再&0x80，经过8次移位io口输出的数据应该是00100101=0x25,这个数据传仔清卜输结束

#include"reg52.h"

#include"24c02.h"

#include"lcm.h"

#define max_freq 108000

#define min_freq 87500

unsigned char radio_write_data[5]={0xb1,0xa0,0x20,0x11,0x00} //要写入TEA5767的数据

unsigned char radio_write_data1[5]={0x31,0xa0,0x20,0x11,0x00} //要写入TEA5767的数据

unsigned char radio_read_data[5] /察陵/TEA5767读出的状态

unsigned int default_pll=0x29c2//0x29f9 //默认存台的pll,87.8MHz

unsigned int pll=0

float frequency=0

void get_frequency(void)

extern void sta()

extern void wrbyt(unsigned char byt)

extern bit iic_testack()

extern void mack()

extern void stop()

extern unsigned char rdbyt()

extern uchar frq[10]

sbit ds_1302=P1^5

void radio_write(void)

{

unsigned char i

stop()

sta()

wrbyt(0xc0) //洞粗TEA5767写地址

if(!iic_testack())

{

for(i=0i<5i++)

{

wrbyt(radio_write_data1[i])

mack()

}

}

stop()

}

//读TEA5767状态,并转换成频率

void radio_read(void)

{

unsigned char i

unsigned char temp_l,temp_h

pll=0

stop()

sta()

wrbyt(0xc1) //TEA5767读地址

if(!iic_testack())

{

for(i=0i<5i++)

{

radio_read_data[i]=rdbyt()

mack()

}

}

stop()

temp_l=radio_read_data[1]

temp_h=radio_read_data[0]

temp_h&=0x3f

pll=temp_h*256+temp_l

get_frequency()

}

//由频率计算PLL

void get_pll(void)

{

unsigned char hlsi

unsigned int twpll=0

hlsi=radio_write_data[2]&0x10

if (hlsi)

pll=(unsigned int)((float)((frequency+225)*4)/纳没镇(float)32.768) //频率单位:k

else

pll=(unsigned int)((float)((frequency-225)*4)/(float)32.768) //频率单位:k

}

//由PLL计算频率

void get_frequency(void)

{

unsigned char hlsi

unsigned int npll=0

npll=pll

hlsi=radio_write_data[2]&0x10

if (hlsi)

frequency=(unsigned long)((float)(npll)*(float)8.192-225) //频率单位:KHz

else

frequency=(unsigned long)((float)(npll)*(float)8.192+225) //频率单位:KHz

}

//手动设置频率,mode=1,+0.1MHzmode=0:-0.1MHz ,不用考虑TEA5767用于搜台的相关位:SM,SUD

void search(bit mode)

{

radio_read()

if(mode)

{

frequency+=50

if(frequency>max_freq)

frequency=min_freq

}

else

{

frequency-=50

if(frequency<min_freq)

frequency=max_freq

}

EA=0

get_pll()

radio_write_data1[0]=pll/256

radio_write_data1[1]=pll%256

radio_write_data1[2]=0x20

radio_write_data1[3]=0x11

radio_write_data1[4]=0x00

radio_write()

EA=1

}

void set_frq(uchar *frq_m)

{

EA=0

frequency=(float)((*frq_m)*1000+(*(frq_m+1))*100+(*(frq_m+2))*10+(*(frq_m+3)))*100

if((frequency<87500)||(frequency>108500))

{

EA=1

*frq_m=0

*(frq_m+1)=0

*(frq_m+2)=0

*(frq_m+3)=0

return

}

get_pll()

radio_write_data1[0]=pll/256

radio_write_data1[1]=pll%256

radio_write_data1[2]=0x20

radio_write_data1[3]=0x11

radio_write_data1[4]=0x00

radio_write()

EA=1

}

void auto_search(uchar dec)

{

int k=0

unsigned char aa[6]={0}

ds_1302=0

radio_write()

if(dec)

{

while(frequency<max_freq)

{

get_pll()

radio_write_data1[0]=pll/256

radio_write_data1[1]=pll%256

radio_write_data1[2]=0xA0

radio_write_data1[3]=0x11

radio_write_data1[4]=0x00

radio_write_data1[0]|=0x40

radio_write()

for(k=0k<20000k++)

EA=0

radio_read()

if((radio_read_data[0]&0x80))

{

EA=0

frequency+=50

return

}

}

frequency=min_freq

}

else

{

while(frequency>min_freq)

{

get_pll()

radio_write_data1[0]=pll/256

radio_write_data1[1]=pll%256

radio_write_data1[2]=0x20

radio_write_data1[3]=0x11

radio_write_data1[4]=0x00

radio_write_data1[0]|=0x40

radio_write()

for(k=0k<20000k++)

EA=0

radio_read()

if((radio_read_data[0]&0x80))

{

EA=0

frequency-=50

return

}

}

frequency=max_freq

}

}

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