freescale單片機(jī)單精度浮點(diǎn)與16進(jìn)制與ascii之間的轉(zhuǎn)換

float BallData[8] = {-8.925133};

unsigned char *f2char;

unsigned char ControlData[64];

void float2uchar2ascii(void)

{

unsigned char i = 0;

f2char = &BallData;//float to unsiged char[]

//8個floatd對應(yīng)于32個unsigned char,所以f2char為32位

//f2char[32]={0xC10EDC58,0xC10EDC58,0xC10EDC58,0xC10EDC58,...,0xC10EDC58}

for(i=0;i<32;i++)

{

ControlData[2*i ] = f2char[i]/16+(f2char[i]/16>9?55:48);//unsigned char to ascii char

ControlData[2*i+1] = f2char[i]+(f2char[i]>9?55:48);

//本例中，f2char[0]=0xC1，要把它轉(zhuǎn)換為ascii碼字符串首先要得到高四位，然后得到低四位

//如果四位的值大于9，則應(yīng)轉(zhuǎn)換為字母a~f，否則應(yīng)轉(zhuǎn)換為0~9

//字母的應(yīng)該在結(jié)果上+55，因?yàn)閍的ascii碼為65，基數(shù)為10，于是加55

//數(shù)字的應(yīng)該在結(jié)果上+48，因?yàn)?的ascii碼為48，基數(shù)為00，于是加48

}

}

//---將ascii碼字符串轉(zhuǎn)換成單精度浮點(diǎn)

unsigned char ControlData[64]={"C10EDC58"};

float BallData[8];

void asciistring2single(void)

{

unsigned char i=0,k=0;

unsigned char temp[4];

for(i=0;i<64;i++)

{

temp[i]=ControlData[i%4];

if(i%4==3)

{

BallData[k++]=(*((float*)temp));

}

}

}

//---將16進(jìn)制與float之間的轉(zhuǎn)換

union f_to_char

{

uchar chr[4];

float ft0;

} test;//定義一個union，直接對test.float操作，即從chr[4]中得到16進(jìn)制的數(shù)組；反之亦然

test.ft0=3.14;//→chr[4]={0x40,0x48,0xF5,0xC3};