查看ShiftOut()的源代碼

<pre style="color:blue">
void shiftOut (uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, byte val)    
</pre>
位移輸出函數(shù) <br>

輸入value數(shù)據(jù)后Arduino會自動把數(shù)據(jù)移動分配到8個并行輸出端. 其中dataPin為連接DS的引腳號, clockPin為連接SH_CP的引腳號, bitOrder為設(shè)置數(shù)據(jù)位移順序, 分別為高位先入MSBFIRST或者低位先入LSBFIRST.<br>


參數(shù):<br>
*dataPin  數(shù)據(jù)引腳  
*clockPin  時鐘引腳  
*bitOrder  移位順序 ( MSBFIRST 或 LSBFIRST)
*val  數(shù)據(jù)
<br>
<pre style="color:green">
// Do this for MSBFIRST serial
int data = 500;
// shift out highbyte
shiftOut(dataPin, clock, MSBFIRST, (data >> 8));  
// shift out lowbyte
shiftOut(dataPin, clock, MSBFIRST, data);

// Or do this for LSBFIRST serial
data = 500;
// shift out lowbyte
shiftOut(dataPin, clock, LSBFIRST, data);  
// shift out highbyte
shiftOut(dataPin, clock, LSBFIRST, (data >> 8)); 
</pre>