ShiftOut()

void shiftOut (uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, byte val)    

位移輸出函數(shù)

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為設置數(shù)據(jù)位移順序, 分別為高位先入MSBFIRST或者低位先入LSBFIRST.

參數(shù):

• 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)

// 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));