LED working conditions
The operating voltage drop of ordinary light-emitting diodes is 1.6V – 2.1V
Working current 1-20mA
Here I = U/R = 3mA
Light up the LED
Here, you only need to control the P1 port to output a low level to light up the LED (that is, assign a value of 0 to the P1 port during programming).
MCU Programming
/***Light up the third and sixth lights***/
#include sbit LED3 = P1^2; //bit defines the third light sbit LED6 = P1^5; //The sixth light void main(){ LED3 = 0 ; LED6 = 0; } If there are many lights, the above method is too troublesome Can be rewritten as the following code #include void main(){ P1 = 0xdb; //1101 1011 } LED water light Delay function /*Custom delay function delay (milliseconds)*/ void delay(unsigned int z){ unsigned int x,y; for (x=z;x>0;x--) for (y=114;y>0;y--); Circular shift function #include #include /*Custom delay function delay (milliseconds)*/ void delay(unsigned int z){ unsigned int x,y; for (x=z;x>0;x--) for (y=114;y>0;y--); } void main(){ unsigned int defult; defult = 0xfe ; //1111 1110 while (1){ defult = _crol_(defult,1); //left shift _crol_(variable, number of shifts) right shift _cror_() P1 = defult; delay(100); P1 = 0xff; //1111 1111 delay(10); } } Difference between shift function and shift operator
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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