51 single chip microcomputer to realize the water lamp

Before implementing the running light, we need to mention that before writing the C51 code, you need to refer to the circuit diagram. Take the running light as an example. Let's look at Figure 2. The positive poles of the eight LEDs are connected to the +5V voltage through a bus. Looking at Figure 1 again, we can see that the negative poles of the eight LEDs are connected to the 8 I/O ports of LED and P2. According to the conduction condition of the diode, the LED can only be lit when the IO port of the microcontroller outputs a low level.

Paste the code below:

#include

#define uchar  unsigned char

#define uint   unsigned int 

sbit LED1 = P2^0;

sbit LED2 = P2^1;

sbit LED3 = P2^2;

sbit LED4 = P2^3;

sbit LED5 = P2^4;

sbit LED6 = P2^5;

sbit LED7 = P2^6;

sbit LED8 = P2^7;

/* ********************************************* */

// Function name: Delay()

// Function: millisecond delay

/* ********************************************* */

void delay(uint z)

{

uint x,y;

for(x = 0; x < z; x++)

for(y = 0; y < 113; y++);

}

// Function name: main()

// Function: Make an LED light flash

void main(void)

{

while(1)

{

LED1 = 0; //light on

delay(1000); //Continue on for 1s

LED1 = 1; //light off

delay(1000); //Continue to turn off for 1s

LED2 = 0;

delay(1000);

LED2 = 1;

delay(1000);

LED3 = 0;

delay(1000);

LED3 = 1;

delay(1000);

LED4 = 0; //light on

delay(1000); //Continue on for 1s

LED4 = 1; //light off

delay(1000); //Continue to turn off for 1s

LED5 = 0;

delay(1000);

LED5 = 1;

delay(1000);

LED6 = 0;

delay(1000);

LED6 = 1;

delay(1000);

LED7 = 0;

delay(1000);

LED7 = 1;

delay(1000);

}

}

After reading the first two circuit diagrams, you will probably understand what the code means. First, use the second method of using sbit: sbit bit variable name = SFR name ^ variable bit address value, for example: sbit LED1 = P2^0, which means that LED1 is defined as the first bit of P2 port for bit operation.

Then we wrote a millisecond delay function. Of course, the so-called delay here is an inaccurate delay. It is the "1 second" we tested after some debugging. If we want to truly and accurately achieve a one-second delay, we must also use a timer. Since the requirement here is not so accurate, we can use the millisecond delay function to achieve it.

Finally, our main function is the function function. As far as the MCU is concerned, we all know that the biggest function of the MCU is control, and the control of the MCU is also reflected in the output of high and low levels. The reason why the MCU can achieve so many functions is also due to the surrounding expansion modules. In C51, 1 is a high level and 0 is a low level, which means off and on for LED lights. In addition, we also call the delay function to realize the running light.

(Link: https://pan.baidu.com/s/1CtSpgtdKuNh5P3CmCqHuwA Extraction code: nb2i)

Finally, I would like to remind everyone that the C51 code should be analyzed based on the specific circuit diagram of the specific microcontroller model. Do not copy it !!!