Use C language to light up an LED light on the at89c51 microcontroller

With c, I think about it:

1. It has something to do with hardware, do you know this?

2. Suppose the LED is connected to the P1 port. The first light is connected. The cathode is connected to IO, and the anode is connected to 5V.

#include

bitsecflag;

unsigned

charms;

voiddisplay(unsigned

charnum,unsigned

charsec)

num%=8;

p1=~(1<

8;tl0=-50000;

ms++;IF(ms>20) 12MHz, 50ms timing interrupt, 1 second timing.

It's easy to expand any of the flashing lights you want.

display(2,1);

display(1,1);

display(3,2);

display(1,2);

Just put it in while. Have fun.

The assembler takes the AT89C51 microcontroller as the core to design the lantern controller, and the 8-way lantern connected to the P1 port is lit up in the way shown in the figure below.

89c51.The P2 port controls 8 LED lights, which are cyclically shifted to the right during normal operation, and 8 LED lights flash when interrupting (INT1).

Hello dear, glad to answer for you: 89c51The P2 port controls 8 LED lights, and the cycle shifts right during normal operation, and when interrupted (INT1), the 8 LED lights flash as follows:

The positive stage of the 8 LED lamps is connected to the top of the finger shed, and the negative pole is connected to the top respectively, P1 = 0xff; (P1 port all high) P2 = 0x00; (P2 port is all low), at this time, the current flows through P1 port through the LED to P2 port, all 8 lights are lit, if P1 remains unchanged, P2 = 0xff; At this time, because the interfaces of P1 and P2 are all high, there is no voltage difference and no current, and the LEDs are all off, if you want a certain light to be lit, you can follow the 8421 rule, is the high 8 bits, is the low 8 bits 8 4 2 1 8 4 4 2 1 When P1 = 0xff; p2 = 0xfe, that is, the small light is on, the other 7 are off, p2 = 0xfe this f is 8 + 4 + 2 + 1 = 15, corresponding to the f in the hexadecimal system, the same way e = 8 + 4 + 2 + 0 = 14, spike pulse corresponds to the e in the hexadecimal system.

I can send it to you if you want. I have written it in C. With a countdown timer, and the time can be set through the serial port.

It looks like the homework assigned by the teacher.

It's so simple, you don't always ask you about your homework, I remember that there is a saying in the back door of our university, the market economy doesn't believe in tears.