Through the design of the single-chip computer course, master the programming method of C language, connect the theory to practice, and improve our brain and hands-on ability. Control the design of 4 LED scrolling and flashing systems through timers, master the use of timing/counters, and write simple programs to ultimately improve our logic abstraction capabilities.
The timer of the C language programming of the single chip computer controls 4 LEDs to scroll and flashMCU timer control 4 LED scrolling flashing schematic
MCU timer control 4 LED scrolling program design
/* Name: Timer Control 4 LEDs Scrolling
Note: 4 LEDs flash under the timer control.
*/
#include"reg51.h"
#define uchar unsigned char
#define uint unsigned int
Sbit B1=P0^0;
Sbit G1=P0^1;
Sbit R1=P0^2;
Sbit Y1=P0^3;
Uint i,j,k;
/ / Main program
Void main()
{
i=j=k=0;
P0=0xff;
TMOD=0x02; //Timer 0 working mode 2
TH0=256-200; //200us timing
TL0=256-200;
IE=0x82;
TR0=1; //Start timer
}while(1);
//T0 interrupt function
Void LED_Flash_and_Scroll() interrupt 1
{
If (++k "35) return; / / timed interrupt after several executions flashing
k=0;
Switch(i)
{
Case 0: B1=~B1;break;
Case 1: G1=~G1;break;
Case 2: R1=~R1;break;
Case 3: Y1=~Y1;break;
Default:i=0;
}
If(++j"300) return; //each flashes for a while
j=0;
P0=0xff; close display
i++; //Switch to the next LED
}
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