The following is the C language source program:
#include #define uint unsigned int #define uchar unsigned char uintled[]={0xc0,0xf9,0xa4, 0xb0,0x99,0x92,0x82,0xf8,0x80,0x90, 0x88,0x83,0xc6,0xa1,0x86,0x8e}; uchar a,b,c,temp; void delay7ms(void) //error -0.217013888891us { unsigned char a,b; for(b=208;b>0;b--) for(a=14;a>0;a--); } ucharkey() { P1=0x0f; if(P1!=0x0f) { delay7ms(); if(P1!=0x0f); P1=0xfe; a=P1^0xfe; switch(a) { case 0x80:c=0;break; case 0x40:c=1;break; case 0x20:c=2;break; case 0x10:c=3;break; } temp=P1; while(temp!=0xfe) { temp=P1; } } P1=0x0f; if(P1!=0x0f) { delay7ms(); if(P1!=0x0f); P1=0xfd; a=P1^0xfd; switch(a) { case 0x80:c=4;break; case 0x40:c=5;break; case 0x20:c=6;break; case 0x10:c=7;break; } temp=P1; while(temp!=0xfd) { temp=P1; } } P1=0x0f; if(P1!=0x0f) { delay7ms(); if(P1!=0x0f); P1=0xfb; a=P1^0xfb; switch(a) { case 0x80:c=8;break; case 0x40:c=9;break; case 0x20:c=10;break; case 0x10:c=11;break; } temp=P1; while(temp!=0xfb) { temp=P1; } } P1=0x0f; if(P1!=0x0f) { delay7ms(); if(P1!=0x0f); P1=0xf7; a=P1^0xf7; switch(a) { case 0x80:c=12;break; case 0x40:c=13;break; case 0x20:c=14;break; case 0x10:c=15;break; } temp=P1; while(temp!=0xf7) { temp=P1; } } return c; } void main(void) { while(1) { P2=led[b]; b=key(); } }
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