Function: Digital tube display 4X4 keyboard matrix keys PROTEUS and 51 single chip microcomputer tutorial
The program source code is as follows:
/*
Digital tube display 4X4 keyboard matrix buttons
*/
#include typedef unsigned char uint8; typedef unsigned int uint16; #define BUZZER() P3 ^= 0x01 code uint8 LED_CODE[] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07, 0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71}; void delay(uint16 x) { uint16 i,j; for(i = x; i > 0; i --) for(j = 114; j > 0; j --); } uint8 Pre_KeyNO = 16,KeyNO = 16; void Keys_Scan() { uint8 Tmp; P1 = 0x0f; delay(1); Tmp = P1 ^ 0x0f; //High 4 bits output, low 4 bits input switch(Tmp) { case 1: KeyNO = 0; break; case 2: KeyNO = 1; break; case 4: KeyNO = 2; break; case 8: KeyNO = 3; break; default: KeyNO = 16; } P1 = 0xf0; delay(1); Tmp = P1 >> 4 ^ 0x0f; // High 4 bits input, low 4 bits output switch(Tmp) { case 1: KeyNO += 0; break; case 2: KeyNO += 4; break; case 4: KeyNO += 8; break; case 8: KeyNO += 12; } } void Beep() { uint8 i; for(i=0;i<100;i++) { delay(1);BUZZER(); } } void main() { P0 = 0x00; while(1) { P1 = 0xf0; if(P1 != 0xf0) Keys_Scan(); if(Pre_KeyNO != KeyNO) { P0 = LED_CODE[KeyNO]; Beep(); Pre_KeyNO = KeyNO; } delay(10); } }
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