//=========================
//Project: Key pad detect program
//Author: Leo.Tseng
//Date: 2011/12/06
//MCU: W78E054D
//CRYSTAL: 25Mhz
//Description: Use uart for output, set boudrate=9600,
// Decode KEY pad, this program could support
// 4X4 KEY pad array.
//=========================
#include <reg52.h>
#include <stdio.h>
// 變數宣告
sbit UP = P1^2; // LED1
sbit DOWN = P1^3; // LED2
sbit LEFT = P1^4; // LED3
sbit RIGHT = P1^5; // LED4
sbit SCAN0 = P2^7; // KEY SCAN0
sbit SCAN1 = P2^6; // KEY SCAN1
sbit SCAN2 = P2^5; // KEY SCAN2
sbit SCAN3 = P2^4; // KEY SCAN3
sbit DET3 = P2^3; // KEY DETECT0, always high
sbit DET2 = P2^2; // KEY DETECT2
sbit DET1 = P2^1; // KEY DETECT1
sbit DET0 = P2^0; // KEY DETECT0
int n_SCAN;
int TIMES=65536; // 16位元計數器
int PWMHIGH=1;
int PWMLOW=50000;
int PERIOD;
unsigned KEY,temp;
//副程式宣告
void TIMER1_initinal(int baudrate);
void delay (int j);
//主程式開始
void main(void)
{
TIMER1_initinal(9600); // 使用UART,baudrate=9600
PERIOD=TIMES-PWMHIGH;
TMOD = (TMOD & 0xF0) | 0x01; // Set T/C0 Mode
TH0= PERIOD/256; // load sampleing rate
TL0= PERIOD%256; //
ET0 = 1; // Enable Timer 0 Interrupts
TR0 = 1; // Start Timer 0 Running
EA = 1; // Global Interrupt Enable
printf("\n7 KEY Detect Program\n\n");
SCAN0=SCAN1=SCAN2=SCAN3=1;
DET3=DET2=DET1=DET0=1; // 設定成輸入pin
n_SCAN=0;
UP=DOWN=LEFT=RIGHT=0;
while(1)
{
if((P2&0xFF)!=0xFF) // 偵測是否按按鍵?
{
temp=P2&0xFF; // 第一次儲存按鍵值
delay(6000); // 延遲 0.48us*6000=2.88ms,防彈跳調整
KEY=P2&0xFF; // 第二次讀取按鍵值
if (KEY&&temp) // 判別是否為同一鍵
{
delay(6000);
switch(KEY)
{
case 0x7B: printf("SW20 pressed, code=0x7B\n");
UP^=1;
break;
case 0x7D: printf("SW15 pressed, code=0x7D\n");
LEFT^=1;
break;
case 0x7E: printf("SW19 pressed, code=0x7E\n");
UP=DOWN=LEFT=RIGHT=1;
break;
case 0xBD: printf("SW14 pressed, code=0xBD\n");
DOWN^=1;
break;
case 0xBE: printf("SW18 pressed, code=0xBE\n");
DOWN^=!(UP^=1); // binary down counter
LEFT^=(!DOWN && !UP);
RIGHT^=(!LEFT && !DOWN && !UP);
break;
case 0xDE: printf("SW17 pressed, code=0xDE\n");
DOWN^=UP^=1; // binary up counter
LEFT^=(DOWN && UP);
RIGHT^=(LEFT && DOWN && UP);
break;
case 0xEE: printf("SW16 pressed, code=0xEE\n");
RIGHT^=1;
break;
default: break;
}
//delay(6000);
}
}
}
}
//UART副程式
void TIMER1_initinal(int baudrate)
{
PCON = 0x00; // PCON: if SMOD=1(b7), Baud Rate is Doubled
SCON = 0x52; // SCON: mode 1, 8-bit UART, enable rcvr
TMOD = 0x20; // TMOD: timer 1, mode 2, 8-bit reload
//TH1 = 256-(11059200/384/baudrate); // TH1: reload value for baud @ 11.0592MHz, TH=0xFD
TH1 = 256-(25000000/372/baudrate); // TH1: reload value for baud @ 25MHz, TH=0xF9
TR1 = 1; // TR1: timer 1 run
//TI = 1; // TI: set TI to send first char of UART
}
//計時器0中斷1
void timer0_ISR(void) interrupt 1
{
if((SCAN0==1)&&(SCAN1&&SCAN2&&SCAN3)&&(n_SCAN==0))
{
TR0=0;
SCAN0=0;
PERIOD = TIMES-PWMLOW;
TH0= PERIOD/256;
TL0= PERIOD%256;
TR0=1;
}
else if((SCAN0==0)&&(SCAN1&&SCAN2&&SCAN3)&&(n_SCAN==0))
{
TR0=0;
n_SCAN=1; // 準備掃瞄列1
SCAN0=1;
PERIOD = TIMES-PWMHIGH;
TH0= PERIOD/256;
TL0= PERIOD%256;
TR0=1;
}
if((SCAN1==1)&&(SCAN0&&SCAN2&&SCAN3)&&(n_SCAN==1))
{
TR0=0;
SCAN1=0;
PERIOD = TIMES-PWMLOW;
TH0= PERIOD/256;
TL0= PERIOD%256;
TR0=1;
}
else if((SCAN1==0)&&(SCAN0&&SCAN2&&SCAN3)&&(n_SCAN==1))
{
TR0=0;
n_SCAN=2; // 準備掃瞄列2
SCAN1=1;
PERIOD = TIMES-PWMHIGH;
TH0= PERIOD/256;
TL0= PERIOD%256;
TR0=1;
}
if((SCAN2==1)&&(SCAN0&&SCAN1&&SCAN3)&&(n_SCAN==2))
{
TR0=0;
SCAN2=0;
PERIOD = TIMES-PWMLOW;
TH0= PERIOD/256;
TL0= PERIOD%256;
TR0=1;
}
else if((SCAN2==0)&&(SCAN0&&SCAN1&&SCAN3)&&(n_SCAN==2))
{
TR0=0;
n_SCAN=3; // 準備掃瞄列3
SCAN2=1;
PERIOD = TIMES-PWMHIGH;
TH0= PERIOD/256;
TL0= PERIOD%256;
TR0=1;
}
if((SCAN3==1)&&(SCAN0&&SCAN1&&SCAN2)&&(n_SCAN==3))
{
TR0=0;
SCAN3=0;
PERIOD = TIMES-PWMLOW;
TH0= PERIOD/256;
TL0= PERIOD%256;
TR0=1;
}
else if((SCAN3==0)&&(SCAN0&&SCAN1&&SCAN2)&&(n_SCAN==3))
{
TR0=0;
n_SCAN=0; // 準備掃瞄列0
SCAN3=1;
PERIOD = TIMES-PWMHIGH;
TH0= PERIOD/256;
TL0= PERIOD%256;
TR0=1;
}
}
void delay (int j)
{
while(j)
j--;
}
//======== CONSOLE MESSAGE =======
7 KEY Detect Program
SW20 pressed, code=0x7B
SW14 pressed, code=0xBD
SW15 pressed, code=0x7D
SW16 pressed, code=0xEE
SW17 pressed, code=0xDE
SW18 pressed, code=0xBE
SW19 pressed, code=0x7E
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