單片機任意IO組合實現矩陣按鍵的程序

ID:734940 · 發表于 2022-11-13 22:51

單片機源程序如下:

#include "STC32G.h"
sbit C4 = P2^7;
sbit C3 = P2^6;
sbit C2 = P2^5;
sbit C1 = P2^4;
sbit R1 = P2^3;
sbit R2 = P2^2;
sbit R3 = P2^1;
sbit R4 = P4^1;
//理論可以使用任意io，不僅限P0、P1 ……
unsigned char S16 = 0;
bit _1msPast = 0;
bit busy;//串口忙
bit keypressed = 0;//有鍵按下位
//僅支持單按鍵,鍵在松開后執行操作。
void KeyScan()
{ //每個毫秒掃描一次，
unsigned char keys;//檢測到按下的鍵值
static unsigned char pressMscount,looseMscount,pressednum;//按下毫秒計數，松開毫秒計數，按下的鍵值
C1 = C2 = C3 = C4 = 1;
R1 = R2 = R3 = R4 = 0;
keys = !C1 * 1 + !C2 * 2 + !C3 * 3 + !C4 * 4;
C1 = C2 = C3 = C4 = 0;
R1 = R2 = R3 = R4 = 1;
keys += !R1 * 0 + !R2 * 4 + !R3 * 8 + !R4 * 12;
C1 = C2 = C3 = C4 = R1 = R2 = R3 = R4 = 0;
if(keys != 0)
{
//當有鍵按下時，
if(keypressed == 0)
//如果鍵按下標志位為0，則說明突然有鍵按下，開始按下消抖計時
{
pressMscount += 1;
while(pressMscount == 25)
{
//計數達到25時確定有鍵按下，置keypressed位為1
keypressed = 1;
pressMscount = 0;
pressednum = keys;
}
}
}
else
{//如果無鍵按下，或者處于抖動狀態，則清除計數
//如果剛剛處于有鍵按下狀態,則說明到達按鍵松開階段，鍵按下標志取消
if(keypressed == 1)
{
looseMscount +=1;
while(looseMscount == 25)
{
//計數達到25時確定按鍵已松開，置keypressed位為0，發送剛剛按下的按鍵
keypressed = 0;
looseMscount = 0;
S16 = pressednum;
//松開抖動
}
}else if(keypressed == 0){
//如果按下標志位為0，可能是處于無鍵按下狀態，或者處于按下抖動狀態
pressMscount = 0;
}
}
}
//定時器0設置
void T0Set()
{
AUXR &= 0x7F; //定時器時鐘12T模式
TMOD &= 0xF0; //設置定時器模式
TL0 = 0x33; //設置定時初始值
TH0 = 0xF5; //設置定時初始值 //1毫秒@33.1776MHz
TF0 = 0; //清除TF0標志
TR0 = 1; //啟動定時器
}
//在定時器0里進行毫秒累加
void T0Action() interrupt 1
{
_1msPast = 1;
}
//在main里監測到毫秒累加為1時執行動作，并歸零毫秒累加。
void DealTimeInMain()
{
while(_1msPast == 1)
{
KeyScan();
_1msPast = 0;
}
}
//================================
//發送字節
void SendData(char dat)
{
while (busy); //Wait for the completion of the previous data is sent
ACC = dat;
if (P) //Set the parity bit according to P
{
TB8 = 1; //Set parity bit to 1
}
else
{
TB8 = 0; //Set parity bit to 0
}
busy = 1;
SBUF = ACC; //Send data to UART buffer
}
char putchar(char c)
{
SendData(c);
return c;
}
//串口1配置
void UartInit()
{
SCON = 0x50; //8位數據,可變波特率
AUXR &= 0xBF; //定時器時鐘12T模式
AUXR &= 0xFE; //串口1選擇定時器1為波特率發生器
TMOD &= 0x0F; //設置定時器模式
TL1 = 0xFA; //設置定時初始值
TH1 = 0xFF; //設置定時初始值
ET1 = 0; //禁止定時器%d中斷
TR1 = 1; //定時器1開始計時
busy = 0;
}
//串口通信
void UartIsr() interrupt 4
{
if (RI)
{
RI = 0; //Clear receive interrupt flag
}
if (TI)
{
TI = 0; //Clear transmit interrupt flag
busy = 0; //Clear transmit busy flag
}
}
void main()
{
EAXFR = 1;
P0M0 = 0x00;
P0M1 = 0x00;
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;
P6M0 = 0x00;
P6M1 = 0x00;
P7M0 = 0x00;
P7M1 = 0x00;
UartInit();
T0Set();
// IT0 = 1;
ET0 = 1; //使能定時器0中斷
ES = 1; //使能串口1中斷
EA = 1; //使能總中斷
while (1)
{
DealTimeInMain();
while(S16!=0)
{//檢測到按鍵，執行動作
printf("S%d被按下\r\n",S16);
S16=0;
}
}
}

復制代碼

此代碼可以直接用于STC32G屠龍刀系列，波特率33.1776，C1234 R4321分別接：
C4 → P2^7;
C3 → P2^6;
C2 → P2^5;
C1 → P2^4;
R1 → P2^3;
R2 → P2^2;
R3 → P2^1;
R4 → P4^1;

按下S1-S16，然后松開會向串口返回按下的值，僅支持單鍵按下，多鍵會返回錯誤的值。不支持長按。

ID:1042619 · 發表于 2022-11-14 11:42

感謝樓主精彩分享！另外從 STC-ISP V6.90T 以上版本的 ISP燒錄/輔助開發工具包一體化軟件的增加了I/O口配置小工具、增加將程序最小化到系統托盤區，提升幸福感小工具越來越多了.

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單片機任意IO組合實現矩陣按鍵的程序

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