給你一個矩陣鍵盤4×4異組非順序端口讀寫程序示例參考
- #include <STC15F2K60S2.H>
- #define uint unsigned int
- #define uchar unsigned char
- #define PD ((P2<<3&0x80)|(P2<<4&0x40)|(P3&0x3f))//P2.4/P2.2+P3.0~3.5
- sbit dula=P2^6; //573段選
- sbit wela=P2^7; //573位選
- uchar code table[]={ //數組
- 0x3f,0x06,0x5b,0x4f,
- 0x66,0x6d,0x7d,0x07,
- 0x7f,0x6f,0x77,0x7c,
- 0x39,0x5e,0x79,0x71};
- uchar data dis_buf[2];
- uchar key=0;
- bit wei=0;
- void PX(uchar x)
- {
- P3&=0xc0; //低6位清0，P36、37不變
- P3|=(x&0x3f); //P3低6位賦值
- P2&=0xeb; //P2.4、2.2清0，其它位不變
- P2|=((x>>3&0x10)|(x>>4&0x04));//P2.4、2.2賦值
- }
- void keyscan() //按鍵掃描程序
- {
- static bit sign=0; //按鍵自鎖標志
- static uint count=0; //消抖計數變量
- uchar num=0; //臨時變量
- PX(0xf0); //賦值PX 1111 0000
- if(PD!=0xf0) //檢測有按鍵按下
- {
- if((++count>=100)&&(sign==0)) //100~1000，根據主循環周期調整約10~20ms
- {
- sign=1; //按鍵自鎖標志置1
- num=PD; //保存PD值xxxx 0000，x為0或1
- num|=0x0f; //保存num按位或0x0f值xxxx 1111
- PX(num); //賦值PX xxxx 1111
- num=PD; //保存PD xxxx xxxx
- switch(num)
- {
- case 0xee: key= 1; break;
- case 0xde: key= 2; break;
- case 0xbe: key= 3; break;
- case 0x7e: key= 4; break;
- case 0xed: key= 5; break;
- case 0xdd: key= 6; break;
- case 0xbd: key= 7; break;
- case 0x7d: key= 8; break;
- case 0xeb: key= 9; break;
- case 0xdb: key=10; break;
- case 0xbb: key=11; break;
- case 0x7b: key=12; break;
- case 0xe7: key=13; break;
- case 0xd7: key=14; break;
- case 0xb7: key=15; break;
- case 0x77: key=16; break;
- }
- }
- }
- else //鍵抬起
- {
- sign=0; //按鍵自鎖標志清0
- count=0; //消抖計數清0
- }
- }
- int main()
- {
- while(1)
- {
- keyscan();
- dis_buf[0]=table[key/10];
- dis_buf[1]=table[key%10];
- P0=0x00;//消隱
- dula=1;
- dula=0;
- if(wei==0)
- {
- P0=0xfe;//送位碼
- wela=1;
- wela=0;
- P0=dis_buf[0];//送段碼
- dula=1;
- dula=0;
- wei=1;
- }
- else
- {
- P0=0xfd;
- wela=1;
- wela=0;
- P0=dis_buf[1];
- dula=1;
- dula=0;
- wei=0;
- }
- }
- }
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