//4*4矩阵键盘----------------------------------------------------------------------------------- module key44( code, col, valid, row, sys_clk, rst )//------------------------------------------------------------------------------------------------- /枯银/ Port declaration output [3:0] col output valid output [3:0] code input [3:0] row input sys_clk,rst //巧败高------------------------------------------------------------------------------------------------- // reg [3:0] col,codereg [5:0] state,next_stateparameter S_0 = 6'b000001, S_1 = 6'b000010, S_2 = 6'b000100, S_3 = 6'b001000, S_4 = 6'b010000, S_5 = 6'b100000reg S_row reg [3:0] count,row_reg,col_regreg clk2,clk4 reg [4:0] Mega_cntwire clk//------------------------------------------------------------------------------------------------- //------------------------------------------------------------------------------------------------- /孝尺/ always @( posedge sys_clk, negedge rst ) begin if(!rst) Mega_cnt<=0else Mega_cnt<=Mega_cnt+1end assign clk = Mega_cnt[4]//------------------------------------------------------------------------------------------------- // Frequency Division Two always @( posedge clk ) clk2 <= ~clk2// A quarter of the clk always @( posedge clk2 ) clk4 <= ~clk4//------------------------------------------------------------------------------------------------- // Check the Key //------------------------------------------------------------------------------------------------- always @( posedge clk4, negedge rst ) if(!rst) begin count <= 0S_row <= 0end else begin if(!(row[0]&row[1]&row[2]&row[3])) begin if(count <'d4) count <= count + 1// Filter else S_row <= 1end // else if(state[5]||state[0]) else if((state == S_0) || (state == S_5)) begin count <= 0S_row <= 0end end assign valid = ((state == S_1)||(state == S_2)||(state == S_3)||(state == S_4)) &&(!(row[3]&row[2]&row[1]&row[0]))//------------------------------------------------------------------------------------------------- // Save the value of row and col always @( negedge clk ) if( valid ) begin row_reg <= row col_reg <= col end /* else begin row_reg <= row_reg col_reg <= col_reg end*/ //------------------------------------------------------------------------------------------------- // Decode the Key always @( row_reg, col_reg, clk ) case( {row_reg,col_reg} ) 8'B1110_1110: code = 4'hd8'B1110_1101: code = 4'h98'B1110_1011: code = 4'h58'B1110_0111: code = 4'h1 8'B1101_1110: code = 4'he8'B1101_1101: code = 4'ha8'B1101_1011: code = 4'h68'B1101_0111: code = 4'h2 8'B1011_1110: code = 4'hf8'B1011_1101: code = 4'hb8'B1011_1011: code = 4'h78'B1011_0111: code = 4'h3 8'B0111_1110: code = 4'h08'B0111_1101: code = 4'hc8'B0111_1011: code = 4'h88'B0111_0111: code = 4'h4default : code = 4'h0endcase //------------------------------------------------------------------------------------------------- // State Machine : Mealy //------------------------------------------------------------------------------------------------- always @( posedge clk4, negedge rst ) if( !rst ) state <= S_0 else state <= next_state //------------------------------------------------------------------------------------------------- always @( state, row, S_row ) begin col = 0//---------------------------------------------- case( state ) S_0 : begin col = 4'b0000if(S_row) next_state = S_1else next_state = S_0end //---------------------------------------------- // Decoding... S_1 : begin col = 4'b1110if(row!='hf) next_state = S_5else next_state = S_2end S_2 : begin col = 4'b1101if(row!='hf) next_state = S_5else next_state = S_3end S_3 : begin col = 4'b1011if(row!='hf) next_state = S_5else next_state = S_4end S_4 : begin col = 4'b0111if(row!='hf) next_state = S_5else next_state = S_0end //---------------------------------------------- S_5 : begin col = 4'b0000if(row == 4'b1111) next_state = S_0else next_state = S_5end default: next_state = S_0endcase end endmodule#include<stdio.h>
#include<reg51.h>
#define uchar unsigned char
uchar key
int i=0
char b[4]={'0','0','0','0'}//输入的密码放这里和初始的比较来判断是否密码正确
void keyscan() //扫描按键是否按下
{
uchar temp
P3=0xfe //扫描第一行
temp=P3
temp=temp&0xf0
if(temp!=0xf0) //判断按键是否按毁迟下
{
delayms(10)//去抖纤虚李动
temp=P3
temp=temp&0xf0
if(temp!=0xf0)//确认按键按下
{
temp=P3
switch(temp)
{
case 0xee:key='0'break
case 0xde:key='1'break
case 0xbe:key='2'break
case 0x7e:key='3'break
}
while(temp!=0xf0) //判断按键是否松开
{
temp=P3
temp=temp&0xf0
}
b[i]=keyi++if(i==3)i=0
}
}
P3=0xfd //扫描第二行
temp=P3
temp=temp&0xf0
if(temp!=0xf0)
{
delayms(10)
temp=P3
temp=temp&0xf0
if(temp!=0xf0)
{
temp=P3
switch(temp)
{
case 0xed:key='4'break
case 0xdd:key='5'break
case 0xbd:key='6'break
case 0x7d:key='7'break
}
while(temp!=0xf0)
{
temp=P3
temp=temp&0xf0
}
b[i]=keyi++if(i==3)i=0
}
}
P3=0xfb //扫描第三行
temp=P3
temp=temp&0xf0
if(temp!=0xf0)
{
delayms(10)
temp=P3
temp=temp&0xf0
if(temp!=0xf0)
{
temp=P3
switch(temp)
{
case 0xeb:key='8' break
case 0xdb:key='誉档9' break
case 0xbb:key='A'break
case 0x7b:key='B'break
}
while(temp!=0xf0)
{
temp=P3
temp=temp&0xf0
}
b[i]=keyi++if(i==3)i=0
}
}
P3=0xf7 //扫描第四行
temp=P3
temp=temp&0xf0
if(temp!=0xf0)
{
delayms(10)
temp=P3
temp=temp&0xf0
if(temp!=0xf0)
{
temp=P3
switch(temp)
{
case 0xe7:key='C'break
case 0xd7:key='D'break
case 0xb7:key='E'break
case 0x77:key='F'break
}
while(temp!=0xf0)
{
temp=P3
temp=temp&0xf0
}
b[i]=keyi++if(i==3)i=0
}
}
}
main()
{
char a[4]={'3','5','A','C'}//这个做初始密码
while(1)//无限循环，保证了b 0-3 四个数有值
{
keyscan()
if(a[0]==b[0]&&a[1]==b[1]&&a[2]==b[2]&&a[3]==b[3])
{
//这里写密码正确程序要怎么处理
}
}
}
#define uint unsigned int
#define uchar unsigned char
#define Key_Scanf P1 //4X4按键显示；
#define Print_Out P0 //显示数字P0；
#define PORT P2 /茄绝/数码选择；
#define SYSLED P0^7//系统指示灯；
uchar code table[]={0xff,0x4f,0x12,0x06,0x4c,0x24,0x20,0x0f,0x00,0x0c,0x01} //0~9数字
void display(uchar) //显示
void delay_50us(uint t) //延时50微秒,防抖动
uchar keyscan(void) //键盘
void SYS_LED(void) //指示灯
uchar a=0
uchar keynum
void delay_50us(uint t)
{
uchar j
for(t>0t--)
for(j=19j>0j--)
}
void SYS_LED()
{
SYSLED = 0
delay_50us(100)
SYSLED = 1
}
void display( uchar keynum) //根据keynum返回值显示数字
{
PORT=0xfe
Print_Out=table[keynum]
}
uchar keyscan()
{
Key_Scanf=0xbf // 扫描第一横行,后四位为1,前四位线与,然后跟原来数值比较,如果不等,则把对应的数字赋给keynum
if((Key_Scanf&0xbf)!=0xbf)
{
delay_50us(100)
if((Key_Scanf&0xbf)!=0xbf)//消抖
{
SYS_LED()
a=Key_Scanf&0xbf
switch(a)
{
case 0x77:keynum=1break
case 0x7b:keynum=2break
case 0x7d:keynum=3break
default:break
}
}
}
Key_Scanf=0xdf//扫描第二横行，后四位为1，前四位线激知与；
if((Key_Scanf&0xdf)!=0xdf)
{
delay_50us(100)
if((Key_Scanf&0xdf)!=0xdf)
{
a=Key_Scanf&0xdf
switch(a)
{
case 0x7e:keynum=4break
case 0xb7:keynum=5break
case 0xbb:keynum=6break
default: break
}
}
}
Key_Scanf=0xef //扫描第三横行，后四位为1，前四位线明纳消与；
if((Key_Scanf&0xef)!=0xef)
{
delay_50us(100)
if((Key_Scanf&0xef)!=0xef)
{
a=Key_Scanf&0xef
switch(a)
{
case 0xbd:keynum=7break
case 0xbe:keynum=8break
case 0xe7:keynum=9break
default: break
}
}
}
Key_Scanf=0xf7 //扫描第四横行，后四位为1，前四位线与；
if((Key_Scanf&0xf7)!=0xf7)
{
delay_50us(100)
if((Key_Scanf&0xf7)!=0xf7)
{
a=Key_Scanf&0xf7
switch(a)
{
case 0xeb:keynum=10break
default: break
}
}
}
return keynum
}
void main(void)
{
while(1)
{
keyscan()
display(keynum)
}
}
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