本帖最后由 guyuemao 于 2017-5-27 10:06 编辑
一、实验目的：学习独立按键封装以及多个按键组合。
二、实验环境：FPGA开发板AX301,Quartus ii
三、实验介绍：通过按下开发板上的按键，LED灯做出相应的回应。如按下KEY2 ,占空比增加10/255
按下KEY4 ,占空比减小10/255
按下KEY3 ,占空比变为127/255≈50%
四、源码
module key_interface_demo
(
input CLK,
input RSTn,
input Key_In,
output LED
);
/******************************************/
wire Key_Out;
key_interface U1
(
.CLK( CLK ),
.RSTn( RSTn ),
.Key_In( Key_In ), // input - from top
.Key_Out( Key_Out ) // output - to U2
);
/******************************************/
optional_pwm_module U2
(
.CLK( CLK ),
.RSTn( RSTn ),
.Option_Key( Key_Out ), // input - from U1
.LED( LED ) // output - to top
);
/******************************************/
endmodule
module key_interface
(
input CLK,
input RSTn,
input Key_In,
output Key_Out
);
// Up Down Left Right Middle
//key2 up
//key3 Middle
//key4 Dwon
// LED0
/******************************************/
debounce_module2 U1_Up // Debounded key up
(
.CLK( CLK ),
.RSTn( RSTn ),
.Pin_In( Key_In ),
.Pin_Out( Key_Out )
);
/******************************************/
debounce_module2 U2_Down // Debounded key down
(
.CLK( CLK ),
.RSTn( RSTn ),
.Pin_In( Key_In ),
.Pin_Out( Key_Out )
);
/******************************************/
debounce_module2 U3_Left // Debounded key left
(
.CLK( CLK ),
.RSTn( RSTn ),
.Pin_In( Key_In ),
.Pin_Out( Key_Out )
);
/******************************************/
debounce_module2 U4_Right // Debounded key right
(
.CLK( CLK ),
.RSTn( RSTn ),
.Pin_In( Key_In ),
.Pin_Out( Key_Out )
);
/******************************************/
debounce_module2 U5_Middle // Debounded key middle
(
.CLK( CLK ),
.RSTn( RSTn ),
.Pin_In( Key_In ),
.Pin_Out( Key_Out )
);
/******************************************/
endmodule
module optional_pwm_module
(
input CLK,
input RSTn,
input Option_Key,
output LED
);
/*******************************/
parameter SEGMENT = 8'd195; // 3.9us 50M*(3.9*e-6)=195
/*******************************/
reg C1;
always @ ( posedge CLK or negedge RSTn )
if( !RSTn )
C1 <= 8'd0;
else if( C1 == SEGMENT )
C1 <= 8'd0;
else
C1 <= C1 + 1'b1;
/*******************************/
reg System_Seg;
always @ ( posedge CLK or negedge RSTn )
if( !RSTn )
System_Seg <= 8'd0;
else if( System_Seg == 8'd255 )
System_Seg <= 8'd0;
else if( C1 == SEGMENT )
System_Seg <= System_Seg + 1'b1;
/*******************************/
reg Option_Seg;
always @ ( posedge CLK or negedge RSTn )
if( !RSTn )
Option_Seg <= 8'd0;
else if( Option_Key ) // Key up = Segment + 10
if( Option_Seg < 8'd245) Option_Seg <= Option_Seg + 8'd10;
else Option_Seg <= 8'd255;
else if( Option_Key ) // key down = Segment - 10
if( Option_Seg > 8'd10) Option_Seg <= Option_Seg - 8'd10;
else Option_Seg <= 8'd0;
else if( Option_Key ) // key left = Segment + 1
if( Option_Seg < 8'd255) Option_Seg <= Option_Seg + 8'd1;
else Option_Seg <= 8'd255;
else if( Option_Key ) // key down = Segment - 1
if( Option_Seg > 8'd0) Option_Seg <= Option_Seg - 8'd1;
else Option_Seg <= 8'd0;
else if( Option_Key ) // key middle = Segment = half
Option_Seg <= 8'd127;
/******************************************/
assign LED = ( System_Seg < Option_Seg ) ? 1'b1 : 1'b0;
/******************************************/
endmodule
五、RTL图
本帖最后由 guyuemao 于 2017-5-27 10:06 编辑
一、实验目的：学习独立按键封装以及多个按键组合。
二、实验环境：FPGA开发板AX301,Quartus ii
三、实验介绍：通过按下开发板上的按键，LED灯做出相应的回应。如按下KEY2 ,占空比增加10/255
按下KEY4 ,占空比减小10/255
按下KEY3 ,占空比变为127/255≈50%
四、源码
module key_interface_demo
(
input CLK,
input RSTn,
input Key_In,
output LED
);
/******************************************/
wire Key_Out;
key_interface U1
(
.CLK( CLK ),
.RSTn( RSTn ),
.Key_In( Key_In ), // input - from top
.Key_Out( Key_Out ) // output - to U2
);
/******************************************/
optional_pwm_module U2
(
.CLK( CLK ),
.RSTn( RSTn ),
.Option_Key( Key_Out ), // input - from U1
.LED( LED ) // output - to top
);
/******************************************/
endmodule
module key_interface
(
input CLK,
input RSTn,
input Key_In,
output Key_Out
);
// Up Down Left Right Middle
//key2 up
//key3 Middle
//key4 Dwon
// LED0
/******************************************/
debounce_module2 U1_Up // Debounded key up
(
.CLK( CLK ),
.RSTn( RSTn ),
.Pin_In( Key_In ),
.Pin_Out( Key_Out )
);
/******************************************/
debounce_module2 U2_Down // Debounded key down
(
.CLK( CLK ),
.RSTn( RSTn ),
.Pin_In( Key_In ),
.Pin_Out( Key_Out )
);
/******************************************/
debounce_module2 U3_Left // Debounded key left
(
.CLK( CLK ),
.RSTn( RSTn ),
.Pin_In( Key_In ),
.Pin_Out( Key_Out )
);
/******************************************/
debounce_module2 U4_Right // Debounded key right
(
.CLK( CLK ),
.RSTn( RSTn ),
.Pin_In( Key_In ),
.Pin_Out( Key_Out )
);
/******************************************/
debounce_module2 U5_Middle // Debounded key middle
(
.CLK( CLK ),
.RSTn( RSTn ),
.Pin_In( Key_In ),
.Pin_Out( Key_Out )
);
/******************************************/
endmodule
module optional_pwm_module
(
input CLK,
input RSTn,
input Option_Key,
output LED
);
/*******************************/
parameter SEGMENT = 8'd195; // 3.9us 50M*(3.9*e-6)=195
/*******************************/
reg C1;
always @ ( posedge CLK or negedge RSTn )
if( !RSTn )
C1 <= 8'd0;
else if( C1 == SEGMENT )
C1 <= 8'd0;
else
C1 <= C1 + 1'b1;
/*******************************/
reg System_Seg;
always @ ( posedge CLK or negedge RSTn )
if( !RSTn )
System_Seg <= 8'd0;
else if( System_Seg == 8'd255 )
System_Seg <= 8'd0;
else if( C1 == SEGMENT )
System_Seg <= System_Seg + 1'b1;
/*******************************/
reg Option_Seg;
always @ ( posedge CLK or negedge RSTn )
if( !RSTn )
Option_Seg <= 8'd0;
else if( Option_Key ) // Key up = Segment + 10
if( Option_Seg < 8'd245) Option_Seg <= Option_Seg + 8'd10;
else Option_Seg <= 8'd255;
else if( Option_Key ) // key down = Segment - 10
if( Option_Seg > 8'd10) Option_Seg <= Option_Seg - 8'd10;
else Option_Seg <= 8'd0;
else if( Option_Key ) // key left = Segment + 1
if( Option_Seg < 8'd255) Option_Seg <= Option_Seg + 8'd1;
else Option_Seg <= 8'd255;
else if( Option_Key ) // key down = Segment - 1
if( Option_Seg > 8'd0) Option_Seg <= Option_Seg - 8'd1;
else Option_Seg <= 8'd0;
else if( Option_Key ) // key middle = Segment = half
Option_Seg <= 8'd127;
/******************************************/
assign LED = ( System_Seg < Option_Seg ) ? 1'b1 : 1'b0;
/******************************************/
endmodule
五、RTL图
Eagleson
2017-05-27
