verilogPS2键盘解码源程序

之前探讨过PS/2键盘编解码以及数据传输协议，这次自己动手实现了利用FPGA接收键盘编码，然后通过串口传输到PC。做的比较简单，只是通过FPGA把大写字母A-Z转换成相应的ASCII码，只要字母按键被按下，就能在串口调试助手里显示相应大写字母。下面就共享代码吧！ 除了顶层模块，三个底层模块分别为PS/2传输处理模块、串口传输模块以及串口波特率选择模块（下面只给出顶层模块和PS/2传输处理模块的verilog代码）。module ps2_key(clk,rst_n,ps2k_clk,ps2k_data,rs232_tx);input clk; //50M时钟信号input rst_n; //复位信号input ps2k_clk; //PS2接口时钟信号input ps2k_data; //PS2接口数据信号output rs232_tx; // RS232发送数据信号wire[7:0] ps2_byte; // 1byte键值wire ps2_state; //按键状态标志位wire bps_start; //接收到数据后，波特率时钟启动信号置位wire clk_bps; // clk_bps的高电平为接收或者发送数据位的中间采样点 ps2scan ps2scan( .clk(clk), //按键扫描模块 .rst_n(rst_n), .ps2k_clk(ps2k_clk), .ps2k_data(ps2k_data), .ps2_byte(ps2_byte), .ps2_state(ps2_state) ); speed_select speed_select( .clk(clk), .rst_n(rst_n), .bps_start(bps_start), .clk_bps(clk_bps) );my_uart_tx my_uart_tx( .clk(clk), .rst_n(rst_n), .clk_bps(clk_bps), .rx_data(ps2_byte), .rx_int(ps2_state), .rs232_tx(rs232_tx), .bps_start(bps_start) ); Endmodule module ps2scan(clk,rst_n,ps2k_clk,ps2k_data,ps2_byte,ps2_state);input clk; //50M时钟信号input rst_n; //复位信号input ps2k_clk; //PS2接口时钟信号input ps2k_data; //PS2接口数据信号output[7:0] ps2_byte; // 1byte键值，只做简单的按键扫描output ps2_state; //键盘当前状态，ps2_state=1表示有键被按下 //------------------------------------------reg ps2k_clk_r0,ps2k_clk_r1,ps2k_clk_r2; //ps2k_clk状态寄存器//wire pos_ps2k_clk; // ps2k_clk上升沿标志位wire neg_ps2k_clk; // ps2k_clk下降沿标志位always @ (posedge clk or negedge rst_n) begin if(!rst_n) begin ps2k_clk_r0 = 1'b0; ps2k_clk_r1 = 1'b0; ps2k_clk_r2 = 1'b0; end else begin //锁存状态，进行滤波 ps2k_clk_r0 = ps2k_clk; ps2k_clk_r1 = ps2k_clk_r0; ps2k_clk_r2 = ps2k_clk_r1; endendassign neg_ps2k_clk = ~ps2k_clk_r1 ps2k_clk_r2; //下降沿//------------------------------------------reg[7:0] ps2_byte_r; //PC接收来自PS2的一个字节数据存储器reg[7:0] temp_data; //当前接收数据寄存器reg[3:0] num; //计数寄存器always @ (posedge clk or negedge rst_n) begin if(!rst_n) begin num = 4'd0; temp_data = 8'd0; end else if(neg_ps2k_clk) begin //检测到ps2k_clk的下降沿 case (num) 4'd0: num = num+1'b1; 4'd1: begin num = num+1'b1; temp_data[0] = ps2k_data; //bit0 end 4'd2: begin num = num+1'b1; temp_data[1] = ps2k_data; //bit1 end 4'd3: begin num = num+1'b1; temp_data[2] = ps2k_data; //bit2 end 4'd4: begin num = num+1'b1; temp_data[3] = ps2k_data; //bit3 end 4'd5: begin num = num+1'b1; temp_data[4] = ps2k_data; //bit4 end 4'd6: begin num = num+1'b1; temp_data[5] = ps2k_data; //bit5 end 4'd7: begin num = num+1'b1; temp_data[6] = ps2k_data; //bit6 endDIY机械键盘相关社区:机械键盘DIY

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