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ps2键盘模块 [2017/06/09 17:10] anran [硬件说明] |
ps2键盘模块 [2017/06/09 17:13] (当前版本) anran [相关资料] |
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| // >>>>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<< | // >>>>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<< | ||
| // -------------------------------------------------------------------- | // -------------------------------------------------------------------- | ||
| - | // Module: Array_KeyBoard | + | // Module: Keyboard_PS2 |
| // | // | ||
| // Author: Step | // Author: Step | ||
| // | // | ||
| - | // Description: Array_KeyBoard | + | // Description: PS2 keyboard driver |
| // | // | ||
| // Web: www.stepfapga.com | // Web: www.stepfapga.com | ||
| - | // | + | // |
| // -------------------------------------------------------------------- | // -------------------------------------------------------------------- | ||
| // Code Revision History : | // Code Revision History : | ||
| // -------------------------------------------------------------------- | // -------------------------------------------------------------------- | ||
| // Version: |Mod. Date: |Changes Made: | // Version: |Mod. Date: |Changes Made: | ||
| - | // V1.0 |2015/11/11 |Initial ver | + | // V1.0 |2016/04/20 |Initial ver |
| // -------------------------------------------------------------------- | // -------------------------------------------------------------------- | ||
| - | module Array_KeyBoard # | + | module Keyboard_PS2 |
| ( | ( | ||
| - | parameter NUM_FOR_200HZ = 60000 //定义计数器cnt的计数范围，例化时可更改 | + | input clk_in, //系统时钟 |
| - | ) | + | input rst_n_in, //系统复位，低有效 |
| - | ( | + | input key_clk, //PS2键盘时钟输入 |
| - | input clk_in, //系统时钟 | + | input key_data, //PS2键盘数据输入 |
| - | input rst_n_in, //系统复位，低有效 | + | output reg key_state, //键盘的按下状态，按下为1，松开为0 |
| - | input [3:0] col, //矩阵按键列接口 | + | output reg [7:0] key_ascii //按键键值对应的ASCII编码 |
| - | output reg [3:0] row, //矩阵按键行接口 | + | |
| - | output reg [15:0] key_out //消抖后的信号 | + | |
| ); | ); | ||
| + | |||
| /* | /* | ||
| - | 因使用4x4矩阵按键，通过扫描方法实现，所以这里使用状态机实现，共分为4种状态 | + | 这个模块为FPGA驱动PS2键盘的简单程序，只能支持键盘中第一类按键的单键按动，不支持多个按键同时按动 |
| - | 在其中的某一状态时间里，对应的4个按键相当于独立按键，可按独立按键的周期采样法采样 | + | */ |
| - | 周期采样时每隔20ms采样一次，对应这里状态机每隔20ms循环一次，每个状态对应5ms时间 | + | |
| - | 对矩阵按键实现原理不明白的，请去了解矩阵按键实现原理 | + | |
| - | */ | + | |
| - | localparam STATE0 = 2'b00; | + | |
| - | localparam STATE1 = 2'b01; | + | |
| - | localparam STATE2 = 2'b10; | + | |
| - | localparam STATE3 = 2'b11; | + | |
| - | //计数器计数分频实现5ms周期信号clk_200hz | + | reg key_clk_r0 = 1'b1,key_clk_r1 = 1'b1; |
| - | reg [15:0] cnt; | + | reg key_data_r0 = 1'b1,key_data_r1 = 1'b1; |
| - | reg clk_200hz; | + | //对键盘时钟数据信号进行延时锁存 |
| - | always@(posedge clk_in or negedge rst_n_in) begin | + | always @ (posedge clk_in or negedge rst_n_in) begin |
| - | if(!rst_n_in) begin //复位时计数器cnt清零，clk_200hz信号起始电平为低电平 | + | if(!rst_n_in) begin |
| - | cnt <= 16'd0; | + | key_clk_r0 <= 1'b1; |
| - | clk_200hz <= 1'b0; | + | key_clk_r1 <= 1'b1; |
| - | end else begin | + | key_data_r0 <= 1'b1; |
| - | if(cnt >= ((NUM_FOR_200HZ>>1) - 1)) begin //数字逻辑中右移1位相当于除2 | + | key_data_r1 <= 1'b1; |
| - | cnt <= 16'd0; | + | end else begin |
| - | clk_200hz <= ~clk_200hz; //clk_200hz信号取反 | + | key_clk_r0 <= key_clk; |
| - | end else begin | + | key_clk_r1 <= key_clk_r0; |
| - | cnt <= cnt + 1'b1; | + | key_data_r0 <= key_data; |
| - | clk_200hz <= clk_200hz; | + | key_data_r1 <= key_data_r0; |
| - | end | + | |
| - | end | + | |
| end | end | ||
| + | end | ||
| - | reg [1:0] c_state; | + | //键盘时钟信号下降沿检测 |
| - | //状态机根据clk_200hz信号在4个状态间循环，每个状态对矩阵按键的行接口单行有效 | + | wire key_clk_neg = key_clk_r1 & (~key_clk_r0); |
| - | always@(posedge clk_200hz or negedge rst_n_in) begin | + | |
| - | if(!rst_n_in) begin | + | reg [3:0] cnt; |
| - | c_state <= STATE0; | + | reg [7:0] temp_data; |
| - | row <= 4'b1110; | + | //根据键盘的时钟信号的下降沿读取数据，详细参考PS2键盘数据的传输格式及时序 |
| - | end else begin | + | always @ (posedge clk_in or negedge rst_n_in) begin |
| - | case(c_state) | + | if(!rst_n_in) begin |
| - | STATE0: begin c_state <= STATE1; row <= 4'b1101; end //状态c_state跳转及对应状态下矩阵按键的row输出 | + | cnt <= 4'd0; |
| - | STATE1: begin c_state <= STATE2; row <= 4'b1011; end | + | temp_data <= 8'd0; |
| - | STATE2: begin c_state <= STATE3; row <= 4'b0111; end | + | end else if(key_clk_neg) begin |
| - | STATE3: begin c_state <= STATE0; row <= 4'b1110; end | + | if(cnt >= 4'd10) cnt <= 4'd0; |
| - | default:begin c_state <= STATE0; row <= 4'b1110; end | + | else cnt <= cnt + 1'b1; |
| - | endcase | + | case (cnt) |
| - | end | + | 4'd0: ; //起始位 |
| + | 4'd1: temp_data[0] <= key_data_r1; //数据位bit0 | ||
| + | 4'd2: temp_data[1] <= key_data_r1; //数据位bit1 | ||
| + | 4'd3: temp_data[2] <= key_data_r1; //数据位bit2 | ||
| + | 4'd4: temp_data[3] <= key_data_r1; //数据位bit3 | ||
| + | 4'd5: temp_data[4] <= key_data_r1; //数据位bit4 | ||
| + | 4'd6: temp_data[5] <= key_data_r1; //数据位bit5 | ||
| + | 4'd7: temp_data[6] <= key_data_r1; //数据位bit6 | ||
| + | 4'd8: temp_data[7] <= key_data_r1; //数据位bit7 | ||
| + | 4'd9: ; //校验位 | ||
| + | 4'd10:; //结束位 | ||
| + | default: ; | ||
| + | endcase | ||
| end | end | ||
| - | + | end | |
| - | //因为每个状态中单行有效，通过对列接口的电平状态采样得到对应4个按键的状态，依次循环 | + | |
| - | always@(negedge clk_200hz or negedge rst_n_in) begin | + | reg key_break = 1'b0; |
| - | if(!rst_n_in) begin | + | reg [7:0] key_byte = 1'b0; |
| - | key_out <= 16'hffff; | + | //根据通码和断码判定按键的当前是按下还是松开 |
| - | end else begin | + | always @ (posedge clk_in or negedge rst_n_in) begin |
| - | case(c_state) | + | if(!rst_n_in) begin |
| - | STATE0:key_out[3:0] <= col; //采集当前状态的列数据赋值给对应的寄存器位 | + | key_break <= 1'b0; |
| - | STATE1:key_out[7:4] <= col; | + | key_state <= 1'b0; |
| - | STATE2:key_out[11:8] <= col; | + | key_byte <= 1'b0; |
| - | STATE3:key_out[15:12] <= col; | + | end else if(cnt==4'd10 && key_clk_neg) begin |
| - | default:key_out <= 16'hffff; | + | if(temp_data == 8'hf0) key_break <= 1'b1; //收到段码（8'hf0）表示按键松开，设置断码标示为1 |
| - | endcase | + | else if(!key_break) begin //当断码标示为0时，表示当前数据为按下数据，输出键值并设置按下标示为1 |
| + | key_state <= 1'b1; | ||
| + | key_byte <= temp_data; | ||
| + | end else begin //当断码标示为1时，标示当前数据为松开数据，断码标示和按下标示都清零 | ||
| + | key_state <= 1'b0; | ||
| + | key_break <= 1'b0; | ||
| end | end | ||
| end | end | ||
| + | end | ||
| + | //将键盘返回的有效键值转换为按键字母对应的ASCII码值 | ||
| + | always @ (key_byte) begin | ||
| + | case (key_byte) //translate key_byte to key_ascii | ||
| + | 8'h15: key_ascii = "Q";//8'h51; //Q | ||
| + | 8'h1d: key_ascii = "W";//8'h57; //W | ||
| + | 8'h24: key_ascii = "E";//8'h45; //E | ||
| + | 8'h2d: key_ascii = "R";//8'h52; //R | ||
| + | 8'h2c: key_ascii = "T";//8'h54; //T | ||
| + | 8'h35: key_ascii = "Y";//8'h59; //Y | ||
| + | 8'h3c: key_ascii = "U";//8'h55; //U | ||
| + | 8'h43: key_ascii = "I";//8'h49; //I | ||
| + | 8'h44: key_ascii = "O";//8'h4f; //O | ||
| + | 8'h4d: key_ascii = "P";//8'h50; //P | ||
| + | 8'h1c: key_ascii = "A";//8'h41; //A | ||
| + | 8'h1b: key_ascii = "S";//8'h53; //S | ||
| + | 8'h23: key_ascii = "D";//8'h44; //D | ||
| + | 8'h2b: key_ascii = "F";//8'h46; //F | ||
| + | 8'h34: key_ascii = "G";//8'h47; //G | ||
| + | 8'h33: key_ascii = "H";//8'h48; //H | ||
| + | 8'h3b: key_ascii = "J";//8'h4a; //J | ||
| + | 8'h42: key_ascii = "K";//8'h4b; //K | ||
| + | 8'h4b: key_ascii = "L";//8'h4c; //L | ||
| + | 8'h1a: key_ascii = "Z";//8'h5a; //Z | ||
| + | 8'h22: key_ascii = "X";//8'h58; //X | ||
| + | 8'h21: key_ascii = "C";//8'h43; //C | ||
| + | 8'h2a: key_ascii = "V";//8'h56; //V | ||
| + | 8'h32: key_ascii = "B";//8'h42; //B | ||
| + | 8'h31: key_ascii = "N";//8'h4e; //N | ||
| + | 8'h3a: key_ascii = "M";//8'h4d; //M | ||
| + | default: ; | ||
| + | endcase | ||
| + | end | ||
| + | |||
| endmodule | endmodule | ||
| 行 133: | 行 175: | ||
| ====小结==== | ====小结==== | ||
| ------ | ------ | ||
| - | 本节主要为大家讲解了矩阵按键的工作原理及软件设计，需要大家掌握的同时自己创建工程，通过整个设计流程，生成FPGA配置文件加载测试。 | + | 本节主要为大家讲解了PS2接口电路、PS2键盘编码规则及使用FPGA简单驱动PS2键盘的方法，需要大家掌握的同时自己创建工程，通过整个设计流程，生成FPGA配置文件加载测试。 |
| \\ | \\ | ||
| 如果你对Diamond软件的使用不了解，请参考这里：[[lattice_diamond的使用|Diamond的使用]]。 | 如果你对Diamond软件的使用不了解，请参考这里：[[lattice_diamond的使用|Diamond的使用]]。 | ||
| 行 140: | 行 182: | ||
| ------ | ------ | ||
| \\ | \\ | ||
| - | 使用[[STEP-MXO2第二代]]的矩阵按键程序: 后续会有下载连接 待更新 | + | 使用[[STEP-MXO2第二代]]的PS2键盘驱动程序: 后续会有下载连接 待更新 |
| \\ | \\ | ||
| - | 使用[[STEP-MAX10]]的矩阵按键程序: 后续会有下载连接 待更新 | + | 使用[[STEP-MAX10]]的PS2键盘驱动程序: 后续会有下载连接 待更新 |
| \\ | \\ | ||