基础：由PC通过UART发送数据在VGA显示。数据可以为字母，数字，汉字(任选10个字)，VGA分为左右两个区域，输入字母或者数字时在VGA左边显示，输入汉字时在VGA右边显示。

发挥：有删除功能，可通过按键删除显示的数字，字母或者汉字。左边的按键按下字母或者数字删除，右边的按键按下汉字删除。每次仅可删除一个字符。举例：VGA左侧显示FPGA 时，按下左边的键，VGA显示FPG，再按一下，显示FP。

这个思想其实很简单：

大致三个模块：

1、串口通信的接收端模块

2、字符的缓冲区

3、qvga显示屏的驱动模块

但是实现起来却不是很容易

首先我们可以知道qvga其实显示的话和数码管的显示原理差不多，这里只不过把屏幕看做一个二维的数组在每个位置写0或者1标志显示的字模。通过bgr通道进行调色。

但是这里的关键点在于如何读取到这样一个内存区域的数据

这里我想到了两个方法但是感觉工程量都很大，让我跟大家扯一下：

1、利用ip核生成一些ROM模块用于存储这几个字符的数据，然后在PC串口发送后接收到不同的标志信号然后在不同的区域读取相应的字符数据

这个方法比较省定义字符缓冲区（我自己随便叫的，就是用于存取字符的地方）的工程量，但是在不同的地方进行读取的时候觉得工程量也不小，而且自己思路比较迷没有想好如何处理，尤其是在发挥部分删除的时候，觉得思路和第二种差不多甚至更麻烦所以我个人处理的办法是第二种。

2、直接写一个字符存储的区域当接收处理端，当收到相应的字符时将相应的值传到寄存器中，然后在显示屏幕的中固定读取相应位置的数据实现字符的显示。

这里其实qvga和uart的模块早就调试好了主要问题出现在字符缓冲区中，各种小bug，真是有点让人头大·····

个人觉得自己的这个方法有点蠢，，菜鸟级别的，缺点：

1、只能显示确定的大小是字符

2、存储空间太小

3、浪费了大量的寄存器

高人指点说存储器可以用ram进行动态处理，过段时间看看ram看自己可不可以升级下自己这个蠢方案。

大致思路就是这样了：

利用发送完成位进行判断数据是否是想要的将数据写入一系列 reg中qvga模块中返回一个算是地址进行对y行扫描的时候进行寻址查码

暂时更新一份只可以读英文和数字的代码，明天估计就可以把余下的功能完善了

top.v:

module top(ext_clk_25m,ext_rst_n,uart_rx,
lcd_light_en,lcd_clk,lcd_hsy,lcd_vsy,
lcd_r,lcd_g,lcd_b);input ext_clk_25m;input ext_rst_n;input uart_rx;output lcd_light_en;output lcd_clk;output lcd_hsy;output lcd_vsy;output [4:0] lcd_r;output [5:0] lcd_g;output [4:0] lcd_b;wire [7:0]data_byte;wire rxd_finish;wire rxd_state;wire [79:0]data_db;wire [79:0]data_db_han;wire [3:0]data_ab;//接收模块rxd uut_rxd(.clk(ext_clk_25m),.rst_n(ext_rst_n),.bps_set(2'd1),.rxd(uart_rx),.data_byte(data_byte),.rxd_finish(rxd_finish),.uart_state(rxd_state));//英文数字字符缓冲区dat_buf uut_dat_buf(.clk(ext_clk_25m),.rst_n(ext_rst_n),.data_db_chars(data_db),.data_byte(data_byte),.rxd_finish(rxd_finish),.data_ab(data_ab));//汉字字符缓冲区dat_buf_han uut_dat_buf_han(.clk(ext_clk_25m),.rst_n(ext_rst_n),.data_db_chars(data_db_han),.data_byte(data_byte),.rxd_finish(rxd_finish),.rxd_state(rxd_state),.data_ab(data_ab));//qvga显示模块lcd_controller uut_lcd_conreoller(.clk(ext_clk_25m),.rst_n(ext_rst_n),.lcd_light_en(lcd_light_en),.lcd_clk(lcd_clk),.lcd_hsy(lcd_hsy),.lcd_vsy(lcd_vsy),.lcd_r(lcd_r),.lcd_g(lcd_g),.lcd_b(lcd_b),.data_db(data_db),.data_ab(data_ab),.data_db_han(data_db_han));endmodule

qvga_controller.v:

`timescale 1ns / 1ps
//
// Company:
// Engineer:
//
// Create Date:    14:05:59 01/20/2019
// Design Name:
// Module Name:    lcd_controller
// Project Name:
// Target Devices:
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//
module lcd_controller(clk,rst_n,lcd_light_en,lcd_clk,lcd_hsy,lcd_vsy,lcd_r,lcd_g,lcd_b,data_db,data_ab,data_db_han);input clk;input rst_n;input [79:0] data_db;input [79:0] data_db_han;output [3:0]data_ab;output lcd_light_en;output lcd_clk;output reg lcd_hsy;output reg lcd_vsy;output [4:0] lcd_r;output [5:0] lcd_g;output [4:0] lcd_b;parameter HSY_TH=9'D408-1'D1;//周期parameter HSY_THS=9'D30     ;//脉冲宽度parameter HSY_THB=9'D38     ;//后沿parameter HSY_TEP=9'D320    ;//显示周期parameter HSY_THE=9'D68     ;//同步周期parameter HSY_THF=9'D20     ;//前沿parameter VSY_TV=9'D262-1'D1;//周期parameter VSY_TVS=9'D3      ;//脉冲宽度parameter VSY_TVB=9'D15     ;//后沿parameter VSY_TVD=9'D240    ;//显示周期parameter VSY_TVF=9'D4      ;//前沿//lcd背光常开assign lcd_light_en=1'b1;//配置驱动时钟6.25mHzreg [1:0] lcd_cnt;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginlcd_cnt<=1'b0;endelse beginlcd_cnt<=lcd_cnt+1'b1;endendassign lcd_clk=lcd_cnt[1];wire dchange ={lcd_cnt==2'd2};//X和Y轴计数器reg[8:0] xcnt;reg[8:0] ycnt;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginxcnt<=1'b0;endelse if(dchange==1'b1)beginif(xcnt==HSY_TH)beginxcnt<=1'b0;endelse beginxcnt<=xcnt+1'b1;endendelse;endalways@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginycnt<=1'b0;endelse if(dchange&&xcnt==HSY_TH)beginif(ycnt==VSY_TV)beginycnt<=1'b0;endelse beginycnt<=ycnt+1'b1;endendelse beginycnt<=ycnt;endend//lcd显示的有效区域reg valid;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginvalid<=1'b0;endelse if(ycnt>=(VSY_TVS+VSY_TVB)&&ycnt<(VSY_TVS+VSY_TVB+VSY_TVD)&&xcnt>=(HSY_THS+HSY_THB)&&xcnt<(HSY_TEP+HSY_THB+HSY_THE))beginvalid<=1'b1;endelse beginvalid<=1'b0;endend//LCD驱动行场同步信号产生逻辑always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginlcd_hsy<=1'b1;endelse if(xcnt==1'b0)beginlcd_hsy<=1'b0;endelse if(xcnt>=HSY_THS)beginlcd_hsy<=1'b1;endelse beginlcd_hsy<=lcd_hsy;endendalways@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginlcd_vsy<=1'b1;endelse if(ycnt==1'b0)beginlcd_vsy<=1'b0;endelse if(ycnt>=VSY_TVS)beginlcd_vsy<=1'b1;endelse beginlcd_vsy<=lcd_vsy;endendassign data_ab = ycnt-5'd18;reg [8:0]tmp_cnt;reg [8:0]tmp_cnt_0;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)begintmp_cnt<=1'b0;tmp_cnt_0<=1'b0;endelse if(valid==1'b0)begintmp_cnt<=1'b0;tmp_cnt_0<=1'b0;endelse if(xcnt>=(HSY_THS+HSY_THB)&&xcnt<(HSY_THS+HSY_THB+9'd80)&&dchange)begintmp_cnt<=tmp_cnt+1'b1;endelse if(xcnt>=((HSY_TEP/2'd2)+HSY_THS+HSY_THB)&&xcnt<((HSY_TEP/2'd2)+HSY_THS+HSY_THB+9'd80)&&dchange)begintmp_cnt_0<=tmp_cnt_0+1'b1;endelse begintmp_cnt<=tmp_cnt;tmp_cnt_0<=tmp_cnt_0;endendreg [15:0]lcd_db_rgb;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginlcd_db_rgb<=16'd0;endelse if(xcnt==(HSY_TEP/2+HSY_THB+HSY_THS))beginlcd_db_rgb[10:5]<=6'd63;endelse if(ycnt>=(VSY_TVS+VSY_TVB)&&ycnt<(VSY_TVS+VSY_TVB+9'd16)&&xcnt>=(HSY_THS+HSY_THB)&&xcnt<(HSY_THS+HSY_THB+9'd80))beginif(dchange)begin  //英文字符区域if(data_db[tmp_cnt]==1'b1)beginlcd_db_rgb<=16'h001f;endelse beginlcd_db_rgb<=16'hf800;endendelse;endelse if(ycnt>=(VSY_TVS+VSY_TVB)&&ycnt<(VSY_TVS+VSY_TVB+9'd16)&&xcnt>(HSY_TEP/2+HSY_THS+HSY_THB)&&xcnt<(HSY_TEP/2+HSY_THS+HSY_THB+9'd80))beginif(dchange)begin  //中文字符区域if(data_db_han[tmp_cnt_0]==1'b1)beginlcd_db_rgb<=16'h001f;endelse beginlcd_db_rgb<=16'hf800;endendelse;endelse beginlcd_db_rgb<=1'b0;endendassign lcd_r =valid ? lcd_db_rgb[15:11]:5'd0;assign lcd_g =valid ? lcd_db_rgb[10:5]:6'd0;assign lcd_b =valid ? lcd_db_rgb[4:0]:5'd0;endmodule

rxd.v:

module rxd(clk,rst_n,bps_set,rxd,data_byte,rxd_finish,uart_state);input           clk       ;//输入时钟input           rst_n     ;//复位信号input     [1:0] bps_set   ;//波特率选择input           rxd       ;//接收模块output    [7:0] data_byte ;//接收数据output          rxd_finish;//发送完成标志output          uart_state;//串口通信状态reg       [7:0] data_byte ;reg             rxd_finish;reg             uart_state;parameter       BPS_4800    =16'd324,BPS_9600    =16'd162,BPS_19200   =16'd80 ,BPS_115200  =16'd13 ;//消除亚稳态reg rxd_s0,rxd_s1;  //同步寄存器always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginrxd_s0<=1'b0;rxd_s1<=1'b0;endelse beginrxd_s0<=rxd;rxd_s1<=rxd_s0;endendreg rxd_temp0,rxd_temp1;//数据寄存器always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginrxd_temp0<=1'b0;rxd_temp1<=1'b0;endelse beginrxd_temp0<=rxd_s1;rxd_temp1<=rxd_temp0;endendwire rxd_negedge =~rxd_temp0&rxd_temp1;reg [15:0] div_cnt;reg [15:0] time_div;//波特率选择模块always@(*)beginif(rst_n==1'b0)begintime_div=BPS_9600;endelse begincase(bps_set)2'b00: time_div = BPS_4800;2'b01: time_div = BPS_9600;2'b10: time_div = BPS_19200;2'b11: time_div = BPS_115200;default:time_div = BPS_9600;endcaseendend//波特率计数模块always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)begindiv_cnt<=1'b0;endelse if(uart_state==1'b1)beginif(div_cnt==time_div)begindiv_cnt<=1'b0;endelse begindiv_cnt<=div_cnt+1'b1;endendelse begindiv_cnt<=1'b0;endend//波特率时钟模块reg bps_clk;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginbps_clk<=1'b0;endelse if(div_cnt==time_div)beginbps_clk<=1'b1;endelse beginbps_clk<=1'b0;endend//bps计数模块reg [7:0] bps_cnt;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginbps_cnt<=8'd0;endelse if(rxd_finish==1'b1||(bps_cnt==8'd12 && (Start>3'd3)))beginbps_cnt<=8'd0;endelse if(bps_clk==1'b1)beginbps_cnt<=bps_cnt+1'b1;endelse beginbps_cnt<=bps_cnt;endendalways@(*)beginif(rst_n==1'b0)beginrxd_finish<=1'b0;endelse if(bps_cnt==8'd159)beginrxd_finish<=1'b1;endelse beginrxd_finish<=1'b0;endend//数据缓冲区模块reg [2:0] r_data_byte[7:0];reg [2:0]Start,Stop;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginStart<=3'd0;r_data_byte[0]<=3'd0;r_data_byte[1]<=3'd0;r_data_byte[2]<=3'd0;r_data_byte[3]<=3'd0;r_data_byte[4]<=3'd0;r_data_byte[5]<=3'd0;r_data_byte[6]<=3'd0;r_data_byte[7]<=3'd0;Stop<=3'd0;endelse if(bps_clk==1'b1)beginif(bps_cnt==1'b0)beginStart<=3'd0;r_data_byte[0]<=3'd0;r_data_byte[1]<=3'd0;r_data_byte[2]<=3'd0;r_data_byte[3]<=3'd0;r_data_byte[4]<=3'd0;r_data_byte[5]<=3'd0;r_data_byte[6]<=3'd0;r_data_byte[7]<=3'd0;Stop<=3'd0;endif(16'd6<=bps_cnt&&bps_cnt<=16'd12)beginStart<=Start+rxd_s1;endelse if(16'd22<=bps_cnt&&bps_cnt<=16'd28)beginr_data_byte[0]<=r_data_byte[0]+rxd_s1;endelse if(16'd38<=bps_cnt&&bps_cnt<=16'd44)beginr_data_byte[1]<=r_data_byte[1]+rxd_s1;endelse if(16'd54<=bps_cnt&&bps_cnt<=16'd60)beginr_data_byte[2]<=r_data_byte[2]+rxd_s1;endelse if(16'd70<=bps_cnt&&bps_cnt<=16'd76)beginr_data_byte[3]<=r_data_byte[3]+rxd_s1;endelse if(16'd86<=bps_cnt&&bps_cnt<=16'd92)beginr_data_byte[4]<=r_data_byte[4]+rxd_s1;endelse if(16'd102<=bps_cnt&&bps_cnt<=16'd108)beginr_data_byte[5]<=r_data_byte[5]+rxd_s1;endelse if(16'd118<=bps_cnt&&bps_cnt<=16'd124)beginr_data_byte[6]<=r_data_byte[6]+rxd_s1;endelse if(16'd134<=bps_cnt&&bps_cnt<=16'd140)beginr_data_byte[7]<=r_data_byte[7]+rxd_s1;endelse if(16'd150<=bps_cnt&&bps_cnt<=16'd156)beginStop<=Stop+rxd_s1;endendelse;endalways@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)begindata_byte<=8'd0;endelse if(bps_cnt==8'd159)begindata_byte[0]<=(r_data_byte[0]>3'd3)?1'b1:1'b0;data_byte[1]<=(r_data_byte[1]>3'd3)?1'b1:1'b0;data_byte[2]<=(r_data_byte[2]>3'd3)?1'b1:1'b0;data_byte[3]<=(r_data_byte[3]>3'd3)?1'b1:1'b0;data_byte[4]<=(r_data_byte[4]>3'd3)?1'b1:1'b0;data_byte[5]<=(r_data_byte[5]>3'd3)?1'b1:1'b0;data_byte[6]<=(r_data_byte[6]>3'd3)?1'b1:1'b0;data_byte[7]<=(r_data_byte[7]>3'd3)?1'b1:1'b0;endelse begindata_byte<=data_byte;endendalways@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginuart_state<=1'b0;endelse if(rxd_negedge==1'b1)beginuart_state<=1'b1;endelse if(rxd_finish==1'b1||(bps_cnt==8'd12 && (Start>3'd3)))beginuart_state<=1'b0;endelse beginuart_state<=uart_state;endendendmodule

英文字符识别模块：dat_buf.v

module dat_buf(clk,rst_n,data_db_chars,data_byte,rxd_finish,data_ab);input clk;input rst_n;input [7:0]data_byte;input rxd_finish;input [3:0] data_ab;output reg [79:0]data_db_chars;reg [127:0]data_db;reg char1;parameter S0 =4'D0 ,S1 =4'D1 ,S2 =4'D2 ,S3 =4'D3 ,S4 =4'D4 ,S5 =4'D5 ,S6 =4'D6 ,S7 =4'D7 ,S8 =4'D8 ,S9 =4'D9 ,S10=4'D10,CHARS_1 =128'H000000E7424222242414141808080000,/*V*/CHARS_2 =128'H00000000000000634242424262DC0000,//uCHARS_3 =128'H0000003C4242424020100804427E0000,//2CHARS_4 =128'H0000000003020272120A0E1222770000,//kCHARS_5 =128'H000000000000003C42424242423C0000;//oreg char;reg finish_0;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginchar<=1'b0;finish_0<=1'b0;end else beginfinish_0<=rxd_finish;char<=char1;endendreg full_flag;//英文字符模块always@(*)beginif(rst_n==1'b0)begindata_db=1'b0;char1=1'b0;endelse if(finish_0==1'b0||full_flag==1'b1)begindata_db=data_db;char1=1'b0;endelse if(data_byte=="V")begindata_db=CHARS_1;char1=1'd1;endelse if(data_byte=="u")begindata_db=CHARS_2;char1=1'd1;endelse if(data_byte=="2")begindata_db=CHARS_3;char1=1'd1;endelse if(data_byte=="k")begindata_db=CHARS_4;char1=1'd1;endelse if(data_byte=="o")begindata_db=CHARS_5;char1=1'd1;endelse begindata_db=data_db;char1=1'b0;endendreg [79:0]data_db_char[15:0];//状态转换reg [3:0] state_c;reg [3:0] state_n;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginstate_c<=S0;endelse beginstate_c<=state_n;endendalways@(*)beginif(rst_n==1'b0)beginstate_n=S0;endelse begincase(state_c)S0:if(char1==1'b1)beginstate_n=S1;endelse beginstate_n=S0;endS1:if(char1==1'b1)beginstate_n=S2;endelse beginstate_n=S1;endS2:if(char1==1'b1)beginstate_n=S3;endelse beginstate_n=S2;endS3:if(char1==1'b1)beginstate_n=S4;endelse beginstate_n=S3;endS4:if(char1==1'b1)beginstate_n=S5;endelse beginstate_n=S4;endS5:if(char1==1'b1)beginstate_n=S6;endelse beginstate_n=S5;endS6:if(char1==1'b1)beginstate_n=S7;endelse beginstate_n=S6;endS7:if(char1==1'b1)beginstate_n=S8;endelse beginstate_n=S7;endS8:if(char1==1'b1)beginstate_n=S9;endelse beginstate_n=S8;endS9:if(char1==1'b1)beginstate_n=S10;endelse beginstate_n=S9;endS10:state_n=S10;default:state_n=S0;endcaseendend//输出模块always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginfull_flag=1'b0;endelse if(state_c==S10)beginfull_flag=1'b1;endelse beginfull_flag=1'b0;endend  always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)begindata_db_char[0] =1'b0;data_db_char[1] =1'b0;data_db_char[2] =1'b0;data_db_char[3] =1'b0;data_db_char[4] =1'b0;data_db_char[5] =1'b0;data_db_char[6] =1'b0;data_db_char[7] =1'b0;data_db_char[8] =1'b0;data_db_char[9] =1'b0;data_db_char[10]=1'b0;data_db_char[11]=1'b0;data_db_char[12]=1'b0;data_db_char[13]=1'b0;data_db_char[14]=1'b0;data_db_char[15]=1'b0;endelse if(char==1'b0)begin            data_db_char[0] =data_db_char[0] ;data_db_char[1] =data_db_char[1] ;data_db_char[2] =data_db_char[2] ;data_db_char[3] =data_db_char[3] ;data_db_char[4] =data_db_char[4] ;data_db_char[5] =data_db_char[5] ;data_db_char[6] =data_db_char[6] ;data_db_char[7] =data_db_char[7] ;data_db_char[8] =data_db_char[8] ;data_db_char[9] =data_db_char[9] ;data_db_char[10]=data_db_char[10];data_db_char[11]=data_db_char[11];data_db_char[12]=data_db_char[12];data_db_char[13]=data_db_char[13];data_db_char[14]=data_db_char[14];data_db_char[15]=data_db_char[15];endelse if(state_c==S1)begindata_db_char[15][7:0]=data_db[7:0];data_db_char[14][7:0]=data_db[15:8];data_db_char[13][7:0]=data_db[23:16];data_db_char[12][7:0]=data_db[31:24];data_db_char[11][7:0]=data_db[39:32];data_db_char[10][7:0]=data_db[47:40];data_db_char[9] [7:0]=data_db[55:48];data_db_char[8] [7:0]=data_db[63:56];data_db_char[7] [7:0]=data_db[71:64];data_db_char[6] [7:0]=data_db[79:72];data_db_char[5] [7:0]=data_db[87:80];data_db_char[4] [7:0]=data_db[95:88];data_db_char[3] [7:0]=data_db[103:96];data_db_char[2] [7:0]=data_db[111:104];data_db_char[1] [7:0]=data_db[119:112];data_db_char[0] [7:0]=data_db[127:120];end           else if(state_c==S2)begindata_db_char[15][15:8]=data_db[7:0];data_db_char[14][15:8]=data_db[15:8];data_db_char[13][15:8]=data_db[23:16];data_db_char[12][15:8]=data_db[31:24];data_db_char[11][15:8]=data_db[39:32];data_db_char[10][15:8]=data_db[47:40];data_db_char[9][15:8] =data_db[55:48];data_db_char[8][15:8] =data_db[63:56];data_db_char[7][15:8] =data_db[71:64];data_db_char[6][15:8] =data_db[79:72];data_db_char[5][15:8] =data_db[87:80];data_db_char[4][15:8] =data_db[95:88];data_db_char[3][15:8] =data_db[103:96];data_db_char[2][15:8] =data_db[111:104];data_db_char[1][15:8] =data_db[119:112];data_db_char[0][15:8] =data_db[127:120];endelse if(state_c==S3)begindata_db_char[15][23:16]=data_db[7:0];data_db_char[14][23:16]=data_db[15:8];data_db_char[13][23:16]=data_db[23:16];data_db_char[12][23:16]=data_db[31:24];data_db_char[11][23:16]=data_db[39:32];data_db_char[10][23:16]=data_db[47:40];data_db_char[9][23:16] =data_db[55:48];data_db_char[8][23:16] =data_db[63:56];data_db_char[7][23:16] =data_db[71:64];data_db_char[6][23:16] =data_db[79:72];data_db_char[5][23:16] =data_db[87:80];data_db_char[4][23:16] =data_db[95:88];data_db_char[3][23:16] =data_db[103:96];data_db_char[2][23:16] =data_db[111:104];data_db_char[1][23:16] =data_db[119:112];data_db_char[0][23:16] =data_db[127:120];endelse if(state_c==S4)begindata_db_char[15][31:24]=data_db[7:0];data_db_char[14][31:24]=data_db[15:8];data_db_char[13][31:24]=data_db[23:16];data_db_char[12][31:24]=data_db[31:24];data_db_char[11][31:24]=data_db[39:32];data_db_char[10][31:24]=data_db[47:40];data_db_char[9] [31:24]=data_db[55:48];data_db_char[8] [31:24]=data_db[63:56];data_db_char[7] [31:24]=data_db[71:64];data_db_char[6] [31:24]=data_db[79:72];data_db_char[5] [31:24]=data_db[87:80];data_db_char[4] [31:24]=data_db[95:88];data_db_char[3] [31:24]=data_db[103:96];data_db_char[2] [31:24]=data_db[111:104];data_db_char[1] [31:24]=data_db[119:112];data_db_char[0] [31:24]=data_db[127:120];endelse if(state_c==S5)begindata_db_char[15][39:32]=data_db[7:0];data_db_char[14][39:32]=data_db[15:8];data_db_char[13][39:32]=data_db[23:16];data_db_char[12][39:32]=data_db[31:24];data_db_char[11][39:32]=data_db[39:32];data_db_char[10][39:32]=data_db[47:40];data_db_char[9] [39:32]=data_db[55:48];data_db_char[8] [39:32]=data_db[63:56];data_db_char[7] [39:32]=data_db[71:64];data_db_char[6] [39:32]=data_db[79:72];data_db_char[5] [39:32]=data_db[87:80];data_db_char[4] [39:32]=data_db[95:88];data_db_char[3] [39:32]=data_db[103:96];data_db_char[2] [39:32]=data_db[111:104];data_db_char[1] [39:32]=data_db[119:112];data_db_char[0] [39:32]=data_db[127:120];endelse if(state_c==S6)begindata_db_char[15][47:40]=data_db[7:0];data_db_char[14][47:40]=data_db[15:8];data_db_char[13][47:40]=data_db[23:16];data_db_char[12][47:40]=data_db[31:24];data_db_char[11][47:40]=data_db[39:32];data_db_char[10][47:40]=data_db[47:40];data_db_char[9] [47:40]=data_db[55:48];data_db_char[8] [47:40]=data_db[63:56];data_db_char[7] [47:40]=data_db[71:64];data_db_char[6] [47:40]=data_db[79:72];data_db_char[5] [47:40]=data_db[87:80];data_db_char[4] [47:40]=data_db[95:88];data_db_char[3] [47:40]=data_db[103:96];data_db_char[2] [47:40]=data_db[111:104];data_db_char[1] [47:40]=data_db[119:112];data_db_char[0] [47:40]=data_db[127:120];endelse if(state_c==S7)begindata_db_char[15][55:48]=data_db[7:0];data_db_char[14][55:48]=data_db[15:8];data_db_char[13][55:48]=data_db[23:16];data_db_char[12][55:48]=data_db[31:24];data_db_char[11][55:48]=data_db[39:32];data_db_char[10][55:48]=data_db[47:40];data_db_char[9] [55:48]=data_db[55:48];data_db_char[8] [55:48]=data_db[63:56];data_db_char[7] [55:48]=data_db[71:64];data_db_char[6] [55:48]=data_db[79:72];data_db_char[5] [55:48]=data_db[87:80];data_db_char[4] [55:48]=data_db[95:88];data_db_char[3] [55:48]=data_db[103:96];data_db_char[2] [55:48]=data_db[111:104];data_db_char[1] [55:48]=data_db[119:112];data_db_char[0] [55:48]=data_db[127:120];endelse if(state_c==S8)begindata_db_char[15][63:56]=data_db[7:0];data_db_char[14][63:56]=data_db[15:8];data_db_char[13][63:56]=data_db[23:16];data_db_char[12][63:56]=data_db[31:24];data_db_char[11][63:56]=data_db[39:32];data_db_char[10][63:56]=data_db[47:40];data_db_char[9] [63:56]=data_db[55:48];data_db_char[8] [63:56]=data_db[63:56];data_db_char[7] [63:56]=data_db[71:64];data_db_char[6] [63:56]=data_db[79:72];data_db_char[5] [63:56]=data_db[87:80];data_db_char[4] [63:56]=data_db[95:88];data_db_char[3] [63:56]=data_db[103:96];data_db_char[2] [63:56]=data_db[111:104];data_db_char[1] [63:56]=data_db[119:112];data_db_char[0] [63:56]=data_db[127:120];endelse if(state_c==S9)begindata_db_char[15][71:64]=data_db[7:0];data_db_char[14][71:64]=data_db[15:8];data_db_char[13][71:64]=data_db[23:16];data_db_char[12][71:64]=data_db[31:24];data_db_char[11][71:64]=data_db[39:32];data_db_char[10][71:64]=data_db[47:40];data_db_char[9] [71:64]=data_db[55:48];data_db_char[8] [71:64]=data_db[63:56];data_db_char[7] [71:64]=data_db[71:64];data_db_char[6] [71:64]=data_db[79:72];data_db_char[5] [71:64]=data_db[87:80];data_db_char[4] [71:64]=data_db[95:88];data_db_char[3] [71:64]=data_db[103:96];data_db_char[2] [71:64]=data_db[111:104];data_db_char[1] [71:64]=data_db[119:112];data_db_char[0] [71:64]=data_db[127:120];endelse if(state_c==S10)begindata_db_char[15][79:72]=data_db[7:0];data_db_char[14][79:72]=data_db[15:8];data_db_char[13][79:72]=data_db[23:16];data_db_char[12][79:72]=data_db[31:24];data_db_char[11][79:72]=data_db[39:32];data_db_char[10][79:72]=data_db[47:40];data_db_char[9] [79:72]=data_db[55:48];data_db_char[8] [79:72]=data_db[63:56];data_db_char[7] [79:72]=data_db[71:64];data_db_char[6] [79:72]=data_db[79:72];data_db_char[5] [79:72]=data_db[87:80];data_db_char[4] [79:72]=data_db[95:88];data_db_char[3] [79:72]=data_db[103:96];data_db_char[2] [79:72]=data_db[111:104];data_db_char[1] [79:72]=data_db[119:112];data_db_char[0] [79:72]=data_db[127:120];endelse begin           data_db_char[0] =data_db_char[0] ;data_db_char[1] =data_db_char[1] ;data_db_char[2] =data_db_char[2] ;data_db_char[3] =data_db_char[3] ;data_db_char[4] =data_db_char[4] ;data_db_char[5] =data_db_char[5] ;data_db_char[6] =data_db_char[6] ;data_db_char[7] =data_db_char[7] ;data_db_char[8] =data_db_char[8] ;data_db_char[9] =data_db_char[9] ;data_db_char[10]=data_db_char[10];data_db_char[11]=data_db_char[11];data_db_char[12]=data_db_char[12];data_db_char[13]=data_db_char[13];data_db_char[14]=data_db_char[14];data_db_char[15]=data_db_char[15];endendalways@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)begindata_db_chars<=1'b0;endelse begincase(data_ab)0:data_db_chars<=data_db_char[0];1:data_db_chars<=data_db_char[1];2:data_db_chars<=data_db_char[2];3:data_db_chars<=data_db_char[3];4:data_db_chars<=data_db_char[4];5:data_db_chars<=data_db_char[5];6:data_db_chars<=data_db_char[6];7:data_db_chars<=data_db_char[7];8:data_db_chars<=data_db_char[8];9:data_db_chars<=data_db_char[9];10:data_db_chars<=data_db_char[10];11:data_db_chars<=data_db_char[11];12:data_db_chars<=data_db_char[12];13:data_db_chars<=data_db_char[13];14:data_db_chars<=data_db_char[14];15:data_db_chars<=data_db_char[15];default:data_db_chars<=1'b0;endcaseendend
endmodule

中文字符识别模块:dat_buf_han.v

module dat_buf_han(clk,rst_n,data_db_chars,data_byte,rxd_finish,rxd_state,data_ab);input clk;input rst_n;input [7:0]data_byte;input rxd_finish;input rxd_state;input [3:0] data_ab;output reg [79:0]data_db_chars;reg [255:0]data_db;reg char1;parameter S0 =4'D0 ,S1 =4'D1 ,S2 =4'D2 ,S3 =4'D3 ,S4 =4'D4 ,S5 =4'D5 ,CHECK_S0 =5'D7 ,CHECK_S1 =5'D8 ,CHECK_S2 =5'D9 ,CHECK_S3 =5'D10,CHECK_S4 =5'D11,CHECK_S5 =5'D12,SS1=5'D13,SS2=5'D14,SS3=5'D15,SS4=5'D16,SS5=5'D17,CHARS_6 =256'H020002043FE802081FC102027FE200081FC810441FC710441FC4104414440840,//清CHARS_7 =256'H001000203E40223C222023203EAE2268226822A83EA4012402220C2170280010,//昶CHARS_8 =256'H000000007FFF0020002000200FE0082008200810081008080808080405020201,//万CHARS_9 =256'H00103F1021102110217F3F102118213821543F5421122111211021103F102110,//相CHARS_10=256'H004000807FFE4002204100403FFE00200120011000900088044408221FF11020;//宏reg finish;reg finish_0;reg char;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginfinish<=1'b0;finish_0<=1'b0;char<=1'b0;end else beginfinish_0<=rxd_finish;finish<=finish_0;char<=char1;endendreg full_flag;//状态转换reg [4:0] state_c_0;reg [4:0] state_n_0;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginstate_c_0<=CHECK_S0;endelse if(rxd_state==1'b1)beginstate_c_0<=state_c_0;endelse beginstate_c_0<=state_n_0;endendalways@(*)beginif(rst_n==1'b0)beginstate_n_0=CHECK_S0;endelse begincase(state_c_0)CHECK_S0:if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endelse beginstate_n_0=CHECK_S0;endCHECK_S1:if(data_byte==8'Hf2)beginstate_n_0=SS1;endelse if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endCHECK_S2:if(data_byte==8'he0)beginstate_n_0=SS2;endelse if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endCHECK_S3:if(data_byte==8'hea)beginstate_n_0=SS3;endelse if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endCHECK_S4:if(data_byte==8'hc6)beginstate_n_0=SS4;endelse if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endCHECK_S5:if(data_byte==8'he5)beginstate_n_0=SS5;end                    else if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endSS1:if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endelse beginstate_n_0=CHECK_S0;endSS2:if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endelse beginstate_n_0=CHECK_S0;endSS3:if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endelse beginstate_n_0=CHECK_S0;endSS4:if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endelse beginstate_n_0=CHECK_S0;endSS5:if(data_byte==8'HCD)beginstate_n_0=CHECK_S1;endelse if(data_byte==8'Hcf)beginstate_n_0=CHECK_S2;endelse if(data_byte==8'Hba)beginstate_n_0=CHECK_S3;endelse if(data_byte==8'Hea)beginstate_n_0=CHECK_S4;endelse if(data_byte==8'Hc7)beginstate_n_0=CHECK_S5;endelse beginstate_n_0=CHECK_S0;enddefault:state_n_0=CHECK_S0;endcaseendend//中文字符模块always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)begindata_db=1'b0;char1=1'b0;endelse if(finish==1'b0||full_flag==1'b1)begindata_db=data_db;char1=1'b0;endelse if(state_c_0==SS1)begindata_db=CHARS_8;char1=1'b1;end         else if(state_c_0==SS2)begindata_db=CHARS_9;char1=1'b1;endelse if(state_c_0==SS3)begindata_db=CHARS_10;char1=1'b1;endelse if(state_c_0==SS4)begindata_db=CHARS_7;char1=1'b1;endelse if(state_c_0==SS5)begindata_db=CHARS_6;char1=1'b1;endelse begindata_db=data_db;char1=1'b0;end    endreg [79:0]data_db_char[15:0];//状态转换reg [3:0] state_c;reg [3:0] state_n;always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginstate_c<=S0;endelse beginstate_c<=state_n;endendalways@(*)beginif(rst_n==1'b0)beginstate_n=S0;endelse begincase(state_c)S0:if(char1==1'b1)beginstate_n=S1;endelse beginstate_n=S0;endS1:if(char1==1'b1)beginstate_n=S2;endelse beginstate_n=S1;endS2:if(char1==1'b1)beginstate_n=S3;endelse beginstate_n=S2;endS3:if(char1==1'b1)beginstate_n=S4;endelse beginstate_n=S3;endS4:if(char1==1'b1)beginstate_n=S5;endelse beginstate_n=S4;endS5:state_n=S5;default:state_n=S0;endcaseendend//输出模块always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)beginfull_flag=1'b0;endelse if(state_c==S5)beginfull_flag=1'b1;endelse beginfull_flag=1'b0;endend always@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)begindata_db_char[0] =1'b0;data_db_char[1] =1'b0;data_db_char[2] =1'b0;data_db_char[3] =1'b0;data_db_char[4] =1'b0;data_db_char[5] =1'b0;data_db_char[6] =1'b0;data_db_char[7] =1'b0;data_db_char[8] =1'b0;data_db_char[9] =1'b0;data_db_char[10]=1'b0;data_db_char[11]=1'b0;data_db_char[12]=1'b0;data_db_char[13]=1'b0;data_db_char[14]=1'b0;data_db_char[15]=1'b0;endelse if(char==1'b0)begin            data_db_char[0] =data_db_char[0] ;data_db_char[1] =data_db_char[1] ;data_db_char[2] =data_db_char[2] ;data_db_char[3] =data_db_char[3] ;data_db_char[4] =data_db_char[4] ;data_db_char[5] =data_db_char[5] ;data_db_char[6] =data_db_char[6] ;data_db_char[7] =data_db_char[7] ;data_db_char[8] =data_db_char[8] ;data_db_char[9] =data_db_char[9] ;data_db_char[10]=data_db_char[10];data_db_char[11]=data_db_char[11];data_db_char[12]=data_db_char[12];data_db_char[13]=data_db_char[13];data_db_char[14]=data_db_char[14];data_db_char[15]=data_db_char[15];endelse if(state_c==S1)begindata_db_char[15][15:0]=data_db[15:0];data_db_char[14][15:0]=data_db[31:16];data_db_char[13][15:0]=data_db[47:32];data_db_char[12][15:0]=data_db[63:48];data_db_char[11][15:0]=data_db[79:64];data_db_char[10][15:0]=data_db[95:80];data_db_char[9] [15:0]=data_db[111:96];data_db_char[8] [15:0]=data_db[127:112];data_db_char[7] [15:0]=data_db[143:128];data_db_char[6] [15:0]=data_db[159:144];data_db_char[5] [15:0]=data_db[175:160];data_db_char[4] [15:0]=data_db[191:176];data_db_char[3] [15:0]=data_db[207:192];data_db_char[2] [15:0]=data_db[223:208];data_db_char[1] [15:0]=data_db[239:224];data_db_char[0] [15:0]=data_db[255:240];end         else if(state_c==S2)begindata_db_char[15][31:16]=data_db[15:0];data_db_char[14][31:16]=data_db[31:16];data_db_char[13][31:16]=data_db[47:32];data_db_char[12][31:16]=data_db[63:48];data_db_char[11][31:16]=data_db[79:64];data_db_char[10][31:16]=data_db[95:80];data_db_char[9] [31:16]=data_db[111:96];data_db_char[8] [31:16]=data_db[127:112];data_db_char[7] [31:16]=data_db[143:128];data_db_char[6] [31:16]=data_db[159:144];data_db_char[5] [31:16]=data_db[175:160];data_db_char[4] [31:16]=data_db[191:176];data_db_char[3] [31:16]=data_db[207:192];data_db_char[2] [31:16]=data_db[223:208];data_db_char[1] [31:16]=data_db[239:224];data_db_char[0] [31:16]=data_db[255:240];endelse if(state_c==S3)begindata_db_char[15][47:32]=data_db[15:0]; data_db_char[14][47:32]=data_db[31:16];data_db_char[13][47:32]=data_db[47:32];data_db_char[12][47:32]=data_db[63:48];data_db_char[11][47:32]=data_db[79:64];data_db_char[10][47:32]=data_db[95:80];data_db_char[9] [47:32]=data_db[111:96]; data_db_char[8] [47:32]=data_db[127:112];data_db_char[7] [47:32]=data_db[143:128];data_db_char[6] [47:32]=data_db[159:144];data_db_char[5] [47:32]=data_db[175:160];data_db_char[4] [47:32]=data_db[191:176];data_db_char[3] [47:32]=data_db[207:192];data_db_char[2] [47:32]=data_db[223:208];data_db_char[1] [47:32]=data_db[239:224];data_db_char[0] [47:32]=data_db[255:240];endelse if(state_c==S4)begindata_db_char[15][63:48]=data_db[15:0]; data_db_char[14][63:48]=data_db[31:16];data_db_char[13][63:48]=data_db[47:32];data_db_char[12][63:48]=data_db[63:48];data_db_char[11][63:48]=data_db[79:64];data_db_char[10][63:48]=data_db[95:80];data_db_char[9] [63:48]=data_db[111:96]; data_db_char[8] [63:48]=data_db[127:112];data_db_char[7] [63:48]=data_db[143:128];data_db_char[6] [63:48]=data_db[159:144];data_db_char[5] [63:48]=data_db[175:160];data_db_char[4] [63:48]=data_db[191:176];data_db_char[3] [63:48]=data_db[207:192];data_db_char[2] [63:48]=data_db[223:208];data_db_char[1] [63:48]=data_db[239:224];data_db_char[0] [63:48]=data_db[255:240];endelse if(state_c==S5)begindata_db_char[15][79:64]=data_db[15:0]; data_db_char[14][79:64]=data_db[31:16];data_db_char[13][79:64]=data_db[47:32];data_db_char[12][79:64]=data_db[63:48];data_db_char[11][79:64]=data_db[79:64];data_db_char[10][79:64]=data_db[95:80];data_db_char[9] [79:64]=data_db[111:96]; data_db_char[8] [79:64]=data_db[127:112];data_db_char[7] [79:64]=data_db[143:128];data_db_char[6] [79:64]=data_db[159:144];data_db_char[5] [79:64]=data_db[175:160];data_db_char[4] [79:64]=data_db[191:176];data_db_char[3] [79:64]=data_db[207:192];data_db_char[2] [79:64]=data_db[223:208];data_db_char[1] [79:64]=data_db[239:224];data_db_char[0] [79:64]=data_db[255:240];endelse begin            data_db_char[0] =data_db_char[0] ;data_db_char[1] =data_db_char[1] ;data_db_char[2] =data_db_char[2] ;data_db_char[3] =data_db_char[3] ;data_db_char[4] =data_db_char[4] ;data_db_char[5] =data_db_char[5] ;data_db_char[6] =data_db_char[6] ;data_db_char[7] =data_db_char[7] ;data_db_char[8] =data_db_char[8] ;data_db_char[9] =data_db_char[9] ;data_db_char[10]=data_db_char[10];data_db_char[11]=data_db_char[11];data_db_char[12]=data_db_char[12];data_db_char[13]=data_db_char[13];data_db_char[14]=data_db_char[14];data_db_char[15]=data_db_char[15];endendalways@(posedge clk or negedge rst_n)beginif(rst_n==1'b0)begindata_db_chars<=1'b0;endelse begincase(data_ab)0:data_db_chars<=data_db_char[0];1:data_db_chars<=data_db_char[1];2:data_db_chars<=data_db_char[2];3:data_db_chars<=data_db_char[3];4:data_db_chars<=data_db_char[4];5:data_db_chars<=data_db_char[5];6:data_db_chars<=data_db_char[6];7:data_db_chars<=data_db_char[7];8:data_db_chars<=data_db_char[8];9:data_db_chars<=data_db_char[9];10:data_db_chars<=data_db_char[10];11:data_db_chars<=data_db_char[11];12:data_db_chars<=data_db_char[12];13:data_db_chars<=data_db_char[13];14:data_db_chars<=data_db_char[14];15:data_db_chars<=data_db_char[15];default:data_db_chars<=1'b0;endcaseendend
endmodule

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FPGA-基于UART的QVGA显示（一）（实现PC端发送字母数字汉字的分别显示）