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源码系列:基于FPGA的数字电压表(AD)设计

源码系列:基于FPGA的数字电压表(AD)设计
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今天给大侠带来基于FPGA的数字电压表设计,附源码,获取源码,请在“FPGA技术江湖”公众号内回复“数字电压表设计源码”,可获取源码文件。话不多说,上货。

设计背景

模数转换器,又称A/D转换器,简称ADC,通常是指一个将模拟信号转换为抗干扰性更强的数字信号的电子器件。一般的ADC是将一个输入电压信号转换为一个输出的数字信号。由于数字信号本身不具有实际意义,仅仅表示一个相对大小,故任何一个ADC都需要一个参考模拟量作为转换标准。比较常见的参考标准为最大的可转换信号大小,而输出的数字量则表示输入信号相对于参考信号的大小。本设计则通过对模数转换芯片(TLC549)的采样控制,实现一个简易的数字电压表。

设计原理

TLC549典型的配置电路如下图所示:

TLC549的端口描述如下:

TLC549是一个8位的串行模数转换器,A/D转换时间最大为17us,最大转换速率为4MHz。下图为TLC549的访问时序,从图中可以看出,TLC549的使用只需对外接输入输出时钟(I/O CLK)和芯片选择(/CS)、输入的模拟信号(ANALOG IN)的控制。

分析时序图可知:当片选信号(/CS)拉低时,ADC前一次的转换数据(A)的最高位A7立即出现在数据线DATA OUT上,之后的数据在时钟I/O CLOCK的下降沿改变,可在I/O CLOCK的上升沿读取数据。转换时,/CS要置为高电平。在设计操作时,要注意Tsu(CS)、Tconv、Twh(CS)和I/O CLOCK的频率这几个参数。Tsu(CS)为CS拉低到I/O CLOCK第一个时钟到来的时间,至少要1.4us;Twh(CS)为ADC的转换时钟,不超过17us,Tconv的值也不超过17us;I/O CLOCK为 1.1MHz。其他参数可参考数据手册。

由于ADC是8位的,所以采样的电压值为:

V =(D*Vref)/256

其中V为采样的电压值;D为ADC转换后读取的8位二进制数;Vref为参考电压值,此处为2.5V。

设计架构

本设计通过调节电位器RW1改变ADC的模拟输入值,数据采样读取后由数码管显示,最后用万用表测量输入电压,并与读取在数码管上的数据(单位为mV)作比较。设计的架构图如下:

设计架构图对应端口的功能描述表:

tlc549_Driver模块采用序列机实现接口访问时序,并且产生1MHz的ADC_Clk和采集到ADC_data;Control模块,将采集到的ADC数据(ADC_data)换算成对应的电压值,并经过二进制到BCD转换以后传送到数码管;DIG_LED_DRIVE模块负责数码管的驱动,将传递过来的数据显示出来。

设计代码

AD_TLC549顶层模块代码:

module AD_TLC549(Clk,Rst_n,ADC_Din,ADC_Clk,ADC_Cs_n,Dig_Led_sel,Dig_Led_seg);  input Clk;  input Rst_n;  input ADC_Din;  output ADC_Clk;  output ADC_Cs_n;  output [2:0]Dig_Led_sel;  output [7:0]Dig_Led_seg;  wire Get_Flag;  wire [7:0]ADC_data;  wire [23:0]seg_data;  tlc549_Driver tlc549_Driver(      .Clk(Clk),    .Rst_n(Rst_n),    .En(1'b1),    .ADC_Din(ADC_Din),    .ADC_Clk(ADC_Clk),    .ADC_Cs_n(ADC_Cs_n),    .Data(ADC_data),    .Get_Flag(Get_Flag)  );  Control Control(    .Clk(Clk),    .Rst_n(Rst_n),    .Get_Flag(Get_Flag),    .ADC_data(ADC_data),    .seg_data(seg_data)  );  DIG_LED_DRIVE DIG_LED_DRIVE(    .Clk(Clk),        .Rst_n(Rst_n),        .Data(seg_data),        .Dig_Led_seg(Dig_Led_seg),    .Dig_Led_sel(Dig_Led_sel)    );endmodule 

tlc549_Driver模块代码:

moduletlc549_Driver(Clk,Rst_n,En,ADC_Din,ADC_Clk,ADC_Cs_n,Data,Get_Flag);  input Clk;  //系统50MHz时钟输入  input Rst_n;//全局复位  input En;   //ADC转换使能,高电平有效  input ADC_Din;//ADC串行数据输入  output reg ADC_Clk; //ADC时钟信号输出  output reg ADC_Cs_n;//ADC片选信号输出  output reg Get_Flag;//数据转换完成标志  output reg [7:0] Data;//ADC转换以后的电压值  reg [10:0] Cnt1;   //系统时钟计数器  reg [7:0] data_tmp;//数据寄存器  //系统时钟上升沿计数  always@(posedge Clk or negedge Rst_n)  begin     if(!Rst_n)      Cnt1 <= 11'd0;    else if(!En)      Cnt1 <= 11'd0;    else if(Cnt1 == 11'd1310)      Cnt1 <= 11'd0;    else       Cnt1 <= Cnt1 + 1'b1;    end  always@(posedge Clk or negedge Rst_n)  begin    if(!Rst_n)      begin        ADC_Clk  <= 1'b0;        ADC_Cs_n <= 1'b1;        data_tmp <= 8'd0;        Data <= 8'd0;      end    else if(En)      begin        case(Cnt1)          1    :  ADC_Cs_n <= 1'b0;  //1~71(Tsu)          71    :  begin ADC_Clk <= 1; data_tmp[7] <= ADC_Din;end          96    :  ADC_Clk <= 0;          121  :  begin ADC_Clk <= 1; data_tmp[6] <= ADC_Din;end          146  :  ADC_Clk <= 0;          171  :  begin ADC_Clk <= 1; data_tmp[5] <= ADC_Din;end          196  :  ADC_Clk <= 0;          221  :  begin ADC_Clk <= 1; data_tmp[4] <= ADC_Din;end          246  :  ADC_Clk <= 0;          271  :  begin ADC_Clk <= 1; data_tmp[3] <= ADC_Din;end          296  :  ADC_Clk <= 0;          321  :  begin ADC_Clk <= 1; data_tmp[2] <= ADC_Din;end          346  :  ADC_Clk <= 0;          371  :  begin ADC_Clk <= 1; data_tmp[1] <= ADC_Din;end          396  :  ADC_Clk <= 0;          421  :  begin ADC_Clk <= 1; data_tmp[0] <= ADC_Din;end          446  :  begin ADC_Clk <= 0; ADC_Cs_n <= 1'b1; Get_Flag<=1;end          447  :  begin Data <= data_tmp;  Get_Flag<=0; end //447~1310(Twh)          1310:  ;          default:;        endcase        end    else      begin        ADC_Cs_n <= 1'b1;        ADC_Clk <= 1'b0;      end  end endmodule
Control模块代码:
moduleControl(Clk,Rst_n,Get_Flag,ADC_data,seg_data);  input Clk;//系统时钟输入  input Rst_n;//系统复位  input Get_Flag;//ADC采集数据完成标志  input [7:0]ADC_data;//ADC采集数据输入  output reg [23:0]seg_data;//数码管待显示数据  reg [3:0]qianwei;  //千位  reg [3:0]baiwei;   //百位  reg [3:0]shiwei;   //十位  reg [3:0]gewei;    //个位  reg [15:0]tenvalue;//采样的电压值  //采集电压值计算  always@(posedge Clk or negedge Rst_n)  begin    if(!Rst_n)      tenvalue<=0;    else if(Get_Flag)//新的数据采集完成,可以进行计算      tenvalue<=(ADC_data*100*25)/256;  end     //二进制转BCD值  always@(posedge Clk or negedge Rst_n)  begin    if(!Rst_n)       begin         qianwei<=0;        baiwei<=0;        shiwei<=0;        gewei<=0;      end    else     begin       qianwei<=tenvalue/1000;     //2      baiwei<=(tenvalue/100)%10;  //5      shiwei<=(tenvalue/10)%10;   //0      gewei<=tenvalue%10;         //0    end       end   //数码管显示数值  always@(posedge Clk or negedge Rst_n)  begin    if(!Rst_n)      seg_data<=0;    else      seg_data<={            qianwei,  //千位            baiwei,   //百位            shiwei,   //十位            gewei,    //个位            8'hFF     //空闲          };  end endmodule 
DIG_LED_DRIVE模块代码:
/*数码管扫描模块,位选为外部74hc138译码器进行控制*//*仿真时请将本文件设置为顶层,并在代码中根据相应注释中的内容选择cnt1_MAX = 24*/  module DIG_LED_DRIVE(Clk,Rst_n,Data,Dig_Led_seg,Dig_Led_sel);  input Clk;       //系统时钟输入  input Rst_n;     //系统复位  input [23:0]Data;//待显示数据  output [7:0]Dig_Led_seg;//数码管段选  output [2:0]Dig_Led_sel;//数码管位选  parameter system_clk = 50_000_000;    localparam cnt1_MAX = 24;/*仿真的时候使用,板级验证时请注释掉*///localparam cnt1_MAX = system_clk/1000/2-1;/*板级验证的时候使用,仿真时请注释掉*/  reg [14 :0] cnt1;  //分频计数器  reg clk_1K;      //扫描时钟,1KHz  reg [2:0]sel_r;    //数码管位选  reg [7:0]seg_r;    //数码管段选  reg [3:0]disp_data;  //单位显示数据缓存//1KHz时钟分频计数器  always@(posedge Clk)  beginif(!Rst_n)cnt1<=0;elseif(cnt1==cnt1_MAX)cnt1<=0;else cnt1<=cnt1+1'b1;  end  //得到1KHz时钟  always@(posedge Clk or negedge Rst_n)  begin    if(!Rst_n)      clk_1K<=0;    else if(cnt1==cnt1_MAX)      clk_1K<=~clk_1K;  end   //位选信号控制  always@(posedge clk_1K or negedge Rst_n)  begin    if(!Rst_n)      sel_r<=3'd0;elseif(sel_r == 3'd3)      sel_r<=3'd0;else      sel_r<=sel_r+1'b1;  end   //根据不同的数码管位选择不同的待显示数据  always@(*)  begin    if(!Rst_n)      disp_data=4'd0;else      begincase(sel_r)3'd0:disp_data=Data[23:20];          3'd1:disp_data=Data[19:16];3'd2:disp_data=Data[15:12];          3'd3:disp_data=Data[11:8];3'd4:disp_data=Data[7:4];          3'd5:disp_data=Data[3:0];default :disp_data=4'd0;        endcase      end  end   //数据译码,将待显示数据翻译为符合数码管显示的编码  always@(*)  begin      if(!Rst_n)      seg_r=8'hff;else      begincase(disp_data)4'd0:    seg_r=8'hc0;4'd1:    seg_r=8'hf9;4'd2:    seg_r=8'ha4;4'd3:    seg_r=8'hb0;4'd4:    seg_r=8'h99;4'd5:    seg_r=8'h92;4'd6:    seg_r=8'h82;4'd7:    seg_r=8'hf8;4'd8:    seg_r=8'h80;4'd9:    seg_r=8'h90;4'd10:  seg_r=8'h88;4'd11:  seg_r=8'h83;4'd12:  seg_r=8'hc6;4'd13:  seg_r=8'ha1;4'd14:  seg_r=8'h86;4'd15:  seg_r=8'h8e;default : seg_r=8'hff;        endcase      end  end   assign Dig_Led_seg = seg_r;  assign Dig_Led_sel = sel_r;endmodule
仿真测试
AD_TLC549_tb顶层测试代码如下:
`timescale 1ns/1psmodule AD_TLC549_tb;  reg Clk;  reg Rst_n;  reg ADC_Din;  wire ADC_Clk;  wire ADC_Cs_n;  wire [2:0] Dig_Led_sel;  wire [7:0] Dig_Led_seg;  initial begin    Clk = 1;    Rst_n = 0;    ADC_Din = 0;    #200.1     Rst_n = 1;    #1400 ADC_Din=1; //aa    #1000 ADC_Din=0;    #1000 ADC_Din=1;    #1000 ADC_Din=0;    #1000 ADC_Din=1;    #1000 ADC_Din=0;    #1000 ADC_Din=1;    #1000 ADC_Din=0;      #17000     #1400 ADC_Din=1; //98    #1000 ADC_Din=0;    #1000 ADC_Din=0;    #1000 ADC_Din=1;    #1000 ADC_Din=1;    #1000 ADC_Din=0;    #1000 ADC_Din=0;    #1000 ADC_Din=0;    //#20000 $stop;  end   AD_TLC549 AD_TLC549_dut(    .Clk(Clk),    .Rst_n(Rst_n),    .ADC_Din(ADC_Din),    .ADC_Clk(ADC_Clk),    .ADC_Cs_n(ADC_Cs_n),    .Dig_Led_sel(Dig_Led_sel),    .Dig_Led_seg(Dig_Led_seg)  );  always #10 Clk = ~Clk;endmodule
仿真图如下所示:
观察仿真图,实现了数据的采集,并正确显示,下板验证结果也达到了设计的预期效果。

END

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  1. CONNECT:[ UseTime:0.001069s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001710s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000732s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000719s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001378s ]
  6. SELECT * FROM `set` [ RunTime:0.000624s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001570s ]
  8. SELECT * FROM `article` WHERE `id` = 834185 LIMIT 1 [ RunTime:0.003973s ]
  9. UPDATE `article` SET `lasttime` = 1783219721 WHERE `id` = 834185 [ RunTime:0.006593s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000600s ]
  11. SELECT * FROM `article` WHERE `id` < 834185 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001169s ]
  12. SELECT * FROM `article` WHERE `id` > 834185 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001127s ]
  13. SELECT * FROM `article` WHERE `id` < 834185 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012783s ]
  14. SELECT * FROM `article` WHERE `id` < 834185 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011523s ]
  15. SELECT * FROM `article` WHERE `id` < 834185 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.022864s ]
0.195510s