差别
这里会显示出您选择的修订版和当前版本之间的差别。
| 后一修订版 | 前一修订版 | ||
|
温度计 [2017/03/10 16:02] zhijun 创建 |
温度计 [2017/03/13 14:55] (当前版本) zhijun |
||
|---|---|---|---|
| 行 1: | 行 1: | ||
| ======基于小脚丫STEP MXO2的温度显示系统====== | ======基于小脚丫STEP MXO2的温度显示系统====== | ||
| - | =====项目简介===== | + | =====一、项目简介===== |
| 基于小脚丫STEP MXO2的温度显示系统的核心控制模块为小脚丫STEP MXO2开发板，采用由MicroUSB输入的5V供电，温度传感器选用的是DALLAS的经典传感器——DS18B20，一个封装和常见三极管（TO-92）相同的温度传感器，而显示模块采用LCD1602，相信读者对这两个模块一定是极为熟悉。 | 基于小脚丫STEP MXO2的温度显示系统的核心控制模块为小脚丫STEP MXO2开发板，采用由MicroUSB输入的5V供电，温度传感器选用的是DALLAS的经典传感器——DS18B20，一个封装和常见三极管（TO-92）相同的温度传感器，而显示模块采用LCD1602，相信读者对这两个模块一定是极为熟悉。 | ||
| - | =====项目框图===== | + | =====二、项目框图===== |
| + | {{ ::框图.png ?600 |}} | ||
| + | ====1.控制核心==== | ||
| + | 温度计项目控制核心为小脚丫STEP MXO2 V2版本FPGA开发板，FPGA芯片为Lattice Semiconductor的MachXO2 400HC系列FPGA。 | ||
| + | ====2.温度采集模块==== | ||
| + | 温度采集模块采用Dallas的经典产品——DS18B20，是一个高精度，占用空间小，硬件连接简单，价格低廉的数字温度传感器，采用单总线驱动方式，更为节省开发板资源。 | ||
| + | ====3.温度显示系统==== | ||
| + | 温度显示模块采用集成了ASCII字库的LCD1602，省去了自建字库的麻烦。 | ||
| + | |||
| + | =====三、硬件电路图===== | ||
| + | {{ ::电路图.png?800 |}} | ||
| + | 温度计的硬件电路比较简单，首先在供电方面，作为控制核心的小脚丫开发板由于具备完善的下载与供电方案，故不必在设计下载电路，只需要一根MicroUSB数据线即可满足整体系统的供电与下载； | ||
| + | \\ | ||
| + | 在温度采集部分，DS18B20共有三个引脚，我们参照硬件手册，可发现该芯片的1号引脚接地，2号引脚为数据信号DQ，接到小脚丫的任意引脚上（下图接到了小脚丫STEP MXO2的“SI”引脚上），3号引脚为电源脚，参照手册，DS18B20的输入电压为3.0V-5.5V，此处我们采用了3.3V供电。 | ||
| + | \\ | ||
| + | 温度显示部分，LCD1602共有16个引脚，下图为LCD1602的引脚简介，对应连接即可： | ||
| + | {{ ::lcd1602引脚定义.png?400 |}} | ||
| + | |||
| + | =====四、Verilog代码===== | ||
| + | ====1.Verilog代码:LCD1602显示部分==== | ||
| + | ------ | ||
| + | <code verilog> | ||
| + | |||
| + | // -------------------------------------------------------------------- | ||
| + | // >>>>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<< | ||
| + | // -------------------------------------------------------------------- | ||
| + | // Module:LCD1602 | ||
| + | // | ||
| + | // Author: STEP | ||
| + | // | ||
| + | // Description: Display the temperature by LCD1602 | ||
| + | // | ||
| + | // Web: www.stepfpga.com | ||
| + | // | ||
| + | // -------------------------------------------------------------------- | ||
| + | // Code Revision History : | ||
| + | // -------------------------------------------------------------------- | ||
| + | // Version: |Mod. Date: |Changes Made: | ||
| + | // V1.0 |2017.3.8 |Initial ver | ||
| + | // -------------------------------------------------------------------- | ||
| + | |||
| + | module LCD_1602(clk,LCD_EN,RS,RW,DB8,one_wire,rst); | ||
| + | |||
| + | input clk,rst; //系统时钟与复位，系统时钟==12M | ||
| + | output LCD_EN; //LCD_EN为LCD模块的使能信号（下降沿触发） | ||
| + | output RS; //RS=0时为写指令；RS=1时为写数据 | ||
| + | output RW; //RW=0时对LCD模块执行写操作；RW=1时对LCD模块执行读操作 | ||
| + | output [7:0] DB8; //8位指令或数据总线 | ||
| + | inout one_wire; //例化DS18B20模块单总线 | ||
| + | |||
| + | reg RS; | ||
| + | reg LCD_EN_Sel; | ||
| + | reg [7:0] DB8; | ||
| + | reg [127:0] data_row1; | ||
| + | reg [127:0] data_row2; | ||
| + | |||
| + | reg [7:0] result_unit; | ||
| + | reg [7:0] result_decade; | ||
| + | reg [7:0] result_hundred; | ||
| + | reg [7:0] result_dec; | ||
| + | reg [7:0] result_dec2; | ||
| + | reg [7:0] result_dec3; | ||
| + | reg [7:0] result_dec4; | ||
| + | reg [7:0] sign; | ||
| + | |||
| + | reg [3:0] num_unit; | ||
| + | reg [3:0] num_decade; | ||
| + | reg [3:0] num_hundred; | ||
| + | reg [3:0] num_dec; | ||
| + | reg [3:0] num_dec2; | ||
| + | reg [3:0] num_dec3; | ||
| + | reg [3:0] num_dec4; //若想显示小数点第四位，添加至显示内容并调整即可 | ||
| + | |||
| + | reg[19:0] cnt_ref; //LCD1602更新计数器 | ||
| + | reg ref; //更新标志位 | ||
| + | |||
| + | always@(posedge clk_2ms) //产生LCD1602更新所需信号 | ||
| + | begin | ||
| + | if(cnt_ref==220) | ||
| + | begin | ||
| + | cnt_ref<=0; | ||
| + | ref<=1; | ||
| + | ref<=0; | ||
| + | end | ||
| + | else | ||
| + | begin | ||
| + | cnt_ref<=cnt_ref+1; | ||
| + | ref<=1; | ||
| + | end | ||
| + | end | ||
| + | |||
| + | always@(*) //1602输入数据接口处理 | ||
| + | begin | ||
| + | case(num_unit) //个位 | ||
| + | 4'd0:result_unit<=8'b00110000; | ||
| + | 4'd1:result_unit<=8'b00110001; | ||
| + | 4'd2:result_unit<=8'b00110010; | ||
| + | 4'd3:result_unit<=8'b00110011; | ||
| + | 4'd4:result_unit<=8'b00110100; | ||
| + | 4'd5:result_unit<=8'b00110101; | ||
| + | 4'd6:result_unit<=8'b00110110; | ||
| + | 4'd7:result_unit<=8'b00110111; | ||
| + | 4'd8:result_unit<=8'b00111000; | ||
| + | 4'd9:result_unit<=8'b00111001; | ||
| + | default:result_unit<=result_unit; | ||
| + | endcase | ||
| + | |||
| + | case(num_decade) //十位 | ||
| + | 4'd0:result_decade<=8'b00110000; | ||
| + | 4'd1:result_decade<=8'b00110001; | ||
| + | 4'd2:result_decade<=8'b00110010; | ||
| + | 4'd3:result_decade<=8'b00110011; | ||
| + | 4'd4:result_decade<=8'b00110100; | ||
| + | 4'd5:result_decade<=8'b00110101; | ||
| + | 4'd6:result_decade<=8'b00110110; | ||
| + | 4'd7:result_decade<=8'b00110111; | ||
| + | 4'd8:result_decade<=8'b00111000; | ||
| + | 4'd9:result_decade<=8'b00111001; | ||
| + | default:result_decade<=result_decade; | ||
| + | endcase | ||
| + | |||
| + | case(num_hundred) //百位 | ||
| + | 4'd0:result_hundred<=8'b00110000; | ||
| + | 4'd1:result_hundred<=8'b00110001; | ||
| + | 4'd2:result_hundred<=8'b00110010; | ||
| + | 4'd3:result_hundred<=8'b00110011; | ||
| + | 4'd4:result_hundred<=8'b00110100; | ||
| + | 4'd5:result_hundred<=8'b00110101; | ||
| + | 4'd6:result_hundred<=8'b00110110; | ||
| + | 4'd7:result_hundred<=8'b00110111; | ||
| + | 4'd8:result_hundred<=8'b00111000; | ||
| + | 4'd9:result_hundred<=8'b00111001; | ||
| + | default:result_hundred<=result_hundred; | ||
| + | endcase | ||
| + | |||
| + | case(num_dec) //小数位 | ||
| + | 4'd0:result_dec<=8'b00110000; | ||
| + | 4'd1:result_dec<=8'b00110001; | ||
| + | 4'd2:result_dec<=8'b00110010; | ||
| + | 4'd3:result_dec<=8'b00110011; | ||
| + | 4'd4:result_dec<=8'b00110100; | ||
| + | 4'd5:result_dec<=8'b00110101; | ||
| + | 4'd6:result_dec<=8'b00110110; | ||
| + | 4'd7:result_dec<=8'b00110111; | ||
| + | 4'd8:result_dec<=8'b00111000; | ||
| + | 4'd9:result_dec<=8'b00111001; | ||
| + | default:result_dec<=result_dec; | ||
| + | endcase | ||
| + | |||
| + | case(num_dec4) //小数位 | ||
| + | 4'd0:result_dec4<=8'b00110000; | ||
| + | 4'd1:result_dec4<=8'b00110001; | ||
| + | 4'd2:result_dec4<=8'b00110010; | ||
| + | 4'd3:result_dec4<=8'b00110011; | ||
| + | 4'd4:result_dec4<=8'b00110100; | ||
| + | 4'd5:result_dec4<=8'b00110101; | ||
| + | 4'd6:result_dec4<=8'b00110110; | ||
| + | 4'd7:result_dec4<=8'b00110111; | ||
| + | 4'd8:result_dec4<=8'b00111000; | ||
| + | 4'd9:result_dec4<=8'b00111001; | ||
| + | default:result_dec4<=result_dec4; | ||
| + | endcase | ||
| + | |||
| + | case(num_dec2) //小数位 | ||
| + | 4'd0:result_dec2<=8'b00110000; | ||
| + | 4'd1:result_dec2<=8'b00110001; | ||
| + | 4'd2:result_dec2<=8'b00110010; | ||
| + | 4'd3:result_dec2<=8'b00110011; | ||
| + | 4'd4:result_dec2<=8'b00110100; | ||
| + | 4'd5:result_dec2<=8'b00110101; | ||
| + | 4'd6:result_dec2<=8'b00110110; | ||
| + | 4'd7:result_dec2<=8'b00110111; | ||
| + | 4'd8:result_dec2<=8'b00111000; | ||
| + | 4'd9:result_dec2<=8'b00111001; | ||
| + | default:result_dec2<=result_dec2; | ||
| + | endcase | ||
| + | |||
| + | case(num_dec3) //小数位 | ||
| + | 4'd0:result_dec3<=8'b00110000; | ||
| + | 4'd1:result_dec3<=8'b00110001; | ||
| + | 4'd2:result_dec3<=8'b00110010; | ||
| + | 4'd3:result_dec3<=8'b00110011; | ||
| + | 4'd4:result_dec3<=8'b00110100; | ||
| + | 4'd5:result_dec3<=8'b00110101; | ||
| + | 4'd6:result_dec3<=8'b00110110; | ||
| + | 4'd7:result_dec3<=8'b00110111; | ||
| + | 4'd8:result_dec3<=8'b00111000; | ||
| + | 4'd9:result_dec3<=8'b00111001; | ||
| + | default:result_dec3<=result_dec3; | ||
| + | endcase | ||
| + | end | ||
| + | |||
| + | |||
| + | //-------------------------------------// | ||
| + | //输入时钟12MHz 输出周期2ms | ||
| + | //division12MHz_2ms.v | ||
| + | reg [15:0]count; | ||
| + | reg clk_2ms; | ||
| + | always @ (posedge clk) | ||
| + | begin | ||
| + | if(count == 16'd12_000) | ||
| + | begin | ||
| + | count <= 16'b1; | ||
| + | clk_2ms <= ~clk_2ms; | ||
| + | end | ||
| + | else | ||
| + | count <= count + 1'b1; | ||
| + | end | ||
| + | //---------------------------------------// | ||
| + | |||
| + | reg [127:0] Data_Buf; //液晶显示的数据缓存 | ||
| + | reg [4:0] disp_count; | ||
| + | reg [3:0] state; //状态机 | ||
| + | |||
| + | parameter Clear_Lcd = 4'b0000; //清屏并光标复位 | ||
| + | parameter Set_Disp_Mode = 4'b0001; //设置显示模式：8位2行5x7点阵 | ||
| + | parameter Disp_On = 4'b0010; //显示器开、光标不显示、光标不允许闪烁 | ||
| + | parameter Shift_Down = 4'b0011; //文字不动，光标自动右移 | ||
| + | parameter Write_Addr = 4'b0100; //写入显示起始地址 | ||
| + | parameter Write_Data_First = 4'b0101; //写入第一行显示的数据 | ||
| + | parameter Write_Data_Second = 4'b0110; //写入第二行显示的数据 | ||
| + | assign RW = 1'b0; //RW=0时对LCD模块执行写操作(一直保持写状态） | ||
| + | assign LCD_EN = LCD_EN_Sel ? clk_2ms : 1'b0; //通过LCD_EN_Sel信号来控制LCD_EN的开启与关闭 | ||
| + | |||
| + | |||
| + | //--------------------------------显示模块----------------------------// | ||
| + | always @(posedge clk_2ms or negedge rst or negedge ref) | ||
| + | begin | ||
| + | //-----------------------复位并更新显示数据--------------------// | ||
| + | |||
| + | if(!rst || !ref) | ||
| + | begin | ||
| + | state <= Clear_Lcd; //复位：清屏并光标复位 | ||
| + | RS <= 1'b1; //复位：RS=1时为读指令； | ||
| + | DB8 <= 8'b0; //复位：使DB8总线输出全0 | ||
| + | LCD_EN_Sel <= 1'b0; //复位：关夜晶使能信号 | ||
| + | disp_count <= 5'b0; | ||
| + | data_row1 <= { //输入第一行要显示的数据 | ||
| + | 8'b01010011, //S | ||
| + | 8'b01010100, //T | ||
| + | 8'b01000101, //E | ||
| + | 8'b01010000, //P | ||
| + | 8'b00100000, //SPACE | ||
| + | 8'b01000110, //F | ||
| + | 8'b01010000, //P | ||
| + | 8'b01000111, //G | ||
| + | 8'b01000001, //A | ||
| + | 8'b00100000, //SPACE | ||
| + | 8'b00100000, //SPACE | ||
| + | 8'b00100000, //SPACE | ||
| + | 8'b00100000, //SPACE | ||
| + | 8'b00100000, //SPACE | ||
| + | 8'b00100000, //SPACE | ||
| + | 8'b00100000 //SPACE | ||
| + | }; | ||
| + | data_row2 <= { 8'b00100000, //输入第二行要显示的数据 | ||
| + | 8'b00100000, //SPACE | ||
| + | 8'b01010100, //T | ||
| + | 8'b01100101, //e | ||
| + | 8'b01101101, //m | ||
| + | 8'b00111010, //冒号 | ||
| + | sign, | ||
| + | result_unit, | ||
| + | result_decade, | ||
| + | result_hundred, | ||
| + | 8'b00101110, //. | ||
| + | result_dec, | ||
| + | result_dec2, | ||
| + | result_dec3, | ||
| + | 8'hdf, //℃ | ||
| + | 8'b01000011 | ||
| + | |||
| + | }; | ||
| + | end | ||
| + | else | ||
| + | begin | ||
| + | case(state) | ||
| + | //-------------------------------初始化LCD------------------------------------// | ||
| + | |||
| + | Clear_Lcd : begin LCD_EN_Sel <= 1'b1; //开使能 | ||
| + | RS <= 1'b0; //写指令 | ||
| + | DB8 <= 8'b00000001; //清屏并光标复位 | ||
| + | state <= Set_Disp_Mode; end | ||
| + | Set_Disp_Mode : begin DB8 <= 8'b00111000; //设置显示模式：8位2行5x8点阵 | ||
| + | state <= Disp_On; end | ||
| + | Disp_On : begin DB8 <= 8'b00001100; //显示器开、光标不显示、光标不允许闪烁 | ||
| + | state <= Shift_Down; end | ||
| + | Shift_Down : begin DB8 <= 8'b00000110; //文字不动，光标自动右移 | ||
| + | state <= Write_Addr; end | ||
| + | | ||
| + | //---------------------------------显示循环------------------------------------// | ||
| + | |||
| + | Write_Addr : begin RS <= 1'b0; //写指令 | ||
| + | DB8 <= 8'b10000000; //写入第一行显示起始地址：第一行第1个位置 | ||
| + | Data_Buf <= data_row1; //将第一行显示的数据赋给Data_First_Buf | ||
| + | state <= Write_Data_First; end | ||
| + | Write_Data_First : begin //写第一行数据 | ||
| + | if(disp_count == 16) //disp_count等于15时表示第一行数据已写完 | ||
| + | begin | ||
| + | RS <= 1'b0; //写指令 | ||
| + | DB8 <= 8'b11000000; //送入写第二行的指令,第2行第1个位置 | ||
| + | disp_count <= 5'b0; //计数清0 | ||
| + | Data_Buf <= data_row2; //将第2行显示的数据赋给Data_First_Buf | ||
| + | state <= Write_Data_Second;end //写完第一行进入写第二行状态 | ||
| + | else //没写够16字节 | ||
| + | begin | ||
| + | RS <= 1'b1; //RS=1表示写数据 | ||
| + | DB8 <= Data_Buf[127:120]; | ||
| + | Data_Buf <= (Data_Buf << 8); | ||
| + | disp_count <= disp_count + 1'b1; | ||
| + | state <= Write_Data_First; end end | ||
| + | Write_Data_Second : begin //写第二行数据 | ||
| + | if(disp_count == 16)//数据发送完毕 | ||
| + | begin | ||
| + | RS <= 1'b0; //写指令 | ||
| + | DB8 <= 8'b10000000; //写入第一行显示起始地址：第一行第1个位置 | ||
| + | disp_count <= 5'b0; | ||
| + | state <= Write_Addr; //重新循环 | ||
| + | end | ||
| + | else | ||
| + | begin | ||
| + | RS <= 1'b1; | ||
| + | DB8 <= Data_Buf[127:120]; | ||
| + | Data_Buf <= (Data_Buf << 8); | ||
| + | disp_count <= disp_count + 1'b1; | ||
| + | state <= Write_Data_Second; | ||
| + | end end | ||
| + | //--------------------------------------------------------------------------// | ||
| + | default : state <= Clear_Lcd; //若state为其他值，则将state置为Clear_Lcd | ||
| + | endcase | ||
| + | end | ||
| + | end | ||
| + | |||
| + | //--------------------------------------------------------------------------// | ||
| + | |||
| + | |||
| + | |||
| + | wire clk_in; | ||
| + | wire rst_n_in; | ||
| + | wire [15:0] data_out; | ||
| + | wire tem_flag=data_out[15:11]?1'b0:1'b1; | ||
| + | wire [10:0] tem_code=tem_flag?data_out[10:0]:(~data_out[10:0])+1'b1; | ||
| + | wire [20:0] tem_data=tem_code*625; | ||
| + | reg [27:0] bcd_code; | ||
| + | DS18B20Z DS18B20Z_uut | ||
| + | ( | ||
| + | .one_wire(one_wire), | ||
| + | .clk_in(clk), | ||
| + | .rst_n_in(rst), | ||
| + | .data_out(data_out) | ||
| + | ); | ||
| + | |||
| + | |||
| + | |||
| + | reg [48:0] shift_reg; | ||
| + | always@(posedge clk or negedge rst)begin | ||
| + | |||
| + | shift_reg= {28'h0,tem_data}; | ||
| + | |||
| + | if(!rst) bcd_code = 0; | ||
| + | else | ||
| + | begin | ||
| + | repeat(21)//repeat B_SIZE times | ||
| + | begin | ||
| + | if (shift_reg[24:21] >= 5) shift_reg[24:21] = shift_reg[24:21] + 2'b11; | ||
| + | if (shift_reg[28:25] >= 5) shift_reg[28:25] = shift_reg[28:25] + 2'b11; | ||
| + | if (shift_reg[32:29] >= 5) shift_reg[32:29] = shift_reg[32:29] + 2'b11; | ||
| + | if (shift_reg[36:33] >= 5) shift_reg[36:33] = shift_reg[36:33] + 2'b11; | ||
| + | if (shift_reg[40:37] >= 5) shift_reg[40:37] = shift_reg[40:37] + 2'b11; | ||
| + | if (shift_reg[44:41] >= 5) shift_reg[44:41] = shift_reg[44:41] + 2'b11; | ||
| + | if (shift_reg[48:45] >= 5) shift_reg[48:45] = shift_reg[48:45] + 2'b11; | ||
| + | if (tem_flag==0) sign<=8'b00101101; | ||
| + | if (tem_flag==1) sign<=8'b00100000; | ||
| + | shift_reg = shift_reg << 1; | ||
| + | end | ||
| + | bcd_code=shift_reg[48:21]; | ||
| + | |||
| + | num_unit <= bcd_code[27:24]; | ||
| + | num_decade <= bcd_code[23:20]; | ||
| + | num_hundred<= bcd_code[19:16]; | ||
| + | num_dec <= bcd_code[15:12]; | ||
| + | num_dec2 <= bcd_code[11:8]; | ||
| + | num_dec3 <= bcd_code[7:4]; | ||
| + | num_dec4 <= bcd_code[3:0]; | ||
| + | |||
| + | |||
| + | end | ||
| + | end | ||
| + | |||
| + | |||
| + | endmodule | ||
| + | |||
| + | |||
| + | |||
| + | |||
| + | </code> | ||
| + | |||
| + | |||
| + | |||
| + | |||
| + | |||
| + | ====2.温度采集部分==== | ||
| + | ------ | ||
| + | <code verilog> | ||
| + | // -------------------------------------------------------------------- | ||
| + | // >>>>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<< | ||
| + | // -------------------------------------------------------------------- | ||
| + | // Module:DS18B20Z | ||
| + | // | ||
| + | // Author: Step | ||
| + | // | ||
| + | // Description: Drive DS18B20Z to get temperature code | ||
| + | // | ||
| + | // Web: www.stepfpga.com | ||
| + | // | ||
| + | // -------------------------------------------------------------------- | ||
| + | // Code Revision History : | ||
| + | // -------------------------------------------------------------------- | ||
| + | // Version: |Mod. Date: |Changes Made: | ||
| + | // V1.0 |2015/11/11 |Initial ver | ||
| + | // -------------------------------------------------------------------- | ||
| + | module DS18B20Z | ||
| + | ( | ||
| + | input clk_in, // system clock | ||
| + | input rst_n_in, // system reset, active low | ||
| + | inout one_wire, // ds18b20z one-wire-bus | ||
| + | output reg [15:0] data_out // ds18b20z data_out | ||
| + | ); | ||
| + | |||
| + | |||
| + | |||
| + | |||
| + | localparam IDLE = 3'd0; | ||
| + | localparam MAIN = 3'd1; | ||
| + | localparam INIT = 3'd2; | ||
| + | localparam WRITE = 3'd3; | ||
| + | localparam READ = 3'd4; | ||
| + | localparam DELAY = 3'd5; | ||
| + | |||
| + | //generate clk_1mhz clock | ||
| + | reg clk_1mhz; | ||
| + | reg [2:0] cnt_1mhz; | ||
| + | always@(posedge clk_in or negedge rst_n_in) begin | ||
| + | if(!rst_n_in) begin | ||
| + | cnt_1mhz <= 3'd0; | ||
| + | clk_1mhz <= 1'b0; | ||
| + | end else if(cnt_1mhz >= 3'd5) begin | ||
| + | cnt_1mhz <= 3'd0; | ||
| + | clk_1mhz <= ~clk_1mhz; | ||
| + | end else begin | ||
| + | cnt_1mhz <= cnt_1mhz + 1'b1; | ||
| + | end | ||
| + | end | ||
| + | |||
| + | reg one_wire_buffer; | ||
| + | reg [3:0] cnt_main; | ||
| + | reg [7:0] data_wr; | ||
| + | reg [7:0] data_wr_buffer; | ||
| + | reg [2:0] cnt_init; | ||
| + | reg [19:0] cnt_delay; | ||
| + | reg [19:0] num_delay; | ||
| + | reg [5:0] cnt_write; | ||
| + | reg [5:0] cnt_read; | ||
| + | reg [15:0] temperature; | ||
| + | reg [7:0] temperature_buffer; | ||
| + | reg [2:0] state = IDLE; | ||
| + | reg [2:0] state_back = IDLE; | ||
| + | always@(posedge clk_1mhz or negedge rst_n_in) begin | ||
| + | if(!rst_n_in) begin | ||
| + | state <= IDLE; | ||
| + | state_back <= IDLE; | ||
| + | cnt_main <= 4'd0; | ||
| + | cnt_init <= 3'd0; | ||
| + | cnt_write <= 6'd0; | ||
| + | cnt_read <= 6'd0; | ||
| + | cnt_delay <= 20'd0; | ||
| + | one_wire_buffer <= 1'bz; | ||
| + | temperature <= 16'h0; | ||
| + | end else begin | ||
| + | case(state) | ||
| + | IDLE:begin | ||
| + | state <= MAIN; | ||
| + | state_back <= MAIN; | ||
| + | cnt_main <= 4'd0; | ||
| + | cnt_init <= 3'd0; | ||
| + | cnt_write <= 6'd0; | ||
| + | cnt_read <= 6'd0; | ||
| + | cnt_delay <= 20'd0; | ||
| + | one_wire_buffer <= 1'bz; | ||
| + | end | ||
| + | MAIN:begin | ||
| + | if(cnt_main >= 4'd11) cnt_main <= 1'b0; | ||
| + | else cnt_main <= cnt_main + 1'b1; | ||
| + | case(cnt_main) | ||
| + | 4'd0: begin state <= INIT; end | ||
| + | 4'd1: begin data_wr <= 8'hcc;state <= WRITE; end | ||
| + | 4'd2: begin data_wr <= 8'h44;state <= WRITE; end | ||
| + | 4'd3: begin num_delay <= 20'd750000;state <= DELAY;state_back <= MAIN; end | ||
| + | |||
| + | 4'd4: begin state <= INIT; end | ||
| + | 4'd5: begin data_wr <= 8'hcc;state <= WRITE; end | ||
| + | 4'd6: begin data_wr <= 8'hbe;state <= WRITE; end | ||
| + | |||
| + | 4'd7: begin state <= READ; end | ||
| + | 4'd8: begin temperature[7:0] <= temperature_buffer; end | ||
| + | |||
| + | 4'd9: begin state <= READ; end | ||
| + | 4'd10: begin temperature[15:8] <= temperature_buffer; end | ||
| + | |||
| + | 4'd11: begin state <= IDLE;data_out <= temperature; end | ||
| + | default: state <= IDLE; | ||
| + | endcase | ||
| + | end | ||
| + | INIT:begin | ||
| + | if(cnt_init >= 3'd6) cnt_init <= 1'b0; | ||
| + | else cnt_init <= cnt_init + 1'b1; | ||
| + | case(cnt_init) | ||
| + | 3'd0: begin one_wire_buffer <= 1'b0; end | ||
| + | 3'd1: begin num_delay <= 20'd500;state <= DELAY;state_back <= INIT; end | ||
| + | 3'd2: begin one_wire_buffer <= 1'bz; end | ||
| + | 3'd3: begin num_delay <= 20'd100;state <= DELAY;state_back <= INIT; end | ||
| + | 3'd4: begin if(one_wire) state <= IDLE; else state <= INIT; end | ||
| + | 3'd5: begin num_delay <= 20'd400;state <= DELAY;state_back <= INIT; end | ||
| + | 3'd6: begin state <= MAIN; end | ||
| + | default: state <= IDLE; | ||
| + | endcase | ||
| + | end | ||
| + | WRITE:begin | ||
| + | if(cnt_write >= 6'd50) cnt_write <= 1'b0; | ||
| + | else cnt_write <= cnt_write + 1'b1; | ||
| + | case(cnt_write) | ||
| + | //lock data_wr | ||
| + | 6'd0: begin data_wr_buffer <= data_wr; end | ||
| + | //write bit 0 | ||
| + | 6'd1: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd2: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd3: begin one_wire_buffer <= data_wr_buffer[0]; end | ||
| + | 6'd4: begin num_delay <= 20'd80;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd5: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd6: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | //write bit 1 | ||
| + | 6'd7: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd8: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd9: begin one_wire_buffer <= data_wr_buffer[1]; end | ||
| + | 6'd10: begin num_delay <= 20'd80;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd11: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd12: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | //write bit 2 | ||
| + | 6'd13: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd14: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd15: begin one_wire_buffer <= data_wr_buffer[2]; end | ||
| + | 6'd16: begin num_delay <= 20'd80;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd17: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd18: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | //write bit 3 | ||
| + | 6'd19: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd20: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd21: begin one_wire_buffer <= data_wr_buffer[3]; end | ||
| + | 6'd22: begin num_delay <= 20'd80;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd23: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd24: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | //write bit 4 | ||
| + | 6'd25: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd26: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd27: begin one_wire_buffer <= data_wr_buffer[4]; end | ||
| + | 6'd28: begin num_delay <= 20'd80;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd29: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd30: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | //write bit 5 | ||
| + | 6'd31: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd32: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd33: begin one_wire_buffer <= data_wr_buffer[5]; end | ||
| + | 6'd34: begin num_delay <= 20'd80;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd35: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd36: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | //write bit 6 | ||
| + | 6'd37: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd38: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd39: begin one_wire_buffer <= data_wr_buffer[6]; end | ||
| + | 6'd40: begin num_delay <= 20'd80;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd41: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd42: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | //write bit 7 | ||
| + | 6'd43: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd44: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd45: begin one_wire_buffer <= data_wr_buffer[7]; end | ||
| + | 6'd46: begin num_delay <= 20'd80;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd47: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd48: begin num_delay <= 20'd2;state <= DELAY;state_back <= WRITE; end | ||
| + | //back to main | ||
| + | 6'd49: begin num_delay <= 20'd80;state <= DELAY;state_back <= WRITE; end | ||
| + | 6'd50: begin state <= MAIN; end | ||
| + | default: state <= IDLE; | ||
| + | endcase | ||
| + | end | ||
| + | READ:begin | ||
| + | if(cnt_read >= 6'd48) cnt_read <= 1'b0; | ||
| + | else cnt_read <= cnt_read + 1'b1; | ||
| + | case(cnt_read) | ||
| + | //read bit 0 | ||
| + | 6'd0: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd1: begin num_delay <= 20'd2;state <= DELAY;state_back <= READ; end | ||
| + | 6'd2: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd3: begin num_delay <= 20'd10;state <= DELAY;state_back <= READ; end | ||
| + | 6'd4: begin temperature_buffer[0] <= one_wire; end | ||
| + | 6'd5: begin num_delay <= 20'd55;state <= DELAY;state_back <= READ; end | ||
| + | //read bit 1 | ||
| + | 6'd6: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd7: begin num_delay <= 20'd2;state <= DELAY;state_back <= READ; end | ||
| + | 6'd8: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd9: begin num_delay <= 20'd10;state <= DELAY;state_back <= READ; end | ||
| + | 6'd10: begin temperature_buffer[1] <= one_wire; end | ||
| + | 6'd11: begin num_delay <= 20'd55;state <= DELAY;state_back <= READ; end | ||
| + | //read bit 2 | ||
| + | 6'd12: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd13: begin num_delay <= 20'd2;state <= DELAY;state_back <= READ; end | ||
| + | 6'd14: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd15: begin num_delay <= 20'd10;state <= DELAY;state_back <= READ; end | ||
| + | 6'd16: begin temperature_buffer[2] <= one_wire; end | ||
| + | 6'd17: begin num_delay <= 20'd55;state <= DELAY;state_back <= READ; end | ||
| + | //read bit 3 | ||
| + | 6'd18: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd19: begin num_delay <= 20'd2;state <= DELAY;state_back <= READ; end | ||
| + | 6'd20: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd21: begin num_delay <= 20'd10;state <= DELAY;state_back <= READ; end | ||
| + | 6'd22: begin temperature_buffer[3] <= one_wire; end | ||
| + | 6'd23: begin num_delay <= 20'd55;state <= DELAY;state_back <= READ; end | ||
| + | //read bit 4 | ||
| + | 6'd24: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd25: begin num_delay <= 20'd2;state <= DELAY;state_back <= READ; end | ||
| + | 6'd26: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd27: begin num_delay <= 20'd10;state <= DELAY;state_back <= READ; end | ||
| + | 6'd28: begin temperature_buffer[4] <= one_wire; end | ||
| + | 6'd29: begin num_delay <= 20'd55;state <= DELAY;state_back <= READ; end | ||
| + | //read bit 5 | ||
| + | 6'd30: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd31: begin num_delay <= 20'd2;state <= DELAY;state_back <= READ; end | ||
| + | 6'd32: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd33: begin num_delay <= 20'd10;state <= DELAY;state_back <= READ; end | ||
| + | 6'd34: begin temperature_buffer[5] <= one_wire; end | ||
| + | 6'd35: begin num_delay <= 20'd55;state <= DELAY;state_back <= READ; end | ||
| + | //read bit 6 | ||
| + | 6'd36: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd37: begin num_delay <= 20'd2;state <= DELAY;state_back <= READ; end | ||
| + | 6'd38: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd39: begin num_delay <= 20'd10;state <= DELAY;state_back <= READ; end | ||
| + | 6'd40: begin temperature_buffer[6] <= one_wire; end | ||
| + | 6'd41: begin num_delay <= 20'd55;state <= DELAY;state_back <= READ; end | ||
| + | //read bit 7 | ||
| + | 6'd42: begin one_wire_buffer <= 1'b0; end | ||
| + | 6'd43: begin num_delay <= 20'd2;state <= DELAY;state_back <= READ; end | ||
| + | 6'd44: begin one_wire_buffer <= 1'bz; end | ||
| + | 6'd45: begin num_delay <= 20'd10;state <= DELAY;state_back <= READ; end | ||
| + | 6'd46: begin temperature_buffer[7] <= one_wire; end | ||
| + | 6'd47: begin num_delay <= 20'd55;state <= DELAY;state_back <= READ; end | ||
| + | //back to main | ||
| + | 6'd48: begin state <= MAIN; end | ||
| + | default: state <= IDLE; | ||
| + | endcase | ||
| + | end | ||
| + | DELAY:begin | ||
| + | if(cnt_delay >= num_delay) begin | ||
| + | cnt_delay <= 1'b0; | ||
| + | state <= state_back; | ||
| + | end else cnt_delay <= cnt_delay + 1'b1; | ||
| + | end | ||
| + | endcase | ||
| + | end | ||
| + | end | ||
| + | |||
| + | assign one_wire = one_wire_buffer; | ||
| + | |||
| + | endmodule | ||
| + | |||
| + | </code> | ||