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温度计 [2017/03/13 14:52]
zhijun
温度计 [2017/03/13 14:54]
zhijun
行 401: 行 401:
  
  
 +
 +
 +
 +====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>​