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