HC595.v
/**https://docs.wokwi.com/zh-CN/parts/wokwi-74hc595
**/
`timescale 1ns / 1ps
module HC595 (input wire i_clk, // 全局时钟，用于同步操作input wire i_rst_n, // 复位信号，清除所有寄存器input wire DS, // 串行数据输入（DS）input wire SHCP, // 移位时钟（SHCP），用于移位操作input wire STCP, // 存储时钟（STCP），用于锁存数据output reg [7:0] Q, // 8 位并行输出（Q）output reg Q7S // 串行输出（从移位寄存器）
);reg [7:0] r_shift_reg; // 8 位移位寄存器// 移位操作：每当 SHCP 上升沿时，将串行数据输入到移位寄存器always @(posedge SHCP or posedge i_rst_n) beginif (!i_rst_n) beginr_shift_reg <= 8'b0; // 复位时清零移位寄存器end else beginr_shift_reg <= {r_shift_reg[6:0], DS}; // 左移并输入串行数据endend// 存储操作：每当 STCP 上升沿时，将移位寄存器的内容传递到并行输出寄存器always @(posedge STCP or posedge i_rst_n) beginif (!i_rst_n) beginQ <= 8'b0; // 复位时清空并行输出end else beginQ <= r_shift_reg; // 将移位寄存器的内容输出到并行输出endend// 串行输出：移位寄存器的最右边位（r_shift_reg[7]）作为串行输出always @(posedge i_clk) beginQ7S <= r_shift_reg[7]; // 串行输出为移位寄存器的最右边位endendmodule
hc595_drive.v
`timescale 1ns / 1psmodule hc595_drive (input wire i_clk, // 全局时钟input wire i_rst_n, // 低电平复位input wire i_start, // 启动信号input wire [7:0] i_data, // 8 位数据输入output reg o_shcp, // 移位时钟output reg o_stcp, // 存储时钟output reg o_ds, // 串行数据输出output reg o_done // 传输完成信号
);// 状态编码localparam S_IDLE = 3'd0,S_LOAD = 3'd1,S_SHIFT_LOW = 3'd2,S_SHIFT_HIGH = 3'd3,S_LATCH_LOW = 3'd4,S_LATCH_HIGH = 3'd5,S_DONE = 3'd6;reg [2:0] state;reg [3:0] r_bit_cnt;reg [7:0] r_shift_reg;always @(posedge i_clk or negedge i_rst_n) beginif (!i_rst_n) begino_shcp <= 1'b0;o_stcp <= 1'b0;o_ds <= 1'b0;o_done <= 1'b0;r_bit_cnt <= 4'd0;r_shift_reg <= 8'd0;state <= S_IDLE;end else begincase (state)S_IDLE: begino_done <= 1'b0;o_shcp <= 1'b0;o_stcp <= 1'b0;if (i_start) beginstate <= S_LOAD;endendS_LOAD: beginr_shift_reg <= i_data;r_bit_cnt <= 4'd0;state <= S_SHIFT_LOW;endS_SHIFT_LOW: begino_ds <= r_shift_reg[7];o_shcp <= 1'b0;state <= S_SHIFT_HIGH;endS_SHIFT_HIGH: begino_shcp <= 1'b1;r_shift_reg <= {r_shift_reg[6:0], 1'b0}; // 左移r_bit_cnt <= r_bit_cnt + 1;if (r_bit_cnt == 4'd7)state <= S_LATCH_LOW;elsestate <= S_SHIFT_LOW;endS_LATCH_LOW: begino_stcp <= 1'b0;state <= S_LATCH_HIGH;endS_LATCH_HIGH: begino_stcp <= 1'b1;state <= S_DONE;endS_DONE: begino_stcp <= 1'b0;o_shcp <= 1'b0;o_done <= 1'b1;state <= S_IDLE;endendcaseendendendmodule
tb.v
`timescale 1ns / 1psmodule tb;reg clk;reg rst_n;reg start;reg [7:0] dat;wire SHCP;wire STCP;wire DS;wire done;wire [7:0] Q;wire Q7S;// 实例化 HC595HC595 u_hc595 (.i_clk(clk),.i_rst_n(rst_n),.DS(DS),.SHCP(SHCP),.STCP(STCP),.Q(Q),.Q7S(Q7S));// 实例化驱动模块hc595_drive u_hc595_drive (.i_clk(clk),.i_rst_n(rst_n),.i_start(start),.i_data(dat),.o_shcp(SHCP),.o_stcp(STCP),.o_ds(DS),.o_done(done));// 生成时钟initial clk = 0;always #5 clk = ~clk; // 100MHzinitial begin// 初始化rst_n = 0;start = 0;dat = 8'h00;#20;rst_n = 1;#20;// 写入 0x38dat = 8'h38;start = 1;#10;start = 0;// 等待传输完成wait(done == 1);#10;$display("Q_OUT after 0x38 = %b", Q);// 写入 0x46dat = 8'h46;start = 1;#10;start = 0;wait(done == 1);#10;$display("Q_OUT after 0x46 = %b", Q);#50;$finish;endendmodule
wokwi
main.ino
#include <Arduino.h>
#define datapin 2
#define clockpin 3
#define latchpin 4
#define HC595_SCLK(x) digitalWrite(clockpin, x)
#define HC595_RCLK(x) digitalWrite(latchpin, x)
#define HC595_SDAT(x) digitalWrite(datapin, x)
void hc595_drive(unsigned char dat_h)
{unsigned char i;unsigned char dat_temp;HC595_SCLK(0);HC595_RCLK(0);dat_temp = dat_h;for (i = 0; i<8; i++){HC595_SDAT(dat_temp >= 0x80);HC595_SCLK(0);delay(1);HC595_SCLK(1);delay(1);dat_temp = dat_temp << 1;}HC595_RCLK(0);delay(1);HC595_RCLK(1);delay(1);HC595_SCLK(0);HC595_RCLK(0);HC595_SDAT(0);
}
void hc595_init()
{pinMode(datapin, OUTPUT);pinMode(clockpin, OUTPUT);pinMode(latchpin, OUTPUT);
}void setup()
{hc595_init();hc595_drive(0x01);
}void loop()
{}
diagram.json
{"version": 1,"author": "Uri Shaked","editor": "wokwi","parts": [{ "type": "wokwi-arduino-uno", "id": "uno", "top": 231, "left": -135, "attrs": {} },{"type": "wokwi-74hc595","id": "sr1","top": 94.66,"left": 178.9,"rotate": 270,"attrs": {}},{"type": "wokwi-led-bar-graph","id": "bargraph1","top": 72,"left": 321.6,"attrs": { "color": "lime" }},{ "type": "wokwi-gnd", "id": "gnd1", "top": 182.4, "left": 345, "attrs": {} }],"connections": [[ "sr1:DS", "uno:2", "blue", [ "h-75.6", "h0", "v115.2" ] ],[ "sr1:STCP", "uno:4", "purple", [ "h-56.4", "v0", "h-61.5" ] ],[ "sr1:SHCP", "uno:3", "gray", [ "h-75.6", "v0", "h-32.8" ] ],[ "sr1:Q0", "bargraph1:A1", "green", [ "h-18", "v28.8", "h67.2", "v-86.4" ] ],[ "sr1:Q1", "bargraph1:A2", "green", [ "h38.4", "v-57.6" ] ],[ "sr1:Q2", "bargraph1:A3", "green", [ "h28.8", "v-38.4" ] ],[ "sr1:Q3", "bargraph1:A4", "green", [ "h9.6", "v-19.2" ] ],[ "sr1:Q4", "bargraph1:A5", "green", [ "h0" ] ],[ "sr1:Q5", "bargraph1:A6", "green", [ "h9.6", "v-48", "h67.2", "v67.2" ] ],[ "sr1:Q6", "bargraph1:A7", "green", [ "h57.6", "v48" ] ],[ "sr1:Q7", "bargraph1:A8", "green", [ "h48", "v57.6" ] ],[ "bargraph1:C1", "bargraph1:C2", "green", [ "v0" ] ],[ "bargraph1:C3", "bargraph1:C4", "green", [ "h0" ] ],[ "bargraph1:C5", "bargraph1:C6", "green", [ "h0" ] ],[ "bargraph1:C7", "bargraph1:C8", "green", [ "h0" ] ],[ "bargraph1:C9", "bargraph1:C10", "green", [ "h0" ] ],[ "bargraph1:C8", "bargraph1:C9", "green", [ "h0" ] ],[ "bargraph1:C2", "bargraph1:C3", "green", [ "h0" ] ],[ "bargraph1:C4", "bargraph1:C5", "green", [ "h0" ] ],[ "bargraph1:C6", "bargraph1:C7", "green", [ "h0" ] ],[ "gnd1:GND", "bargraph1:C10", "black", [ "v0" ] ]],"dependencies": {}
}
hc595_drive.c
void hc595_drive(unsigned char dat_h)
{unsigned char i;unsigned char dat_temp;HC595_SCLK = 0;HC595_RCLK = 0;dat_temp = dat_h;for (i = 0; i<8; i++){if (dat_temp >= 0x80)HC595_SDAT = 1;else HC595_SDAT = 0;HC595_SCLK = 0;_delay(1);HC595_SCLK = 1;_delay(1);dat_temp = dat_temp << 1;}HC595_RCLK = 0;_delay(1);HC595_RCLK = 1;_delay(1);HC595_SCLK = 0;HC595_RCLK = 0;HC595_SDAT = 0;
}
arduino
#include <Arduino.h>int datapin = 2;
int clockpin = 3;
int latchpin = 4;
#define HC595_SCLK(x) digitalWrite(3, x)
#define HC595_RCLK(x) digitalWrite(4, x)
#define HC595_SDAT(x) digitalWrite(2, x)
void hc595_drive(unsigned char dat_h)
{unsigned char i;unsigned char dat_temp;HC595_SCLK(0);HC595_RCLK(0);dat_temp = dat_h;for (i = 0; i<8; i++){HC595_SDAT(dat_temp >= 0x80);HC595_SCLK(0);delay(1);HC595_SCLK(1);delay(1);dat_temp = dat_temp << 1;}HC595_RCLK(0);delay(1);HC595_RCLK(1);delay(1);HC595_SCLK(0);HC595_RCLK(0);HC595_SDAT(0);
}void setup()
{pinMode(datapin, OUTPUT);pinMode(clockpin, OUTPUT); pinMode(latchpin, OUTPUT);hc595_drive(0x01);
}void loop()
{}
diagram.json
{"version": 1,"author": "Uri Shaked","editor": "wokwi","parts": [{ "type": "wokwi-arduino-uno", "id": "uno", "top": 231, "left": -135, "attrs": {} },{"type": "wokwi-74hc595","id": "sr1","top": 94.66,"left": 178.9,"rotate": 270,"attrs": {}},{"type": "wokwi-led-bar-graph","id": "bargraph1","top": 72,"left": 321.6,"attrs": { "color": "lime" }},{ "type": "wokwi-gnd", "id": "gnd1", "top": 182.4, "left": 345, "attrs": {} }],"connections": [[ "sr1:DS", "uno:2", "blue", [ "h-75.6", "h0", "v115.2" ] ],[ "sr1:STCP", "uno:4", "purple", [ "h-56.4", "v0", "h-61.5" ] ],[ "sr1:SHCP", "uno:3", "gray", [ "h4", "v30", "h-66" ] ],[ "sr1:Q0", "bargraph1:A1", "green", [ "h-18", "v28.8", "h67.2", "v-86.4" ] ],[ "sr1:Q1", "bargraph1:A2", "green", [ "h38.4", "v-57.6" ] ],[ "sr1:Q2", "bargraph1:A3", "green", [ "h28.8", "v-38.4" ] ],[ "sr1:Q3", "bargraph1:A4", "green", [ "h9.6", "v-19.2" ] ],[ "sr1:Q4", "bargraph1:A5", "green", [ "h0" ] ],[ "sr1:Q5", "bargraph1:A6", "green", [ "h9.6", "v-48", "h67.2", "v67.2" ] ],[ "sr1:Q6", "bargraph1:A7", "green", [ "h57.6", "v48" ] ],[ "sr1:Q7", "bargraph1:A8", "green", [ "h48", "v57.6" ] ],[ "bargraph1:C1", "bargraph1:C2", "green", [ "v0" ] ],[ "bargraph1:C3", "bargraph1:C4", "green", [ "h0" ] ],[ "bargraph1:C5", "bargraph1:C6", "green", [ "h0" ] ],[ "bargraph1:C7", "bargraph1:C8", "green", [ "h0" ] ],[ "bargraph1:C9", "bargraph1:C10", "green", [ "h0" ] ],[ "bargraph1:C8", "bargraph1:C9", "green", [ "h0" ] ],[ "bargraph1:C2", "bargraph1:C3", "green", [ "h0" ] ],[ "bargraph1:C4", "bargraph1:C5", "green", [ "h0" ] ],[ "bargraph1:C6", "bargraph1:C7", "green", [ "h0" ] ],[ "gnd1:GND", "bargraph1:C10", "black", [ "v0" ] ]],"dependencies": {}
}
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