求助fpga用复位按键复位偶尔出现复位不成功，在仿真中复位没有任何问题-reallmy的回答

FPGA

求助fpga用复位按键复位偶尔出现复位不成功，在仿真中复位没有任何问题

2019-07-15 21:10发布

站内问答 / FPGA

3165 4

`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 13:38:11 11/09/2017
// Design Name:
// Module Name: auto_lock
// Project Name:
// Target Devices:
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module auto_lock(
input clk, //系统时钟
input rst_n, //系统复位
input lock_signal, //失锁锁定输入
output reg analog_switch_1, //模拟开关1输出
output reg analog_switch_2, //模拟开关2输出
output reg [13:0] dac_ch1, //温度dac
// input sawtooth_frequence, //锯齿波频率
output reg sawtooth_control, //锯齿波控制
input signed [15:0]adc_ch1_data, //adc ch1电压值
//按键输入
input key1_in,
input key2_in,
input key3_in,
input key4_in,
//系统状态指示
output lock_status_led, //led
//DEBUG数据
output [23:0]debug_state_value,
output [23:0]debug_pdh_ok_count_value
);
parameter ON = 1'b1,OFF = 1'b0;
parameter LOCK = 1'b1,UNLOCK = 1'b0;
parameter START = 1'b1,END = 1'b0;
// parameter T100MS = 32'd49_999_99;
// parameter T1S = 32'd49_999_999;
parameter T100MS = 32'd49;
parameter T1S = 32'd49_9;
parameter T2S = 8'd2;
parameter T5S = 8'd5;
parameter T10S = 8'd10;
parameter T20S = 8'd20;
//temperture search zero point
//parameter EXPERIENCE = 14'd8540; //经验值
assign debug_state_value = auto_lock_state;
assign debug_pdh_ok_count_value = pdh_ok_count;
/**********************按键模块*************************/
keys keys_model(
.clk (clk), //系统时钟
.rst_n (rst_n), //系统复位
//按键输入
.key1_in (key1_in),
.key2_in (key2_in),
.key3_in (key3_in),
.key4_in (key4_in),
//按键输出
.key1_scan (key1_scan),
.key2_scan (key2_scan),
.key3_scan (key3_scan),
.key4_scan (key4_scan)
);
/***********************锁定信号触发边沿检测*************************/
lock_signal_edge_check lock_signal_edge_check_model(
.clk (clk), //系统时钟
.rst_n (rst_n), //系统复位
.lock_signal(lock_signal),
.locked (locked),
.pdh_ok (pdh_ok),
.lock_status_led (lock_status_led)
);
/***********************系统运行*************************/
reg[7:0] pdh_ok_count;
parameter pdh_ok_count_N_INIT = 8'd3;
reg[7:0] pdh_ok_count_N;
reg[31:0] pdh_time_count;
parameter pdh_time_INIT = 32'd999_999;
reg[31:0] pdh_time; //在锯齿波为1Hz延时为20ms 频率越高锁定时间越短
reg pdh_ok_delay_flag; //pdh延时标志
reg [7:0]locked_fail_count; //锁定失败计数
reg [13:0]dac_to_temperature_i;
reg [13:0]dac_to_temperature_spare;//备份值
parameter init_N = 14'd8; // N 的初始范围
reg [13:0]N;
parameter init_K = 14'd2; //K 的初始值
reg [13:0]K;
parameter init_DIR = 4'd1; //扫描方向初始为正
reg [3:0]DIR; //扫描方向
reg [31:0]time_count;
reg [7:0]time_ones;
reg [7:0]auto_lock_state;
reg [7:0]system_run_task_state;
reg key1buf,key2buf,key3buf,key4buf;
always@(posedge clk)
begin
if(!rst_n) //低电平复位
begin
auto_lock_state<= 8'd0;
end
else
begin
case (auto_lock_state)
8'd0: //初始化
begin
dac_to_temperature_spare <= 14'd8192; //0V
dac_to_temperature_i <= 14'd8192; //0V
dac_ch1 <= dac_to_temperature_i;
analog_switch_1 <= OFF;
analog_switch_2 <= OFF;
sawtooth_control <= OFF;
time_count <= 0;
time_ones <= 0;
key1buf <= 2'd0;
key2buf <= 2'd0;
auto_lock_state <= 8'd1;
end
8'd1: //运行
begin
dac_ch1 <= dac_to_temperature_i;
//系统预热20s
if(time_count == T1S) //1s
begin
time_ones <= time_ones + 1'b1;
if(time_ones == T20S) //20s
begin
//进入正常运行模式
dac_to_temperature_spare <= dac_to_temperature_i;
time_ones <= 0;
time_count <= 0;
system_run_task_state <= 8'd0;
auto_lock_state <= 8'd3;
end
else
time_count <= 0;
end
else
begin
time_count <= time_count + 1'b1;
//按键按下进行快速搜索
key3buf <= key3_scan;
if({key3buf,key3_scan} == 2'b10)
begin
time_ones <= 0;
time_count <= 0;
auto_lock_state <= 8'd2;
end
end
end
8'd2: //快速搜索
begin
fast_search_task();
end
8'd3:
begin //模块运行
system_run_task();
end
default:
auto_lock_state <= 8'd0;
endcase
end
end
//快速搜索模块的任务
task fast_search_task();
begin
key1buf <= key1_scan;
if({key1buf,key1_scan} == 2'b10 && dac_to_temperature_i < 14'd16373) //下降沿
begin
dac_to_temperature_i <= dac_to_temperature_i + 10;
dac_ch1 <= dac_to_temperature_i;
end
key2buf <= key2_scan;
if({key2buf,key2_scan} == 2'b10 && dac_to_temperature_i > 14'd10) //下降沿
begin
dac_to_temperature_i <= dac_to_temperature_i - 10;
dac_ch1 <= dac_to_temperature_i;
end
//模块运行
key4buf <= key4_scan;
if({key4buf,key4_scan} == 2'b10)
begin
dac_to_temperature_spare <= dac_to_temperature_i;
system_run_task_state <= 8'd0;
auto_lock_state <= 8'd3;
end
end
endtask
//系统运行任务
task system_run_task();
begin
case(system_run_task_state)
8'd0: //初始化
begin
time_count <= 0;
time_ones <= 0;
pdh_ok_count <= 8'd0;
pdh_ok_count_N <= 8'd3;
pdh_time <= pdh_time_INIT;
pdh_ok_delay_flag <= END;
locked_fail_count <= 8'd0; //锁定失败计数
analog_switch_1 <= OFF;
analog_switch_2 <= OFF;
sawtooth_control <= OFF;
system_run_task_state <= 8'd1;
end
8'd1:
begin
//init i = 0
dac_to_temperature_i <= dac_to_temperature_spare;
N <= init_N;
K <= init_K;
DIR <= init_DIR; //init 扫描方向
system_run_task_state <= 8'd2;
end
8'd2:
begin
//start pzt scanning
analog_switch_1 <= OFF;
analog_switch_2 <= ON;
//开启锯齿波扫描
sawtooth_control <= ON;
//T(i) = V * step * i;
dac_ch1 <= dac_to_temperature_i;
time_count <= 0;
time_ones <= 0;
system_run_task_state <= 8'd3;
end
8'd3:
begin
//wait 4 - 10s
if(time_count == T1S) //1s
begin
time_ones <= time_ones + 1'b1;
if(time_ones == T2S) //2s
begin
search_mode(); //扫描模式
dac_ch1 <= dac_to_temperature_i; //更新数据
time_ones <= 0;
end
time_count <= 0;
end
else
begin
time_count <= time_count + 1'b1;
//PDH OK? //判断是否找到信号
if(pdh_ok == LOCK)
begin
pdh_ok_count <= pdh_ok_count + 1'b1;
pdh_ok_delay_flag <= START; //开始延时
time_count <= 0;
time_ones <= 0;
pdh_time_count <= 0;
system_run_task_state <= 8'd4;
end
end
end
8'd4: //PDH OK Yes
begin
//锯齿波扫描延长2S
if(time_count == T1S) //1s
begin
time_ones <= time_ones + 1'b1;
if(time_ones == T2S) //2s
begin
if(pdh_ok_count >= pdh_ok_count_N ) //真信号
begin
//pdh_ok_count <= 8'd0;
pdh_time_count <= 0;
system_run_task_state <= 8'd5; //搜索到pdh
end
else
begin
system_run_task_state <= 8

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4条回答

reallmy

2019-07-16 10:42

1. 异步复位，同步解复位。
2. 时序问题，如果是状态机跳转不正常有可能是时序不过导致的

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