[问答]

FPGA三段式状态机里涉及到定时等待时如何处理？

问答对人有帮助，内容完整，我也想知道答案 0 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 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 DIR_UP = 2'd0,DIR_DOWN = 2'd1,DIR_EXPAND_SCOPE = 2'd2; parameter DAC_TO_TEMPERATURE_INIT = 14'd8192; //0 parameter T10MS = 32'd49_999_9; parameter T100MS = 32'd49_999_99; parameter T1S = 32'd49_999_999; / parameter T10MS = 32'd4; 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; // assign debug_pdh_ok_count_value = pdh_ok_count; /********************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**********************/ parameter PDH_OK_COUNT_N = 8'd2; parameter INIT_N = 14'd8; // N 的初始范围 parameter K = 14'd2; //K //运行状态 parameter INIT = 8'd0; //初始化 parameter RUN_INIT_I = 8'd1; //运行 parameter START_PZT_SCANNING = 8'd2; //开始锯齿波扫描 parameter WAIT = 8'd3; parameter IF_PDH_OK = 8'd4; parameter SEARCH_PDH_OK = 8'd5; parameter LOCK_IN_PROCESS = 8'd6; parameter UNLOCK_IN = 8'd7; parameter UNLOCK_IN_RETRY = 8'd8; parameter LOCK_IN = 8'd9; reg[7:0] pdh_ok_count; reg[18:0] pdh_time_count;//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; //温度输出 reg [13:0]dac_to_temperature_top; //上限 reg [13:0]dac_to_temperature_bottom; //下限 reg [13:0]N; reg [3:0]DIR; //扫描方向 //计时器 reg [25:0]time_count; reg [7:0]time_ones; //三段式状态机 reg[7:0]cstate; //当前状态 reg[7:0]nstate; //下一个状态 //第一部分说明初始状态，和current_state<=next_state //每一个时钟沿产生一次可能的状态变化 always@(posedge clk or negedge rst_n) if(!rst_n) cstate <= INIT; //复位态 else cstate <= nstate; //第二部分，状态转移，产生下一状态的整合逻辑 //状态的跳转 always@(cstate or time_ones or pdh_ok or locked) begin case (cstate) INIT: //初始化 begin if(time_ones == T20S) //20s nstate <= RUN_INIT_I; else nstate <= INIT; end RUN_INIT_I: //运行 //初始化温度输出 begin nstate <= START_PZT_SCANNING; end START_PZT_SCANNING: //开始锯齿波扫描 begin nstate <= WAIT; end WAIT: //等待锯齿波扫描 4 - 10s begin //PDH OK? //判断是否找到信号 if(pdh_ok == LOCK) nstate <= IF_PDH_OK; else nstate <= WAIT; end IF_PDH_OK: //PDH OK判断 begin if(time_ones == T2S) //2s begin if(pdh_ok_count >= PDH_OK_COUNT_N) //真信号 nstate <= SEARCH_PDH_OK; //搜索到pdh else nstate <= WAIT; //重新扫描 end else nstate <= IF_PDH_OK; end SEARCH_PDH_OK: //扫描到PDH begin //100MS等待 if(time_count == T100MS) //100ms begin nstate <= LOCK_IN_PROCESS; end end LOCK_IN_PROCESS: //锁入过程 begin if(time_ones == T2S) //2s begin if(locked == LOCK) nstate <= LOCK_IN; //已锁定 else nstate <= UNLOCK_IN; //未锁定 end end UNLOCK_IN: //未锁定 begin //锁定失败次数小于5次 if(locked_fail_count < 8'd5) begin nstate <= UNLOCK_IN_RETRY; end else begin nstate <= WAIT; end end UNLOCK_IN_RETRY: //重试锁定 begin //2S判断一次 if(time_ones == T2S) //2s begin nstate <= LOCK_IN_PROCESS; end end LOCK_IN: //已锁定 begin if(locked == UNLOCK) //unlock begin nstate <= START_PZT_SCANNING; //重新进入扫描模式 end end default:nstate <= INIT; endcase end //第三段，产生输出 always@(posedge clk or negedge rst_n) if(!rst_n) begin dac_ch1 <= 14'd8192; //0 analog_switch_1 <= OFF; analog_switch_2 <= OFF; sawtooth_control <= OFF; dac_to_temperature_i <= 14'd8192; //0V pdh_time_count <= 0; pdh_ok_count <= 8'd0; pdh_ok_delay_flag <= END; // locked_fail_count <= 8'd0; //锁定失败计数 N <= INIT_N; DIR <= DIR_UP; //init 扫描方向 time_count <= 0; time_ones <= 0; dac_to_temperature_top <= 14'd8192 + INIT_N; //上限 dac_to_temperature_bottom <= 14'd8192 - INIT_N; //下限 end else begin case(nstate) INIT: begin //系统预热20s if(time_count == T1S) //1s begin time_ones <= time_ones + 1'b1; time_count <= 0; end else time_count <= time_count + 1'b1; end RUN_INIT_I: //运行 //初始化温度输出 begin //init i = 0 time_ones <= 8'd0; dac_to_temperature_i <= 14'd8192; end START_PZT_SCANNING: //开始锯齿波扫描 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; end WAIT: //等待锯齿波扫描 4 - 10s begin //wait 4 - 10s if(time_count == T1S) //1s begin time_ones <= time_ones + 1'b1; time_count <= 0; end else time_count <= time_count + 1'b1; if(time_ones == T2S) //2s begin search_mode(); //扫描模式 time_ones <= 0; end dac_ch1 <= dac_to_temperature_i; //更新数据 pdh_ok_delay_flag <= START; //开始延时 pdh_time_count <= 0; pdh_ok_count <= 8'd0; end IF_PDH_OK: //PDH OK判断 begin //锯齿波扫描延长2S if(time_count == T1S) //1s begin time_ones <= time_ones + 1'b1; time_count <= 32'd0; end else time_count <= time_count + 1'b1; //pdh误触发处理 //开始延时 if(pdh_ok_delay_flag == START) begin if(pdh_time_count == T10MS) //ms begin pdh_ok_delay_flag <= END; pdh_time_count <= 32'd0; end else pdh_time_count <= pdh_time_count + 1'b1; end else begin if(pdh_ok == LOCK) begin pdh_ok_count <= pdh_ok_count + 1'b1; pdh_ok_delay_flag <= START; end end end SEARCH_PDH_OK: //扫描到PDH begin time_ones <= 8'd0; //stop pzt scanning analog_switch_2 <= OFF; //analog_switch_1 <= ON; sawtooth_control <= OFF; if(time_count == T100MS) //1s begin end else time_count <= time_count + 1'b1; end LOCK_IN_PROCESS: //锁入过程 begin //锁入过程 //analog_switch_2 <= OFF; analog_switch_1 <= ON; //2S判断一次 if(time_count == T1S) //1s begin time_ones <= time_ones + 1'b1; time_count <= 32'd0; end else time_count <= time_count + 1'b1; end UNLOCK_IN: //未锁定 begin //锁定失败计数 locked_fail_count <= locked_fail_count + 1'b1; time_ones <= 0; time_count <= 0; if(locked_fail_count < 8'd5) begin end else begin if(dac_to_temperature_i > 14'd0) dac_to_temperature_i <= dac_to_temperature_i - 1'b1; analog_switch_1 <= OFF; analog_switch_2 <= ON; locked_fail_count <= 8'd0; end end UNLOCK_IN_RETRY: //重试锁定 begin analog_switch_1 <= OFF; if(time_count == T1S) //1s begin time_ones <= time_ones + 1'b1; time_count <= 32'd0; end else time_count <= time_count + 1'b1; end LOCK_IN: //已锁定 begin //5S判断一次 if(time_count == T1S) //1s begin time_ones <= time_ones + 1'b1; time_count <= 32'd0; end else time_count <= time_count + 1'b1; if(time_ones == T5S) //5s begin //电压 > 1 并且处于锁定状态 if(adc_ch1_data > 16'sd6553 && dac_to_temperature_i < 14'd16383 && locked == LOCK) begin dac_to_temperature_i <= dac_to_temperature_i - 1; end else if(adc_ch1_data < -16'sd6553 && dac_to_temperature_i > 14'd0 && locked == LOCK) begin dac_to_temperature_i <= dac_to_temperature_i + 1; end //T(i) = V * step * i; dac_ch1 <= dac_to_temperature_i; time_ones <= 0; end end default:; endcase end 复制代码在我上面的三段式状态机中很多地方有涉及到，根据时间来进行状态跳转，我在产生第三段进行计时，第二段里面进行状态跳转，但跳转时如何清零time_count和time_ones呢，我现在是在下一个状态里面清，能在跳转的同时进行清零吗？在状态机里面涉及到定时一般是怎么做的啊？ 0 已退回5积分
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