一种浅显的脉宽控制的方案

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电梯直达

楼主

邹逸谦|

楼主 | 2021-9-30 10:52 | 只看该作者回帖奖励

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脉宽控制, se, npu, Input, laser, PWM

module bx (
input       clk,
input       rst_n,
input       laser_tx_en,
input [24:0] pwm_width,
input [24:0] pwm_cycle,
input [5:0]  laser_tx_num,
output    laser_on,
output    frame_sync,
output    laser_tx_done
);

reg  [24 : 0] pwm_cnt;
reg          laser_on_i;
reg  [5:0]  num_cnt;

always @(posedge clk or negedge rst_n) begin
      if (~rst_n) begin
         pwm_cnt <= 25'd0;
      end
      else if (laser_tx_en)  begin
         if (pwm_cnt == pwm_cycle)  begin
            pwm_cnt <= 25'd0;
         end
         else
            pwm_cnt <= pwm_cnt + 25'd1;
      end
      else
         pwm_cnt <=  25'd0;
end

always @(posedge clk or negedge rst_n) begin
      if (~rst_n) begin
         laser_on_i <=  1'd0;
      end
      else if (laser_tx_en) begin
         case (num_cnt > laser_tx_num)
            1'b1: laser_on_i <=  1'd0;
            1'b0:if (pwm_cnt <= pwm_width) begin
                     laser_on_i <=  1'd1;
                  end
                  else if (pwm_cnt >= pwm_width) begin
                     laser_on_i <=  1'd0;
                  end
                  else
                     laser_on_i <=  laser_on_i;
            default: laser_on_i  <=  1'd0;
         endcase
      end
end
always @(posedge clk or negedge rst_n) begin
      if (~rst_n) begin
         num_cnt <=  6'd0;
      end
      else if (pwm_cnt == pwm_cycle)begin
         num_cnt <=  num_cnt + 6'd1;
      end
      else if (num_cnt > laser_tx_num) begin
         num_cnt <=  6'd0;
      end
end

assign laser_on       =  laser_on_i;
assign frame_sync    =  ((pwm_cnt == 1) & laser_on_i) ? 1'd1 : 1'd0;
assign laser_tx_done =  (num_cnt > laser_tx_num) ? 1'd1 : 1'd0;
endmodule

控制脉冲与发射次数，达到一般的通用水准。

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一种浅显的脉宽控制的方案

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