fpga实现ws2812代码

以下是FPGA实现WS2812代码的示例：

module WS2812 (
  input clk,
  input rst,
  input [23:0] data_in,
  output reg [2:0] led_out
);

reg [23:0] counter;
reg [7:0] bit_counter;
reg [1:0] state;

always @(posedge clk, posedge rst) begin
  if (rst) begin
    counter <= 0;
    bit_counter <= 0;
    state <= 0;
    led_out <= 0;
  end
  else begin
    case(state)
      0: begin // Start Bit
        counter <= counter + 1;
        if (counter == 30) begin
          counter <= 0;
          state <= 1;
        end
      end
      1: begin // Data Bits
        counter <= counter + 1;
        if (counter == 6) begin
          counter <= 0;
          if (data_in[bit_counter]) begin
            led_out <= led_out + 1;
          end
          bit_counter <= bit_counter + 1;
          if (bit_counter == 24) begin
            bit_counter <= 0;
            state <= 2;
          end
        end
      end
      2: begin // End Bit
        counter <= counter + 1;
        if (counter == 30) begin
          counter <= 0;
          state <= 0;
        end
      end
    endcase
  end
end

endmodule

该代码使用Verilog编写，实现了一个简单的有限状态机来控制WS2812的数据传输。在每个时钟周期中，状态机会更新其状态和输出LED数据。这个例子代码中的时钟速度为50MHz，因此数据传输速度为800KHz。根据实际情况，可能需要对计数器和状态机进行微调，以确保正确的数据传输。