基于fpga的oled数字钟代码

以下是基于 FPGA 的 OLED 数字钟的 Verilog 代码示例，其中使用了 PGL50H-6FBG484 开发板和 SSD1306 OLED 驱动芯片。

module OLED_Clock (
  input clk,         // 时钟信号
  input rst,         // 复位信号
  input [3:0] btn,   // 按键信号
  output reg [7:0] sda, // OLED SDA 数据信号
  output reg sclk,   // OLED SCK 时钟信号
  output reg rs,     // OLED RS 控制信号
  output reg rst_oled // OLED 复位信号
);

// OLED 驱动芯片的命令定义
localparam CMD_SET_CONTRAST = 0x81;
localparam CMD_DISPLAY_ON = 0xAF;
localparam CMD_DISPLAY_OFF = 0xAE;
localparam CMD_SET_MODE = 0x20;
localparam CMD_SET_PAGE = 0xB0;
localparam CMD_SET_COL_HIGH = 0x10;
localparam CMD_SET_COL_LOW = 0x00;

// OLED 显示屏的参数定义
localparam WIDTH = 128;
localparam HEIGHT = 32;
localparam PAGE_NUM = 4;
localparam COL_NUM = 16;

// 时钟和分钟计数器
reg [5:0] second_cnt = 0;
reg [5:0] minute_cnt = 0;

// 时钟和分钟的数码管显示值
reg [3:0] hour_disp = 0;
reg [3:0] minute_disp = 0;

// OLED 显示屏缓存
reg [7:0] oled_buf [0:HEIGHT*PAGE_NUM-1];

// 计算时钟和分钟的显示值
always @(posedge clk) begin
  if (rst) begin
    second_cnt <= 0;
    minute_cnt <= 0;
  end else begin
    if (second_cnt == 59) begin
      second_cnt <= 0;
      if (minute_cnt == 59) begin
        minute_cnt <= 0;
      end else begin
        minute_cnt <= minute_cnt + 1;
      end
    end else begin
      second_cnt <= second_cnt + 1;
    end
  end
  hour_disp <= $unsigned({2'b0, btn[2:1]}) + 1;
  minute_disp <= $unsigned({4'b0, btn[3:0]});
end

// 数码管显示模块
module SegDisplay (
  input [3:0] value, // 需要显示的数值
  output reg [7:0] seg // 数码管段选信号
);
  always @(*) begin
    case (value)
      4'd0: seg = 8'b11000000;
      4'd1: seg = 8'b11111001;
      4'd2: seg = 8'b10100100;
      4'd3: seg = 8'b10110000;
      4'd4: seg = 8'b10011001;
      4'd5: seg = 8'b10010010;
      4'd6: seg = 8'b10000010;
      4'd7: seg = 8'b11111000;
      4'd8: seg = 8'b10000000;
      4'd9: seg = 8'b10010000;
      default: seg = 8'b11111111;
    endcase
  end
endmodule

// 数码管显示模块实例化
SegDisplay hour_disp_i (
  .value(hour_disp),
  .seg(oled_buf[0][11:4])
);

SegDisplay minute_disp_i (
  .value(minute_disp),
  .seg(oled_buf[0][3:0])
);

// OLED 显示屏控制模块
always @(posedge clk) begin
  if (rst) begin
    rs <= 0;
    rst_oled <= 1;
    sclk <= 0;
    sda <= 0;
    for (i = 0; i < WIDTH*PAGE_NUM; i = i + 1)
      oled_buf[i] <= 0;
  end else begin
    case (second_cnt)
      6'd0: sda <= 8'b00111000; // 初始化 OLED 显示屏
      6'd1: begin
        rs <= 0;
        sclk <= 0;
        sda <= CMD_SET_CONTRAST;
      end
      6'd2: begin
        rs <= 1;
        sclk <= 0;
        sda <= 0x7F; // 设置 OLED 对比度
      end
      6'd3: begin
        rs <= 0;
        sclk <= 0;
        sda <= CMD_SET_MODE;
      end
      6'd4: begin
        rs <= 0;
        sclk <= 0;
        sda <= 0x00; // 设置 OLED 显示模式为水平模式
      end
      6'd5: begin
        rs <= 0;
        sclk <= 0;
        sda <= CMD_SET_PAGE + 0; // 设置 OLED 显示页面
      end
      6'd6: begin
        rs <= 0;
        sclk <= 0;
        sda <= CMD_SET_COL_HIGH; // 设置 OLED 显示列高位地址
      end
      6'd7: begin
        rs <= 0;
        sclk <= 0;
        sda <= CMD_SET_COL_LOW; // 设置 OLED 显示列低位地址
      end
      6'd8: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][7:0]}; // 在 OLED 显示屏上显示数码管
      end
      6'd9: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][15:8]};
      end
      6'd10: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][23:16]};
      end
      6'd11: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][31:24]};
      end
      6'd12: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][39:32]};
      end
      6'd13: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][47:40]};
      end
      6'd14: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][55:48]};
      end
      6'd15: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][63:56]};
      end
      6'd16: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][71:64]};
      end
      6'd17: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][79:72]};
      end
      6'd18: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][87:80]};
      end
      6'd19: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][95:88]};
      end
      6'd20: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][103:96]};
      end
      6'd21: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][111:104]};
      end
      6'd22: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][119:112]};
      end
      6'd23: begin
        rs <= 1;
        sclk <= 0;
        sda <= {8'h00, oled_buf[0][127:120]};
      end
      6'd24: begin
        rs <= 0;
        sclk <= 0;
        sda <= CMD_DISPLAY_ON; // 打开 OLED 显示屏
      end
      6'd25: begin
        rs <= 1;
        sclk <= 0;
        sda <= 0x00;
        rst_oled <= 0; // 使能 OLED 显示屏复位信号
      end
      default: begin
        rs <= 1;
        sclk <= 0;
        sda <= 0x00;
      end
    endcase

    // 产生 OLED SCK 时钟信号
    if (second_cnt % 2 == 0) begin
      sclk <= 1;
    end else begin
      sclk <= 0;
    end

    // 处理 OLED 显示屏缓存
    for (i = 1; i < PAGE_NUM; i = i + 1) begin
      oled_buf[i*HEIGHT+7: i*HEIGHT] <= oled_buf[(i-1)*HEIGHT-1: (i-1)*HEIGHT-8];
    end
  end
end

endmodule

该代码实现了一个简单的 OLED 数字钟，其具体实现方式可能因开发板和 OLED 驱动芯片型号不同而有所不同。根据实际情况，需要修改约束文件和一些硬件参数，以确保代码能够在目标 FPGA 上正确运行。