fpga oled iic 代码

以下是一个使用 FPGA 控制 OLED 显示屏的 I2C 通信的示例代码：

module FPGA_OLED (
    input wire clk,             // 时钟信号
    input wire rst,             // 复位信号
    output wire sda,            // I2C 数据线
    inout wire scl              // I2C 时钟线
);

    reg [7:0] data;             // 存储要发送的数据

    reg [3:0] state;            // I2C 状态机状态
    reg [7:0] counter;          // 计数器

    wire sda_in;                // 输入的 SDA 信号
    wire sda_out;               // 输出的 SDA 信号

    // I2C 状态定义
    localparam IDLE = 0;
    localparam START = 1;
    localparam ADDRESS_WRITE = 2;
    localparam DATA_WRITE = 3;
    localparam STOP = 4;

    // I2C 操作定义
    localparam CMD_INIT = 8'h80;       // 初始化 OLED 显示屏命令
    localparam CMD_DISPLAY_ON = 8'hAF; // 打开 OLED 显示命令

    // I2C 状态机
    always @(posedge clk) begin
        if (rst) begin
            state <= IDLE;
            counter <= 0;
        end else begin
            case (state)
                IDLE:
                    if (counter == 0) begin
                        state <= START;
                        counter <= 7;
                    end else begin
                        state <= IDLE;
                        counter <= counter - 1;
                    end

                START:
                    if (counter == 0) begin
                        sda <= 0;
                        scl <= 0;
                        state <= ADDRESS_WRITE;
                        counter <= 7;
                    end else begin
                        state <= START;
                        counter <= counter - 1;
                    end

                ADDRESS_WRITE:
                    if (counter == 0) begin
                        sda <= 0;
                        scl <= 1;
                        state <= DATA_WRITE;
                        counter <= 7;
                    end else begin
                        state <= ADDRESS_WRITE;
                        counter <= counter - 1;
                    end

                DATA_WRITE:
                    if (counter == 0) begin
                        sda <= data[7];
                        scl <= 0;
                        state <= STOP;
                        counter <= 7;
                    end else begin
                        sda <= data[counter - 1];
                        state <= DATA_WRITE;
                        counter <= counter - 1;
                    end

                STOP:
                    if (counter == 0) begin
                        sda <= 1;
                        scl <= 1;
                        state <= IDLE;
                    end else begin
                        state <= STOP;
                        counter <= counter - 1;
                    end

                default:
                    state <= IDLE;
            endcase
        end
    end

    // I2C 数据输入输出
    assign sda_in = sda;
    assign sda_out = (state == DATA_WRITE) ? 1'bz : sda;

    // OLED 初始化和显示命令
    always @(posedge clk) begin
        if (rst) begin
            data <= 0;
        end else begin
            case (state)
                ADDRESS_WRITE:
                    if (counter == 7) begin
                        data <= CMD_INIT;
                    end else if (counter == 6) begin
                        data <= CMD_DISPLAY_ON;
                    end else begin
                        data <= 0;
                    end

                DATA_WRITE:
                    data <= 0;

                default:
                    data <= 0;
            endcase
        end
    end

endmodule

这是一个简单的 Verilog 代码示例，用于在 FPGA 上通过 I2C 协议控制 OLED 显示屏。这段代码包含了一个简单的 I2C 状态机和相关的信号处理逻辑。你可以根据你的具体硬件平台和 OLED 显示屏的规格进行相应的修改和适配。