oled显示 spi驱动 fpga代码

以下是一个基于SPI接口驱动OLED显示屏的FPGA代码示例，仅供参考：

module OLED_SPI(
    input clk,
    input rstn,
    input [7:0] data_in,
    input start,
    output reg CSB,
    output reg DCB,
    output reg SCLK,
    output reg [7:0] MOSI
    );

    reg [7:0] data_out;
    reg [7:0] data_temp;
    reg [7:0] data_buf [0:255];

    // 控制信号默认低电平
    assign CSB = 1'b0;
    assign DCB = 1'b0;
    assign SCLK = 1'b0;

    reg [7:0] index;
    reg [7:0] counter;

    initial begin
        index = 8'h40; // 设置起始行
        counter = 0;
    end

    always @(posedge clk) begin
        if (!rstn) begin
            CSB <= 1'b0;
            DCB <= 1'b0;
            SCLK <= 1'b0;
            MOSI <= 8'h00;
            index <= 8'h40;
            counter <= 0;
            data_temp <= 8'h00;
        end else begin
            if (start) begin
                if (counter == 0) begin
                    // 选择数据传输模式
                    DCB <= 1'b1;
                    // 选择OLED模块
                    CSB <= 1'b1;
                end else if (counter == 1) begin
                    // 关闭OLED显示
                    data_out <= 8'hae;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                end else if (counter == 2) begin
                    // 设置OLED显示时钟分频比
                    data_out <= 8'hd5;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                    data_out <= 8'h80;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                end else if (counter == 3) begin
                    // 设置显示位置
                    data_out <= 8'h20;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                    data_out <= 8'h00;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                    data_out <= 8'h21;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                    data_out <= 8'h00;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                    data_out <= 8'h22;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                    data_out <= 8'h00;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                end else if (counter == 4) begin
                    // 设置扫描顺序
                    data_out <= 8'hc8;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                end else if (counter == 5) begin
                    // 设置显示偏移量
                    data_out <= 8'hd3;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                    data_out <= 8'h00;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                end else if (counter == 6) begin
                    // 设置显示模式
                    data_out <= 8'hda;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                    data_out <= 8'h12;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                end else if (counter == 7) begin
                    // 设置OLED显示亮度
                    data_out <= 8'h81;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                    data_out <= 8'hcf;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                end else if (counter >= 8 && counter <= 135) begin
                    // 设置OLED显示数据
                    data_out <= data_buf[counter - 8];
                    data_buf[index] <= data_out;
                    index <= index + 1;
                end else if (counter == 136) begin
                    // 打开OLED显示
                    data_out <= 8'haf;
                    data_buf[index] <= data_out;
                    index <= index + 1;
                end else if (counter == 137) begin
                    // 继续更新屏幕数据
                    DCB <= 1'b0;
                    CSB <= 1'b0;
                    index <= index + 1;
                end
                counter <= counter + 1;
                data_temp <= data_in;
            end else begin
                data_temp <= 8'h00;
            end

            // 时序控制
            if (counter >= 2 && counter <= 137) begin
                SCLK <= ~SCLK;
                MOSI <= data_temp[7];
                data_temp <= {data_temp[6:0], 1'b0};
            end
        end
    end
endmodule

以上代码仅为示例，具体实现过程可能需要根据具体的OLED显示屏型号和FPGA芯片型号进行修改。同时，需要注意时序控制的精度和调试过程中可能出现的问题。