fpga驱动oled iic显示代码

以下是一个简单的FPGA驱动OLED IIC显示的代码示例：

module oled_iic_driver(
    input clk, //时钟信号
    input reset, //复位信号
    output reg [7:0] data_out, //输出数据信号
    output reg sda, //IIC SDA信号
    output reg scl //IIC SCL信号
);

//定义IIC传输状态
parameter IDLE = 2'b00; //空闲状态
parameter START = 2'b01; //起始状态
parameter WRITE = 2'b10; //写状态
parameter READ = 2'b11; //读状态

//定义OLED地址
parameter OLED_ADDR = 8'h78;

//定义IIC传输计数器
reg [3:0] cnt;

//定义IIC传输状态寄存器
reg [1:0] state;

//定义写入数据缓冲区
reg [7:0] data_in;

//初始化
initial begin
    cnt = 4'b0000;
    state = IDLE;
    data_in = 8'b00000000;
end

//状态机
always @(posedge clk) begin
    if(reset) begin
        cnt <= 4'b0000;
        state <= IDLE;
        data_in <= 8'b00000000;
        sda <= 1'b1;
        scl <= 1'b1;
    end
    else begin
        case(state)
            IDLE: begin
                sda <= 1'b1;
                scl <= 1'b1;
                if(cnt == 4'b0000) begin
                    state <= START;
                    cnt <= 4'b0001;
                end
            end
            START: begin
                sda <= 1'b0;
                if(cnt == 4'b0001) begin
                    scl <= 1'b0;
                    cnt <= 4'b0010;
                end
                else begin
                    cnt <= cnt + 1;
                end
            end
            WRITE: begin
                sda <= data_out[cnt];
                if(cnt == 4'b1000) begin
                    scl <= 1'b0;
                    cnt <= 4'b0001;
                end
                else begin
                    cnt <= cnt + 1;
                end
            end
            READ: begin
                sda <= 1'b1;
                if(cnt == 4'b1000) begin
                    scl <= 1'b0;
                    cnt <= 4'b0001;
                end
                else begin
                    cnt <= cnt + 1;
                end
            end
            default: begin
                sda <= 1'b1;
                scl <= 1'b1;
            end
        endcase
    end
end

//数据输入
always @(posedge clk) begin
    if(reset) begin
        data_in <= 8'b00000000;
    end
    else begin
        case(state)
            IDLE: begin
                data_in <= 8'b00000000;
            end
            START: begin
                data_in <= OLED_ADDR;
            end
            WRITE: begin
                data_in <= data_in << 1;
                data_in[0] <= data_out[cnt];
            end
            READ: begin
                data_in <= data_in << 1;
            end
            default: begin
                data_in <= 8'b00000000;
            end
        endcase
    end
end

endmodule

请注意，这只是一个示例代码，你需要根据你的OLED显示器和FPGA开发板进行相应的修改。