verilog i2c驱动

以下是一个简单的Verilog代码示例，用于实现I2C总线驱动器：

module i2c_driver (
    input clk, //时钟信号
    input rstn, //复位信号
    input sda_in, //SDA输入信号
    input scl_in, //SCL输入信号
    output reg sda_out, //SDA输出信号
    output reg scl_out //SCL输出信号
);

//状态机
typedef enum {
    IDLE, //空闲状态
    START, //启动状态
    WRITE, //写状态
    READ, //读状态
    STOP //停止状态
} i2c_state;

reg [7:0] addr; //I2C设备地址
reg [7:0] data; //I2C数据
reg [3:0] bit_cnt; //位计数器
reg [2:0] state; //状态机状态

//状态机转移
always @(posedge clk or negedge rstn) begin
    if (!rstn) begin
        state <= IDLE;
        bit_cnt <= 0;
        sda_out <= 1;
        scl_out <= 1;
    end else begin
        case (state)
            IDLE: begin
                if (~sda_in && scl_in) begin
                    state <= START;
                end
            end
            START: begin
                addr <= 7'h50; //设置I2C设备地址
                sda_out <= 0;
                scl_out <= 1;
                state <= WRITE;
            end
            WRITE: begin
                if (bit_cnt < 8) begin
                    sda_out <= data[bit_cnt];
                    scl_out <= 1;
                    bit_cnt <= bit_cnt + 1;
                end else begin
                    sda_out <= 1;
                    scl_out <= 1;
                    bit_cnt <= 0;
                    state <= READ;
                end
            end
            READ: begin
                if (bit_cnt < 8) begin
                    scl_out <= 0;
                    bit_cnt <= bit_cnt + 1;
                end else begin
                    data <= sda_in;
                    sda_out <= 1;
                    scl_out <= 1;
                    bit_cnt <= 0;
                    state <= STOP;
                end
            end
            STOP: begin
                sda_out <= 1;
                scl_out <= 1;
                state <= IDLE;
            end
        endcase
    end
end

endmodule

这段代码实现了一个简单的I2C总线驱动器，可以启动、写入和读取I2C设备。请注意，这只是一个基础示例，需要根据具体的应用场景进行修改和扩展。