24LC64使用I2C代码verilog

以下是24LC64使用I2C的Verilog代码示例：

module i2c_master(
    input clk,
    input rst_n,
    input sda_i,
    output reg sda_o,
    output reg sda_en,
    output reg scl_o,
    input  sda_ack,
    output reg sda_out,
    output reg [7:0] data_out,
    output reg data_en,
    output reg [6:0] addr_out,
    output reg addr_en,
    output reg rw_out,
    output reg rw_en,
    output reg done);

    // I2C master state machine states
    parameter IDLE       = 3'b000;
    parameter START      = 3'b001;
    parameter ADDR       = 3'b010;
    parameter DATA_READ  = 3'b011;
    parameter DATA_WRITE = 3'b100;
    parameter STOP       = 3'b101;
    parameter ERROR      = 3'b110;
    parameter WAIT_ACK   = 3'b111;

    // I2C master state machine signals
    reg [2:0] i2c_state;
    reg [7:0] i2c_reg;
    reg [2:0] i2c_bit_count;
    reg [6:0] i2c_addr;
    reg [7:0] i2c_data;
    reg       i2c_rw;

    // I2C master clock divider
    parameter DIVIDER = 5000; // 100 kHz

    // I2C master state machine clock
    reg [15:0] i2c_clk_count;

    // Register assignments
    assign sda_o  = i2c_reg[7];
    assign scl_o  = i2c_reg[6];
    assign sda_en = i2c_reg[5];
    assign data_en = i2c_reg[4];
    assign addr_en = i2c_reg[3];
    assign rw_en = i2c_reg[2];
    assign done   = i2c_reg[1];
    assign sda_out = i2c_reg[0];
    assign data_out = i2c_data;
    assign addr_out = i2c_addr;
    assign rw_out = i2c_rw;

    always @(posedge clk or negedge rst_n) begin
        if (!rst_n) begin
            // Reset i2c master state machine
            i2c_state <= IDLE;
            i2c_clk_count <= 0;
            i2c_reg <= 0;
            i2c_bit_count <= 0;
            i2c_addr <= 0;
            i2c_data <= 0;
            i2c_rw <= 0;
        end
        else begin
            // I2C master clock generator
            if (i2c_clk_count < DIVIDER) begin
                i2c_clk_count <= i2c_clk_count + 1;
            end
            else begin
                i2c_clk_count <= 0;
            end

            case (i2c_state)
                IDLE: begin
                    // Wait for start condition
                    if (!sda_i && scl_o) begin
                        i2c_state <= START;
                    end
                end

                START: begin
                    // Send start condition
                    i2c_reg <= {1'b1, 1'b1, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0};
                    i2c_state <= ADDR;
                end

                ADDR: begin
                    // Send address
                    case (i2c_bit_count)
                        0: begin
                            // First bit is always 1 for write, 0 for read
                            i2c_data <= {1'b1, i2c_addr[6:0], 1'b0};
                            i2c_bit_count <= i2c_bit_count + 1;
                        end

                        8: begin
                            // Wait for ACK
                            i2c_reg <= {1'b1, 1'b1, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0};
                            i2c_state <= WAIT_ACK;
                        end

                        default: begin
                            // Send next bit of address
                            i2c_data <= i2c_addr[i2c_bit_count-1];
                            i2c_bit_count <= i2c_bit_count + 1;
                        end
                    endcase
                end

                DATA_WRITE: begin
                    // Send data
                    case (i2c_bit_count)
                        0: begin
                            // Wait for ACK
                            i2c_reg <= {1'b1, 1'b1, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0};
                            i2c_state <= WAIT_ACK;
                        end

                        8: begin
                            // Send next byte of data
                            i2c_data <= i2c_data >> 8;
                            i2c_bit_count <= 1;
                        end

                        default: begin
                            // Send next bit of data
                            i2c_data <= i2c_data << 1;
                            i2c_bit_count <= i2c_bit_count + 1;
                        end
                    endcase
                end

                DATA_READ: begin
                    // Receive data
                    case (i2c_bit_count)
                        0: begin
                            // Wait for ACK
                            i2c_reg <= {1'b1, 1'b1, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0};
                            i2c_state <= WAIT_ACK;
                        end

                        8: begin
                            // Read next byte of data
                            i2c_data <= i2c_data << 8;
                            i2c_bit_count <= 1;
                        end

                        default: begin
                            // Read next bit of data
                            i2c_data <= {i2c_data[6:0], sda_i};
                            i2c_bit_count <= i2c_bit_count + 1;
                        end
                    endcase
                end

                WAIT_ACK: begin
                    // Wait for ACK
                    if (sda_ack) begin
                        case (i2c_rw)
                            0: begin
                                // Write data
                                if (i2c_bit_count == 8) begin
                                    i2c_state <= STOP;
                                end
                                else begin
                                    i2c_state <= DATA_WRITE;
                                end
                            end

                            1: begin
                                // Read data
                                if (i2c_bit_count == 8) begin
                                    i2c_data <= sda_i;
                                    i2c_state <= STOP;
                                end
                                else begin
                                    i2c_state <= DATA_READ;
                                end
                            end
                        endcase
                    end
                    else begin
                        // No ACK received
                        i2c_state <= ERROR;
                    end
                end

                STOP: begin
                    // Send stop condition
                    i2c_reg <= {1'b1, 1'b1, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0};
                    i2c_state <= IDLE;
                end

                ERROR: begin
                    // Error condition
                    i2c_reg <= {1'b1, 1'b1, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1};
                    i2c_state <= STOP;
                end
            endcase
        end
    end

endmodule

此代码是一个基本的I2C主机状态机，可以通过控制地址、读/写和数据来与24LC64通信。请注意，这只是一个示例代码，您需要根据您的设计和具体的芯片规格进行修改。