写一段ina226的Verilog代码，包含初始化内容

以下是一个简单的ina226 Verilog代码，包含初始化内容：

module ina226 (
    input clk,
    input rst,
    input [1:0] slave_address,
    output reg [15:0] bus_voltage,
    output reg [15:0] shunt_voltage,
    output reg [15:0] current,
    output reg [15:0] power
);

// constants for ina226 register addresses
parameter CONFIG_REG_ADDR = 16'h00;
parameter SHUNT_VOLTAGE_REG_ADDR = 16'h01;
parameter BUS_VOLTAGE_REG_ADDR = 16'h02;
parameter POWER_REG_ADDR = 16'h03;
parameter CURRENT_REG_ADDR = 16'h04;

// constants for ina226 configuration register
parameter RESET_BIT = 1;
parameter AVERAGING_MODE_BIT = 2;
parameter VBUS_CT_BIT = 3;
parameter SHUNT_CT_BIT = 7;
parameter MODE_BIT = 9;
parameter PGA_BIT = 11;
parameter BADC_BIT = 13;
parameter SADC_BIT = 15;

// default values for ina226 configuration register
parameter DEFAULT_CONFIG = {RESET_BIT, 3'b000, 2'b11, 1'b1, 3'b111, 1'b1, 3'b111, 3'b111};

// internal registers
reg [15:0] config_reg;
reg [15:0] shunt_voltage_reg;
reg [15:0] bus_voltage_reg;
reg [15:0] power_reg;
reg [15:0] current_reg;

// initialize internal registers
initial begin
    config_reg <= DEFAULT_CONFIG;
    shunt_voltage_reg <= 16'h0000;
    bus_voltage_reg <= 16'h0000;
    power_reg <= 16'h0000;
    current_reg <= 16'h0000;
end

// read and write functions for ina226 registers
function void write_reg;
    input [15:0] addr;
    input [15:0] data;
    begin
        // send slave address and register address
        // wait for ACK
        // send data
        // wait for ACK
    end
endfunction

function void read_reg;
    input [15:0] addr;
    output reg [15:0] data;
    begin
        // send slave address and register address
        // wait for ACK
        // send repeated start
        // send slave address with R/W bit set
        // wait for ACK
        // read data
        // send NACK
    end
endfunction

// update internal registers with latest readings
task read_data;
    begin
        read_reg(SHUNT_VOLTAGE_REG_ADDR, shunt_voltage_reg);
        read_reg(BUS_VOLTAGE_REG_ADDR, bus_voltage_reg);
        read_reg(POWER_REG_ADDR, power_reg);
        read_reg(CURRENT_REG_ADDR, current_reg);
    end
endtask

// update configuration register and internal registers
task update_config;
    input [15:0] new_config;
    begin
        write_reg(CONFIG_REG_ADDR, new_config);
        config_reg <= new_config;
        read_data;
    end
endtask

// initialize ina226
initial begin
    // set default configuration
    update_config(DEFAULT_CONFIG);
end

// main logic
always @(posedge clk) begin
    if (rst) begin
        // reset internal registers
        config_reg <= DEFAULT_CONFIG;
        shunt_voltage_reg <= 16'h0000;
        bus_voltage_reg <= 16'h0000;
        power_reg <= 16'h0000;
        current_reg <= 16'h0000;
    end else begin
        // update configuration register if necessary
        if (config_reg != DEFAULT_CONFIG) begin
            update_config(config_reg);
        end
        
        // update internal registers with latest readings
        read_data;
        
        // update output ports with latest data
        bus_voltage <= bus_voltage_reg;
        shunt_voltage <= shunt_voltage_reg;
        power <= power_reg;
        current <= current_reg;
    end
end

endmodule