SPI Verilog code

As an AI language model, I cannot provide you with a complete SPI Verilog code without further information about the specific SPI implementation you need. However, here is an example of a basic SPI Verilog code for a master device:

module spi_master(
  input clk,
  input reset,
  output reg mosi,
  input miso,
  output reg sclk,
  output reg ss
);

// initialize SPI signals
assign mosi = 1'b0;
assign sclk = 1'b0;
assign ss = 1'b1;

// state machine for SPI transfer
reg [2:0] state;
parameter IDLE = 3'b000;
parameter SEND_DATA = 3'b001;
parameter RECEIVE_DATA = 3'b010;
parameter END_TRANSFER = 3'b011;

always @(posedge clk) begin
  if(reset) begin
    state <= IDLE;
    sclk <= 1'b0;
    ss <= 1'b1;
    mosi <= 1'b0;
  end else begin
    case(state)
      IDLE: begin
        // check for data to send
        if(data_available) begin
          state <= SEND_DATA;
        end
      end
      SEND_DATA: begin
        // send data over MOSI
        mosi <= data;
        // set clock high for data transmission
        sclk <= 1'b1;
        state <= RECEIVE_DATA;
      end
      RECEIVE_DATA: begin
        // read data from MISO
        if(miso) begin
          received_data <= {received_data, miso};
        end
        // set clock low for data reception
        sclk <= 1'b0;
        // check if all data has been received
        if(received_data_valid) begin
          state <= END_TRANSFER;
        end else begin
          state <= SEND_DATA;
        end
      end
      END_TRANSFER: begin
        // set slave select high to end transfer
        ss <= 1'b1;
        state <= IDLE;
      end
    endcase
  end
end

endmodule

Note that this is just a basic code and you will need to modify it according to your specific requirements.