使用Verilog实现一个带有spicmd,spiadr,spilenspidum,intcfg端口的spi协议
时间: 2023-11-24 22:57:56 浏览: 35
以下是带有spicmd,spiadr,spilenspidum,intcfg端口的spi协议的Verilog实现:
```
module spi_protocol (
input clk,
input rst,
input spicmd,
input [7:0] spiadr,
input [7:0] spilenspidum,
input [7:0] intcfg,
output [7:0] spi_data_out,
input [7:0] spi_data_in
);
// Define state machine states
parameter IDLE = 0;
parameter CMD = 1;
parameter ADDR = 2;
parameter LEN = 3;
parameter DATA = 4;
// Define internal signals
reg [7:0] spi_cmd_reg;
reg [7:0] spi_addr_reg;
reg [7:0] spi_len_reg;
reg [7:0] spi_data_in_reg;
reg [7:0] spi_data_out_reg;
reg [7:0] spi_data[255:0];
reg [7:0] spi_data_index;
reg [7:0] intcfg_reg;
reg [7:0] spi_clk_div;
// Define state machine signals
reg [2:0] state;
reg spi_cs;
reg spi_clk;
reg spi_mosi;
wire spi_miso;
// Define clock divider for spi_clk
always @ (posedge clk) begin
if (spi_clk_div == 0) begin
spi_clk_div <= spilenspidum;
spi_clk <= ~spi_clk;
end else begin
spi_clk_div <= spi_clk_div - 1;
end
end
// Define state machine
always @ (posedge clk) begin
if (rst) begin
state <= IDLE;
spi_cs <= 1'b1;
spi_clk <= 1'b0;
spi_mosi <= 1'b0;
spi_data_index <= 0;
intcfg_reg <= intcfg;
end else begin
case (state)
IDLE: begin
if (spicmd) begin
spi_cmd_reg <= spi_data_in;
state <= CMD;
end
end
CMD: begin
if (spi_cs == 1'b0) begin
spi_mosi <= spi_cmd_reg[7];
spi_cmd_reg <= spi_cmd_reg << 1;
end
if (spi_clk == 1'b1) begin
spi_mosi <= spi_cmd_reg[7];
spi_cmd_reg <= spi_cmd_reg << 1;
if (spi_cmd_reg == 0) begin
state <= ADDR;
end
end
end
ADDR: begin
if (spi_cs == 1'b0) begin
spi_mosi <= spi_addr_reg[7];
spi_addr_reg <= spi_addr_reg << 1;
end
if (spi_clk == 1'b1) begin
spi_mosi <= spi_addr_reg[7];
spi_addr_reg <= spi_addr_reg << 1;
if (spi_addr_reg == 0) begin
state <= LEN;
end
end
end
LEN: begin
if (spi_cs == 1'b0) begin
spi_mosi <= spi_len_reg[7];
spi_len_reg <= spi_len_reg << 1;
end
if (spi_clk == 1'b1) begin
spi_mosi <= spi_len_reg[7];
spi_len_reg <= spi_len_reg << 1;
if (spi_len_reg == 0) begin
if (intcfg_reg[0]) begin
state <= DATA;
end else begin
state <= IDLE;
spi_data_out_reg <= 0;
end
end
end
end
DATA: begin
if (spi_cs == 1'b0) begin
spi_mosi <= spi_data[spi_data_index][7];
spi_data[spi_data_index] <= spi_data[spi_data_index] << 1;
end
if (spi_clk == 1'b1) begin
spi_mosi <= spi_data[spi_data_index][7];
spi_data[spi_data_index] <= spi_data[spi_data_index] << 1;
spi_data_index <= spi_data_index + 1;
if (spi_data_index == spi_len_reg) begin
state <= IDLE;
spi_data_out_reg <= spi_data[spi_data_index];
spi_data_index <= 0;
end
end
end
endcase
end
end
// Output data to SPI master
assign spi_data_out = spi_data_out_reg;
// Input data from SPI master
always @ (posedge clk) begin
if (spi_cs == 1'b0 && spi_clk == 1'b0) begin
spi_data_in_reg <= spi_miso;
end
end
endmodule
```
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