利用uart串口发送模块对uart串口接收模块进行仿真验证

前言

uart的发送和接收已经告一段落。在数字世界中，传输的就是0和1，所以串口通信这种传输方式是非常常见的，看来也需要了解I2C和SPI。

00.串口发送模块

详见uart串口发送模块功能实现及仿真

01.串口接收模块

详见uart串口接收模块实现、并完成led板级测试

02.串口接收模块仿真

`timescale 1ns/1ns
`define clock_period 20

module uart_byte_rx_tb;

	reg 			Clk				;
	reg 			Rst_n			;
	reg 			send_en			;
	reg 	[2:0]	baud_set		;
	reg 	[7:0]	data_byte		;

	wire			rs232_tx		;
	wire			tx_done			;
	wire 			tx_state		;
	wire 	[7:0]	data_byte_r		;
	
	wire rx_done;
	
	uart_byte_rx uart_byte_rx_inst(
		.Clk		(Clk		),
		.Rst_n		(Rst_n		),
		.rs232_rx	(rs232_tx	),
		.baud_set	(baud_set	),
		       
		.data_byte	(data_byte_r),
		.rx_done	(rx_done	)	
);
	

	uart_byte_tx  uart_byte_tx_inst(
		.Clk		(Clk		),
		.Rst_n		(Rst_n		),
		.send_en	(send_en	),
		.baud_set	(baud_set	),
		.data_byte	(data_byte	),
	                
		.rs232_tx	(rs232_tx	),
		.tx_done	(tx_done	),
		.tx_state	(tx_state	)

	);

	//产生时钟
	initial  Clk = 1'b1;
	always #(`clock_period/2) Clk = ~Clk;

	//产生激励信号
	initial begin
		Rst_n = 1'b0;
		data_byte = 8'b0;
		send_en = 1'b0;
		baud_set = 3'd0;
		#(`clock_period*20 + 1);
		Rst_n = 1'b1;
		
		
		#(`clock_period*50);
		data_byte = 8'haa;
		send_en = 1'd1;
		#`clock_period;
		send_en = 1'd0;
		@(posedge rx_done);
		
		
		#(`clock_period*5000);
		data_byte = 8'h55;
		send_en = 1'd1;
		#`clock_period;
		send_en = 1'd0;
		@(posedge rx_done);
		
		
		#(`clock_period*5000);
		data_byte = 8'hdc;
		send_en = 1'd1;
		#`clock_period;
		send_en = 1'd0;
		@(posedge rx_done);
		
		#(`clock_period*5000);
		data_byte = 8'hcd;
		send_en = 1'd1;
		#`clock_period;
		send_en = 1'd0;
		@(posedge rx_done);
		
		#(`clock_period*5000);
		$stop;	
	end

endmodule

03.功能仿真如下

后记

后面打算做一个较为复杂的uart回环测试。