串口轉axi主機總線介面

uart2axi_master_intf程式原始碼：

/***************************************************
*	Module Name		:	uart2axi_master_intf	   
*	Engineer		:	Huangruigui
*	Target Device	:	
*	Tool versions	:	
*	Create Date		:
*	Revision		:	v1.0
*	Description		:  
**************************************************/
module	uart2axi_master_intf #(
	parameter 	M_AXI_ADDR_WIDTH 			= 8'd32,
	parameter	M_AXI_DATA_WIDTH 			= 8'd32,
	parameter	RX_TOTAL_BYTE	 			= 8'd9,				//	串口接收到9byte資料開始作業	
	parameter	TX_TOTAL_BYTE				= 8'd4				//	串口發送4byte資料給上位機
)(
	//	Global Clock Signal
	input	wire							m_axi_aclk,			//	模塊基準時鐘，100MHz
	input	wire							m_axi_aresetn,		//	模塊復位信號，低電平有效
	
	//	Master Write Addr Interface
	output	reg	 							m_axi_awvalid,
	input	wire							m_axi_awready,
	output	wire [M_AXI_ADDR_WIDTH-1:0]		m_axi_awaddr,	
	
	//	Master Write Date Interface
	output	reg	 							m_axi_wvalid,
	input	wire							m_axi_wready,
	output	wire [M_AXI_DATA_WIDTH-1:0]		m_axi_wdata,
	output	wire [M_AXI_DATA_WIDTH/8-1:0]	m_axi_wstrb,
	
	//	Master Read Addr Interface
	output	reg								m_axi_arvalid,
	input	wire 							m_axi_arready,
	output	wire [M_AXI_ADDR_WIDTH-1:0]		m_axi_araddr,
	
	//	Master Read Date Interface
	output	wire							m_axi_rready,
	input	wire							m_axi_rvalid,
	input	wire [M_AXI_DATA_WIDTH-1:0]		m_axi_rdata,
	input	wire [1:0]						m_axi_rresp,
	
	//	Master Response Interface
	output	reg								m_axi_bready,
	input	wire							m_axi_bvalid,
	input	wire [1:0]						m_axi_bresp,
	
	input	wire							uart_write,
	input	wire	[M_AXI_ADDR_WIDTH-1:0]	uart_write_addr,
	input	wire	[M_AXI_DATA_WIDTH-1:0]	uart_write_data,
	input	wire							uart_read,
	input	wire	[M_AXI_ADDR_WIDTH-1:0]	uart_read_addr,
	output	reg								uart_tx_en,
	output	reg		[M_AXI_DATA_WIDTH-1:0]	uart_tx_data
);
	
	//parameter define
	localparam	OKAY 	= 2'b00,
				EXOKAY 	= 2'b01,
				SLVERR 	= 2'b10,
				DECERR 	= 2'b11;
				
	assign	m_axi_wstrb 	= {(M_AXI_DATA_WIDTH/8){1'b1}};
	assign	m_axi_wdata 	= uart_write_data;
	assign	m_axi_awaddr 	= uart_write_addr;
	assign	m_axi_araddr 	= uart_read_addr;
	assign	m_axi_rready	= 1;
	
	always@(posedge m_axi_aclk or negedge m_axi_aresetn)
	begin
		if(!m_axi_aresetn)
			m_axi_bready <= 0;
		else if(m_axi_wvalid & m_axi_wready)
			m_axi_bready <= 1;
		else if(m_axi_bvalid & (m_axi_bresp == OKAY))
			m_axi_bready <= 0;
	end 
	
	always@(posedge m_axi_aclk or negedge m_axi_aresetn)
	begin
		if(!m_axi_aresetn)
			m_axi_awvalid <= 0;		
		else if(uart_write)
			m_axi_awvalid <= 1;
		else if(m_axi_awready)
			m_axi_awvalid  <= 0;
	end 
	
	always@(posedge m_axi_aclk or negedge m_axi_aresetn)
	begin
		if(!m_axi_aresetn)
			m_axi_wvalid <= 0;
		else if(m_axi_awvalid & m_axi_awready)
			m_axi_wvalid <= 1;
		else if(m_axi_wready)
			m_axi_wvalid <= 0;
	end 
	
	always@(posedge m_axi_aclk or negedge m_axi_aresetn)
	begin
		if(!m_axi_aresetn)
			m_axi_arvalid <= 0;
		else if(uart_read)
			m_axi_arvalid <= 1;
		else if(m_axi_arready)
			m_axi_arvalid <= 0;
	end 	
	
	always@(posedge m_axi_aclk or negedge m_axi_aresetn)
	begin
		if(!m_axi_aresetn)
		begin
			uart_tx_en <= 0;
			uart_tx_data <= 0;
		end 
		else if(m_axi_rvalid & m_axi_rready)
		begin
			uart_tx_en <= 1;
			uart_tx_data <= m_axi_rdata;
		end 
		else if(uart_write)
		begin
			uart_tx_en <= 1;
			uart_tx_data <= uart_write_data;		//	將寫資料發送回上位機作為回應
		end 
		else 
			uart_tx_en <= 0;
	end 
	
endmodule
//*****************檔案結束**************************

整個模塊測驗檔案

/***************************************************
*	Module Name		:	uart2axi_master_tb	   
*	Engineer		:	Huangruigui
*	Target Device	:	
*	Tool versions	:	
*	Create Date		:
*	Revision		:	v1.0
*	Description		:  
**************************************************/
`timescale 1ns/1ns
module	uart2axi_master_tb;

	//	parameter define
	parameter 	M_AXI_ADDR_WIDTH 		= 8'd32;
	parameter	M_AXI_DATA_WIDTH 		= 8'd32;
	parameter	BAUD_SET		 		= 16'd10416;		//	波特率設定，默認9600
	parameter	RX_TOTAL_BYTE	 		= 8'd9;				//	串口接收到9byte資料開始作業	
	parameter	TX_TOTAL_BYTE			= 8'd4;				//	串口發送4byte資料給上位機
	parameter	WRITE_BIT				= 5'd1;				//	設定最高位1為寫操作
	parameter	READ_BIT				= 5'd2;

	reg								sys_clk;
	reg								sys_rst_n;
	reg								tx_en;
	reg	[7:0]						tx_data;
	wire							tx_done	;
	wire							uart_tx	;
	
	wire 							m_axi_awvalid;
    reg								m_axi_awready;
    wire [M_AXI_ADDR_WIDTH-1:0]		m_axi_awaddr;	
    wire 							m_axi_wvalid;
    reg								m_axi_wready;
    wire [M_AXI_DATA_WIDTH-1:0]		m_axi_wdata;
    wire [M_AXI_DATA_WIDTH/8-1:0]	m_axi_wstrb;
    wire							m_axi_arvalid;
    reg	 							m_axi_arready;
    wire [M_AXI_ADDR_WIDTH-1:0]		m_axi_araddr;
    wire							m_axi_rready;
    reg								m_axi_rvalid;
    reg	 [M_AXI_DATA_WIDTH-1:0]		m_axi_rdata;
    reg [1:0]						m_axi_rresp;
    wire							m_axi_bready;
    reg								m_axi_bvalid;
	reg	 [1:0]						m_axi_bresp;


	initial sys_clk = 1;
	always #5 sys_clk = ~sys_clk;
	
	initial begin
		sys_rst_n = 0;
		tx_en = 0;
		tx_data = 0;
		m_axi_awready = 1;
		m_axi_wready = 1;
		m_axi_arready = 1;
		m_axi_rresp = 2'b00;
		m_axi_rvalid = 0;
		m_axi_rdata = 0;
		m_axi_bvalid = 1;
		m_axi_bresp = 2'b00;
		#201;
		sys_rst_n = 1;
		#20;
		@(posedge sys_clk)
		#100;
		tx_data = 0;				//	測驗寫操作
		repeat(9)
		begin
			tx_en = 1;
			tx_data = tx_data + 1;
			#10;
			tx_en = 0;
			wait(tx_done);
			#100;
		end 
		#100;
		if((m_axi_awaddr == 32'h02030405) & (m_axi_wdata == 32'h06070809))
			$display("test success");
		else
			$display("test fail");
		#1000;
		
		tx_data = 1;				//	測驗讀操作
		repeat(9)
		begin
			tx_en = 1;
			tx_data = tx_data + 1;
			#10;
			tx_en = 0;
			wait(tx_done);
			#100;
		end 
		if(m_axi_araddr == 32'h03040506)
			$display("test success");
		else
			$display("test fail");
		#100;
		
		m_axi_rvalid = 1;			//	測驗串口發送
		m_axi_rdata = 32'h12345678;
		#10;
		m_axi_rvalid = 0;	
		wait(uart2axi_master.uart2axi_master_logic.byte_matching.tx_conduct.uart_tx_done);
		#1000;
		
		$stop;
	end 

uart_tx_logic #(
	.BAUD_SET			(	BAUD_SET		)
)uart_tx_logic(	
	.sys_clk			(	sys_clk			),
	.sys_rst_n			(	sys_rst_n		),
	.tx_en				(	tx_en			),
	.tx_data			(	tx_data			),
	.tx_done			(	tx_done			),		
	.uart_tx			(	uart_tx			)
);

uart2axi_master #(
	.M_AXI_ADDR_WIDTH	(	M_AXI_ADDR_WIDTH),
	.M_AXI_DATA_WIDTH	(	M_AXI_DATA_WIDTH),
	.RX_TOTAL_BYTE		(	RX_TOTAL_BYTE	),
	.TX_TOTAL_BYTE		(	TX_TOTAL_BYTE	)
)uart2axi_master(
	.m_axi_aclk			(	sys_clk			),
	.m_axi_aresetn		(	sys_rst_n		),
	.m_axi_awvalid		(	m_axi_awvalid	),
	.m_axi_awready		(	m_axi_awready	),
	.m_axi_awaddr		(	m_axi_awaddr	),
	.m_axi_wvalid		(	m_axi_wvalid	),
	.m_axi_wready		(	m_axi_wready	),
	.m_axi_wdata		(	m_axi_wdata		),
	.m_axi_wstrb		(	m_axi_wstrb		),
	.m_axi_arvalid		(	m_axi_arvalid	),
	.m_axi_arready		(	m_axi_arready	),
	.m_axi_araddr		(	m_axi_araddr	),
	.m_axi_rready		(	m_axi_rready	),
	.m_axi_rvalid		(	m_axi_rvalid	),
	.m_axi_rdata		(	m_axi_rdata		),
	.m_axi_rresp		(	m_axi_rresp		),
	.m_axi_bready		(	m_axi_bready	),
	.m_axi_bvalid		(	m_axi_bvalid	),
	.m_axi_bresp		(	m_axi_bresp		),
	.UART_RX            (   uart_tx         ),
	.UART_TX            (   	        	)
);

endmodule
//*****************檔案結束*************************

結束啦，