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🎉欢迎来到FPGA专栏~搭建串口收发与储存双口RAM系统

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一、效果演示

🥝输入数据：

🥝输出数据：

🥝串口助手分析：

按下第一次按键，FPGA开始连续发送数据，按下第二次按键，FPGA停止发送数据。

二、基础知识

2.1 实现目标

使用按键消抖、串口发送与接收模块，以及双端口RAM模块实现串口发送数据到FPGA中，FPGA接收到数据后将数据存储在双口RAM中，当按下按键时FPGA将RAM中存储的数据再通过串口发送出去，再次按下按键后，FPGA停止发送数据。

2.2 所需基础模块

相关模块学习文章：
🥝【FPGA零基础学习之旅#10】按键消抖模块设计与验证（一段式状态机实现）；
🥝【FPGA零基础学习之旅#13】串口发送模块设计与验证；
🥝【FPGA零基础学习之旅#14】串口发送字符串；
🥝【FPGA零基础学习之旅#15】串口接收模块设计与验证（工业环境）；
🥝【FPGA零基础学习之旅#16】嵌入式块RAM-双口ram的使用。

三、系统分析

参考小梅哥FPGA设计的系统框图：

通过串口发送数据到FPGA中，FPGA接收到数据后将数据存储在双口RAM的一段连续空间中。当需要时，按下按键S0，则FPGA将RAM中存储的数据通过串口发送出去；再次按下S0，则停止数据发送。

进行功能划分：串口接收模块、按键消抖模块、RAM模块、串口发送模块以及控制模块。

在此给出所需使用的模块代码：

按键消抖模块：

//
//模块：按键消抖模块
//key_state：输出消抖之后按键的状态
//key_flag：按键消抖结束时产生一个时钟周期的高电平脉冲
//
module KeyFilter(input 		Clk,input 		Rst_n,input 		key_in,output reg 	key_flag,output reg 	key_state
);//按键的四个状态localparamIDLE 		= 4'b0001,FILTER1 	= 4'b0010,DOWN 		= 4'b0100,FILTER2 	= 4'b1000;//状态寄存器reg [3:0] curr_st;//边沿检测输出上升沿或下降沿wire pedge;wire nedge;//计数寄存器reg [19:0]cnt;//使能计数寄存器reg en_cnt;//计数满标志信号reg cnt_full;//计数满寄存器//------<边沿检测电路的实现>------//边沿检测电路寄存器reg key_tmp0;reg key_tmp1;//边沿检测always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)beginkey_tmp0 <= 1'b0;key_tmp1 <= 1'b0;endelse beginkey_tmp0 <= key_in;key_tmp1 <= key_tmp0;end	endassign nedge = (!key_tmp0) & (key_tmp1);assign pedge = (key_tmp0)  & (!key_tmp1);//------<状态机主程序>------	//状态机主程序always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)begincurr_st <= IDLE;en_cnt <= 1'b0;key_flag <= 1'b0;key_state <= 1'b1;endelse begincase(curr_st)IDLE:beginkey_flag <= 1'b0;if(nedge)begincurr_st <= FILTER1;en_cnt <= 1'b1;endelsecurr_st <= IDLE;endFILTER1:beginif(cnt_full)beginkey_flag <= 1'b1;key_state <= 1'b0;curr_st <= DOWN;en_cnt <= 1'b0;end	else if(pedge)begincurr_st <= IDLE;en_cnt <= 1'b0;endelsecurr_st <= FILTER1;endDOWN:beginkey_flag <= 1'b0;if(pedge)begincurr_st <= FILTER2;en_cnt <= 1'b1;endelsecurr_st <= DOWN;endFILTER2:beginif(cnt_full)beginkey_flag <= 1'b1;key_state <= 1'b1;curr_st <= IDLE;en_cnt <= 1'b0;end	else if(nedge)begincurr_st <= DOWN;en_cnt <= 1'b0;endelsecurr_st <= FILTER2;enddefault:begincurr_st <= IDLE;en_cnt <= 1'b0;key_flag <= 1'b0;key_state <= 1'b1;endendcaseendend//------<20ms计数器>------		//20ms计数器//Clk 50_000_000Hz//一个时钟周期为20ns//需要计数20_000_000 / 20 = 1_000_000次always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)cnt <= 20'd0;else if(en_cnt)cnt <= cnt + 1'b1;elsecnt <= 20'd0;endalways@(posedge Clk or negedge Rst_n)beginif(!Rst_n)cnt_full <= 1'b0;else if(cnt == 999_999)cnt_full <= 1'b1;elsecnt_full <= 1'b0;endendmodule

串口接收模块：

//
//模块名称：串口接收模块（工业环境）
//
module uart_byte_rx(input 					Clk,//50Minput 					Rst_n,input 			[2:0]	baud_set,input 					data_rx,output 	reg 	[7:0]	data_byte,output 	reg			Rx_Done
);reg s0_Rx,s1_Rx;//同步寄存器reg tmp0_Rx,tmp1_Rx;//数据寄存器reg [15:0]bps_DR;//分频计数器计数最大值reg [15:0]div_cnt;//分频计数器reg bps_clk;//波特率时钟reg [7:0]bps_cnt;reg uart_state;reg [2:0] r_data_byte [7:0];reg [2:0]START_BIT;reg [2:0]STOP_BIT;wire nedge;//--------<同步寄存器处理>--------		
//用于消除亚稳态always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)begins0_Rx <= 1'b0;s1_Rx <= 1'b0;endelse begins0_Rx <= data_rx;s1_Rx <= s0_Rx;endend//--------<数据寄存器处理>--------		always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)begintmp0_Rx <= 1'b0;tmp1_Rx <= 1'b0;endelse begintmp0_Rx <= s1_Rx;tmp1_Rx <= tmp0_Rx;endend//--------<下降沿检测>--------	assign nedge = !tmp0_Rx & tmp1_Rx;//--------<div_cnt模块>--------	
//得到不同计数周期的计数器always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)div_cnt <= 16'd0;else if(uart_state)beginif(div_cnt == bps_DR)div_cnt <= 16'd0;elsediv_cnt <= div_cnt + 1'b1;endelsediv_cnt <= 16'd0;end
//--------<bps_clk信号的产生>--------	always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)bps_clk <= 1'b0;else if(div_cnt == 16'd1)bps_clk <= 1'b1;elsebps_clk <= 1'b0;end//--------<bps_clk计数模块>--------		always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)bps_cnt <= 8'd0;else if(bps_cnt == 8'd159 || (bps_cnt == 8'd12 && (START_BIT > 2)))bps_cnt <= 8'd0;else if(bps_clk)bps_cnt <= bps_cnt + 1'b1;elsebps_cnt <= bps_cnt;end//--------<Rx_Done模块>--------	always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)Rx_Done <= 1'b0;else if(bps_cnt == 8'd159)Rx_Done <= 1'b1;elseRx_Done <= 1'b0;end	//--------<波特率查找表>--------		always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)bps_DR <= 16'd324;else begincase(baud_set)0:bps_DR <= 16'd324;1:bps_DR <= 16'd162;2:bps_DR <= 16'd80;3:bps_DR <= 16'd53;4:bps_DR <= 16'd26;default:bps_DR <= 16'd324;endcaseend	end//--------<采样数据接收模块>--------	always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)beginSTART_BIT <= 3'd0;r_data_byte[0] <= 3'd0; r_data_byte[1] <= 3'd0;r_data_byte[2] <= 3'd0; r_data_byte[3] <= 3'd0;r_data_byte[4] <= 3'd0; r_data_byte[5] <= 3'd0;r_data_byte[6] <= 3'd0; r_data_byte[7] <= 3'd0;STOP_BIT <= 3'd0;endelse if(bps_clk)begincase(bps_cnt)0:beginSTART_BIT <= 3'd0;r_data_byte[0] <= 3'd0;r_data_byte[1] <= 3'd0;r_data_byte[2] <= 3'd0;r_data_byte[3] <= 3'd0;r_data_byte[4] <= 3'd0;r_data_byte[5] <= 3'd0;r_data_byte[6] <= 3'd0;r_data_byte[7] <= 3'd0;STOP_BIT <= 3'd0; end6,7,8,9,10,11:START_BIT <= START_BIT + s1_Rx;22,23,24,25,26,27:r_data_byte[0] <= r_data_byte[0] + s1_Rx;38,39,40,41,42,43:r_data_byte[1] <= r_data_byte[1] + s1_Rx;54,55,56,57,58,59:r_data_byte[2] <= r_data_byte[2] + s1_Rx;70,71,72,73,74,75:r_data_byte[3] <= r_data_byte[3] + s1_Rx;86,87,88,89,90,91:r_data_byte[4] <= r_data_byte[4] + s1_Rx;102,103,104,105,106,107:r_data_byte[5] <= r_data_byte[5] + s1_Rx;118,119,120,121,122,123:r_data_byte[6] <= r_data_byte[6] + s1_Rx;134,135,136,137,138,139:r_data_byte[7] <= r_data_byte[7] + s1_Rx;150,151,152,153,154,155:STOP_BIT <= STOP_BIT + s1_Rx;default:beginSTART_BIT <= START_BIT;r_data_byte[0] <= r_data_byte[0];r_data_byte[1] <= r_data_byte[1];r_data_byte[2] <= r_data_byte[2];r_data_byte[3] <= r_data_byte[3];r_data_byte[4] <= r_data_byte[4];r_data_byte[5] <= r_data_byte[5];r_data_byte[6] <= r_data_byte[6];r_data_byte[7] <= r_data_byte[7];STOP_BIT <= STOP_BIT;endendcaseendend//--------<数据状态判定模块>--------	always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)data_byte <= 8'd0;else if(bps_cnt == 8'd159)begindata_byte[0] <= r_data_byte[0][2];data_byte[1] <= r_data_byte[1][2];data_byte[2] <= r_data_byte[2][2];data_byte[3] <= r_data_byte[3][2];data_byte[4] <= r_data_byte[4][2];data_byte[5] <= r_data_byte[5][2];data_byte[6] <= r_data_byte[6][2];data_byte[7] <= r_data_byte[7][2];endelse;end//--------<uart_state模块>--------	always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)uart_state <= 1'b0;else if(nedge)uart_state <= 1'b1;else if(Rx_Done || (bps_cnt == 8'd12 && (START_BIT > 2)))uart_state <= 1'b0;elseuart_state <= uart_state;endendmodule

串口发送模块：

//
//模块名称：串口发送模块
//
module uart_byte_tx(input 		Clk,input 		Rst_n,input [7:0]	data_byte,input 		send_en,input [2:0]	baud_set,output reg uart_tx,output reg Tx_Done,output reg uart_state
);reg bps_clk;//波特率时钟reg [15:0]div_cnt;//分频计数器reg [15:0]bps_DR;//分频计数最大值reg [3:0]bps_cnt;//波特率计数时钟//定义数据的起始位和停止位localparam START_BIT = 1'b0;localparam STOP_BIT  = 1'b1;reg [7:0]r_data_byte;//数据寄存器//--------<uart状态模块>--------	always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)uart_state <= 1'b0;else if(send_en)uart_state <= 1'b1;else if(bps_cnt == 4'd11)//bps_cnt计数达到11次，即发送结束uart_state <= 1'b0;elseuart_state <= uart_state;end//--------<使能分频计数模块>-------	
//	assign en_cnt = uart_state;//--------<寄存待发送的数据，使数据保持稳定>--------always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)r_data_byte <= 8'd0;else if(send_en)r_data_byte <= data_byte;elser_data_byte <= r_data_byte;end//--------<波特率查找表>--------		always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)bps_DR <= 16'd5207;else begincase(baud_set)0:bps_DR <= 16'd5207;1:bps_DR <= 16'd2603;2:bps_DR <= 16'd1301;3:bps_DR <= 16'd867;4:bps_DR <= 16'd433;default:bps_DR <= 16'd5207;endcaseend	end//--------<Div_Cnt模块>--------	
//得到不同计数周期的计数器always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)div_cnt <= 16'd0;else if(uart_state)begin	//	assign en_cnt = uart_state;if(div_cnt == bps_DR)div_cnt <= 16'd0;elsediv_cnt <= div_cnt + 1'b1;endelsediv_cnt <= 16'd0;end
//--------<bps_clk信号的产生>--------	always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)bps_clk <= 1'b0;else if(div_cnt == 16'd1)bps_clk <= 1'b1;elsebps_clk <= 1'b0;end//--------<bps_cnt计数模块>--------		always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)bps_cnt <= 4'd0;else if(bps_cnt == 4'd11)//clr信号bps_cnt <= 4'd0;else if(bps_clk)bps_cnt <= bps_cnt + 1'b1;elsebps_cnt <= bps_cnt;end//--------<Tx_Done模块>--------	always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)Tx_Done <= 1'b0;else if(bps_cnt == 4'd11)Tx_Done <= 1'b1;elseTx_Done <= 1'b0;end//--------<数据位输出模块-10选1多路器>--------	always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)uart_tx <= 1'b1;else begincase(bps_cnt)0:uart_tx <= 1'b1;1:uart_tx <= START_BIT;2:uart_tx <= r_data_byte[0];3:uart_tx <= r_data_byte[1];4:uart_tx <= r_data_byte[2];5:uart_tx <= r_data_byte[3];6:uart_tx <= r_data_byte[4];7:uart_tx <= r_data_byte[5];8:uart_tx <= r_data_byte[6];9:uart_tx <= r_data_byte[7];10:uart_tx <= STOP_BIT;default:uart_tx <= 1'b1;endcaseendendendmodule

四、代码编写

上述已给出按键消抖模块和串口收发模块，在本文中主要编写控制模块和顶层模块。

4.1 控制模块

为了实现FPGA将接收到的数据存储到双口RAM的一段连续空间中，就需要设计一个可以实现写地址数据自加的控制逻辑，且其控制信号为串口接收模块输出的Rx_Done信号。每来一个Rx_Done就表明接收成功一字节数，地址数进行加一：

assign wren = Rx_Done;always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)wraddress <= 8'd0;else if(Rx_Done)wraddress <= wraddress + 1'b1;elsewraddress <= wraddress;
end

当按下按键S0，FPGA将RAM中存储的数据通过串口发送出去。需要实现按键按下即启动连续读操作，再次按下可暂停读操作：

reg do_send;always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)do_send <= 1'd0;else if(Key_flag && !Key_state)do_send <= ~do_send;
endalways@(posedge Clk or negedge Rst_n)beginif(!Rst_n) rdaddress <= 8'd0;else if(do_send && Tx_Done)rdaddress <= rdaddress + 8'd1;elserdaddress <= rdaddress;
end

在仿真双端口RAM时发现其输出会延迟两个系统时钟周期。这是为了保证数据变化稳定之后才进行数据输出，所以在此将驱动Send_en的信号接两级寄存器进行延迟两拍。当按键按下后启动一次发送，然后判断上一字节是否发送结束，是则进行下一字节发送否则不进行下一次发送：

reg r0_send_done,r1_send_done;always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)beginr0_send_done <= 1'b0;r1_send_done <= 1'b0;endelse beginr0_send_done <= (do_send && Tx_Done);r1_send_done <= r0_send_done; end
endalways@(posedge Clk or negedge Rst_n)beginif(!Rst_n)Send_en <= 1'b0;else if(Key_flag && !Key_state)Send_en <= 1'b1;else if(r1_send_done)Send_en <= 1'b1;elseSend_en <= 1'b0;
end

为了保证RAM地址操作的有效性，在写地址和读地址代码部分加上范围限制：

//--------<dpram写地址加1>--------	
always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)wraddress <= 8'd0;else if(Rx_Done)wraddress <= wraddress + 1'b1;else if(wraddress > 8'd255) //当写地址大于配置ip核时的值时，返回到0地址；wraddress <= 8'd0;elsewraddress <= wraddress;
end//--------<dpram读地址加1>--------		
always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)rdaddress <= 8'd0;else if(do_send && Tx_Done)rdaddress <= rdaddress + 8'd1;else if(rdaddress > 8'd255)	//当读地址大于255时，返回到0地址；rdaddress <= 8'd0;elserdaddress <= rdaddress;
end

完整的控制模块代码：system_ctrl.v

module system_ctrl(input 				Clk,input 				Rst_n,input 				Key_flag,input 				Key_state,input 				Rx_Done,input 				Tx_Done,output 				wren,output reg			Send_en,output reg [7:0]	rdaddress,output reg [7:0]	wraddress
);assign wren = Rx_Done;reg do_send;reg r0_send_done;reg r1_send_done;//--------<dpram写地址加1>--------	always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)wraddress <= 8'd0;else if(Rx_Done)wraddress <= wraddress + 1'b1;else if(wraddress > 8'd255) //当写地址大于配置ip核时的值时，返回到0地址；wraddress <= 8'd0;elsewraddress <= wraddress;end//--------<翻转标志信号>--------
//按下一次按键开始连续发送数据，再按一次按键停止发送;always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)do_send <= 1'b0;else if(Key_flag && !Key_state)do_send <= ~do_send;end//--------<dpram读地址加1>--------		always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)rdaddress <= 8'd0;else if(do_send && Tx_Done)rdaddress <= rdaddress + 8'd1;else if(rdaddress > 8'd255)	//当读地址大于255时，返回到0地址；rdaddress <= 8'd0;elserdaddress <= rdaddress;end//--------<RAM的两拍延迟>--------	
//双端口RAM的输出延迟两个系统时钟周期;always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)beginr0_send_done <= 1'b0;r1_send_done <= 1'b1;endelse beginr0_send_done <= (do_send && Tx_Done);r1_send_done <= r0_send_done;endend//--------<按键控制与连续读操作>--------	
//Send_en由按键信号和r1_send_done信号同时控制;
//r1_send_done信号使得串口连续读取dpram的数据;always@(posedge Clk or negedge Rst_n)beginif(!Rst_n)Send_en <= 1'b0;else if(Key_flag && !Key_state)Send_en <= 1'b1;else if(r1_send_done)Send_en <= 1'b1;elseSend_en <= 1'b0;endendmodule

控制模块的RTL视图：

4.2 顶层模块

将串口接收模块、按键消抖模块、RAM模块、串口发送模块以及控制模块例化到顶层模块中。

uart_system_top.v：

module uart_system_top(input 	Clk,input 	Rst_n,input		key_in,input 	uart_rx,output 	uart_tx
);wire [7:0]rx_data;wire [7:0]tx_data;wire Key_flag;wire Key_state;wire Rx_Done;wire Tx_Done;wire wren;wire Send_en;wire [7:0]rdaddress;wire [7:0]wraddress;uart_byte_rx uart_byte_rx(.Clk(Clk),.Rst_n(Rst_n),.baud_set(3'd0),.data_rx(uart_rx),.data_byte(rx_data),.Rx_Done(Rx_Done));dpram dpram(.clock(Clk),.data(rx_data),.rdaddress(rdaddress),.wraddress(wraddress),.wren(wren),.q(tx_data));KeyFilter KeyFilter(.Clk(Clk),.Rst_n(Rst_n),.key_in(key_in),.key_flag(Key_flag),.key_state(Key_state));uart_byte_tx uart_byte_tx(.Clk(Clk),.Rst_n(Rst_n),.data_byte(tx_data),.send_en(Send_en),.baud_set(3'd0),.uart_tx(uart_tx),.Tx_Done(Tx_Done),.uart_state());system_ctrl system_ctrl(.Clk(Clk),.Rst_n(Rst_n),.Key_flag(Key_flag),.Key_state(Key_state),.Rx_Done(Rx_Done),.Tx_Done(Tx_Done),.wren(wren),.Send_en(Send_en),.rdaddress(rdaddress),.wraddress(wraddress));endmodule

顶层模块的RTL视图：

五、仿真测试激励文件

5.1 key_model

key_model仿真模型用于有按键控制信号的项目进行仿真测试，模拟实际情况中的按键抖动。 在仿真时将该模型也添加到工程中使用。

key_model.v：

`timescale 1ns/1nsmodule key_model(press,key);input press;output reg key;reg [15:0]myrand;initial beginkey = 1'b1;		endalways@(posedge press)press_key;task press_key;beginrepeat(50)beginmyrand = {$random}%65536;//0~65535;#myrand key = ~key;			endkey = 0;#25000000;repeat(50)beginmyrand = {$random}%65536;//0~65535;#myrand key = ~key;			endkey = 1;#25000000;		end	endtaskendmodule

5.2 testbench编写

完整的仿真测试激励文件：

uart_system_top_tb.v：

`timescale 1ns/1ns
`define clock_period 20module uart_system_top_tb;reg Clk;reg Rst_n;wire Key_in;wire uart_rx;wire uart_tx;reg [7:0]data_byte_t;reg send_en;wire [2:0]baud_set;wire Tx_Done;reg press;assign baud_set = 3'd0;uart_system_top uart_system_top(.Clk(Clk),.Rst_n(Rst_n),.key_in(Key_in),.uart_rx(uart_tx),.uart_tx(uart_rx));uart_byte_tx uart_byte_tx(.Clk(Clk),.Rst_n(Rst_n),.data_byte(data_byte_t),.send_en(send_en),.baud_set(baud_set),.uart_tx(uart_tx),.Tx_Done(Tx_Done),.uart_state());key_model key_model(.press(press),.key(Key_in));initial Clk = 1;always#(`clock_period / 2) Clk = ~Clk;initial beginRst_n = 1'b0;press = 0;data_byte_t = 8'd0;send_en = 1'd0;#(`clock_period*20 + 1 );Rst_n = 1'b1;#(`clock_period*50);data_byte_t = 8'haa;send_en = 1'd1;#`clock_period;send_en = 1'd0;		@(posedge Tx_Done)#(`clock_period*5000);data_byte_t = 8'h55;send_en = 1'd1;#`clock_period;send_en = 1'd0;@(posedge Tx_Done)#(`clock_period*5000);data_byte_t = 8'h33;send_en = 1'd1;#`clock_period;send_en = 1'd0;		@(posedge Tx_Done)#(`clock_period*5000);data_byte_t = 8'haf;send_en = 1'd1;#`clock_period;send_en = 1'd0;@(posedge Tx_Done)#(`clock_period*5000);press = 1;#(`clock_period*3)press = 0;#(`clock_period*2000000)$stop;endendmodule

5.3 仿真结果

六、板级验证

🥝输入数据储存到双口RAM中：

🥝输出RAM中的数据：

🧸结尾

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