[问答]

关于串口通信程序的纠错问题，TXD灯常亮，数码管只显示00

7043

问答对人有帮助，内容完整，我也想知道答案 0 串口接收完数据利用数码管显示出来，并将接收到的数据发回给pc，每次只发送或接收一帧数据，显示最多用两个数码管，可是数码管只显示00，且无法将接收到的数据发送回去，程序挺简单，有人能帮忙看看程序的错误么？？以下是接收模块 module usart_rx ( clk,rst_n,clk_bps,start_rx,rs232_in,bps_start,rx_data,rx_finish ); input clk; input clk_bps; input rst_n; input start_rx; input rs232_in; output bps_start; output[7:0]rx_data; output rx_finish; reg[3:0]count; reg bps_start_r; reg rx_finish; reg[7:0]rx_data_r; always@(posedge clk or negedge rst_n) if(!rst_n) begin count<=4'd0; bps_start_r<=1'b0; rx_finish<=1'b0; rx_data_r<=8'd0; end else case(count) 4'd0:if(start_rx)begin bps_start_r<=1'b1;count<=count+1'b1;end 4'd1:if(clk_bps)begin count<=count+1'b1;end 4'd2:if(clk_bps)begin rx_data_r[0]<=rs232_in;count<=count+1'b1;end 4'd3:if(clk_bps)begin rx_data_r[1]<=rs232_in;count<=count+1'b1;end 4'd4:if(clk_bps)begin rx_data_r[2]<=rs232_in;count<=count+1'b1;end 4'd5:if(clk_bps)begin rx_data_r[3]<=rs232_in;count<=count+1'b1;end 4'd6:if(clk_bps)begin rx_data_r[4]<=rs232_in;count<=count+1'b1;end 4'd7:if(clk_bps)begin rx_data_r[5]<=rs232_in;count<=count+1'b1;end 4'd8:if(clk_bps)begin rx_data_r[6]<=rs232_in;count<=count+1'b1;end 4'd9:if(clk_bps)begin rx_data_r[7]<=rs232_in;count<=count+1'b1;end 4'd10:if(clk_bps)count<=count+1'b1; 4'd11:if(clk_bps)count<=count+1'b1; 4'd12:begin bps_start_r<=1'b0;count<=count+1'b1;end 4'd13:begin rx_finish<=1'b1;count<=1'd0;end default:; endcase assign bps_start=bps_start_r; assign rx_data=rx_data_r; endmodule 以下是发送模块 module usart_tx ( clk,rst_n,clk_bps,rx_data,rx_finish,rs232_out,bps_start ); input clk; input rst_n; input rx_finish; input clk_bps; input[7:0] rx_data; output rs232_out; output bps_start; reg[7:0]tx_data; reg[3:0]count1; reg bps_start_r; reg start_tx; reg rs232_out_r; always@(posedge clk or negedge rst_n) if(!rst_n) begin count1<=4'd0; start_tx<=1'b0; bps_start_r<=1'b0; tx_data<=8'd0; end else if(rx_finish) begin start_tx<=1'b1; bps_start_r<=1'b1; tx_data<=rx_data; end else case(count1) 4'd0:if(clk_bps)begin rs232_out_r<=1'b0;count1<=count1+1'b1;end 4'd1:if(clk_bps)begin rs232_out_r<=tx_data[0];count1<=count1+1'b1;end 4'd2:if(clk_bps)begin rs232_out_r<=tx_data[1];count1<=count1+1'b1;end 4'd3:if(clk_bps)begin rs232_out_r<=tx_data[2];count1<=count1+1'b1;end 4'd4:if(clk_bps)begin rs232_out_r<=tx_data[3];count1<=count1+1'b1;end 4'd5:if(clk_bps)begin rs232_out_r<=tx_data[4];count1<=count1+1'b1;end 4'd6:if(clk_bps)begin rs232_out_r<=tx_data[5];count1<=count1+1'b1;end 4'd7:if(clk_bps)begin rs232_out_r<=tx_data[6];count1<=count1+1'b1;end 4'd8:if(clk_bps)begin rs232_out_r<=tx_data[7];count1<=count1+1'b1;end 4'd9:if(clk_bps)begin rs232_out_r<=1'b1;count1<=count1+1'b1;end 4'd10:if(clk_bps)begin rs232_out_r<=1'b1;count1<=count1+1'b1;end 4'd11:begin bps_start_r<=1'b0;count1<=count1+1'b1;end 4'd12:begin start_tx<=1'b0;count1<=1'd0;end default:; endcase assign bps_start=bps_start_r; assign rs232_out=rs232_out_r; endmodule 下面是数码管显示部分 module dispay_rx ( clk,rst_n,rx_finish,rx_data,seg_data,scan_sig ); input clk; input rst_n; input rx_finish; input[7:0]rx_data; output[7:0]seg_data; output[5:0]scan_sig; parameter T1MS = 16'd49999; reg[15:0]cnt1; reg[1:0]i1; reg[3:0]number; reg[1:0]i2; reg[5:0]scan_sig_r; always@(posedge clk or negedge rst_n) if(!rst_n ) cnt1 <= 16'd0; else if(cnt1==T1MS) cnt1<=16'd0; else if(rx_finish) cnt1<=cnt1+1'b1; always@(posedge clk or negedge rst_n) if(!rst_n) begin i1<=1'b0; number<=1'd0; end else if(rx_finish) case(i1) 1'b0:if(cnt1==T1MS)i1<=i1+1'b1;else number<=rx_data[7:4]; 1'b1:if(cnt1==T1MS)i1<=1'b0;else number<=rx_data[3:0]; default:; endcase parameter _0 = 8'b1100_0000, _1 = 8'b1111_1001, _2 = 8'b1010_0100, _3 = 8'b1011_0000, _4 = 8'b1001_1001, _5 = 8'b1001_0010, _6 = 8'b1000_0010, _7 = 8'b1111_1000, _8 = 8'b1000_0000, _9 = 8'b1001_0000, _10= 8'b1000_1000, _11= 8'b1000_0011, _12= 8'b1100_1110, _13= 8'b1010_0001, _14= 8'b1000_0110, _15= 8'b1000_1110; reg[7:0]seg_data_r; always@(posedge clk or negedge rst_n) if(!rst_n) seg_data_r<=8'b11111111; else if(rx_finish) case(number) 4'd0:seg_data_r<=_0; 4'd1:seg_data_r<=_1; 4'd2:seg_data_r<=_2; 4'd3:seg_data_r<=_3; 4'd4:seg_data_r<=_4; 4'd5:seg_data_r<=_5; 4'd6:seg_data_r<=_6; 4'd7:seg_data_r<=_7; 4'd8:seg_data_r<=_8; 4'd9:seg_data_r<=_9; 4'd10:seg_data_r<=_10; 4'd11:seg_data_r<=_11; 4'd12:seg_data_r<=_12; 4'd13:seg_data_r<=_13; 4'd14:seg_data_r<=_14; 4'd15:seg_data_r<=_15; default:; endcase assign seg_data=seg_data_r; always@(posedge clk or negedge rst_n) if(!rst_n) begin i2<=1'b0; scan_sig_r<=6'b100_000; end else if(rx_finish) case(i2) 1'b0:if(cnt1==T1MS)i2<=i2+1'b1;else scan_sig_r<=6'b111_101; 1'b1:if(cnt1==T1MS)i2<=1'b0;else scan_sig_r<=6'b111_110; default:; endcase assign scan_sig=scan_sig_r; endmodule 我用的板子是cyclone4的ep4c 0
2015-8-27 17:55:54　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × 刘英该类别下有 31 个回答。邀请回答 chenbingjy 该类别下有 27 个回答。邀请回答 yoonssica 该类别下有 22 个回答。邀请回答 houxiaoxiao 该类别下有 17 个回答。邀请回答小萃米该类别下有 16 个回答。邀请回答小工兵该类别下有 16 个回答。邀请回答 Elecfans管家该类别下有 15 个回答。邀请回答薄迪该类别下有 14 个回答。邀请回答我爱妖妖该类别下有 14 个回答。邀请回答言尽于此33 该类别下有 14 个回答。邀请回答 hxing 该类别下有 13 个回答。邀请回答那些年儿ing 该类别下有 13 个回答。邀请回答平漂流该类别下有 13 个回答。邀请回答 xiekaboy 该类别下有 12 个回答。邀请回答 1653344032.827400 该类别下有 12 个回答。邀请回答小麦地该类别下有 12 个回答。邀请回答科比如我该类别下有 12 个回答。邀请回答倪love 该类别下有 12 个回答。邀请回答 2013crazy 该类别下有 11 个回答。邀请回答英雄孤寂该类别下有 11 个回答。邀请回答举报不见不散4797 相关推荐 • char seconds=40；这条语句有什么作用？为什么交通灯中的数码管只显示0~20？ 943 • 如何通过串口通信发送“K+22”，而在数码管上只显示22？ 1969 • 一个简单的数码管改LED灯珠显示的电路问题？ 3473 • LED灯与数码管还有矩阵灯在同一个IO口，并且同时亮如何关闭？ 407 • 万用板上数码管显示问题 6021 • 求问一个简单的51数码管代码编写问题，急急急 1023 • 数码管的显示原理是什么 2890 • 数码管坏了 4571 • 数码管和按键 4351 • 仿真动态数码管可以亮，但静态数码管不亮，不知啥问题？ 5234 1个回答

答案对人有帮助，有参考价值 0 数码管程序没有问题，问题应该主要出在串口接收数据上，大家帮忙看看，我是新手

2015-8-28 13:25:20 评论举报不见不散4797