关于串口通信程序的纠错问题，TXD灯常亮，数码管只显示00

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

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