串口发送程序
以下程序基于KC705开发板，以及猫猫串口网络调试助手验证通过。
1.串口发送
`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: // Engineer: chensimin // // Create Date: 2018/12/24 14:06:24 // Design Name: // Module Name: tx_funcmod_1 // Project Name: // Target Devices: // Tool Versions: // Description: // // Dependencies: // // Revision: // Revision 0.01 - File Created // Additional Comments: // ////////////////////////////////////////////////////////////////////////////////// module tx_funcmod_1 ( input wire clk, input wire rst, output reg txd, input wire enable, output reg done, input wire [7:0] data ); //---------------------------------------------------------------------------------- //50M Hz parameter B115K2 = 14'd10416 ; // formula : ( 1/115200 )/( 1/50E+6 ) //---------------------------------------------------------------------------------- reg enable_delay_1; reg enable_delay_2; always @ (posedge clk or posedge rst) begin if(rst) begin enable_delay_1 <= 1'b0; enable_delay_2 <= 1'b0; end else begin enable_delay_1 <= enable; enable_delay_2 <= enable_delay_1; end end //---------------------------------------------------------------------------------- assign rising = !enable_delay_2 && enable_delay_1; //---------------------------------------------------------------------------------- reg send_one_time; always @ (posedge clk or posedge rst) begin if(rst) send_one_time <= 1'b0; else if(rising) send_one_time <= 1'b1; else if(i == 13) send_one_time <= 1'b0; end //---------------------------------------------------------------------------------- reg [3:0] i; reg [13:0] C1; reg [10:0] D1; always @ (posedge clk or posedge rst) begin if(rst) begin i <= 4'd0 ; C1 <= 0 ; D1 <= 0 ; txd <= 1'b1 ; done <= 1'b0 ; end else if(send_one_time) begin case(i) 0: begin D1 <= {2'b11, data, 1'b0}; i <= i + 1'b1; end 1,2,3,4,5,6,7,8,9,10,11: begin if( C1 == B115K2 -1 ) begin C1 <= 8'd0; i <= i + 1'b1; end else begin txd <= D1[i-1]; C1 <= C1 + 1'b1; end end 12: begin done <= 1'b1; i <= i + 1'b1; end 13: begin done <= 1'b0; i <= 4'd0; end endcase end end //---------------------------------------------------------------------------------- ila_1 U10 ( .clk(clk), // input wire clk .probe0(send_one_time), // input wire [0:0] probe0 .probe1(rising), // input wire [0:0] probe1 .probe2(enable), // input wire [0:0] probe2 .probe3(enable_delay_1), // input wire [0:0] probe3 .probe4(enable_delay_2), // input wire [0:0] probe4 .probe5(i), // input wire [3:0] probe5 .probe6(done) // input wire [0:0] probe6 ); endmodule
2.串口接收
`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: // Engineer: chensimin // // Create Date: 2018/12/24 16:33:17 // Design Name: // Module Name: rx_funcmod_1 // Project Name: // Target Devices: // Tool Versions: // Description: // // Dependencies: // // Revision: // Revision 0.01 - File Created // Additional Comments: // ////////////////////////////////////////////////////////////////////////////////// module rx_funcmod_1 ( input wire clk, input wire rst, input wire rxd, input wire enable, output reg done, output wire [7:0] data ); //---------------------------------------------------------------------- parameter BPS115K2 = 14'd10416 ; parameter SAMPLE = 14'd2604 ; //---------------------------------------------------------------------- reg [3 :0] i; reg [13:0] C1; reg [7 :0] D1; reg done; always @ (posedge clk or posedge rst) begin if(rst) begin i <= 4'd0; C1 <= 0 ; D1 <= 8'd0; done <= 1'b0; end else if(enable) begin case(i) 0: if( rxd == 1'b0 ) begin i <= i + 1'b1 ; C1 <= C1 + 1'b1 ; end 1: if(C1 == BPS115K2 - 1) begin C1 <= 8'd0 ; i <= i + 1'b1; end else C1 <= C1 + 1'b1; 2,3,4,5,6,7,8,9: begin if(C1 == SAMPLE) D1[i-2] <= rxd; if(C1 == BPS115K2-1) begin C1 <= 8'd0; i <= i + 1'b1; end else C1 <= C1 + 1'b1; end 10,11: if(C1 == BPS115K2-1) begin C1 <= 8'd0; i <= i + 1'b1; end else C1 <= C1 + 1'b1; 12: begin done <= 1'b1; i <= i + 1'b1; end 13: begin done <= 1'b0; i <= 4'd0; end endcase end end //---------------------------------------------------------------------- assign data = D1; //---------------------------------------------------------------------- ila_2 U9 ( .clk(clk), // input wire clk .probe0(i), // input wire [3:0] probe0 .probe1(D1), // input wire [7:0] probe1 .probe2(done), // input wire [0:0] probe2 .probe3(data), // input wire [7:0] probe3 .probe4(enable), // input wire [0:0] probe4 .probe5(rxd) // input wire [0:0] probe5 ); endmodule
3.顶层文件
`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: // Engineer: chensimin // // Create Date: 2018/12/24 13:40:27 // Design Name: // Module Name: top // Project Name: // Target Devices: // Tool Versions: // Description: // // Dependencies: // // Revision: // Revision 0.01 - File Created // Additional Comments: // ////////////////////////////////////////////////////////////////////////////////// module top ( input wire clk_in1_p, input wire clk_in1_n, output wire txd, input wire rxd ); //--------------------------------------------------------------- wire clk_out1; wire locked; clk_wiz_0 U0 ( .clk_out1(clk_out1), .locked(locked), .clk_in1_p(clk_in1_p), .clk_in1_n(clk_in1_n) ); //--------------------------------------------------------------- wire reset; wire enable; wire [7:0] data; wire enable_rx; vio_0 U1 ( .clk(clk_out1), // input wire clk .probe_in0(locked), // input wire [0 : 0] probe_in0 .probe_out0(reset), // output wire [0 : 0] probe_out0 .probe_out1(enable), // output wire [0 : 0] probe_out1 .probe_out2(data), // output wire [7 : 0] probe_out2 .probe_out3(enable_rx) // output wire [0 : 0] probe_out3 ); //--------------------------------------------------------------- wire done; tx_funcmod_1 U2 ( .clk(clk_out1), .rst(reset), .txd(txd), .enable(enable), .done(done), .data(data) ); //--------------------------------------------------------------- ila_0 U3 ( .clk(clk_out1), // input wire clk .probe0(done), // input wire [0:0] probe0 .probe1(txd), // input wire [0:0] probe1 .probe2(data), // input wire [7:0] probe2 .probe3(rx_done), // input wire [0:0] probe3 .probe4(rx_data) // input wire [7:0] probe4 ); //--------------------------------------------------------------- wire rx_done; wire [7:0] rx_data; rx_funcmod_1 U4 ( .clk(clk_out1), .rst(reset), .rxd(rxd), .enable(enable_rx), .done(rx_done), .data(rx_data) ); endmodule
