差别

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到此差别页面的链接

--- rs-232 [2017/03/26 19:51]
gongyu [接收器]
+++ rs-232 [2017/03/26 20:00] (当前版本)
gongyu [应用案例]
@@ 行 315: / 行 315: @@
 ====== 应用案例 ======
+This design allows controlling a few FPGA pins from your PC (through your PC's serial port).
+  * It create 8 outputs on the FPGA (port named "GPout"). GPout is updated by any character that the FPGA receives.
+  * Also 8 inputs on the FPGA (port named "GPin"). GPin is transmitted every time the FPGA receives a character.
+The GP outputs can be used to control anything remotely from your PC, might be LEDs or a coffee machine...
+<code verilog>
+module serialGPIO(
+    input clk,
+    input RxD,
+    output TxD,
+    output reg [7:0] GPout,  // general purpose outputs
+    input [7:0] GPin  // general purpose inputs
+);
+wire RxD_data_ready;
+wire [7:0] RxD_data;
+async_receiver RX(.clk(clk), .RxD(RxD), .RxD_data_ready(RxD_data_ready), .RxD_data(RxD_data));
+always @(posedge clk) if(RxD_data_ready) GPout <= RxD_data;
+async_transmitter TX(.clk(clk), .TxD(TxD), .TxD_start(RxD_data_ready), .TxD_data(GPin));
+endmodule
+</code>
+Remember to grab the async_receiver and async_transmitter modules here, and to update the clock frequency values inside.