Wip dev

zynq/video_ip_test/README.md

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+## Xilinx Video IP Test
+
+![photo](tp.jpg)
+
+In this project, we explore the following video IPs provided by Xilinx:
+
+- Video Timing Controller (VTC)
+- Video Test Pattern Generator (TPG)
+- AXI Stream to Video Out
+
+We use the above IPs to generate test patterns and display them via VGA.
+
+This project uses Vivado 2018.3.
+
+Here's the block diagram:
+
+![bd](bd.png)
+
+Here's the Verilog code that splits the data from *AXI Stream to Video Out* into 4 bit RGB video suitable 
+for a Digilent PmodVGA adapter.
+
+```
+module vga_out(
+    input wire clk,
+    input wire [23:0] data,
+    input wire ihsync,
+    input wire ivsync,
+    input wire video_enable,
+    output reg [3:0] vga_r,
+    output reg [3:0] vga_g,
+    output reg [3:0] vga_b,
+    output reg hsync,
+    output reg vsync
+    );
+
+
+    always @ (posedge clk) begin
+
+        if (!video_enable) 
+            begin
+                vga_r <= 4'd0;
+                vga_g <= 4'd0;
+                vga_b <= 4'd0;
+
+            end
+        else 
+            begin        
+                vga_r <= data[23:20];
+                vga_g <= data[15:12];
+                vga_b <= data[7:4];
+            end
+
+        hsync <= ihsync;
+        vsync <= ivsync;        
+
+    end
+
+endmodule
+```
+
+
+Here's the code on the PS:
+
+```
+#include <stdio.h>
+#include "platform.h"
+#include "xil_printf.h"
+
+#include "xil_io.h"
+#include "sleep.h"
+
+#define TPG_BASS_ADDR XPAR_V_TPG_0_S_AXI_CTRL_BASEADDR
+
+void tpg_start(int value) {
+	// set H & W
+	Xil_Out32(TPG_BASS_ADDR + 0x0010, 480);
+	Xil_Out32(TPG_BASS_ADDR + 0x0018, 640);
+	// set pattern
+	Xil_Out32(TPG_BASS_ADDR + 0x0020, value);
+	// set auto-start
+	Xil_Out32(TPG_BASS_ADDR + 0x0000, 0x81);
+}
+
+int main()
+{
+    init_platform();
+
+    tpg_start(0x9);
+
+    print("Video IP Test...\n\r");
+
+    // cycle through patterns
+    int i = 1;
+    for(;;) {
+
+    	tpg_start(i++);
+
+		if (i == 0x14) {
+			i = 1;
+		}
+
+    	usleep(3000000);
+    }
+
+
+    cleanup_platform();
+    return 0;
+}
+```
+
+## Video
+
+You can see this project in action below:
+
+[![video](https://img.youtube.com/vi/YyHsUyiGFTA/hqdefault.jpg)](https://youtu.be/YyHsUyiGFTA)
+