基于EBAZ4205矿板的图像处理：02生成测试彩条图像
生成测试彩条图像可以有两种方式
VDMA缓存PS端生成彩条图像数据，PL端输出
这里可以直接看超级大电工开源的代码，写的很好详细，我就不再班门弄斧了（下面是链接）
EBAZ4205 第二十四个工程 用VDMA模块来缓存图像并在HDMI上显示（一）800X600分辨率测试
verilog生成彩条图像数据，PL端输出
先看效果
项目讲解
采用的是纯PL端的方案，PS只是用来点灯和uart打印了
下面是block design
时钟和复位，我用的都是片外的，实测用PS端生成的也可以，甚至那个clock wizard不用，时钟全都由PS生成也可以。
clock wizard的设置如下
这里根据800X600的分辨率设置了PCLK和PCLKX5。
在写这个项目之前，我有过疑惑，为啥他们都用的是800X600这种“远古”分辨率，老子要上1080P，但是实际写下来发现，clock wizard确实可以倍频到那么高的频率，但是生成的不准，timing约束时会报错。
所以我就老老实实的改成生成800X600分辨率了。
其他的就是HDMI_test模块了，它还包含了hdmi_timming_generator和hdmi_color_bar_generator模块，分别负责生成图像的行场同步信号和色彩数据。
代码
hdmi_test
`timescale 1ns / 1ps
`define UD #1
module hdmi_test(
input wire rstn ,
input pclk ,
output vs_out ,
output hs_out ,
output de_out ,
output [23:0] rgb_out
);
parameter X_WIDTH = 4'd12;
parameter Y_WIDTH = 4'd12;
//600p
parameter H_TOTAL = 12'd1056;
parameter H_ACT = 12'd800;
parameter H_FP = 12'd40;
parameter H_SYNC = 12'd128;
parameter H_BP = 12'd88;
parameter HV_OFFSET = 12'd0;
parameter V_TOTAL = 12'd628;
parameter V_ACT = 12'd600;
parameter V_FP = 12'd1;
parameter V_SYNC = 12'd4;
parameter V_BP = 12'd23;
wire [X_WIDTH - 1'b1:0] act_x ;
wire [Y_WIDTH - 1'b1:0] act_y ;
wire hs ;
wire vs ;
wire de ;
reg [3:0] reset_delay_cnt;
wire [7:0] r_out;
wire [7:0] g_out;
wire [7:0] b_out;
assign rgb_out = {r_out,g_out,b_out};
hdmi_timming_generator #(
.X_BITS ( X_WIDTH ),
.Y_BITS ( Y_WIDTH ),
.V_TOTAL ( V_TOTAL ),
.V_FP ( V_FP ),
.V_BP ( V_BP ),
.V_SYNC ( V_SYNC ),
.V_ACT ( V_ACT ),
.H_TOTAL ( H_TOTAL ),
.H_FP ( H_FP ),
.H_BP ( H_BP ),
.H_SYNC ( H_SYNC ),
.H_ACT ( H_ACT )
) hdmi_timming_generator1
(
.clk ( pclk ),
.rstn ( rstn ),
.vs_out ( vs ),
.hs_out ( hs ),
.de_out ( de ),
.x_act ( act_x ),
.y_act ( act_y )
);
hdmi_color_bar_generator #(
.COCLOR_DEPP ( 8 ),
.X_BITS ( X_WIDTH ),
.Y_BITS ( Y_WIDTH ),
.H_ACT ( H_ACT ),
.V_ACT ( V_ACT )
) // Number of fractional bits for ramp pattern
hdmi_color_bar_generator1 (
.rstn ( rstn_out ),
.pix_clk ( pclk ),
.act_x ( act_x ),
// input video timing
.vs_in ( vs ),
.hs_in ( hs ),
.de_in ( de ),
// test pattern image output
.vs_out ( vs_out ),
.hs_out ( hs_out ),
.de_out ( de_out ),
.r_out ( r_out ),
.g_out ( g_out ),
.b_out ( b_out )
);
endmodule
hdmi_timming_generator
`timescale 1ns / 1ps
`define UD #1
module hdmi_timming_generator # (
parameter X_BITS=4'd12,
parameter Y_BITS=4'd12,
parameter V_TOTAL = 12'd750,
parameter V_FP = 12'd5,
parameter V_BP = 12'd20,
parameter V_SYNC = 12'd5,
parameter V_ACT = 12'd720,
parameter H_TOTAL = 12'd1650,
parameter H_FP = 12'd110,
parameter H_BP = 12'd220,
parameter H_SYNC = 12'd40,
parameter H_ACT = 12'd1280
)(
input clk,
input rstn,
output reg vs_out,
output reg hs_out,
output reg de_out,
output reg [X_BITS-1:0] x_act,
output reg [Y_BITS-1:0] y_act
);
// parameter HV_OFFSET = 12'd0 ;
reg [X_BITS-1:0] h_count = 'd0;
reg [Y_BITS-1:0] v_count = 'd0;
always @(posedge clk)
begin
if (!rstn)
h_count <= `UD 0;
else
begin
if (h_count < H_TOTAL - 1)
h_count <= `UD h_count + 1;
else
h_count <= `UD 0;
end
end
always @(posedge clk)
begin
if (!rstn)
v_count <= `UD 0;
else
if (h_count == H_TOTAL - 1)
begin
if (v_count == V_TOTAL - 1)
v_count <= `UD 0;
else
v_count <= `UD v_count + 1;
end
end
always @(posedge clk)
begin
if (!rstn)
hs_out <= `UD 4'b0;
else
hs_out <= `UD ((h_count < H_SYNC));
end
always @(posedge clk)
begin
if (!rstn)
vs_out <= `UD 4'b0;
else
begin
if (v_count == 0)
vs_out <= `UD 1'b1;
else if (v_count == V_SYNC)
vs_out <= `UD 1'b0;
else
vs_out <= `UD vs_out;
end
end
always @(posedge clk)
begin
if (!rstn)
de_out <= `UD 4'b0;
else
de_out <= (((v_count >= V_SYNC + V_BP) && (v_count <= V_TOTAL - V_FP - 1)) &&
((h_count >= H_SYNC + H_BP) && (h_count <= H_TOTAL - H_FP - 1)));
end
always @(posedge clk)
begin
if (!rstn)
x_act <= `UD 'd0;
else
begin
if(h_count > (H_SYNC + H_BP - 1'b1))
x_act <= `UD (h_count - (H_SYNC + H_BP));
else
x_act <= `UD 'd0;
end
end
always @(posedge clk)
begin
if (!rstn)
y_act <= `UD 'd0;
else
begin
if(v_count > (V_SYNC + V_BP - 1'b1))
y_act <= `UD (v_count - (V_SYNC + V_BP));
else
y_act <= `UD 'd0;
end
end
endmodule
hdmi_color_bar_generator
`timescale 1ns / 1ps
`define UD #1
module hdmi_color_bar_generator # (
parameter COCLOR_DEPP=8,
parameter X_BITS=13,
parameter Y_BITS=13,
parameter H_ACT = 12'd1280,
parameter V_ACT = 12'd720
)(
input rstn,
input pix_clk,
input [X_BITS-1:0] act_x,
input vs_in,
input hs_in,
input de_in,
output reg vs_out,
output reg hs_out,
output reg de_out,
output reg [COCLOR_DEPP-1:0] r_out,
output reg [COCLOR_DEPP-1:0] g_out,
output reg [COCLOR_DEPP-1:0] b_out
);
localparam H_ACT_ARRAY_0 = H_ACT/8;
localparam H_ACT_ARRAY_1 = 2* (H_ACT/8);
localparam H_ACT_ARRAY_2 = 3* (H_ACT/8);
localparam H_ACT_ARRAY_3 = 4* (H_ACT/8);
localparam H_ACT_ARRAY_4 = 5* (H_ACT/8);
localparam H_ACT_ARRAY_5 = 6* (H_ACT/8);
localparam H_ACT_ARRAY_6 = 7* (H_ACT/8);
localparam H_ACT_ARRAY_7 = 8* (H_ACT/8);
always @(posedge pix_clk)
begin
vs_out <= `UD vs_in;
hs_out <= `UD hs_in;
de_out <= `UD de_in;
end
always @(posedge pix_clk)
begin
if (de_in)
begin
if(act_x < H_ACT_ARRAY_0)
begin
r_out <= 8'hff;
g_out <= 8'hff;
b_out <= 8'hff;
end
else if(act_x < H_ACT_ARRAY_1)
begin
r_out <= 8'hff;
g_out <= 8'hff;
b_out <= 8'h00;
end
else if(act_x < H_ACT_ARRAY_2)
begin
r_out <= 8'h00;
g_out <= 8'hff;
b_out <= 8'hff;
end
else if(act_x < H_ACT_ARRAY_3)
begin
r_out <= 8'h00;
g_out <= 8'hff;
b_out <= 8'h00;
end
else if(act_x < H_ACT_ARRAY_4)
begin
r_out <= 8'hff;
g_out <= 8'h00;
b_out <= 8'hff;
end
else if(act_x < H_ACT_ARRAY_5)
begin
r_out <= 8'hff;
g_out <= 8'h00;
b_out <= 8'h00;
end
else if(act_x < H_ACT_ARRAY_6)
begin
r_out <= 8'h00;
g_out <= 8'h00;
b_out <= 8'hff;
end
else
begin
r_out <= 8'h0;
g_out <= 8'h0;
b_out <= 8'h0;
end
end
else
begin
r_out <= 8'h00;
g_out <= 8'h00;
b_out <= 8'h00;
end
end
endmodule
