Image via HDMI using SPARTAN 6.

[zuhaib]

Hello,



I have a .jpeg image. I converted it into a raw r,g,b image. After that I converted it into a hex file. I am using that file as an input and want to view the image via HDMI output port onto the monitor. I am using the demo XAPP495 .PDF document and modified the module hdlcolorbar.v, The modified code is:



module hdcolorbar(
input i_clk_74M, //74.25 MHZ pixel clock
input i_rst,

input [10:0] i_vcnt, //vertical counter from video timing generator
input [10:0] i_hcnt, //horizontal counter from video timing generator

output wire[7:0] o_r,
output wire[7:0] o_g,
output wire[7:0] o_b,
input wr_e
);

wire addr2;

videoram video_inst (
.r (o_r),
.b (o_b),
.g (o_g),
.clk (i_clk_74M),
.rst (i_rst),
.addr (addr2),
.we (wr_e)
);

assign addr2 = i_vcnt[3:0]*16+i_hcnt[3:0];


endmodule



The video ram block is:



module videoram(clk, we, addr, din, r, b, g, rst);
input clk;
input rst;
input we;
input [7:0] addr;
input [23:0] din;

output reg[7:0] r;
output reg[7:0] g;
output reg[7:0] b;

reg [23:0] ram [0:255];


initial
begin
$readmemh("test.rbg",ram);
end

always @(posedge clk)
begin
if (rst)
begin
r <= 0;
g <= 0;
b <= 0;
end
else if (we)

ram[addr] <= din;
begin
r<=ram[addr][23:16];
g<=ram[addr][15:8];
b<=ram[addr][7:0];
end
end

endmodule



And in the vtc_demo.v, I have only modified the hdlcolorbar module as:



hdcolorbar clrbar(
.i_clk_74M(pclk),
.i_rst(reset),
.i_hcnt(bgnd_hcount),
.i_vcnt(bgnd_vcount),

.o_r(red_data),
.o_g(green_data),
.o_b(blue_data)
);



I have successfully synthesized the code that is there is no error in the code but it doesn't show any image. The image is 16x16. Can anyone have the idea where the problem is?



Regards

 

[vjabagch]

Just curious if you have included the UCF file with your project? Usually when I do not get any response from the FPGA it is because I have not included valid UCF file with the source code.

Also, where do you want the image to appear? Center, repeated, stretched...etc? If you want to center the image, then check when the count reaches the center (plus or minus half of the width/height of the object) so that you can start drawing the object. In other words you assert data enable when this condition is met. You would draw the object from the center (call it x,y) and offset it to the object dimensions (x-8, y-8) up to (x+8, y+8). It seems like you are taking the lower 4 bits from the horizontal/vertical counters and using it to output to the monitor which might or might not be your intent.

Also where are you including the memory file in your directory when you implement your design?

Finally, what is your desired resolution?

Hope this helps.

Good Luck.