DE1 VGA help!

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So far i've got this - I've looked at sample code, but I'm kinda stuck atm

just won't work - any ideas? Thanks!!

In verilog~

/////////////////////////////////////////////////////////////////////////////////

// VGA Controller

/////////////////////////////////////////////////////////////////////////////////

always @(posedge CLOCK_50) begin

if (count1 == 0) begin

ledcounter = ledcounter+1;

end

count1 = count1+1;

//divide by 2 = 25 MHz

if (count == 1) begin

count = 0;

end

else begin

refreshHVGA();

refreshVVGA();

count = 1;

end

end

// Horizontal

// 96 Sync

// 48 Back Porch

// 640 Pixel

// 16 Front Porch

// 800 total

task refreshHVGA;

begin

//Reset

if (h_cnt == 800) begin

h_cnt = 0;

v_cnt = v_cnt+1;

end

if (h_cnt == 0) begin

//Sync (96 cycles)

vga_h_sync = 0;

p_flag = 0;

end

else if (h_cnt == 96) begin

//Back Porch B (48 cycles)

vga_h_sync = 1;

end

else if(h_cnt == 144) begin

//Display Interval C (640 cycles)

if(v_flag) begin

//RGB Row On

//get from BMP file

red = 255;

green = 0;

blue = 0;

end

end

else if (h_cnt == 784) begin

//Front Porch D (0.6 us)

//set output to 0

red = 0;

green = 0;

blue = 0;

end

h_cnt = h_cnt+1;

end

endtask

// Vertical

// 2 Sync

// 33 Front Porch

// 480 Video Lines

// 10 Back Porch

// 525 Lines total

task refreshVVGA;

begin

//Reset

if (v_cnt == 525) begin

v_cnt = 0;

end

if (v_cnt == 0) begin

//Sync A (2 lines)

vga_v_sync = 0;

end

else if (v_cnt == 2) begin

//Back Porch B (33 lines)

vga_v_sync = 1;

end

else if (v_cnt == 35) begin

//Display Interval C (480 lines)

//wait for horizontal to do it's job

v_flag = 1;

end

else if (v_cnt == 515) begin

//Front Porch D (10 lines)

v_flag = 0;

end

end

endtask

endmodule

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1. This is not a complete hardware description, I can't determine which signals are wires and which signals are ports. So it is pretty much impossible to debug.

For instance, you set p_flag and use v_flag? I think by "p_flag", you actually mean "v_flag"?

2. Did you try simulating your module (in ModelSim, for example) and/or looking at your 25 MHz clock, VSync, HSync, R, G, B lines using a logic analyzer? If you did, please post a screen shot of your simulation and/or logic analyzer results.

Bart

Sorry!!

output VGA_HS; // VGA H_SYNC

output VGA_VS; // VGA V_SYNC

output [3:0] VGA_R; // VGA Red[3:0]

output [3:0] VGA_G; // VGA Green[3:0]

output [3:0] VGA_B; // VGA Blue[3:0]

// 50 Mhz clock

input CLOCK_50; // 50

reg [0:7] count, h_cnt, v_cnt, p_cnt;

reg [0:4] red, green, blue;

reg [0:1] vga_h_sync, vga_v_sync;

reg [0:1] p_flag, v_flag;

****p_flg is no longer used

reg [0:20] count1; //for running LEDs

assign VGA_HS = vga_h_sync;

assign VGA_VS = vga_v_sync;

assign VGA_R = red;

assign VGA_G = green;

assign VGA_B = blue;

No, I do not have modelsim, ill go grab it

//nvm, need licence and whatever :-/