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[Gameboy] LCD fixes

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- Fix leftmost wobbling pixels
- Adjust front-back porch sizes for better centering
This commit is contained in:
Gyorgy Szombathelyi
2019-02-16 13:56:02 +01:00
parent cc1af43816
commit 5ac4df591b
1 changed files with 9 additions and 10 deletions
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19
cores/gameboy/lcd.v
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@@ -44,22 +44,21 @@ always @(posedge clk) begin
shift_reg[shift_reg_wptr] <= data;
shift_reg_wptr <= {p_toggle, shift_reg_wptr[7:0] + 1'd1};
end
end
last_mode_in <= mode;
// reset write pointer at end of hsync phase
if((mode != 2'b00) && (last_mode_in == 2'b00)) begin
shift_reg_wptr <= 0;
p_toggle <= !p_toggle;
end
last_mode_in <= mode;
// reset write pointer at end of hsync phase
if((mode != 2'b00) && (last_mode_in == 2'b00)) begin
shift_reg_wptr <= {!p_toggle, 8'd0};
p_toggle <= !p_toggle;
end
end
//
parameter H = 160; // width of visible area
parameter HFP = 24; // unused time before hsync
parameter HFP = 18; // unused time before hsync
parameter HS = 20; // width of hsync
parameter HBP = 24; // unused time after hsync
parameter HBP = 30; // unused time after hsync
// total = 228
parameter V = 576; // height of visible area
@@ -131,7 +130,7 @@ always@(posedge clk) begin
shift_reg_rptr <= {!p_toggle, shift_reg_rptr[7:0] + 1'd1};
end else begin
blank <= 1'b1;
shift_reg_rptr <= 0;
shift_reg_rptr <= {!p_toggle, 8'd0};
end
end
end