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Lightgun: reset rhe registers to prevent using BRAM as a shift register

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Sergiy Dvodnenko
2026-05-07 16:06:02 +03:00
parent 7724b5383b
commit 3375dd94a0
1 changed files with 7 additions and 6 deletions
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13
rtl/lightgun.sv
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@@ -75,7 +75,7 @@ always @(posedge CLK) begin
reg [9:0] hcnt;
reg [8:0] vcnt;
reg [8:0] vtotal;
reg [15:0] hde_d;
reg [16:0] hde_d;
reg [9:0] xm,xp;
reg [8:0] ym,yp;
reg [8:0] cross_sz;
@@ -132,12 +132,13 @@ always @(posedge CLK) begin
else lg_y <= j_y - 9'd8;
end
if(CE_PIX) begin
hde_d <= {hde_d[14:0],HDE};
old_hde <= hde_d[15];
if(RESET) begin
hde_d <= '0;
end else if(CE_PIX) begin
hde_d <= {hde_d[15:0],HDE};
if(~&hcnt) hcnt <= hcnt + 1'd1;
if(~old_hde & ~HDE) hcnt <= 0;
if(old_hde & ~hde_d[15]) begin
if(~hde_d[16] & ~HDE) hcnt <= 0;
if(hde_d[16] & ~hde_d[15]) begin
if(~VDE) begin
vcnt <= 0;
if(vcnt) vtotal <= vcnt - 1'd1;