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sys: improved framebuffer transition.

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sorgelig
2019-05-21 14:56:55 +08:00
parent 97dedbfbc5
commit 6ee34ceb17
1 changed files with 30 additions and 12 deletions
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42
sys/sys_top.v
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@@ -528,23 +528,41 @@ always @(posedge clk_vid) begin
reg [11:0] videoh;
reg old_vs;
reg vsd1,vsd2;
reg [11:0] vset;
reg fb_set = 0;
reg fb_set1, fb_set2 = 0;
reg fb_en = 0;
reg [1:0] trans = 0;
old_vs <= HDMI_TX_VS;
if(old_vs & ~HDMI_TX_VS) begin
fb_set <= FB_SET;
if(fb_set ^ FB_SET) begin
SC_BASE <= FB_EN ? FB_BASE : VIDEO_BUF;
fb_en <= FB_EN;
if(FB_EN) SC_FREEZE <= 1;
vsd1 <= HDMI_TX_VS;
if(vsd1 == HDMI_TX_VS) vsd2 <= vsd1;
old_vs <= vsd2;
if(old_vs & ~vsd2) begin
if(trans) trans <= trans - 1'd1;
if(trans == 2) fb_en <= FB_EN;
if(trans == 1) begin
SC_MODE <= fb_en;
SC_BASE <= fb_en ? FB_BASE : VIDEO_BUF;
SC_FMT <= fb_en ? FB_FMT[1:0] : 2'd1;
if(~fb_en) SC_FREEZE <= 0;
end
end
else if(~old_vs & HDMI_TX_VS) begin
SC_MODE <= fb_en;
SC_FMT <= fb_en ? FB_FMT[1:0] : 2'd1;
if(~fb_en) SC_FREEZE <= 0;
fb_set1 <= FB_SET;
fb_set2 <= fb_set1;
if(fb_set2 ^ fb_set1) begin
if(FB_EN) SC_FREEZE <= 1;
//already in FB mode - safe to switch the address/format now
if(SC_MODE & FB_EN) begin
SC_BASE <= FB_BASE;
SC_FMT <= FB_FMT[1:0];
end
else begin
trans <= 3;
end
end
state <= state + 1'd1;