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Added support for ypbpr
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Till Harbaum
@@ -352,4 +352,5 @@ set_global_assignment -name VHDL_FILE t65/T65_MCode.vhd
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set_global_assignment -name VHDL_FILE t65/T65_ALU.vhd
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set_global_assignment -name VHDL_FILE t65/T65.vhd
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set_global_assignment -name SIGNALTAP_FILE output_files/stp1.stp
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set_global_assignment -name SYSTEMVERILOG_FILE rgb2ypbpr.sv
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set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top
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@@ -83,6 +83,7 @@ parameter CONF_STR_LEN = 8+17+20+28+18+9;
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// the status register is controlled by the on screen display (OSD)
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wire [7:0] status;
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wire tv15khz;
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wire ypbpr;
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wire scanlines = status[2];
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wire joystick_swap = status[3];
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wire memory_16k = status[4];
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@@ -238,6 +239,7 @@ user_io #(.STRLEN(CONF_STR_LEN)) user_io (
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.SPI_MOSI ( SPI_DI ),
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.scandoubler_disable ( tv15khz ),
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.ypbpr ( ypbpr ),
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.buttons ( buttons ),
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.joystick_0 ( js0 ),
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@@ -414,6 +416,8 @@ wire osd_vs_in = tv15khz?!c16_vs:video_vs;
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wire osd_clk = tv15khz?clk7:clk14;
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wire [5:0] red, green, blue;
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// include the on screen display
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osd #(11,0,5) osd (
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.clk_sys ( clk28 ),
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@@ -430,17 +434,32 @@ osd #(11,0,5) osd (
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.hs_in ( osd_hs_in ),
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.vs_in ( osd_vs_in ),
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.red_out ( VGA_R ),
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.green_out ( VGA_G ),
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.blue_out ( VGA_B )
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.red_out ( red ),
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.green_out ( green ),
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.blue_out ( blue )
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);
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wire [5:0] y, pb, pr;
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rgb2ypbpr rgb2ypbpr (
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.red ( red ),
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.green ( green ),
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.blue ( blue ),
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.y ( y ),
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.pb ( pb ),
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.pr ( pr )
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);
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assign VGA_R = ypbpr ? pr : red;
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assign VGA_G = ypbpr ? y : green;
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assign VGA_B = ypbpr ? pb : blue;
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// in 15khz tv mode directly use the c16's composite sync. Otherwise the VGA
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// output is driven from the sync signals generated by the scan doubler. In
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// 15khz mode the VS signal is used as the RGB detect signal on the SCART
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// connector and thus needs to be driven to 1
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assign VGA_HS = tv15khz?c16_cs:video_hs;
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assign VGA_VS = tv15khz?1'b1:video_vs;
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assign VGA_HS = tv15khz?c16_cs:ypbpr ? (video_hs ^ video_vs) : video_hs;
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assign VGA_VS = (tv15khz || ypbpr)?1'b1:video_vs;
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wire video_hs, video_vs;
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wire [5:0] video_r;
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55
cores/c16/rgb2ypbpr.sv
Normal file
55
cores/c16/rgb2ypbpr.sv
Normal file
@@ -0,0 +1,55 @@
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module rgb2ypbpr (
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input [5:0] red,
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input [5:0] green,
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input [5:0] blue,
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output [5:0] y,
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output [5:0] pb,
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output [5:0] pr
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);
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wire [5:0] yuv_full[225] = '{
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6'd0, 6'd0, 6'd0, 6'd0, 6'd1, 6'd1, 6'd1, 6'd1,
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6'd2, 6'd2, 6'd2, 6'd3, 6'd3, 6'd3, 6'd3, 6'd4,
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6'd4, 6'd4, 6'd5, 6'd5, 6'd5, 6'd5, 6'd6, 6'd6,
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6'd6, 6'd7, 6'd7, 6'd7, 6'd7, 6'd8, 6'd8, 6'd8,
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6'd9, 6'd9, 6'd9, 6'd9, 6'd10, 6'd10, 6'd10, 6'd11,
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6'd11, 6'd11, 6'd11, 6'd12, 6'd12, 6'd12, 6'd13, 6'd13,
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6'd13, 6'd13, 6'd14, 6'd14, 6'd14, 6'd15, 6'd15, 6'd15,
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6'd15, 6'd16, 6'd16, 6'd16, 6'd17, 6'd17, 6'd17, 6'd17,
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6'd18, 6'd18, 6'd18, 6'd19, 6'd19, 6'd19, 6'd19, 6'd20,
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6'd20, 6'd20, 6'd21, 6'd21, 6'd21, 6'd21, 6'd22, 6'd22,
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6'd22, 6'd23, 6'd23, 6'd23, 6'd23, 6'd24, 6'd24, 6'd24,
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6'd25, 6'd25, 6'd25, 6'd25, 6'd26, 6'd26, 6'd26, 6'd27,
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6'd27, 6'd27, 6'd27, 6'd28, 6'd28, 6'd28, 6'd29, 6'd29,
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6'd29, 6'd29, 6'd30, 6'd30, 6'd30, 6'd31, 6'd31, 6'd31,
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6'd31, 6'd32, 6'd32, 6'd32, 6'd33, 6'd33, 6'd33, 6'd33,
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6'd34, 6'd34, 6'd34, 6'd35, 6'd35, 6'd35, 6'd35, 6'd36,
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6'd36, 6'd36, 6'd36, 6'd37, 6'd37, 6'd37, 6'd38, 6'd38,
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6'd38, 6'd38, 6'd39, 6'd39, 6'd39, 6'd40, 6'd40, 6'd40,
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6'd40, 6'd41, 6'd41, 6'd41, 6'd42, 6'd42, 6'd42, 6'd42,
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6'd43, 6'd43, 6'd43, 6'd44, 6'd44, 6'd44, 6'd44, 6'd45,
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6'd45, 6'd45, 6'd46, 6'd46, 6'd46, 6'd46, 6'd47, 6'd47,
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6'd47, 6'd48, 6'd48, 6'd48, 6'd48, 6'd49, 6'd49, 6'd49,
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6'd50, 6'd50, 6'd50, 6'd50, 6'd51, 6'd51, 6'd51, 6'd52,
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6'd52, 6'd52, 6'd52, 6'd53, 6'd53, 6'd53, 6'd54, 6'd54,
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6'd54, 6'd54, 6'd55, 6'd55, 6'd55, 6'd56, 6'd56, 6'd56,
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6'd56, 6'd57, 6'd57, 6'd57, 6'd58, 6'd58, 6'd58, 6'd58,
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6'd59, 6'd59, 6'd59, 6'd60, 6'd60, 6'd60, 6'd60, 6'd61,
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6'd61, 6'd61, 6'd62, 6'd62, 6'd62, 6'd62, 6'd63, 6'd63,
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6'd63
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};
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wire [18:0] y_8 = 19'd04096 + ({red, 8'd0} + {red, 3'd0}) + ({green, 9'd0} + {green, 2'd0}) + ({blue, 6'd0} + {blue, 5'd0} + {blue, 2'd0});
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wire [18:0] pb_8 = 19'd32768 - ({red, 7'd0} + {red, 4'd0} + {red, 3'd0}) - ({green, 8'd0} + {green, 5'd0} + {green, 3'd0}) + ({blue, 8'd0} + {blue, 7'd0} + {blue, 6'd0});
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wire [18:0] pr_8 = 19'd32768 + ({red, 8'd0} + {red, 7'd0} + {red, 6'd0}) - ({green, 8'd0} + {green, 6'd0} + {green, 5'd0} + {green, 4'd0} + {green, 3'd0}) - ({blue, 6'd0} + {blue , 3'd0});
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wire [7:0] y_i = ( y_8[17:8] < 16) ? 8'd16 : ( y_8[17:8] > 235) ? 8'd235 : y_8[15:8];
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wire [7:0] pb_i = (pb_8[17:8] < 16) ? 8'd16 : (pb_8[17:8] > 240) ? 8'd240 : pb_8[15:8];
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wire [7:0] pr_i = (pr_8[17:8] < 16) ? 8'd16 : (pr_8[17:8] > 240) ? 8'd240 : pr_8[15:8];
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assign pr = yuv_full[pr_i - 8'd16];
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assign y = yuv_full[y_i - 8'd16];
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assign pb = yuv_full[pb_i - 8'd16];
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endmodule
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