gateware

commit 0d6544e47a7bf4f517653ba281efa9f296f672b2
parent 38ba90f150915b99d24ec4216254ef503f01bfa1
Author: Brian Swetland <swetland@frotz.net>
Date:   Sat, 17 Nov 2018 12:13:25 -0800

hack: make vga background red when cpu is held in reset

Diffstat:
M
hdl/ice40.v
 | 
13
++++++++++---

1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/hdl/ice40.v b/hdl/ice40.v
@@ -119,11 +119,13 @@ sram ram1(
 	.we(we & cs1w & cs_sram)
 	);
 
+wire [1:0]vr, vg, vb;
+
 vga40x30x2 vga(
 	.clk25m(clk25m),
-	.red(vga_r),
-	.grn(vga_g),
-	.blu(vga_b),
+	.red(vr),
+	.grn(vg),
+	.blu(vb),
 	.hs(vga_hsync),
 	.vs(vga_vsync),
 	.vram_waddr(waddr[10:0]),
@@ -132,6 +134,11 @@ vga40x30x2 vga(
 	.vram_clk(sys_clk)
 	);
 
+// hack: flip display from blue to red when CPU is held in reset
+assign vga_r = cpu_reset ? vb : vr;
+assign vga_g = vg;
+assign vga_b = cpu_reset ? vr : vb;
+
 endmodule
 
 module sram(