From 0d02304dcf35303e83262527c391ec208405a77d Mon Sep 17 00:00:00 2001
From: Peder Bergebakken Sundt <pbsds@hotmail.com>
Date: Sat, 15 Aug 2020 15:48:53 +0200
Subject: [PATCH] Hook up the VGA controller in top, draw a circle

---
 fpga/icebreaker_vga.dg | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/fpga/icebreaker_vga.dg b/fpga/icebreaker_vga.dg
index 870a550..ffe723a 100644
--- a/fpga/icebreaker_vga.dg
+++ b/fpga/icebreaker_vga.dg
@@ -5,6 +5,8 @@ import "/nmigen_dg/*"
 import "/subprocess"
 import "/sys"
 import "common/pipeline"
+import "common/to_signed"
+import "modules/vga/DviController12"
 import "resources/pmod"
 
 
@@ -40,6 +42,9 @@ run_icepll = current target ->
 Top = subclass Elaboratable where
     elaborate = platform ~> m where with m = Module! =>
 
+        # Configure DVI controller
+        dvi = Submodule$ DviController12 x:800 y:480 fps:60
+
         # setup clock
 
         default_clk   = platform.request platform.default_clk dir:"-"
@@ -50,7 +55,7 @@ Top = subclass Elaboratable where
 
         pll_config = run_icepll
             default_freq
-            40e6
+            dvi.pix_freq
         print dvi.timings
         print pll_config
 
@@ -86,9 +91,20 @@ Top = subclass Elaboratable where
         Comb$ platform.request "led_g" :== ~state
 
 
+        # Feed a pciture to the DVI controller
+        Sync$ dvi.r :== 0x0
+        Sync$ dvi.g :== 0x0
+        Sync$ dvi.b :== 0x0
+        cx = to_signed dvi.pixel_x - (800//2)
+        cy = to_signed dvi.pixel_y - (480//2)
+        When (cx*cx + cy*cy < 150**2) $ ->
+            Sync$ dvi.r :== 0xF
+            Sync$ dvi.g :== 0xF
+            Sync$ dvi.b :== 0xF
+
 
 if __name__ == "__main__" =>
     plat = ICEBreakerPlatform!
     plat.add_resources$ pmod.dvi_12bit 0
     plat.add_resources$ plat.break_off_pmod
-    plat.build Top! do_program: ("--flash" in sys.argv)
+    plat.build Top! do_program: ("--flash" in sys.argv) synth_opts: "-dsp"