From 20941292ad06585524dd58afc57689ffb98297f3 Mon Sep 17 00:00:00 2001
From: Miodrag Milanovic <mmicko@gmail.com>
Date: Sat, 21 Jul 2018 09:22:09 +0200
Subject: [PATCH] fix introduced bug

---
 ice40/bitstream.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ice40/bitstream.cc b/ice40/bitstream.cc
index 1acaad0e..924868b5 100644
--- a/ice40/bitstream.cc
+++ b/ice40/bitstream.cc
@@ -481,6 +481,8 @@ void write_asc(const Context *ctx, std::ostream &out)
     for (int y = 0; y < ci.height; y++) {
         for (int x = 0; x < ci.width; x++) {
             TileType tile = tile_at(ctx, x, y);
+            if (tile == TILE_NONE)
+                continue;
             out << tagTileType(tile);
             out << " " << x << " " << y << std::endl;
             for (auto row : config.at(y).at(x)) {