From e482e6fbc71a78fbb1acffd6279df5d4138a70c5 Mon Sep 17 00:00:00 2001
From: Tokita Hiroshi <tokita.hiroshi@gmail.com>
Date: Mon, 14 Sep 2020 15:59:42 -0700
Subject: Add -DARDUINO_{build.board} for compile options

---
 arduino-mk-vars.md | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'arduino-mk-vars.md')

diff --git a/arduino-mk-vars.md b/arduino-mk-vars.md
index 7c42416..0907eb2 100644
--- a/arduino-mk-vars.md
+++ b/arduino-mk-vars.md
@@ -583,6 +583,26 @@ CORE = tiny
 
 ----
 
+### BOARD
+
+**Description:**
+
+Board identifier that passes to a compile option as -DARDUINO_$(BOARD).
+
+Usually can be auto-detected as `build.board` from `boards.txt`.
+
+If not found build.board entry, use upper-case converted "$(ARCHITECTURE)_$(BOARD_TAG)".
+
+**Example:**
+
+```Makefile
+BOARD = AVR_LEONARD
+```
+
+**Requirement:** *Optional*
+
+----
+
 ### VARIANT
 
 **Description:**
-- 
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