From 41b5ec5e358e33f93237153c0dff2bba1b837e2f Mon Sep 17 00:00:00 2001
From: hugo LAMY <hugo.lamy@oskey.io>
Date: Thu, 6 Mar 2025 02:01:04 +0100
Subject: [PATCH] added test macro in readme

---
 README.md | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/README.md b/README.md
index 2021fb6..0323bb8 100644
--- a/README.md
+++ b/README.md
@@ -79,3 +79,38 @@ avrdude: safemode: Fuses OK (E:00, H:00, L:00)
 
 avrdude done.  Thank you.
 ```
+
+## test macros
+
+#include <stdio.h>
+#include <avr/io.h>
+
+// // stringify
+#define STRINGIFY_HELPER(x) #x
+#define STRINGIFY(x) STRINGIFY_HELPER(x)
+
+#define CONCAT_HELPER(x, y) x ## y
+#define CONCAT(x, y) CONCAT_HELPER(x, y)
+
+// get argument at nth position
+#define ARG_1(v1, v2) v1
+#define ARG_2(v1, v2) v2
+#define GET_PORT(args) ARG_1 args
+#define GET_BIT(args) ARG_2 args
+
+// actions on registers
+#define SET(register, bit) register |= 1 << bit
+
+// actions on ports
+#define MODE_OUTPUT(elem) SET(CONCAT(DDR, GET_PORT(elem)), GET_BIT(elem))
+
+// elements
+#define LED1 (B, 0)
+
+int main()
+{
+MODE_OUTPUT(LED1);
+
+    return 0;
+
+}