From f4df95e6a0e866ccb6e41429dc6bbfd5efcca9b3 Mon Sep 17 00:00:00 2001
From: Ole Odendahl <oleodendahl@gmail.com>
Date: Sun, 23 Oct 2022 11:38:12 +0200
Subject: [PATCH] Added mac converter class for easy reading of mac address
 from microcontroller.

---
 flashing/.gitignore       |  1 +
 flashing/mac_converter.py | 31 +++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 flashing/.gitignore
 create mode 100644 flashing/mac_converter.py

diff --git a/flashing/.gitignore b/flashing/.gitignore
new file mode 100644
index 0000000..ba0430d
--- /dev/null
+++ b/flashing/.gitignore
@@ -0,0 +1 @@
+__pycache__/
\ No newline at end of file
diff --git a/flashing/mac_converter.py b/flashing/mac_converter.py
new file mode 100644
index 0000000..800c7e7
--- /dev/null
+++ b/flashing/mac_converter.py
@@ -0,0 +1,31 @@
+from pyocd.core.target import Target
+
+
+class MacConverter():
+
+    MEMORY_ADDRESS = 268435620 # 0x100000A4
+    
+    def __init__(self, target: Target) -> None:
+        self.target = target
+
+    def get_mac_address(self) -> str:
+        memory_blocks = self._get_blocks()
+
+        return self._convert_blocks(memory_blocks)
+
+    def _get_blocks(self):
+        memory_blocks = self.target.read_memory_block32(self.MEMORY_ADDRESS, 2)
+
+        return memory_blocks
+
+    def _convert_blocks(self, memory_blocks: list[int]) -> str:
+        first_block = f'{memory_blocks[0]:x}'.rjust(8, '0')
+
+        modified_second_block = memory_blocks[1] | 49152 # Bitwise OR with 0xc000
+
+        second_block = f'{modified_second_block:x}'
+
+        mac_string = (second_block[4:] + first_block)
+        prettified_mac = ':'.join(mac_string[i:i+2] for i in range(0, len(mac_string), 2))
+
+        return prettified_mac.upper()