From a17aded8d651757a884580c99f1a7480dd817304 Mon Sep 17 00:00:00 2001
From: Markus Sattler <help.markus+git@gmail.com>
Date: Wed, 13 May 2015 22:54:09 +0200
Subject: [PATCH] add hexdump function for easy debugging.

Output:
[HEXDUMP] Address: 0x3FFF5188 len: 0x200 (512)
[0x3FFF5188] 0x00000000: E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1
[0x3FFF5198] 0x00000010: E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1
[0x3FFF51A8] 0x00000020: E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1
[0x3FFF51B8] 0x00000030: E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1
[0x3FFF51C8] 0x00000040: E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1
[0x3FFF51D8] 0x00000050: E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1
[0x3FFF51E8] 0x00000060: E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1 E6 D1
....
---
 cores/esp8266/Arduino.h |  3 +++
 cores/esp8266/debug.cpp | 21 +++++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 cores/esp8266/debug.cpp

diff --git a/cores/esp8266/Arduino.h b/cores/esp8266/Arduino.h
index 6db13a088..9cc4ad08b 100644
--- a/cores/esp8266/Arduino.h
+++ b/cores/esp8266/Arduino.h
@@ -229,6 +229,9 @@ long random(long, long);
 void randomSeed(unsigned int);
 long map(long, long, long, long, long);
 
+// Debugging functions
+void hexdump(uint8_t *mem, uint32_t len, uint8_t cols = 16);
+
 #endif
 
 #include "pins_arduino.h"
diff --git a/cores/esp8266/debug.cpp b/cores/esp8266/debug.cpp
new file mode 100644
index 000000000..c42016b04
--- /dev/null
+++ b/cores/esp8266/debug.cpp
@@ -0,0 +1,21 @@
+/*
+ * debug.c
+ *
+ *  Created on: 13.05.2015
+ *      Author: Markus Sattler
+ */
+
+#include "Arduino.h"
+
+void ICACHE_RAM_ATTR hexdump(uint8_t *mem, uint32_t len, uint8_t cols) {
+    os_printf("\n[HEXDUMP] Address: 0x%08X len: 0x%X (%d)", mem, len, len);
+    for(uint32_t i = 0; i < len; i++) {
+        if(i % cols == 0) {
+            os_printf("\n[0x%08X] 0x%08X: ", mem, i);
+        }
+        os_printf("%02X ", *mem);
+        mem++;
+    }
+    os_printf("\n");
+}
+