From 310a5a6be1ba062b367dad76b86d23a703d2f554 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Tue, 2 Apr 2013 13:07:56 +1100
Subject: [PATCH] DataFlash: don't try to write if no card inserted

---
 libraries/DataFlash/DataFlash_Block.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/DataFlash/DataFlash_Block.cpp b/libraries/DataFlash/DataFlash_Block.cpp
index f77cfb3b8a..b2746ca9fa 100644
--- a/libraries/DataFlash/DataFlash_Block.cpp
+++ b/libraries/DataFlash/DataFlash_Block.cpp
@@ -33,6 +33,9 @@ void DataFlash_Block::FinishWrite(void)
 
 void DataFlash_Block::WriteBlock(const void *pBuffer, uint16_t size)
 {
+    if (!CardInserted()) {
+        return;
+    }
     while (size > 0) {
         uint16_t n = df_PageSize - df_BufferIdx;
         if (n > size) {