DataFlash: use ChipErase() instead of PageErase() on all pages

This makes the DataFlash erase much faster (about 6 seconds instead of
about 60 seconds).

We need to test and ensure the behaviour is equivalent apart from the
speed

libraries/DataFlash/DataFlash.cpp

@@ -188,13 +188,8 @@ uint16_t DataFlash_Class::GetFilePage()
 
 void DataFlash_Class::EraseAll(void (*delay_cb)(unsigned long))
 {
+    ChipErase(delay_cb);
 	SetFileNumber(0xFFFF);
-	for(uint16_t j = 1; j <= df_NumPages; j++) {
-		PageErase(j);
-		StartWrite(j);
-        delay_cb(1);
-	}
-
     // write the logging format in the last page
     StartWrite(df_NumPages+1);
     WriteLong(DF_LOGGING_FORMAT);

libraries/DataFlash/DataFlash.h

@@ -32,7 +32,7 @@ class DataFlash_Class
 	virtual void PageToBuffer(unsigned char BufferNum, uint16_t PageAdr) = 0;
 	virtual unsigned char BufferRead (unsigned char BufferNum, uint16_t IntPageAdr) = 0;
 	virtual void PageErase(uint16_t PageAdr) = 0;
-	virtual void ChipErase(void) = 0;
+	virtual void ChipErase(void (*delay_cb)(unsigned long)) = 0;
 
 	// internal high level functions
 	int find_last_page(void);

libraries/DataFlash/DataFlash_APM1.cpp

@@ -294,7 +294,7 @@ void DataFlash_APM1::PageErase (uint16_t PageAdr)
 }
 
 
-void DataFlash_APM1::ChipErase ()
+void DataFlash_APM1::ChipErase(void (*delay_cb)(unsigned long))
 {
 
   dataflash_CS_active();     // activate dataflash command decoder
@@ -306,7 +306,9 @@ void DataFlash_APM1::ChipErase ()
 
   dataflash_CS_inactive();               //initiate flash page erase
   dataflash_CS_active();
-  while(!ReadStatus());
+  while (!ReadStatus()) {
+      delay_cb(1);
+  }
 
   dataflash_CS_inactive();   // deactivate dataflash command decoder
 }

libraries/DataFlash/DataFlash_APM1.h

@@ -19,7 +19,7 @@ class DataFlash_APM1 : public DataFlash_Class
 	unsigned char ReadStatus();
 	uint16_t PageSize();
 	void PageErase (uint16_t PageAdr);
-	void ChipErase ();
+	void ChipErase(void (*delay_cb)(unsigned long));
 
   public:
 

libraries/DataFlash/DataFlash_APM2.cpp

@@ -350,7 +350,7 @@ void DataFlash_APM2::PageErase (uint16_t PageAdr)
 }
 
 
-void DataFlash_APM2::ChipErase ()
+void DataFlash_APM2::ChipErase(void (*delay_cb)(unsigned long))
 {
 	// activate dataflash command decoder
 	CS_active();
@@ -364,8 +364,11 @@ void DataFlash_APM2::ChipErase ()
 	//initiate flash page erase
 	CS_inactive();
 	CS_active();
-	while(!ReadStatus());
+
+	while(!ReadStatus()) {
+        delay_cb(1);
+    }
 
 	// release SPI bus for use by other sensors
 	CS_inactive();
-}
+}

libraries/DataFlash/DataFlash_APM2.h

@@ -23,7 +23,7 @@ class DataFlash_APM2 : public DataFlash_Class
 	void CS_inactive();
 	void CS_active();
 	void PageErase (uint16_t PageAdr);
-	void ChipErase ();
+	void ChipErase(void (*delay_cb)(unsigned long));
 
   public:
 	DataFlash_APM2(); // Constructor