storage: Add hasData method

2 files changed, 15 insertions, 0 deletions

diff --git a/src/storage.cc b/src/storage.cc
index 7ee5f4c..98a90f0 100644
--- a/src/storage.cc
+++ b/src/storage.cc
@@ -190,6 +190,14 @@ void Storage::reset()
 	i2c_write(0, 1, &num_anims);
 }
 
+bool Storage::hasData()
+{
+	// Unprogrammed EEPROM pages always read 0xff
+	if (num_anims == 0xff)
+		return false;
+	return true;
+}
+
 void Storage::load(uint16_t idx, uint8_t *data)
 {
 	uint8_t page_offset;
diff --git a/src/storage.h b/src/storage.h
index b2a4dbf..5366ed9 100644
--- a/src/storage.h
+++ b/src/storage.h
@@ -40,6 +40,13 @@ class Storage {
 		void reset();
 
 		/**
+		 * Checks whether the EEPROM contains animathion data.
+		 *
+		 * @return true if the EEPROm contains valid-looking data
+		 */
+		bool hasData();
+
+		/**
 		 * Load pattern from EEPROM.
 		 *
 		 * @param idx pattern index