From 50f19d1d1f0759c12fb3a56a462b695f09b06ee8 Mon Sep 17 00:00:00 2001
From: Alexandre Abadie <alexandre.abadie@inria.fr>
Date: Thu, 27 Sep 2018 13:22:49 +0200
Subject: [PATCH] drivers/periph_eeprom: add clear and erase functions

---
 drivers/include/periph/eeprom.h | 19 +++++++++++++++++++
 drivers/periph_common/eeprom.c  | 15 +++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/include/periph/eeprom.h b/drivers/include/periph/eeprom.h
index affdf13572..d7617ea1ea 100644
--- a/drivers/include/periph/eeprom.h
+++ b/drivers/include/periph/eeprom.h
@@ -79,6 +79,25 @@ void eeprom_write_byte(uint32_t pos, uint8_t data);
  */
 size_t eeprom_write(uint32_t pos, const uint8_t *data, size_t len);
 
+/**
+ * @brief   Clear @p len bytes from the given position @p pos
+ *
+ * Clearing a byte in EEPROM simply consists in setting it to 0
+ *
+ * @param[in] pos       start position in eeprom
+ * @param[in] len       the number of bytes to clear
+ *
+ * @return the number of bytes cleared
+ */
+size_t eeprom_clear(uint32_t pos, size_t len);
+
+/**
+ * @brief   Erase the whole EEPROM content
+ *
+ * @return the EEPROM_SIZE
+ */
+size_t eeprom_erase(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/drivers/periph_common/eeprom.c b/drivers/periph_common/eeprom.c
index d22c512701..35ec3aeaaf 100644
--- a/drivers/periph_common/eeprom.c
+++ b/drivers/periph_common/eeprom.c
@@ -40,4 +40,19 @@ void eeprom_write_byte(uint32_t pos, uint8_t byte)
     eeprom_write(pos, &byte, 1);
 }
 
+size_t eeprom_clear(uint32_t pos, size_t len)
+{
+    assert(pos + len <= EEPROM_SIZE);
+
+    for (size_t i = 0; i < len; i++) {
+        eeprom_write_byte(pos++, 0);
+    }
+
+    return len;
+}
+
+size_t eeprom_erase(void)
+{
+    return eeprom_clear(0, EEPROM_SIZE);
+}
 #endif