eMMC: Support power control pin

Arduino15/packages/SPRESENSE/hardware/spresense/1.0.0/libraries/eMMC/src/eMMC.cpp

@@ -54,6 +54,20 @@
 
 eMMCClass::eMMCClass() : StorageClass(EMMC_MOUNT_POINT), mshandle(NULL)
 {
+  power_pin = 0xff;
+}
+
+boolean eMMCClass::begin(uint8_t pin)
+{
+  power_pin = pin;
+
+  pinMode(power_pin, OUTPUT);
+  digitalWrite(power_pin, HIGH);
+
+  /* device bootup time */
+  delay(5);
+
+  return begin();
 }
 
 boolean eMMCClass::begin()
@@ -62,9 +76,28 @@ boolean eMMCClass::begin()
 
   /* Initialize and mount the eMMC device */
   ret = board_emmc_initialize();
-  if (ret != 0) {
-    return false;
-  }
+  if (ret != 0)
+    {
+      return false;
+    }
+
+  return true;
+}
+
+boolean eMMCClass::end()
+{
+  /* Finalize and unmount the eMMC device */
+  int ret = board_emmc_finalize();
+  if (ret != 0)
+    {
+      return false;
+    }
+
+  if(power_pin != 0xff)
+    {
+      digitalWrite(power_pin, LOW);
+      power_pin = 0xff;
+    }
 
   return true;
 }

Arduino15/packages/SPRESENSE/hardware/spresense/1.0.0/libraries/eMMC/src/eMMC.h

@@ -66,6 +66,25 @@ class eMMCClass : public StorageClass {
    */
   boolean begin();
 
+  /**
+   * @brief  Initialize the eMMC library with Power on PIN
+   *
+   * @details This will check that the eMMC is mounted or not after being initialized it.
+   *          This needs to be called to set up the connection to the eMMC
+   *          before other methods are used.
+   * @param [in] Power control pin for eMMC
+   * @return true if the eMMC is mounted, false if not
+   */
+  boolean begin(uint8_t);
+
+  /**
+   * @brief  Finalize the eMMC library
+   *
+   * @details This function unmount, finalize device and power off device.
+   * @return true if the eMMC finalization complete, false if not
+   */
+  boolean end();
+
   /**
    * @brief Start USB Mass Storage Class
    */
@@ -87,6 +106,7 @@ class eMMCClass : public StorageClass {
 
 private:
   void *mshandle;
+  uint8_t power_pin;
 };
 
 extern eMMCClass eMMC;