lib: Add Atmel SAM C21 headers

Signed-off-by: Luke Vuksta <wulfstawulfsta@gmail.com>

lib/samc21/samc21/include/samc21.h

@@ -0,0 +1,70 @@
+/**
+ * \file
+ *
+ * \brief Top header file for SAMC21
+ *
+ * Copyright (c) 2018 Microchip Technology Inc.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the Licence at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _SAMC21_
+#define _SAMC21_
+
+/**
+ * \defgroup SAMC21_definitions SAMC21 Device Definitions
+ * \brief SAMC21 CMSIS Definitions.
+ */
+
+#if   defined(__SAMC21E15A__) || defined(__ATSAMC21E15A__)
+  #include "samc21e15a.h"
+#elif defined(__SAMC21E16A__) || defined(__ATSAMC21E16A__)
+  #include "samc21e16a.h"
+#elif defined(__SAMC21E17A__) || defined(__ATSAMC21E17A__)
+  #include "samc21e17a.h"
+#elif defined(__SAMC21E18A__) || defined(__ATSAMC21E18A__)
+  #include "samc21e18a.h"
+#elif defined(__SAMC21G15A__) || defined(__ATSAMC21G15A__)
+  #include "samc21g15a.h"
+#elif defined(__SAMC21G16A__) || defined(__ATSAMC21G16A__)
+  #include "samc21g16a.h"
+#elif defined(__SAMC21G17A__) || defined(__ATSAMC21G17A__)
+  #include "samc21g17a.h"
+#elif defined(__SAMC21G18A__) || defined(__ATSAMC21G18A__)
+  #include "samc21g18a.h"
+#elif defined(__SAMC21J15A__) || defined(__ATSAMC21J15A__)
+  #include "samc21j15a.h"
+#elif defined(__SAMC21J16A__) || defined(__ATSAMC21J16A__)
+  #include "samc21j16a.h"
+#elif defined(__SAMC21J17A__) || defined(__ATSAMC21J17A__)
+  #include "samc21j17a.h"
+#elif defined(__SAMC21J17AU__) || defined(__ATSAMC21J17AU__)
+  #include "samc21j17au.h"
+#elif defined(__SAMC21J18A__) || defined(__ATSAMC21J18A__)
+  #include "samc21j18a.h"
+#elif defined(__SAMC21J18AU__) || defined(__ATSAMC21J18AU__)
+  #include "samc21j18au.h"
+#else
+  #error Library does not support the specified device.
+#endif
+
+#endif /* _SAMC21_ */