testing core part of e54 drivers

arch/arm/SAMD21/SAMD21A/modules/samd21a.emm

@@ -0,0 +1,18 @@
+# eSF Module Manifest
+# The emm format is to make attaching drivers to projects easier.
+# core modules are required modules
+# drivers are optional but are used often
+# libraries are optional and opinionated
+# 	libs speed up development but are not necessary by any means
+
+[core]
+clocks = "core/clocks/clocks.edm"
+power_manager = "core/power_manager/pm.edm"
+
+[drivers]
+usart_sync = "usart/usart_sync/usart_sync.edm"
+usart_async = "usart/usart_async/usart_async.edm"
+usart_dma = "usart/usart_dma/usart_dma.edm"
+
+[libraries]
+

arch/arm/SAMD21/SAMD21A/modules/usart/usart_sync/usart_sync.h

@@ -0,0 +1,10 @@
+#ifndef _USART_SYNC_H_
+#define _USART_SYNC_H_
+
+
+typedef struct usart_sync_t
+{
+	
+}usart_sync_t;
+
+#endif