basic usart skeleton

platform/platform.c

@@ -7,12 +7,13 @@
 #include "USB/usb_device.h"
 #include "framework/resources.h"
 #include "framework/unit_registry.h"
-
 #include "units/digital_out/unit_dout.h"
+
 #include "units/digital_in/unit_din.h"
 #include "units/neopixel/unit_neopixel.h"
 #include "units/i2c/unit_i2c.h"
 #include "units/test/unit_test.h"
+#include "units/usart/unit_uart.h"
 #include "units/spi/unit_spi.h"
 
 void plat_init_resources(void)
@@ -79,6 +80,7 @@ void plat_init_resources(void)
     ureg_add_type(&UNIT_NEOPIXEL);
     ureg_add_type(&UNIT_I2C);
     ureg_add_type(&UNIT_SPI);
+    ureg_add_type(&UNIT_USART);
 
     // Free all present resources
     {