hc32f460: Add support for hc32f460 micro-controllers

Signed-off-by: Steven Gotthardt <gotthardt@gmail.com>

src/hc32f460/main.c

@@ -0,0 +1,28 @@
+// Code to setup clocks on Huada HC32F460
+//
+// Copyright (C) 2022  Steven Gotthardt <gotthardt@gmail.com>
+//
+// This file may be distributed under the terms of the GNU GPLv3 license.
+
+#include "autoconf.h" // CONFIG_MACH_AVR
+#include "sched.h"
+#include "system_hc32f460.h"
+
+
+/****************************************************************
+ * Startup
+ ****************************************************************/
+
+// Main entry point - called from armcm_boot.c:ResetHandler()
+void  __attribute__((noreturn))
+armcm_main(void)
+{
+    // sets the system clock speed variable for library use
+    SystemInit();
+
+    // manage the system
+    sched_main();
+
+    // never get here
+    for (;;)  ;
+}