basic button handler routines added, hard buttons tested

touch sensors were also preliminary tested but not all have been analyzed yet.

firmware/linker/ch32x035.ld

@@ -23,6 +23,12 @@ SECTIONS
 		_einit = .;
 	} >FLASH AT>FLASH
 
+	.ramfunclalign : 
+    {       
+        . = ALIGN(4);
+        PROVIDE(_ramfunc_lma = .); 
+    } >FLASH AT>FLASH 
+
   	.vector :
   	{
       *(.vector);
@@ -132,6 +138,9 @@ SECTIONS
     	*(.srodata.cst2)
     	*(.srodata .srodata.*)
     	. = ALIGN(4);
+		*(.ramfunc)
+    	*(.ramfunc*)
+		. = ALIGN(4);
 		PROVIDE( _edata = .);
 	} >RAM AT>FLASH