sim: ft32: add character input port

The FT32 simulator has character output, of course. This patch
adds character input, which lets the simulator run interactive
FT32 applications, e.g. language interpreters.

sim/ft32/ChangeLog

@@ -1,3 +1,7 @@
+2015-09-22  James Bowman  <james.bowman@ftdichip.com>
+
+	* ft32/interp.c (cpu_mem_read): Call getchar when ea is 0x10000.
+
 2015-06-23  Mike Frysinger  <vapier@gentoo.org>
 
 	* configure: Regenerate.

sim/ft32/interp.c

@@ -169,6 +169,8 @@ static uint32_t cpu_mem_read (SIM_DESC sd, uint32_t dw, uint32_t ea)
       /* Simulate some IO devices */
       switch (ea)
 	{
+	case 0x10000:
+	  return getchar ();
 	case 0x1fff4:
 	  /* Read the simulator cycle timer.  */
 	  return cpu->state.cycles / 100;