The USB HID mouse driver is now functional. There are some usage issues as described in the top-level TODO list

ChangeLog

@@ -6553,4 +6553,8 @@
 	  completely untested on initial check-in (2014-2-9).
 	* configs/olimex-lpc1766stk/src/lpc17_hidmouse.c and hidmouse: Add
 	  support of a test of the USB HID mouse (2014-2-9).
-
+	* drivers/usbhost/usbhost_hidmouse.c: The driver appears to be
+	  functional.  But there are usability issues:  How do you use the
+	  mouse with no cursor?  The HID mouse currently emulates a touchscreen
+	  driver.  That would work in the long run for several reasons (see the
+	  top-level TODO list for details) (2014-2-9).

TODO

@@ -16,7 +16,7 @@ nuttx/
   (4)  C++ Support
   (6)  Binary loaders (binfmt/)
  (17)  Network (net/, drivers/net)
-  (4)  USB (drivers/usbdev, drivers/usbhost)
+  (5)  USB (drivers/usbdev, drivers/usbhost)
  (11)  Libraries (libc/, )
  (12)  File system/Generic drivers (fs/, drivers/)
   (5)  Graphics subystem (graphics/)
@@ -1025,6 +1025,26 @@ o USB (drivers/usbdev, drivers/usbhost)
   Status:      Open
   Priority:    Low/Unknown.  This is a feature enhancement.
 
+  Title:       USB HID MOUSE LOGIC INCOMPLETE
+  Description: There is a working USB HID mouse driver at drivers/usbhost/usbhost_hidmouse.c.
+               Although the driver works, it is not useful.  Currently it
+               emulates a touchscreen and uses the touchscreen interface.
+               The problems are:
+
+                 - With no hardware cursor, a mouse is not usable because
+                   you cannot tell where the mouse is positioned.
+                 - Since it uses the touchscreen interface, there is no way
+                   to report left or center button activity or to report
+                   the wheel position.
+                 - And, for the same reason, positional data is not reported
+                   when the left button is not pressed (i.e., like touching
+                   the screen).  Data would have to be reported when no
+                   buttons are pressed in order to driver a hardware cursor.
+
+               There is a test configuration at configs/olimex-lpc1766stk/hidmouse.
+  Status:      Open
+  Priority:    Low, unless you need a usable HID mouse now.
+
 o Libraries (libc/)
   ^^^^^^^^^^^^^^^^^
 

configs/olimex-lpc1766stk/README.txt

@@ -958,9 +958,9 @@ Where <subdir> is one of the following:
        CONFIG_WINDOWS_CYGWIN=y                 : Cygwin environment on Windows
        CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery under Windows
 
-    3. The mouse is really useless with no display and not cursor.  So this
+    3. The mouse is really useless with no display and no cursor.  So this
-       configuration is only suited for testing.  It is also awkward to use.
+       configuration is only suited for low-level testing.  It is also awkward
-       Here are the steps:
+       to use.  Here are the steps:
 
        - Remove the USB HID mouse and reset the board.
        - When the NSH prompt comes up type 'tc'.  That will fail, but it

configs/olimex-lpc1766stk/hidmouse/defconfig

@@ -407,7 +407,6 @@ CONFIG_USBHOST_NPREALLOC=4
 # CONFIG_USBHOST_MSC is not set
 # CONFIG_USBHOST_HIDKBD is not set
 CONFIG_USBHOST_HIDMOUSE=y
-CONFIG_HIDMOUSE_POLLUSEC=100000
 CONFIG_HIDMOUSE_DEFPRIO=50
 CONFIG_HIDMOUSE_STACKSIZE=1024
 CONFIG_HIDMOUSE_BUFSIZE=64

drivers/usbhost/Kconfig

@@ -157,6 +157,7 @@ config HIDMOUSE_SWAPXY
 	default n
 	---help---
 		Reverse the meaning of X and Y to handle different display orientations.
+		NOTE:  All of the following settings apply AFTER X and Y have been swapped.
 
 config HIDMOUSE_XMAX
 	int "Maximum X position"
@@ -178,24 +179,30 @@ config HIDMOUSE_XSCALE
 	hex "X scaling factor"
 	default 0x00010000
 	---help---
-		Mouse positions are accumumated from X/Y displacements reported by
+		Mouse positions are accumulated from X/Y displacements reported by
 		the mouse device. This setting provides a scaling value for the X
 		displacement.  This is a fixed precision floating point number with
 		16 bits of fraction.  So a value of 0x00010000 is 1.0, 0x00018000
 		is 1.5, 0x00024000 is 2.25, etc.
 
+		NOTE that a negative value of HIDMOUSE_XSCALE such as 0xffff0000
+		(-1.0) can be used to change the direction of movement.
+
 		Default: 0x00010000 (1.0)
 
 config HIDMOUSE_YSCALE
 	hex "Y scaling factor"
 	default 0x00010000
 	---help---
-		Mouse positions are accumumated from X/Y displacements reported by
+		Mouse positions are accumulated from X/Y displacements reported by
 		the mouse device. This setting provides a scaling value for the Y
 		displacement.  This is a fixed precision floating point number with
 		16 bits of fraction.  So a value of 0x00010000 is 1.0, 0x00018000
 		is 1.5, 0x00024000 is 2.25, etc.
 
+		NOTE that a negative value of HIDMOUSE_YSCALE such as 0xffff0000
+		(-1.0) can be used to change the direction of movement.
+
 		Default: 0x00010000 (1.0)
 
 config HIDMOUSE_XTHRESH

drivers/usbhost/usbhost_hidmouse.c

@@ -228,8 +228,8 @@ struct usbhost_state_s
   sem_t                   exclsem;      /* Used to maintain mutual exclusive access */
   sem_t                   waitsem;      /* Used to wait for mouse data */
   FAR uint8_t            *tbuffer;      /* The allocated transfer buffer */
-  b16_t                   xpos;         /* Current integrated X position */
+  b16_t                   xaccum;       /* Current integrated X position */
-  b16_t                   ypos;         /* Current integrated Y position */
+  b16_t                   yaccum;       /* Current integrated Y position */
   b16_t                   xlast;        /* Last reported X position */
   b16_t                   ylast;        /* Last reported Y position */
   size_t                  tbuflen;      /* Size of the allocated transfer buffer */
@@ -753,53 +753,67 @@ static int usbhost_mouse_poll(int argc, char *argv[])
            */
 
 #ifdef CONFIG_HIDMOUSE_SWAPXY
+          xdisp = rpt->ydisp;
+          if ((rpt->ydisp & 0x80) != 0)
+            {
+              xdisp |= 0xffffff00;
+            }
+#else
           xdisp = rpt->xdisp;
           if ((rpt->xdisp & 0x80) != 0)
             {
               xdisp |= 0xffffff00;
             }
-#else
-          xdisp = rpt->ydisp;
-          if ((rpt->ydisp & 0x80) != 0)
-            {
-              ydisp |= 0xffffff00;
-            }
 #endif
 
           /* Scale the X displacement and determine the new X position */
 
-          xpos = priv->xpos + CONFIG_HIDMOUSE_XSCALE * xdisp;
+          xpos = priv->xaccum + CONFIG_HIDMOUSE_XSCALE * xdisp;
 
-          /* Make sure that the scaled X position does not exceed the
+          /* Make sure that the scaled X position does not become negative
-           * maximum.
+           * or exceed the maximum.
            */
 
           if (xpos > HIDMOUSE_XMAX_B16)
             {
               xpos = HIDMOUSE_XMAX_B16;
             }
+          else if (xpos < 0)
+            {
+              xpos = 0;
+            }
+
+          /* Save the updated X position */
+
+          priv->xaccum = xpos;
 
           /* Do the same for the Y position */
 
 #ifdef CONFIG_HIDMOUSE_SWAPXY
+          ydisp = rpt->xdisp;
+          if ((rpt->xdisp & 0x80) != 0)
+            {
+              ydisp |= 0xffffff00;
+            }
+#else
           ydisp = rpt->ydisp;
           if ((rpt->ydisp & 0x80) != 0)
             {
               ydisp |= 0xffffff00;
             }
-#else
-          ydisp = rpt->xdisp;
-          if ((rpt->xdisp & 0x80) != 0)
-            {
-              xdisp |= 0xffffff00;
-            }
 #endif
-          ypos = priv->ypos + CONFIG_HIDMOUSE_YSCALE * ydisp;
+          ypos = priv->yaccum + CONFIG_HIDMOUSE_YSCALE * ydisp;
 
           if (ypos > HIDMOUSE_YMAX_B16)
             {
               ypos = HIDMOUSE_YMAX_B16;
             }
+          else if (ypos < 0)
+            {
+              ypos = 0;
+            }
+
+          priv->yaccum = ypos;
 
           /* Check if the left button is pressed */
 
@@ -841,9 +855,9 @@ static int usbhost_mouse_poll(int argc, char *argv[])
 
           else if (priv->sample.event == BUTTON_RELEASED)
             {
-              /* If we have not yet processed the last pen up event, then we
+              /* If we have not yet processed the button release event, then
-               * cannot handle this pen down event. We will have to discard
+               * we cannot handle this button press event. We will have to
-               * it and wait for the next sample data.
+               * discard the data and wait for the next sample.
                */
 
               goto ignored;
@@ -1891,8 +1905,8 @@ static int usbhost_open(FAR struct file *filep)
 
           /* Set the reported position to the center of the range */
 
-          priv->xpos = (CONFIG_HIDMOUSE_XMAX >> 1);
+          priv->xaccum = (HIDMOUSE_XMAX_B16 >> 1);
-          priv->ypos = (CONFIG_HIDMOUSE_YMAX >> 1);
+          priv->yaccum = (HIDMOUSE_YMAX_B16 >> 1);
         }
 
       /* Otherwise, just increment the reference count on the driver */