LPC17 USB Host: Minor clean-up after performing some regressin testing

arch/arm/src/lpc17xx/lpc17_usbhost.c

@@ -1,7 +1,7 @@
 /*******************************************************************************
  * arch/arm/src/lpc17xx/lpc17_usbhost.c
  *
- *   Copyright (C) 2010-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2010-2012, 2014 Gregory Nutt. All rights reserved.
  *   Authors: Rafael Noronha <rafael@pdsolucoes.com.br>
  *            Gregory Nutt <gnutt@nuttx.org>
  *
@@ -44,6 +44,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <semaphore.h>
 #include <string.h>
 #include <errno.h>
@@ -1619,7 +1620,7 @@ static int lpc17_enumerate(FAR struct usbhost_connection_s *conn, int rphndx)
  
   /* USB 2.0 spec says at least 50ms delay before port reset */
 
-  up_mdelay(100);
+  (void)usleep(100*1000);
 
   /* Put RH port 1 in reset (the LPC176x supports only a single downstream port) */
 
@@ -1632,7 +1633,7 @@ static int lpc17_enumerate(FAR struct usbhost_connection_s *conn, int rphndx)
   /* Release RH port 1 from reset and wait a bit */
 
   lpc17_putreg(OHCI_RHPORTST_PRSC, LPC17_USBHOST_RHPORTST1);
-  up_mdelay(200);
+  (void)usleep(200*1000);
 
   /* Let the common usbhost_enumerate do all of the real work.  Note that the
    * FunctionAddress (USB address) is hardcoded to one.

configs/olimex-lpc1766stk/README.txt

@@ -837,16 +837,26 @@ USB host operations.  To make these modifications, do the following:
 1. First configure to build the NSH configuration from the top-level
    NuttX directory:
 
-   cd tools
+     cd tools
-   ./configure nucleus2g/nsh
+     ./configure olimex-lpc1766stk/nsh
-   cd ..
+     cd ..
 
-2. Then edit the top-level .config file to enable USB host.  Make the
+2. Modify the top-level .config file to enable USB host using:
-   following changes:
 
-   CONFIG_LPC17_USBHOST=y
+     make menuconfig
-   CONFIG_USBHOST=y
+
-   CONFIG_SCHED_WORKQUEUE=y
+   Make the following changes:
+
+     System Type -> LPC17xx Peripheral Support
+       CONFIG_LPC17_USBHOST=y
+
+     Device Drivers-> USB Host Driver Support
+       CONFIG_USBHOST=y
+       CONFIG_USBHOST_ISOC_DISABLE=y
+       CONFIG_USBHOST_MSC=y
+
+     Library Routines
+       CONFIG_SCHED_WORKQUEUE=y
 
 When this change is made, NSH should be extended to support USB flash
 devices.  When a FLASH device is inserted, you should see a device

configs/olimex-lpc1766stk/src/lpc17_nsh.c

@@ -157,15 +157,13 @@ static struct usbhost_connection_s *g_usbconn;
 static int nsh_waiter(int argc, char *argv[])
 {
   bool connected = false;
-  int ret;
 
   message("nsh_waiter: Running\n");
   for (;;)
     {
       /* Wait for the device to change state */
 
-      ret = CONN_WAIT(g_usbconn, &connected);
+      DEBUGVERIFY(CONN_WAIT(g_usbconn, &connected));
-      DEBUGASSERT(ret == OK);
 
       connected = !connected;
       message("nsh_waiter: %s\n", connected ? "connected" : "disconnected");