From 46aaec7ba04fb27e6a93a3b4eb23c89cb65d41f8 Mon Sep 17 00:00:00 2001
From: Nathan Hartman <hartman.nathan@gmail.com>
Date: Sun, 29 Sep 2019 12:52:20 -0600
Subject: [PATCH] Fix minor typos in docs and comments.

---
 ChangeLog                                        | 16 ++++++++--------
 Documentation/NXGraphicsSubsystem.html           |  4 ++--
 Documentation/NuttxPortingGuide.html             |  6 +++---
 Documentation/NuttxUserGuide.html                |  2 +-
 ReleaseNotes                                     |  8 ++++----
 TODO                                             |  4 ++--
 arch/arm/src/armv6-m/Toolchain.defs              |  2 +-
 arch/arm/src/armv6-m/up_svcall.c                 |  2 +-
 arch/arm/src/armv7-a/arm_addrenv.c               |  4 ++--
 arch/arm/src/armv7-m/up_svcall.c                 |  2 +-
 arch/arm/src/c5471/c5471_watchdog.c              |  2 +-
 arch/arm/src/dm320/dm320_timerisr.c              |  2 +-
 arch/arm/src/imx1/imx_spi.c                      |  2 +-
 arch/arm/src/imx6/imx_ecspi.c                    |  2 +-
 arch/arm/src/kinetis/kinetis_rtc.c               |  2 +-
 arch/arm/src/lpc43xx/lpc43_ethernet.c            |  2 +-
 arch/arm/src/nuc1xx/nuc_lowputc.c                |  2 +-
 arch/arm/src/sama5/sam_tsd.c                     |  2 +-
 arch/arm/src/samd5e5/sam_clockconfig.c           |  2 +-
 arch/arm/src/stm32/stm32_eth.c                   |  2 +-
 arch/arm/src/stm32/stm32_otgfshost.c             |  2 +-
 arch/arm/src/stm32/stm32_otghshost.c             |  2 +-
 arch/arm/src/stm32/stm32_rtcc.c                  |  2 +-
 arch/arm/src/stm32/stm32f40xxx_rtcc.c            |  2 +-
 arch/arm/src/stm32f7/stm32_ethernet.c            |  2 +-
 arch/arm/src/stm32f7/stm32_otghost.c             |  2 +-
 arch/arm/src/stm32f7/stm32_rtc.c                 |  2 +-
 arch/arm/src/stm32h7/stm32_ethernet.c            |  2 +-
 arch/arm/src/stm32h7/stm32_otghost.c             |  2 +-
 arch/arm/src/stm32h7/stm32_rtc.c                 |  2 +-
 arch/arm/src/stm32l4/stm32l4_otgfshost.c         |  2 +-
 arch/arm/src/stm32l4/stm32l4x3xx_rcc.c           |  2 +-
 arch/arm/src/stm32l4/stm32l4x6xx_rcc.c           |  2 +-
 arch/arm/src/stm32l4/stm32l4xrxx_rcc.c           |  2 +-
 arch/arm/src/str71x/str71x_head.S                |  4 ++--
 arch/arm/src/tiva/common/tiva_ssi.c              |  2 +-
 arch/arm/src/tiva/tm4c/tm4c_ethernet.c           |  2 +-
 arch/mips/src/mips32/up_swint0.c                 |  4 ++--
 arch/misoc/src/lm32/lm32_swint.c                 |  4 ++--
 arch/misoc/src/minerva/minerva_swint.c           |  6 +++---
 arch/risc-v/src/rv32im/Toolchain.defs            |  4 ++--
 arch/risc-v/src/rv32im/up_swint.c                |  4 ++--
 arch/z16/src/z16f/z16f_timerisr.c                |  2 +-
 arch/z80/src/z180/z180_mmu.c                     |  6 +++---
 audio/pcm_decode.c                               |  2 +-
 boards/Kconfig                                   |  2 +-
 boards/arm/cxd56xx/spresense/src/cxd56_ioctl.c   |  2 +-
 .../stm32/mikroe-stm32f4/src/stm32_touchscreen.c |  2 +-
 boards/arm/stm32/stm32f4discovery/README.txt     |  4 ++--
 boards/boardctl.c                                |  4 ++--
 .../pic32mx/pic32mx7mmb/src/pic32_touchscreen.c  |  2 +-
 drivers/input/ads7843e.c                         |  2 +-
 drivers/input/max11802.c                         |  2 +-
 drivers/net/enc28j60.c                           |  2 +-
 drivers/net/slip.c                               |  4 ++--
 drivers/usbhost/Kconfig                          |  2 +-
 fs/cromfs/README.txt                             |  2 +-
 fs/smartfs/smartfs_utils.c                       |  2 +-
 fs/vfs/fs_rename.c                               |  2 +-
 fs/vfs/fs_unlink.c                               |  2 +-
 include/nuttx/arch.h                             | 10 +++++-----
 include/nuttx/sensors/adxl372.h                  |  8 ++++----
 include/nuttx/sensors/lsm330.h                   |  8 ++++----
 include/sys/boardctl.h                           |  2 +-
 libs/libnx/nxfonts/README.txt                    |  2 +-
 sched/task/task_delete.c                         |  2 +-
 tools/kconfig2html.c                             |  2 +-
 67 files changed, 104 insertions(+), 104 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b125a38b3b..bd79a12623 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3335,7 +3335,7 @@
 	  the UDP discovery utility.  Contributed by Max Holtzberg.
 	* mm/README.txt:  Add a new README file.
 	* include/nuttx/usb/usb.h, arch/*/src/*usb.c, and arch/*/src/*otg*.c:
-	  Add hooks to to use common, external DMA buffer allocation
+	  Add hooks to use common, external DMA buffer allocation
 	  implementation.
 	* net/recvfrom.c: Don't block in recvfrom if (1) read-ahead buffering
 	  is enabled and (2) some data was obtained from read-ahead buffers.
@@ -3924,7 +3924,7 @@
 	  locking up the whole system.
 	* sched/sched_waitpid.c:  Use SIGCHLD instead of a semaphore.  This
 	  is a much more spec-compliant implementation.  However, there are
-	  some issues with overruning signals because NuttX does not support
+	  some issues with overrunning signals because NuttX does not support
 	  queueing of signals (POSIX does not require it).  I think it may
 	  need to.
 	* sched/sched_waitid.c and sched_wait.c:  Add support for waitid()
@@ -4442,7 +4442,7 @@
 	  type as the second parameter (2013-03-23).
 	* arch/arm/src/lm, kinetis, lpc43, and nuc1xx:  Add kernel build
 	  support to all ARMv7-M and ARMv6-M chips.  There are no
-	  configurations in place to to verify these additions!
+	  configurations in place to verify these additions!
 	  (2013-03-24).
 	* arch/arm/src/lm/lm_gpio.h:  Correct typos in alternate function
 	  definitions (2013-03-24).
@@ -8429,7 +8429,7 @@
 	  addresses to physical addresses, and vice versa (2104-9-7).
 	* SAM3X/Arduino Due: Fix typo in sam3x_periphclks.h; add SCLK
 	  definitions to board.h header file.  From Fabien Comte (2014-9-8).
-	* Several pthread interfaces: Add const storage class to to phthread
+	* Several pthread interfaces: Add const storage class to the phthread
 	  parameters.  From Freddie Chopin (2014-9-8).
 	* libc/math: Corrected atan2 implementations from Denis Arnst (2014-9-8).
 	* sama5d4-ek/knsh:  Rename the kernel configuration to knsh to better
@@ -12026,9 +12026,9 @@
 	* STM32F7: Add SPI, I2C, and ADC drivers.  From Lok Tep (2016-06-15).
 	* err(), warn(), info(), and alert() renamed to include leading '_'.
 	  This was done to avoid some naming collisions (2-06-16
-	* STM32: Move backup domain reset to to earlier in the initialization
+	* STM32: Move backup domain reset to earlier in the initialization
 	  sequence (stm32_rcc.c() in order to avoid disabling LSE during RTC
-	  initialiation.  From Alan Carvalho de Assis (2016-06-16).
+	  initialization.  From Alan Carvalho de Assis (2016-06-16).
 	* SYSLOG: syslog() will now automatically redirect output to lowsyslog()
 	  if called from an interrupt handler (2016-06-16).
 	* STM32: When configuring a GPIO via stm32_configgpio() the function
@@ -16638,7 +16638,7 @@
 	  because current data structures do not support it (2017-08-29).
 	* Networking:  Clean up some naming that has bothered me for a long
 	  time... There are no interrupts and no interrupt handlers in the
-	  network.  There are events and event handler (there used to to be
+	  network.  There are events and event handler (there used to be
 	  interrupt logic in there years ago but that is long, long gone)
 	  (2017-08-29).
 	* configs: update STM32L4 configs for ADC changes.  From Juha Niskanen
@@ -24932,7 +24932,7 @@
 	* arch/arm/src/am335x/am335x_sysclk.c:  Add a function to return a
 	  frequency of the system clock.  From Gregory Nutt (2019-07-08).
 	* arch/arm/src/am335x/am335x_lcdc.c:  Add logic to get/set the module
-	  reference clock.  Still one more clocking interface to to.  From Gregory
+	  reference clock.  Still one more clocking interface to do.  From Gregory
 	  Nutt (2019-07-08).
 	* configs/beaglebone-black/lcd/defconfig:  Add a configuration for bringing
 	  up the LCDC driver.  From Gregory Nutt (2019-07-08).
diff --git a/Documentation/NXGraphicsSubsystem.html b/Documentation/NXGraphicsSubsystem.html
index d22e778e16..a4684731e2 100644
--- a/Documentation/NXGraphicsSubsystem.html
+++ b/Documentation/NXGraphicsSubsystem.html
@@ -1037,7 +1037,7 @@ int nxmu_start(int display, int plane);
 </p>
 <p>
   <b>Returned Value:</b>
-  On success zero (<code>OK</code) is returned; -1 (<code>ERROR</code>) is returned on failure with the <code>errno</code> variable to to indicate the nature of the failure.
+  On success zero (<code>OK</code) is returned; -1 (<code>ERROR</code>) is returned on failure with the <code>errno</code> variable set to indicate the nature of the failure.
 </p>
 
 <h3>2.3.4 <a name="nxcallbacks">NX Server Callbacks</a></h3>
@@ -4088,7 +4088,7 @@ enum nx_fontid_e
 </ol>
 <p>
   New Add the font to the NX build system.
-  There are several files that you have to modify to to this.
+  There are several files that you have to modify to do this.
   Look how the build system uses the font CONFIG_NXFONT_SANS23X27 for examaples:
 </p>
 <ol start="5">
diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index 6f306fbf64..334e6c720b 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -3717,7 +3717,7 @@ void lpwork_restorepriority(uint8_t reqprio);
 </ul>
 <p><b>Description</b>:</p>
 <ul>
-  After an address environment has been established for a task (via <code>up_addrenv_create())</code>, this function may be called to to instantiate that address environment in the virtual address space.
+  After an address environment has been established for a task (via <code>up_addrenv_create())</code>, this function may be called to instantiate that address environment in the virtual address space.
   This might be necessary, for example, to load the code for the task from a file or to access address environment private data.
 </ul>
 <p><b>Input Parameters</b>:</p>
@@ -3742,7 +3742,7 @@ void lpwork_restorepriority(uint8_t reqprio);
 <p><b>Description</b>:</p>
 <ul>
   After an address environment has been temporarily instantiated by <code>up_addrenv_select</code>,
-  this function may be called to to restore the original address environment.
+  this function may be called to restore the original address environment.
 </ul>
 <p><b>Input Parameters</b>:</p>
 <ul>
@@ -4161,7 +4161,7 @@ void nxsched_timer_expiration(void);
 <p><b>Returned Value</b>:</p>
 <ul>
   On success zero (<code>OK</code>) is returned;
-  -1 (<code>ERROR</code>) is returned on failure with the <code>errno</code> variable to to indicate the nature of the failure.
+  -1 (<code>ERROR</code>) is returned on failure with the <code>errno</code> variable set to indicate the nature of the failure.
 </ul>
 
 <h4><a name="boardsmp">4.10 Symmetric Multiprocessing (SMP) Application Interface</a></h4>
diff --git a/Documentation/NuttxUserGuide.html b/Documentation/NuttxUserGuide.html
index 89a20468ac..949573a8b1 100644
--- a/Documentation/NuttxUserGuide.html
+++ b/Documentation/NuttxUserGuide.html
@@ -484,7 +484,7 @@ int task_delete(pid_t pid);
 </p>
 <p>
   The logic in this function only deletes non-running tasks.
-  If the  <code>pid</code> parameter refers to to the currently runing task, then processing is redirected to <code>exit()</code>.
+  If the <code>pid</code> parameter refers to the currently running task, then processing is redirected to <code>exit()</code>.
   This can only happen if a task calls <code>task_delete()</code> in order to delete itself.
 </p>
 <p>
diff --git a/ReleaseNotes b/ReleaseNotes
index 88a2bcb6af..7af34909f6 100644
--- a/ReleaseNotes
+++ b/ReleaseNotes
@@ -4295,8 +4295,8 @@ Additional new features and extended functionality:
     * STM32:
 
       - Added an option to conditionally disable the "wfi" sleep mode.  This
-        is needed with certain JTAG debuggers to to prevent the debug
-        session from begin disconnected (from Ken Pettit).
+        is needed with certain JTAG debuggers to prevent the debug session
+        from being disconnected (from Ken Pettit).
       - Added support for the STM32L (STM32L15X/STM32L16x) family.
       - Added STM32F103C4 and F103C8 chip support (from Laurent Latil).
       - Added a new interface function, stm32_dmacapable() that can be used
@@ -6060,7 +6060,7 @@ Bugfixes (see the ChangeLog for details).  Some of these are very important:
     * NuttShell (NSH):
 
       - Use strncpy vs strcpy in the Telnet console logic to avoid
-        overruning the username and password buffers (from Bertold Van den
+        overrunning the username and password buffers (from Bertold Van den
         Bergh).
       - Add a newline after printing the file in the 'cat' command.  This
         prevents the NSH prompt from be in the same line as the final line
@@ -11651,7 +11651,7 @@ detailed bugfix information):
         From Konstantin Berezenko.
       - STM32 F1-F4: Correct the CAN2 RX IRQ number for stm32f10xx chips.
         From Konstantin Berezenko.
-      - STM32 F1-F4: Move backup domain reset to to earlier in the
+      - STM32 F1-F4: Move backup domain reset to earlier in the
         initialization sequence (stm32_rcc.c() in order to avoid disabling
         LSE during RTC initialiation.  From Alan Carvalho de Assis.
       - STM32 F1-F4: When configuring a GPIO via stm32_configgpio() the
diff --git a/TODO b/TODO
index fa665ced80..52e7140c28 100644
--- a/TODO
+++ b/TODO
@@ -789,7 +789,7 @@ o Signals (sched/signal, arch/)
                  up_schedule_sigaction())
                - up_sigdeliver() is a trampoline function that performs the
                  actual signal action as well as some housekeeping functions
-                 then 
+                 then
                - up_sigdeliver() performs a context switch back to the normal,
                  uninterrupted thread instead of returning to nxsig_deliver().
 
@@ -1218,7 +1218,7 @@ o C++ Support
                   one task can effect another task. There can only one
                   uClibc++ state and it will be shared by all tasks. uClibc++
                   apparently relies on global instances (at least for cin and
-                  cout) there is no way to to have any unique state for any
+                  cout) there is no way to have any unique state for any
                   "task group".
 
                   [NuttX does not support processes because in order to have
diff --git a/arch/arm/src/armv6-m/Toolchain.defs b/arch/arm/src/armv6-m/Toolchain.defs
index dfe5b9c9fd..3ebaf1aa6c 100644
--- a/arch/arm/src/armv6-m/Toolchain.defs
+++ b/arch/arm/src/armv6-m/Toolchain.defs
@@ -186,6 +186,6 @@ ifeq ($(CONFIG_ARMV6M_TOOLCHAIN),GNU_EABIW)
 endif
 
 # Individual tools may limit the optimizatin level but, by default, the
-# optimization level will be set to to -Os
+# optimization level will be set to -Os
 
 MAXOPTIMIZATION ?= -Os
diff --git a/arch/arm/src/armv6-m/up_svcall.c b/arch/arm/src/armv6-m/up_svcall.c
index d2b5b9cf12..f964248cbc 100644
--- a/arch/arm/src/armv6-m/up_svcall.c
+++ b/arch/arm/src/armv6-m/up_svcall.c
@@ -222,7 +222,7 @@ int up_svcall(int irq, FAR void *context, FAR void *arg)
        *
        * In this case, we do both: We save the context registers to the save
        * register area reference by the saved contents of R1 and then set
-       * CURRENT_REGS to to the save register area referenced by the saved
+       * CURRENT_REGS to the save register area referenced by the saved
        * contents of R2.
        */
 
diff --git a/arch/arm/src/armv7-a/arm_addrenv.c b/arch/arm/src/armv7-a/arm_addrenv.c
index 64828a28c8..a40abd6571 100644
--- a/arch/arm/src/armv7-a/arm_addrenv.c
+++ b/arch/arm/src/armv7-a/arm_addrenv.c
@@ -482,7 +482,7 @@ ssize_t up_addrenv_heapsize(FAR const group_addrenv_t *addrenv)
  *
  * Description:
  *   After an address environment has been established for a task group (via
- *   up_addrenv_create().  This function may be called to to instantiate
+ *   up_addrenv_create().  This function may be called to instantiate
  *   that address environment in the virtual address space.  this might be
  *   necessary, for example, to load the code for the task group from a file or
  *   to access address environment private data.
@@ -620,7 +620,7 @@ int up_addrenv_select(FAR const group_addrenv_t *addrenv,
  *
  * Description:
  *   After an address environment has been temporarily instantiated by
- *   up_addrenv_select(), this function may be called to to restore the
+ *   up_addrenv_select(), this function may be called to restore the
  *   original address environment.
  *
  * Input Parameters:
diff --git a/arch/arm/src/armv7-m/up_svcall.c b/arch/arm/src/armv7-m/up_svcall.c
index c0e782cd2e..50897568cb 100644
--- a/arch/arm/src/armv7-m/up_svcall.c
+++ b/arch/arm/src/armv7-m/up_svcall.c
@@ -219,7 +219,7 @@ int up_svcall(int irq, FAR void *context, FAR void *arg)
        *
        * In this case, we do both: We save the context registers to the save
        * register area reference by the saved contents of R1 and then set
-       * CURRENT_REGS to to the save register area referenced by the saved
+       * CURRENT_REGS to the save register area referenced by the saved
        * contents of R2.
        */
 
diff --git a/arch/arm/src/c5471/c5471_watchdog.c b/arch/arm/src/c5471/c5471_watchdog.c
index b4d1ff4f23..806851ca6b 100644
--- a/arch/arm/src/c5471/c5471_watchdog.c
+++ b/arch/arm/src/c5471/c5471_watchdog.c
@@ -76,7 +76,7 @@
 #define CLOCK_KHZ              47500
 #define CLOCK_MHZx2            95
 
-/* Macros to manage access to to watchdog timer macros */
+/* Macros to manage access to the watchdog timer */
 
 #define c5471_wdt_cntl  (*(volatile uint32_t*)C5471_TIMER0_CTRL)
 #define c5471_wdt_count (*(volatile uint32_t*)C5471_TIMER0_CNT)
diff --git a/arch/arm/src/dm320/dm320_timerisr.c b/arch/arm/src/dm320/dm320_timerisr.c
index 3838e7d442..50abbceb70 100644
--- a/arch/arm/src/dm320/dm320_timerisr.c
+++ b/arch/arm/src/dm320/dm320_timerisr.c
@@ -82,7 +82,7 @@
 /* System Timer
  *
  * Timer0 is dedicated as the system timer.  The rate of system timer
- * interrupts is assumed to to 10MS per tick / 100Hz. The following
+ * interrupts is assumed to be 10MS per tick / 100Hz. The following
  * register settings are used for timer 0
  *
  * System clock formula:
diff --git a/arch/arm/src/imx1/imx_spi.c b/arch/arm/src/imx1/imx_spi.c
index a37b8b3b4d..c9af7513c8 100644
--- a/arch/arm/src/imx1/imx_spi.c
+++ b/arch/arm/src/imx1/imx_spi.c
@@ -395,7 +395,7 @@ static int spi_performtx(struct imx_spidev_s *priv)
                priv->txword(priv);
             }
 
-          /* Update the count of words to to transferred */
+          /* Update the count of words to be transferred */
 
           priv->ntxwords -= ntxd;
         }
diff --git a/arch/arm/src/imx6/imx_ecspi.c b/arch/arm/src/imx6/imx_ecspi.c
index c068f2e579..a679b4a3f3 100644
--- a/arch/arm/src/imx6/imx_ecspi.c
+++ b/arch/arm/src/imx6/imx_ecspi.c
@@ -520,7 +520,7 @@ static int spi_performtx(struct imx_spidev_s *priv)
                priv->txword(priv);
             }
 
-          /* Update the count of words to to transferred */
+          /* Update the count of words to be transferred */
 
           priv->ntxwords -= ntxd;
         }
diff --git a/arch/arm/src/kinetis/kinetis_rtc.c b/arch/arm/src/kinetis/kinetis_rtc.c
index 3617cd095f..e5a15f731d 100644
--- a/arch/arm/src/kinetis/kinetis_rtc.c
+++ b/arch/arm/src/kinetis/kinetis_rtc.c
@@ -320,7 +320,7 @@ int up_rtc_initialize(void)
 #ifdef KINETIS_RTC_GEN2
       /* Check if the one-time initialization of the RTC has already been
        * performed. We can determine this by checking if the magic number
-       * has been writing to to back-up date register DR0.
+       * has been written to the back-up date register DR0.
        */
 
       regval = getreg32(KINETIS_RTC_MCLR);
diff --git a/arch/arm/src/lpc43xx/lpc43_ethernet.c b/arch/arm/src/lpc43xx/lpc43_ethernet.c
index d9f845ad85..520ea4953f 100644
--- a/arch/arm/src/lpc43xx/lpc43_ethernet.c
+++ b/arch/arm/src/lpc43xx/lpc43_ethernet.c
@@ -870,7 +870,7 @@ static inline uint8_t *lpc43_allocbuffer(FAR struct lpc43_ethmac_s *priv)
 
 static inline void lpc43_freebuffer(FAR struct lpc43_ethmac_s *priv, uint8_t *buffer)
 {
-  /* Free the buffer by adding it to to the end of the free buffer list */
+  /* Free the buffer by adding it to the end of the free buffer list */
 
   sq_addlast((FAR sq_entry_t *)buffer, &priv->freeb);
 }
diff --git a/arch/arm/src/nuc1xx/nuc_lowputc.c b/arch/arm/src/nuc1xx/nuc_lowputc.c
index 0ff3e8c525..dcf27628b4 100644
--- a/arch/arm/src/nuc1xx/nuc_lowputc.c
+++ b/arch/arm/src/nuc1xx/nuc_lowputc.c
@@ -332,7 +332,7 @@ void nuc_lowputc(uint32_t ch)
 
   nuc_console_ready();
 
-  /* Then write the character to to the TX FIFO */
+  /* Then write the character to the TX FIFO */
 
   putreg32(ch, NUC_CONSOLE_BASE + NUC_UART_THR_OFFSET);
 #endif /* HAVE_SERIAL_CONSOLE */
diff --git a/arch/arm/src/sama5/sam_tsd.c b/arch/arm/src/sama5/sam_tsd.c
index 91491d27d8..66107631b8 100644
--- a/arch/arm/src/sama5/sam_tsd.c
+++ b/arch/arm/src/sama5/sam_tsd.c
@@ -582,7 +582,7 @@ static void sam_tsd_bottomhalf(void *arg)
     {
       /* If we have not yet processed the last pen up event, then we
        * cannot handle this pen down event. We will have to discard it.  That
-       * should be okay because we will set the timer to to sample again
+       * should be okay because we will set the timer to sample again
        * a little later.  NOTE that pen interrupts are not re-enabled in
        * this case; we rely on the timer expiry to get us going again.
        */
diff --git a/arch/arm/src/samd5e5/sam_clockconfig.c b/arch/arm/src/samd5e5/sam_clockconfig.c
index 716d745f15..475ffd4239 100644
--- a/arch/arm/src/samd5e5/sam_clockconfig.c
+++ b/arch/arm/src/samd5e5/sam_clockconfig.c
@@ -828,7 +828,7 @@ static void sam_dfll_gclkready(const struct sam_dfll_config_s *config)
     {
     }
 
-  /* Set the source of GCLK0 to to the configured source. */
+  /* Set the source of GCLK0 to the configured source. */
 
   regval32  = getreg32(SAM_GCLK_GENCTRL(0));
   regval32 &= ~GCLK_GENCTRL_SRC_MASK;
diff --git a/arch/arm/src/stm32/stm32_eth.c b/arch/arm/src/stm32/stm32_eth.c
index f0cf5e7dbd..2f670b9f8b 100644
--- a/arch/arm/src/stm32/stm32_eth.c
+++ b/arch/arm/src/stm32/stm32_eth.c
@@ -978,7 +978,7 @@ static inline uint8_t *stm32_allocbuffer(FAR struct stm32_ethmac_s *priv)
 
 static inline void stm32_freebuffer(FAR struct stm32_ethmac_s *priv, uint8_t *buffer)
 {
-  /* Free the buffer by adding it to to the end of the free buffer list */
+  /* Free the buffer by adding it to the end of the free buffer list */
 
   sq_addlast((FAR sq_entry_t *)buffer, &priv->freeb);
 }
diff --git a/arch/arm/src/stm32/stm32_otgfshost.c b/arch/arm/src/stm32/stm32_otgfshost.c
index 71f316373b..fc358e0c65 100644
--- a/arch/arm/src/stm32/stm32_otgfshost.c
+++ b/arch/arm/src/stm32/stm32_otgfshost.c
@@ -2001,7 +2001,7 @@ static ssize_t stm32_in_transfer(FAR struct stm32_usbhost_s *priv, int chidx,
       else
         {
           /* Successfully received another chunk of data... add that to the
-           * runing total.  Then continue reading until we read 'buflen'
+           * running total.  Then continue reading until we read 'buflen'
            * bytes of data or until the devices NAKs (implying a short
            * packet).
            */
diff --git a/arch/arm/src/stm32/stm32_otghshost.c b/arch/arm/src/stm32/stm32_otghshost.c
index a20a2e881a..ca5b71dae9 100644
--- a/arch/arm/src/stm32/stm32_otghshost.c
+++ b/arch/arm/src/stm32/stm32_otghshost.c
@@ -2006,7 +2006,7 @@ static ssize_t stm32_in_transfer(FAR struct stm32_usbhost_s *priv, int chidx,
       else
         {
           /* Successfully received another chunk of data... add that to the
-           * runing total.  Then continue reading until we read 'buflen'
+           * running total.  Then continue reading until we read 'buflen'
            * bytes of data or until the devices NAKs (implying a short
            * packet).
            */
diff --git a/arch/arm/src/stm32/stm32_rtcc.c b/arch/arm/src/stm32/stm32_rtcc.c
index b5dad05a6b..418fb5d3ec 100644
--- a/arch/arm/src/stm32/stm32_rtcc.c
+++ b/arch/arm/src/stm32/stm32_rtcc.c
@@ -638,7 +638,7 @@ int up_rtc_initialize(void)
 
   /* Check if the one-time initialization of the RTC has already been
    * performed. We can determine this by checking if the magic number
-   * has been writing to to back-up date register DR0.
+   * has been written to the back-up date register DR0.
    */
 
   if (regval != RTC_MAGIC && regval != RTC_MAGIC_TIME_SET)
diff --git a/arch/arm/src/stm32/stm32f40xxx_rtcc.c b/arch/arm/src/stm32/stm32f40xxx_rtcc.c
index 94558c98b3..780462e1a9 100644
--- a/arch/arm/src/stm32/stm32f40xxx_rtcc.c
+++ b/arch/arm/src/stm32/stm32f40xxx_rtcc.c
@@ -1035,7 +1035,7 @@ int up_rtc_initialize(void)
 
   /* Check if the one-time initialization of the RTC has already been
    * performed. We can determine this by checking if the magic number
-   * has been writing to to back-up date register DR0.
+   * has been written to the back-up date register DR0.
    */
 
   if (regval != RTC_MAGIC && regval != RTC_MAGIC_TIME_SET)
diff --git a/arch/arm/src/stm32f7/stm32_ethernet.c b/arch/arm/src/stm32f7/stm32_ethernet.c
index 67ecc93ba5..a909ea52b7 100644
--- a/arch/arm/src/stm32f7/stm32_ethernet.c
+++ b/arch/arm/src/stm32f7/stm32_ethernet.c
@@ -993,7 +993,7 @@ static inline uint8_t *stm32_allocbuffer(struct stm32_ethmac_s *priv)
 
 static inline void stm32_freebuffer(struct stm32_ethmac_s *priv, uint8_t *buffer)
 {
-  /* Free the buffer by adding it to to the end of the free buffer list */
+  /* Free the buffer by adding it to the end of the free buffer list */
 
   sq_addlast((sq_entry_t *)buffer, &priv->freeb);
 }
diff --git a/arch/arm/src/stm32f7/stm32_otghost.c b/arch/arm/src/stm32f7/stm32_otghost.c
index 3a1fe41220..d29acc2ed6 100644
--- a/arch/arm/src/stm32f7/stm32_otghost.c
+++ b/arch/arm/src/stm32f7/stm32_otghost.c
@@ -1999,7 +1999,7 @@ static ssize_t stm32_in_transfer(FAR struct stm32_usbhost_s *priv, int chidx,
       else
         {
           /* Successfully received another chunk of data... add that to the
-           * runing total.  Then continue reading until we read 'buflen'
+           * running total.  Then continue reading until we read 'buflen'
            * bytes of data or until the devices NAKs (implying a short
            * packet).
            */
diff --git a/arch/arm/src/stm32f7/stm32_rtc.c b/arch/arm/src/stm32f7/stm32_rtc.c
index c7d8219a78..f7d7234fa6 100644
--- a/arch/arm/src/stm32f7/stm32_rtc.c
+++ b/arch/arm/src/stm32f7/stm32_rtc.c
@@ -1047,7 +1047,7 @@ int up_rtc_initialize(void)
 
   /* Check if the one-time initialization of the RTC has already been
    * performed. We can determine this by checking if the magic number
-   * has been writing to to back-up date register DR0.
+   * has been written to the back-up date register DR0.
    */
 
   if (regval != RTC_MAGIC && regval != RTC_MAGIC_TIME_SET)
diff --git a/arch/arm/src/stm32h7/stm32_ethernet.c b/arch/arm/src/stm32h7/stm32_ethernet.c
index b66a8731f4..4f29f91945 100644
--- a/arch/arm/src/stm32h7/stm32_ethernet.c
+++ b/arch/arm/src/stm32h7/stm32_ethernet.c
@@ -994,7 +994,7 @@ static inline uint8_t *stm32_allocbuffer(struct stm32_ethmac_s *priv)
 static inline void stm32_freebuffer(struct stm32_ethmac_s *priv,
                                     uint8_t *buffer)
 {
-  /* Free the buffer by adding it to to the end of the free buffer list */
+  /* Free the buffer by adding it to the end of the free buffer list */
 
   sq_addlast((sq_entry_t *)buffer, &priv->freeb);
 }
diff --git a/arch/arm/src/stm32h7/stm32_otghost.c b/arch/arm/src/stm32h7/stm32_otghost.c
index 60fcbdef39..78499a533a 100644
--- a/arch/arm/src/stm32h7/stm32_otghost.c
+++ b/arch/arm/src/stm32h7/stm32_otghost.c
@@ -2004,7 +2004,7 @@ static ssize_t stm32_in_transfer(FAR struct stm32_usbhost_s *priv, int chidx,
       else
         {
           /* Successfully received another chunk of data... add that to the
-           * runing total.  Then continue reading until we read 'buflen'
+           * running total.  Then continue reading until we read 'buflen'
            * bytes of data or until the devices NAKs (implying a short
            * packet).
            */
diff --git a/arch/arm/src/stm32h7/stm32_rtc.c b/arch/arm/src/stm32h7/stm32_rtc.c
index 15f4e79ef3..4af11daedc 100644
--- a/arch/arm/src/stm32h7/stm32_rtc.c
+++ b/arch/arm/src/stm32h7/stm32_rtc.c
@@ -1047,7 +1047,7 @@ int up_rtc_initialize(void)
 
   /* Check if the one-time initialization of the RTC has already been
    * performed. We can determine this by checking if the magic number
-   * has been writing to to back-up date register DR0.
+   * has been written to back-up date register DR0.
    */
 
   if (regval != RTC_MAGIC && regval != RTC_MAGIC_TIME_SET)
diff --git a/arch/arm/src/stm32l4/stm32l4_otgfshost.c b/arch/arm/src/stm32l4/stm32l4_otgfshost.c
index a58433a6e6..dbea969705 100644
--- a/arch/arm/src/stm32l4/stm32l4_otgfshost.c
+++ b/arch/arm/src/stm32l4/stm32l4_otgfshost.c
@@ -2005,7 +2005,7 @@ static ssize_t stm32l4_in_transfer(FAR struct stm32l4_usbhost_s *priv,
       else
         {
           /* Successfully received another chunk of data... add that to the
-           * runing total.  Then continue reading until we read 'buflen'
+           * running total.  Then continue reading until we read 'buflen'
            * bytes of data or until the devices NAKs (implying a short
            * packet).
            */
diff --git a/arch/arm/src/stm32l4/stm32l4x3xx_rcc.c b/arch/arm/src/stm32l4/stm32l4x3xx_rcc.c
index e84253cdf2..d1127a39fe 100644
--- a/arch/arm/src/stm32l4/stm32l4x3xx_rcc.c
+++ b/arch/arm/src/stm32l4/stm32l4x3xx_rcc.c
@@ -950,7 +950,7 @@ static inline void rcc_enableperipherals(void)
   rcc_enableapb2();
 
 #ifdef STM32L4_USE_HSI48
-  /* Enable HSI48 clocking to to support USB transfers or RNG */
+  /* Enable HSI48 clocking to support USB transfers or RNG */
 
   stm32l4_enable_hsi48(STM32L4_HSI48_SYNCSRC);
 #endif
diff --git a/arch/arm/src/stm32l4/stm32l4x6xx_rcc.c b/arch/arm/src/stm32l4/stm32l4x6xx_rcc.c
index 60098e47bd..7111a8a184 100644
--- a/arch/arm/src/stm32l4/stm32l4x6xx_rcc.c
+++ b/arch/arm/src/stm32l4/stm32l4x6xx_rcc.c
@@ -1018,7 +1018,7 @@ static inline void rcc_enableperipherals(void)
   rcc_enableapb2();
 
 #ifdef STM32L4_USE_HSI48
-  /* Enable HSI48 clocking to to support USB transfers or RNG */
+  /* Enable HSI48 clocking to support USB transfers or RNG */
 
   stm32l4_enable_hsi48(STM32L4_HSI48_SYNCSRC);
 #endif
diff --git a/arch/arm/src/stm32l4/stm32l4xrxx_rcc.c b/arch/arm/src/stm32l4/stm32l4xrxx_rcc.c
index 6c2c12d9a1..60f4126d2f 100644
--- a/arch/arm/src/stm32l4/stm32l4xrxx_rcc.c
+++ b/arch/arm/src/stm32l4/stm32l4xrxx_rcc.c
@@ -995,7 +995,7 @@ static inline void rcc_enableperipherals(void)
   rcc_enableapb2();
 
 #ifdef STM32L4_USE_HSI48
-  /* Enable HSI48 clocking to to support USB transfers or RNG */
+  /* Enable HSI48 clocking to support USB transfers or RNG */
 
   stm32l4_enable_hsi48(STM32L4_HSI48_SYNCSRC);
 #endif
diff --git a/arch/arm/src/str71x/str71x_head.S b/arch/arm/src/str71x/str71x_head.S
index 767f646142..afe9466dca 100644
--- a/arch/arm/src/str71x/str71x_head.S
+++ b/arch/arm/src/str71x/str71x_head.S
@@ -260,7 +260,7 @@
  * Description:
  *   The EIC is initialized for use with NuttX.  This initialization does not
  *   take advantage of the high performance capabilities of the EIC.  Instead,
- *   The EIC is only used to to provide NuttX IRQ numbers.  Here is what is
+ *   The EIC is only used to provide NuttX IRQ numbers.  Here is what is
  *   done:
  *
  *     IRQs and FIQs are disabled
@@ -340,7 +340,7 @@ eicloop:
 	 */
 
 	cmp		\irqno, #STR71X_EIC_NCHANNELS
-	blt		eicloop	
+	blt		eicloop
 	.endm
 
 /*****************************************************************************
diff --git a/arch/arm/src/tiva/common/tiva_ssi.c b/arch/arm/src/tiva/common/tiva_ssi.c
index 08cbcf53de..57e8f82923 100644
--- a/arch/arm/src/tiva/common/tiva_ssi.c
+++ b/arch/arm/src/tiva/common/tiva_ssi.c
@@ -699,7 +699,7 @@ static int ssi_performtx(struct tiva_ssidev_s *priv)
                priv->txword(priv);
             }
 
-          /* Update the count of words to to transferred */
+          /* Update the count of words to be transferred */
 
           priv->ntxwords -= ntxd;
         }
diff --git a/arch/arm/src/tiva/tm4c/tm4c_ethernet.c b/arch/arm/src/tiva/tm4c/tm4c_ethernet.c
index 71c4a97025..68d83f475e 100644
--- a/arch/arm/src/tiva/tm4c/tm4c_ethernet.c
+++ b/arch/arm/src/tiva/tm4c/tm4c_ethernet.c
@@ -978,7 +978,7 @@ static inline uint8_t *tiva_allocbuffer(FAR struct tiva_ethmac_s *priv)
 
 static inline void tiva_freebuffer(FAR struct tiva_ethmac_s *priv, uint8_t *buffer)
 {
-  /* Free the buffer by adding it to to the end of the free buffer list */
+  /* Free the buffer by adding it to the end of the free buffer list */
 
   sq_addlast((FAR sq_entry_t *)buffer, &priv->freeb);
 }
diff --git a/arch/mips/src/mips32/up_swint0.c b/arch/mips/src/mips32/up_swint0.c
index 40cc800592..67b2278b69 100644
--- a/arch/mips/src/mips32/up_swint0.c
+++ b/arch/mips/src/mips32/up_swint0.c
@@ -183,8 +183,8 @@ int up_swint0(int irq, FAR void *context, FAR void *arg)
        *   R6 = restoreregs
        *
        * In this case, we save the context registers to the save register
-       * area reference by the saved contents of R5 and then set
-       * g_current_regs to to the save register area referenced by the saved
+       * area referenced by the saved contents of R5 and then set
+       * g_current_regs to the save register area referenced by the saved
        * contents of R6.
        */
 
diff --git a/arch/misoc/src/lm32/lm32_swint.c b/arch/misoc/src/lm32/lm32_swint.c
index 3f5aeb73cd..54e17dc150 100644
--- a/arch/misoc/src/lm32/lm32_swint.c
+++ b/arch/misoc/src/lm32/lm32_swint.c
@@ -184,8 +184,8 @@ int lm32_swint(int irq, FAR void *context, FAR void *arg)
        *   A2 = restoreregs
        *
        * In this case, we save the context registers to the save register
-       * area reference by the saved contents of R5 and then set
-       * g_current_regs to to the save register area referenced by the saved
+       * area referenced by the saved contents of R5 and then set
+       * g_current_regs to the save register area referenced by the saved
        * contents of R6.
        */
 
diff --git a/arch/misoc/src/minerva/minerva_swint.c b/arch/misoc/src/minerva/minerva_swint.c
index 98cc6d3a7c..4404cbae60 100644
--- a/arch/misoc/src/minerva/minerva_swint.c
+++ b/arch/misoc/src/minerva/minerva_swint.c
@@ -176,9 +176,9 @@ int minerva_swint(int irq, FAR void *context, FAR void *arg)
       /* A0=SYS_switch_context: This a switch context command: void
        * up_switchcontext(uint32_t *saveregs, uint32_t *restoreregs); At this
        * point, the following values are saved in context: A0 =
-       * SYS_switch_context A1 = saveregs A2 = restoreregs In this case, we
-       * save the context registers to the save register area reference by the
-       * saved contents of R5 and then set g_current_regs to to the save
+       * SYS_switch_context A1 = saveregs A2 = restoreregs. In this case, we
+       * save the context registers to the save register area referenced by
+       * the saved contents of R5 and then set g_current_regs to the save
        * register area referenced by the saved contents of R6.
        */
 
diff --git a/arch/risc-v/src/rv32im/Toolchain.defs b/arch/risc-v/src/rv32im/Toolchain.defs
index 28827918c8..6fab51473e 100644
--- a/arch/risc-v/src/rv32im/Toolchain.defs
+++ b/arch/risc-v/src/rv32im/Toolchain.defs
@@ -105,8 +105,8 @@ ifeq ($(CONFIG_RISCV_TOOLCHAIN),GNU_RISCY)
   ARCHCPUFLAGS = -march=rv32imcxgap8 -mPE=8 -mFC=1 -D__riscv__ -D__pulp__ -D__GAP8__
 endif
 
-# Individual tools may limit the optimizatin level but, by default, the
-# optimization level will be set to to -Os
+# Individual tools may limit the optimization level but, by default, the
+# optimization level will be set to -Os
 
 ifeq ($(CONFIG_DEBUG_SYMBOLS),)
 MAXOPTIMIZATION ?= -Os
diff --git a/arch/risc-v/src/rv32im/up_swint.c b/arch/risc-v/src/rv32im/up_swint.c
index 1ba8c73bbd..e1b8dca8ad 100644
--- a/arch/risc-v/src/rv32im/up_swint.c
+++ b/arch/risc-v/src/rv32im/up_swint.c
@@ -181,8 +181,8 @@ int up_swint(int irq, FAR void *context, FAR void *arg)
        *   A2 = restoreregs
        *
        * In this case, we save the context registers to the save register
-       * area reference by the saved contents of R5 and then set
-       * g_current_regs to to the save register area referenced by the saved
+       * area referenced by the saved contents of R5 and then set
+       * g_current_regs to the save register area referenced by the saved
        * contents of R6.
        */
 
diff --git a/arch/z16/src/z16f/z16f_timerisr.c b/arch/z16/src/z16f/z16f_timerisr.c
index aaaa04f7ed..0e49e66a96 100644
--- a/arch/z16/src/z16f/z16f_timerisr.c
+++ b/arch/z16/src/z16f/z16f_timerisr.c
@@ -148,7 +148,7 @@ void z16_timer_initialize(void)
    *  scaledfreq   = 20,000,000 / 100
    *               = 200,000
    *  divisor      = ((18,432,000 / 100) >> 16) + 1
-   *               = 3 -> 4 (need to to up to next power of two)
+   *               = 3 -> 4 (need to go up to next power of two)
    *  reload_value = 20,000,000 / 100 / 4
    *               = 56,080
    */
diff --git a/arch/z80/src/z180/z180_mmu.c b/arch/z80/src/z180/z180_mmu.c
index 8af556b58f..1c02041649 100644
--- a/arch/z80/src/z180/z180_mmu.c
+++ b/arch/z80/src/z180/z180_mmu.c
@@ -419,7 +419,7 @@ ssize_t up_addrenv_heapsize(FAR const group_addrenv_t *addrenv)
  *
  * Description:
  *   After an address environment has been established for a task (via
- *   up_addrenv_create()), this function may be called to to instantiate
+ *   up_addrenv_create()), this function may be called to instantiate
  *   that address environment in the virtual address space.  This might be
  *   necessary, for example, to load the code for the task from a file or
  *   to access address environment private data.
@@ -463,8 +463,8 @@ int up_addrenv_select(FAR const group_addrenv_t *addrenv,
  * Name: up_addrenv_restore
  *
  * Description:
- *   After an address environment has been temporarilty instantiated by
- *   up_addrenv_select, this function may be called to to restore the
+ *   After an address environment has been temporarily instantiated by
+ *   up_addrenv_select, this function may be called to restore the
  *   original address environment.
  *
  * Input Parameters:
diff --git a/audio/pcm_decode.c b/audio/pcm_decode.c
index 6aa6579a5f..60896be33c 100644
--- a/audio/pcm_decode.c
+++ b/audio/pcm_decode.c
@@ -1335,7 +1335,7 @@ static void pcm_callback(FAR void *arg, uint16_t reason,
 
   DEBUGASSERT(priv && priv->export.upper);
 
-  /* The buffer belongs to to an upper level.  Just forward the event to
+  /* The buffer belongs to an upper level.  Just forward the event to
    * the next level up.
    */
 
diff --git a/boards/Kconfig b/boards/Kconfig
index 9668b77158..4a72808d08 100644
--- a/boards/Kconfig
+++ b/boards/Kconfig
@@ -1871,7 +1871,7 @@ config ARCH_BOARD_CUSTOM_DIR
 		to also tell the build system where it can find the board directory
 		for the custom board.
 
-		In this case, the board directory is assume to lie outside the
+		In this case, the board directory is assumed to lie outside the
 		NuttX directory.  The provided path must then be a full, absolute
 		path to some location outside of the NuttX source tree (like
 		"~/projects/myboard").
diff --git a/boards/arm/cxd56xx/spresense/src/cxd56_ioctl.c b/boards/arm/cxd56xx/spresense/src/cxd56_ioctl.c
index 960e16b35b..014fd4ca91 100644
--- a/boards/arm/cxd56xx/spresense/src/cxd56_ioctl.c
+++ b/boards/arm/cxd56xx/spresense/src/cxd56_ioctl.c
@@ -80,7 +80,7 @@
  *
  * Returned Value:
  *   On success zero (OK) is returned; -1 (ERROR) is returned on failure
- *   with the errno variable to to indicate the nature of the failure.
+ *   with the errno variable to indicate the nature of the failure.
  *
  ****************************************************************************/
 
diff --git a/boards/arm/stm32/mikroe-stm32f4/src/stm32_touchscreen.c b/boards/arm/stm32/mikroe-stm32f4/src/stm32_touchscreen.c
index 2b83f41940..1f8d5dcc72 100644
--- a/boards/arm/stm32/mikroe-stm32f4/src/stm32_touchscreen.c
+++ b/boards/arm/stm32/mikroe-stm32f4/src/stm32_touchscreen.c
@@ -677,7 +677,7 @@ static int tc_waitsample(FAR struct tc_dev_s *priv,
 {
   int ret;
 
-  /* Pre-emption must be disabled when this is called to to prevent sampled
+  /* Pre-emption must be disabled when this is called to prevent sampled
    * data from changing until it has been reported.
    */
 
diff --git a/boards/arm/stm32/stm32f4discovery/README.txt b/boards/arm/stm32/stm32f4discovery/README.txt
index 4d245dc4cf..f70d7d5d43 100644
--- a/boards/arm/stm32/stm32f4discovery/README.txt
+++ b/boards/arm/stm32/stm32f4discovery/README.txt
@@ -1383,7 +1383,7 @@ Configuration Sub-directories
        executable in PATH variable (see apps/examples/README.txt)
 
     5. This configuration can be extended to use the hello++4 example and to
-       build uClibc with the following additions to to the configuration file
+       build uClibc with the following additions to the configuration file
        (from Leo aloe3132):
 
        CONFIG_C99_BOOL8=y
@@ -1439,7 +1439,7 @@ Configuration Sub-directories
 
        You may also want to reconfigure the serial console to USART1.
 
-    2. The HCI UART is assume to connect to the UART3 on the following pins:
+    2. The HCI UART is assumed to connect to the UART3 on the following pins:
 
          USART3 TX :  PB10
          USART3 RX :  PB11
diff --git a/boards/boardctl.c b/boards/boardctl.c
index 65b438cdb1..31ba396f73 100644
--- a/boards/boardctl.c
+++ b/boards/boardctl.c
@@ -89,7 +89,7 @@
  *
  * Returned Value:
  *   On success zero (OK) is returned; -1 (ERROR) is returned on failure
- *   with the errno variable to to indicate the nature of the failure.
+ *   with the errno variable to indicate the nature of the failure.
  *
  ****************************************************************************/
 
@@ -258,7 +258,7 @@ static inline int boardctl_usbdevctrl(FAR struct boardioc_usbdev_ctrl_s *ctrl)
  *
  * Returned Value:
  *   On success zero (OK) is returned; -1 (ERROR) is returned on failure
- *   with the errno variable to to indicate the nature of the failure.
+ *   with the errno variable to indicate the nature of the failure.
  *
  ****************************************************************************/
 
diff --git a/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c b/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c
index 38cbf0eccb..c7c1d50ce0 100644
--- a/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c
+++ b/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c
@@ -578,7 +578,7 @@ static int tc_waitsample(FAR struct tc_dev_s *priv,
 {
   int ret;
 
-  /* Pre-emption must be disabled when this is called to to prevent sampled
+  /* Pre-emption must be disabled when this is called to prevent sampled
    * data from changing until it has been reported.
    */
 
diff --git a/drivers/input/ads7843e.c b/drivers/input/ads7843e.c
index eb25551eb2..9ff3f9b10a 100644
--- a/drivers/input/ads7843e.c
+++ b/drivers/input/ads7843e.c
@@ -595,7 +595,7 @@ static void ads7843e_worker(FAR void *arg)
     {
       /* If we have not yet processed the last pen up event, then we
        * cannot handle this pen down event. We will have to discard it.  That
-       * should be okay because we will set the timer to to sample again
+       * should be okay because we will set the timer to sample again
        * later.
        */
 
diff --git a/drivers/input/max11802.c b/drivers/input/max11802.c
index 901a7594a6..bfc32cc6e7 100644
--- a/drivers/input/max11802.c
+++ b/drivers/input/max11802.c
@@ -578,7 +578,7 @@ static void max11802_worker(FAR void *arg)
     {
       /* If we have not yet processed the last pen up event, then we
        * cannot handle this pen down event. We will have to discard it.
-       * That should be okay because we will set the timer to to sample
+       * That should be okay because we will set the timer to sample
        * again later.
        */
 
diff --git a/drivers/net/enc28j60.c b/drivers/net/enc28j60.c
index bbd0332cf7..7d73aa9784 100644
--- a/drivers/net/enc28j60.c
+++ b/drivers/net/enc28j60.c
@@ -1582,7 +1582,7 @@ static void enc_pktif(FAR struct enc_driver_s *priv)
       priv->dev.d_len = pktlen - 4;
 
       /* Copy the data data from the receive buffer to priv->dev.d_buf.
-       * ERDPT should be correctly positioned from the last call to to
+       * ERDPT should be correctly positioned from the last call to
        * end_rdbuffer (above).
        */
 
diff --git a/drivers/net/slip.c b/drivers/net/slip.c
index 447e7e1f19..12dff74ba1 100644
--- a/drivers/net/slip.c
+++ b/drivers/net/slip.c
@@ -554,8 +554,8 @@ static inline void slip_receive(FAR struct slip_driver_s *priv)
 {
   uint8_t ch;
 
-  /* Copy the data data from the hardware to to the RX buffer until we
-   * put together a whole packet. Make sure not to copy them into the
+  /* Copy the data from the hardware to the RX buffer until we put
+   * together a whole packet. Make sure not to copy them into the
    * packet if we run out of room.
    */
 
diff --git a/drivers/usbhost/Kconfig b/drivers/usbhost/Kconfig
index 07e695b02f..8598087115 100644
--- a/drivers/usbhost/Kconfig
+++ b/drivers/usbhost/Kconfig
@@ -202,7 +202,7 @@ config USBHOST_CDCACM_TXDELAY
 	default 200
 	---help---
 		When the appellation is inactive, the host must poll it at this
-		rate in order to discover if it has serial data to send to to the
+		rate in order to discover if it has serial data to send to the
 		device.
 
 config USBHOST_CDCACM_NPREALLOC
diff --git a/fs/cromfs/README.txt b/fs/cromfs/README.txt
index 35b4bb81bd..b122367606 100644
--- a/fs/cromfs/README.txt
+++ b/fs/cromfs/README.txt
@@ -155,7 +155,7 @@ block can be converted to an absolute address in the in-memory CROMFS image
 by simply adding that offset to the well-known address of the volume header.
 
 Each hard link, directory, and file node in the directory list includes
-such a "peer offset" to to the next node in the list.  Each node is followed
+such a "peer offset" to the next node in the list.  Each node is followed
 by the NUL-terminated name of the node.  Each node also holds an additional
 offset.  Directory nodes contain a "child offset".  That is, the offset to
 the first entry in another singly linked list of nodes comprising the sub-
diff --git a/fs/smartfs/smartfs_utils.c b/fs/smartfs/smartfs_utils.c
index 20436d4478..cb6e6e2af5 100644
--- a/fs/smartfs/smartfs_utils.c
+++ b/fs/smartfs/smartfs_utils.c
@@ -1659,7 +1659,7 @@ errout:
  * Name: smartfs_shrinkfile
  *
  * Description:
- *   Shrink the size existing file to to the specified length
+ *   Shrink the size of an existing file to the specified length
  *
  ****************************************************************************/
 
diff --git a/fs/vfs/fs_rename.c b/fs/vfs/fs_rename.c
index 627abba7a9..8a421c834d 100644
--- a/fs/vfs/fs_rename.c
+++ b/fs/vfs/fs_rename.c
@@ -263,7 +263,7 @@ next_subdir:
    *
    * Remove the old inode.  Because we hold a reference count on the
    * inode, it will not be deleted now.  It will be deleted when all of
-   * the references to to the inode have been released (perhaps when
+   * the references to the inode have been released (perhaps when
    * inode_release() is called in remove()).  inode_remove() should return
    * -EBUSY to indicate that the inode was not deleted now.
    */
diff --git a/fs/vfs/fs_unlink.c b/fs/vfs/fs_unlink.c
index c5f958de57..0cbd0785b6 100644
--- a/fs/vfs/fs_unlink.c
+++ b/fs/vfs/fs_unlink.c
@@ -199,7 +199,7 @@ int unlink(FAR const char *pathname)
 
           /* Remove the old inode.  Because we hold a reference count on the
            * inode, it will not be deleted now.  It will be deleted when all
-           * of the references to to the inode have been released (perhaps
+           * of the references to the inode have been released (perhaps
            * when inode_release() is called below).  inode_remove() will
            * return -EBUSY to indicate that the inode was not deleted now.
            */
diff --git a/include/nuttx/arch.h b/include/nuttx/arch.h
index 938c1be590..7733619d0a 100644
--- a/include/nuttx/arch.h
+++ b/include/nuttx/arch.h
@@ -967,10 +967,10 @@ ssize_t up_addrenv_heapsize(FAR const group_addrenv_t *addrenv);
  *
  * Description:
  *   After an address environment has been established for a task group (via
- *   up_addrenv_create().  This function may be called to to instantiate
- *   that address environment in the virtual address space.  this might be
- *   necessary, for example, to load the code for the task group from a file or
- *   to access address environment private data.
+ *   up_addrenv_create().  This function may be called to instantiate
+ *   that address environment in the virtual address space.  This might be
+ *   necessary, for example, to load the code for the task group from a file
+ *   or to access address environment private data.
  *
  * Input Parameters:
  *   addrenv - The representation of the task address environment previously
@@ -997,7 +997,7 @@ int up_addrenv_select(FAR const group_addrenv_t *addrenv,
  *
  * Description:
  *   After an address environment has been temporarily instantiated by
- *   up_addrenv_select(), this function may be called to to restore the
+ *   up_addrenv_select(), this function may be called to restore the
  *   original address environment.
  *
  * Input Parameters:
diff --git a/include/nuttx/sensors/adxl372.h b/include/nuttx/sensors/adxl372.h
index d86701d9a7..41b76462ba 100644
--- a/include/nuttx/sensors/adxl372.h
+++ b/include/nuttx/sensors/adxl372.h
@@ -58,11 +58,11 @@
  *   The Low Pass Filter is enabled and the High Pass Filter is disabled.
  *   A filter settling time of 370ms is selected.
  *
- * If the user desires a different configuration settings, the the user may
+ * If the user desires different configuration settings, then the user may
  * either provide a pointer to an array of "struct adxl372_reg_pair_s" that
- * will be applied to to the sensor upon open(); or dynamically use
- * the lseek() and write() file_operations functions to set the
- * sensor configuration as desired.
+ * will be applied to the sensor upon open(); or dynamically use the lseek()
+ * and write() file_operations functions to set the sensor configuration as
+ * desired.
  *
  * When using the sensor from the file_operations interface, the sensor is
  * accessed in Programmed I/O (PIO) mode. (i.e. When the read() function is
diff --git a/include/nuttx/sensors/lsm330.h b/include/nuttx/sensors/lsm330.h
index 5a65b1a388..efad364d68 100644
--- a/include/nuttx/sensors/lsm330.h
+++ b/include/nuttx/sensors/lsm330.h
@@ -64,11 +64,11 @@
  *   Range = 500 dps.
  *   Low Pass Filter #1 selected.
  *
- * If the user desires a different configuration settings, the the user may
+ * If the user desires different configuration settings, then the user may
  * either provide a pointer to an array of "struct lsm330_reg_pair_s" that
- * will be applied to to the sensor upon open(); or dynamically use the
- * lseek() and write() file_operations functions to set the sensor
- * configuration as desired.
+ * will be applied to the sensor upon open(); or dynamically use the lseek()
+ * and write() file_operations functions to set the sensor configuration
+ * as desired.
  *
  * When using the sensor from the file_operations interface, the sensor is
  * accessed in Programmed I/O (PIO) mode. (i.e. When the read() function is
diff --git a/include/sys/boardctl.h b/include/sys/boardctl.h
index c0d200a236..9c61bf16e2 100644
--- a/include/sys/boardctl.h
+++ b/include/sys/boardctl.h
@@ -367,7 +367,7 @@ extern "C"
  *
  * Returned Value:
  *   On success zero (OK) is returned; -1 (ERROR) is returned on failure
- *   with the errno variable to to indicate the nature of the failure.
+ *   with the errno variable set to indicate the nature of the failure.
  *
  ****************************************************************************/
 
diff --git a/libs/libnx/nxfonts/README.txt b/libs/libnx/nxfonts/README.txt
index 457d290fd0..25be637269 100644
--- a/libs/libnx/nxfonts/README.txt
+++ b/libs/libnx/nxfonts/README.txt
@@ -56,7 +56,7 @@ Installing New Fonts
        ...
 
   New Add the font to the NX build system.  There are several files that
-  you have to modify to to this.  Look how the build system uses the
+  you have to modify to do this.  Look how the build system uses the
   font CONFIG_NXFONT_SANS23X27 for examaples:
 
     5. nuttx/graphics/Makefile.  This file needs logic to auto-generate
diff --git a/sched/task/task_delete.c b/sched/task/task_delete.c
index 54d4526b20..b566f1885f 100644
--- a/sched/task/task_delete.c
+++ b/sched/task/task_delete.c
@@ -63,7 +63,7 @@
  *   function.
  *
  *   The logic in this function only deletes non-running tasks.  If the
- *   'pid' parameter refers to to the currently runing task, then processing
+ *   'pid' parameter refers to the currently running task, then processing
  *   is redirected to exit().  This can only happen if a task calls
  *   task_delete()in order to delete itself.
  *
diff --git a/tools/kconfig2html.c b/tools/kconfig2html.c
index f9655b0377..d6afe9ba2c 100644
--- a/tools/kconfig2html.c
+++ b/tools/kconfig2html.c
@@ -987,7 +987,7 @@ static char *get_html_string(void)
   pend = findchar(pbegin, '"');
   if (pend)
     {
-      /* Replace the final quote with a NUL.  g_lnptr is set to to
+      /* Replace the final quote with a NUL.  g_lnptr is set to
        * the next valid character after the terminating quote.
        */