Merged nuttx/nuttx/master into master

Documentation/README.html

@@ -8,7 +8,7 @@
   <tr align="center" bgcolor="#e4e4e4">
     <td>
       <h1><big><font color="#3c34ec"><i>NuttX README Files</i></font></big></h1>
-      <p>Last Updated: March 21, 2017</p>
+      <p>Last Updated: March 23, 2017</p>
     </td>
   </tr>
 </table>
@@ -68,6 +68,8 @@ nuttx/
  |   |   `- <a href="https://bitbucket.org/nuttx/nuttx/src/master/configs/c5471evm/README.txt" target="_blank"><b><i>README.txt</i></b></a>
  |   |- cc3200-launchpad/
  |   |   `- <a href="https://bitbucket.org/nuttx/nuttx/src/master/configs/cc3200-launchpad/README.txt" target="_blank"><b><i>README.txt</i></b></a>
+ |   |- clicker2-stm32/
+ |   |   `- <a href="https://bitbucket.org/nuttx/nuttx/src/master/configs/clicker2-stm32/README.txt" target="_blank"><b><i>README.txt</i></b></a>
  |   |- cloudctrl/
  |   |   `- <a href="https://bitbucket.org/nuttx/nuttx/src/master/configs/cloudctrl/README.txt" target="_blank"><b><i>README.txt</i></b></a>
  |   |- demo9s12ne64/

README.txt

@@ -1453,6 +1453,8 @@ nuttx/
  |   |   `- README.txt
  |   |- cc3200-launchpad/
  |   |   `- README.txt
+ |   |- clicker2-stm32
+ |   |   `- README.txt
  |   |- cloudctrl
  |   |   `- README.txt
  |   |- demo0s12ne64/

arch/arm/src/stm32/Kconfig

@@ -2629,9 +2629,9 @@ config STM32_FLASH_PREFETCH
 	default y if STM32_STM32F427 || STM32_STM32F429 || STM32_STM32F446
 	default n
 	---help---
-	Enable FLASH prefetch and F2 and F4 parts (FLASH pre-fetch is always enabled
+		Enable FLASH prefetch and F2 and F4 parts (FLASH pre-fetch is always enabled
-	on F1 parts).  Some early revisions of F4 parts do not support FLASH pre-fetch
+		on F1 parts).  Some early revisions of F4 parts do not support FLASH pre-fetch
-	properly and enabling this option may interfere with ADC accuracy.
+		properly and enabling this option may interfere with ADC accuracy.
 
 config STM32_FLASH_WORKAROUND_DATA_CACHE_CORRUPTION_ON_RWW
 	bool "Workaround for FLASH data cache corruption"
@@ -6201,12 +6201,11 @@ config STM32_I2C_DUTY16_9
 config STM32_I2C_DMA
 	bool "I2C DMA Support"
 	default n
-	depends on STM32_I2C && STM32_STM32F40XX && STM32_DMA1
+	depends on STM32_I2C && STM32_STM32F40XX && STM32_DMA1 && !I2C_POLLED
 	---help---
 		This option enables the DMA for I2C transfers.
 		Note: The user can define CONFIG_I2C_DMAPRIO: a custom priority value for the
 		I2C dma streams, else the default priority level is set to medium.
-		Note: This option is compatible with CONFIG_I2C_POLLED.
 
 endmenu
 

arch/arm/src/stm32/chip/stm32_flash.h

@@ -324,10 +324,10 @@
 #    define FLASH_CR_OBL_LAUNCH     (1 << 13) /* Bit 13: Force option byte loading */
 #  endif
 #elif defined(CONFIG_STM32_STM32F20XX) || defined(CONFIG_STM32_STM32F40XX)
-#  define FLASH_CR_PG               (1 << 0)                /* Bit 0: Programming */
+#  define FLASH_CR_PG               (1 << 0)               /* Bit 0: Programming */
-#  define FLASH_CR_SER              (1 << 1)                /* Bit 1: Sector Erase */
+#  define FLASH_CR_SER              (1 << 1)               /* Bit 1: Sector Erase */
-#  define FLASH_CR_MER              (1 << 2)                /* Bit 2: Mass Erase sectors 0..11 */
+#  define FLASH_CR_MER              (1 << 2)               /* Bit 2: Mass Erase sectors 0..11 */
-#  define FLASH_CR_SNB_SHIFT        (3)                     /* Bits 3-6: Sector number */
+#  define FLASH_CR_SNB_SHIFT        (3)                    /* Bits 3-6: Sector number */
 #if defined(CONFIG_STM32_STM32F427) || defined(CONFIG_STM32_STM32F429)
 #    define FLASH_CR_SNB_MASK       (31 << FLASH_CR_SNB_SHIFT)
 #    define FLASH_CR_SNB(n)         (((n % 12) << FLASH_CR_SNB_SHIFT) | ((n / 12) << 7)) /* Sector n, n=0..23 */
@@ -335,19 +335,19 @@
 #    define FLASH_CR_SNB_MASK       (15 << FLASH_CR_SNB_SHIFT)
 #    define FLASH_CR_SNB(n)         ((n) << FLASH_CR_SNB_SHIFT) /* Sector n, n=0..11 */
 #endif
-#  define FLASH_CR_PSIZE_SHIFT      (8)                     /* Bits 8-9: Program size */
+#  define FLASH_CR_PSIZE_SHIFT      (8)                    /* Bits 8-9: Program size */
 #  define FLASH_CR_PSIZE_MASK       (3 << FLASH_CR_PSIZE_SHIFT)
 #    define FLASH_CR_PSIZE_X8       (0 << FLASH_CR_PSIZE_SHIFT) /* 00 program x8 */
 #    define FLASH_CR_PSIZE_X16      (1 << FLASH_CR_PSIZE_SHIFT) /* 01 program x16 */
 #    define FLASH_CR_PSIZE_X32      (2 << FLASH_CR_PSIZE_SHIFT) /* 10 program x32 */
 #    define FLASH_CR_PSIZE_X64      (3 << FLASH_CR_PSIZE_SHIFT) /* 11 program x64 */
-#  define FLASH_CR_STRT             (1 << 16)               /* Bit 16: Start Erase */
+#  define FLASH_CR_STRT             (1 << 16)              /* Bit 16: Start Erase */
-#  define FLASH_CR_EOPIE            (1 << 24)               /* Bit 24: End of operation interrupt enable */
+#  define FLASH_CR_EOPIE            (1 << 24)              /* Bit 24: End of operation interrupt enable */
-#  define FLASH_CR_ERRIE            (1 << 25)               /* Bit 25: Error interrupt enable */
+#  define FLASH_CR_ERRIE            (1 << 25)              /* Bit 25: Error interrupt enable */
-#  define FLASH_CR_LOCK             (1 << 31)               /* Bit 31: Lock */
+#  define FLASH_CR_LOCK             (1 << 31)              /* Bit 31: Lock */
 #endif
 #if defined(CONFIG_STM32_STM32F427) || defined(CONFIG_STM32_STM32F429)
-#  define FLASH_CR_MER1             (1 << 15)               /* Bit 15: Mass Erase sectors 12..23 */
+#  define FLASH_CR_MER1             (1 << 15)              /* Bit 15: Mass Erase sectors 12..23 */
 #endif
 
 /* Flash Option Control Register (OPTCR) */
@@ -375,7 +375,7 @@
 /* Flash Option Control Register (OPTCR1) */
 
 #if defined(CONFIG_STM32_STM32F427) || defined(CONFIG_STM32_STM32F429)
-#  define FLASH_OPTCR1_NWRP_SHIFT    (16)                   /* Bits 16-27: Not write protect (high bank) */
+#  define FLASH_OPTCR1_NWRP_SHIFT    (16)                  /* Bits 16-27: Not write protect (high bank) */
 #  define FLASH_OPTCR1_NWRP_MASK     (0xfff << FLASH_OPTCR_NWRP_SHIFT)
 
 #  define FLASH_OPTCR1_BFB2_SHIFT    (4)                   /* Bits 4: Dual-bank Boot option byte */
@@ -384,7 +384,7 @@
 #endif
 
 #if defined(CONFIG_STM32_STM32F446)
-#  define FLASH_OPTCR1_NWRP_SHIFT    (16)                   /* Bits 16-23: Not write protect (high bank) */
+#  define FLASH_OPTCR1_NWRP_SHIFT    (16)                  /* Bits 16-23: Not write protect (high bank) */
 #  define FLASH_OPTCR1_NWRP_MASK     (0xff << FLASH_OPTCR_NWRP_SHIFT)
 #endif
 

arch/arm/src/stm32/stm32_flash.c

@@ -128,6 +128,7 @@ static void flash_lock(void)
   modifyreg32(STM32_FLASH_CR, 0, FLASH_CR_LOCK);
 }
 
+#if defined(CONFIG_STM32_FLASH_WORKAROUND_DATA_CACHE_CORRUPTION_ON_RWW)
 static void data_cache_disable(void)
 {
   modifyreg32(STM32_FLASH_ACR, FLASH_ACR_DCEN, 0);
@@ -143,6 +144,7 @@ static void data_cache_enable(void)
 
   modifyreg32(STM32_FLASH_ACR, 0, FLASH_ACR_DCEN);
 }
+#endif /* defined(CONFIG_STM32_FLASH_WORKAROUND_DATA_CACHE_CORRUPTION_ON_RWW) */
 
 /************************************************************************************
  * Public Functions
@@ -288,6 +290,7 @@ ssize_t up_progmem_erasepage(size_t page)
 #if !defined(CONFIG_STM32_STM32F40XX)
   if (!(getreg32(STM32_RCC_CR) & RCC_CR_HSION))
     {
+      sem_unlock();
       return -EPERM;
     }
 #endif

arch/arm/src/stm32/stm32_i2c_alt.c

@@ -1204,6 +1204,9 @@ static inline void stm32_i2c_enablefsmc(uint32_t ahbenr)
 
 static int stm32_i2c_isr(struct stm32_i2c_priv_s *priv)
 {
+#ifndef CONFIG_I2C_POLLED
+  uint32_t regval;
+#endif
   uint32_t status;
 
   i2cinfo("I2C ISR called\n");
@@ -1867,7 +1870,6 @@ static int stm32_i2c_isr(struct stm32_i2c_priv_s *priv)
 #else
       /* Clear all interrupts */
 
-      uint32_t regval;
       regval  = stm32_i2c_getreg(priv, STM32_I2C_CR2_OFFSET);
       regval &= ~I2C_CR2_ALLINTS;
       stm32_i2c_putreg(priv, STM32_I2C_CR2_OFFSET, regval);

arch/arm/src/stm32/stm32_qencoder.c

@@ -693,17 +693,17 @@ static int stm32_interrupt(int irq, FAR void *context, FAR void *arg)
   stm32_putreg16(priv, STM32_GTIM_SR_OFFSET, regval & ~GTIM_SR_UIF);
 
   /* Check the direction bit in the CR1 register and add or subtract the
-   * maximum value, as appropriate.
+   * maximum value + 1, as appropriate.
    */
 
   regval = stm32_getreg16(priv, STM32_GTIM_CR1_OFFSET);
   if ((regval & ATIM_CR1_DIR) != 0)
     {
-      priv->position -= (int32_t)0x0000ffff;
+      priv->position -= (int32_t)0x00010000;
     }
    else
     {
-      priv->position += (int32_t)0x0000ffff;
+      priv->position += (int32_t)0x00010000;
     }
 
   return OK;

arch/arm/src/stm32/stm32f40xxx_i2c.c

@@ -1261,6 +1261,15 @@ static int stm32_i2c_isr(struct stm32_i2c_priv_s *priv)
 
   priv->status = status;
 
+  /* Any new message should begin with "Start" condition
+   * Situation priv->msgc == 0 came from DMA RX handler and should be managed
+   */
+
+  if (priv->dcnt == -1 && priv->msgc != 0 && (status & I2C_SR1_SB) == 0)
+    {
+      return OK;
+    }
+
   /* Check if this is a new transmission so to set up the
    * trace table accordingly.
    */
@@ -1516,9 +1525,16 @@ static int stm32_i2c_isr(struct stm32_i2c_priv_s *priv)
 
           status |= (stm32_i2c_getreg(priv, STM32_I2C_SR2_OFFSET) << 16);
 
-          /* Send Stop */
+          /* Send Stop/Restart */
 
-          stm32_i2c_sendstop(priv);
+          if (priv->msgc > 0)
+            {
+              stm32_i2c_sendstart(priv);
+            }
+          else
+            {
+              stm32_i2c_sendstop(priv);
+            }
 
           i2cinfo("Address ACKed beginning data reception\n");
           i2cinfo("short read N=1: programming stop bit\n");
@@ -1828,7 +1844,17 @@ static int stm32_i2c_isr(struct stm32_i2c_priv_s *priv)
         {
           i2cinfo("short read N=2: DR and SR full setting stop bit and reading twice\n");
 
-          stm32_i2c_sendstop(priv);
+          /* Send Stop/Restart */
+
+          if (priv->msgc > 0)
+            {
+              stm32_i2c_sendstart(priv);
+            }
+          else
+            {
+              stm32_i2c_sendstop(priv);
+            }
+
           *priv->ptr++ = stm32_i2c_getreg(priv, STM32_I2C_DR_OFFSET);
           priv->dcnt--;
           *priv->ptr++ = stm32_i2c_getreg(priv, STM32_I2C_DR_OFFSET);
@@ -1905,9 +1931,16 @@ static int stm32_i2c_isr(struct stm32_i2c_priv_s *priv)
 
           stm32_i2c_traceevent(priv, I2CEVENT_READ_3, priv->dcnt);
 
-          /* Program stop */
+          /* Program Stop/Restart */
 
-          stm32_i2c_sendstop(priv);
+          if (priv->msgc > 0)
+            {
+              stm32_i2c_sendstart(priv);
+            }
+          else
+            {
+              stm32_i2c_sendstop(priv);
+            }
 
           /* read dcnt = 2 */
 
@@ -2015,7 +2048,6 @@ static int stm32_i2c_isr(struct stm32_i2c_priv_s *priv)
 #else
       /* Clear all interrupts */
 
-      uint32_t regval;
       regval  = stm32_i2c_getreg(priv, STM32_I2C_CR2_OFFSET);
       regval &= ~I2C_CR2_ALLINTS;
       stm32_i2c_putreg(priv, STM32_I2C_CR2_OFFSET, regval);
@@ -2062,7 +2094,14 @@ static void stm32_i2c_dmarxcallback(DMA_HANDLE handle, uint8_t status, void *arg
    * interrupt routine if enabled.
    */
 
-  stm32_i2c_sendstop(priv);
+  if (priv->msgc > 0)
+    {
+      stm32_i2c_sendstart(priv);
+    }
+  else
+    {
+      stm32_i2c_sendstop(priv);
+    }
 
   /* Let the I2C periph know to stop DMA transfers, also is used by ISR to check
    * if DMA is done.
@@ -2116,10 +2155,6 @@ static void stm32_i2c_dmatxcallback(DMA_HANDLE handle, uint8_t status, void *arg
   regval |= (I2C_CR2_ITERREN | I2C_CR2_ITEVFEN);
   stm32_i2c_putreg(priv, STM32_I2C_CR2_OFFSET, regval);
 #endif
-
-  /* let the ISR routine take care of shutting down or switching to next msg */
-
-  stm32_i2c_isr(priv);
 }
 #endif /* ifdef CONFIG_STM32_I2C_DMA */
 

arch/arm/src/stm32f7/stm32_allocateheap.c

@@ -126,7 +126,7 @@
 #  endif
 #endif
 
-/* There are 4 possible heap configurations:
+/* There are 5 possible heap configurations:
  *
  * Configuration 1. System SRAM1 (only)
  *                  CONFIG_MM_REGIONS == 1

configs/Makefile

@@ -89,7 +89,7 @@ OBJS = $(AOBJS) $(COBJS)
 BIN = libconfigs$(LIBEXT)
 
 all: $(BIN)
-.PHONY: depend ccontext clean_context clean distclean
+.PHONY: depend context clean_context clean distclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)

configs/clicker2-stm32/README.txt

@@ -0,0 +1,251 @@
+README
+======
+
+  This is the README file for the port of NuttX to the Mikroe Clicker2 STM32
+  board based on the STMicro STM32F407VGT6 MCU.
+
+  Reference: https://shop.mikroe.com/development-boards/starter/clicker-2/stm32f4
+
+Contents
+========
+
+  o Serial Console
+  o LEDs
+  o Buttons
+  o Using JTAG
+  o Configurations
+
+Serial Console
+==============
+
+  The are no RS-232 drivers on-board.  An RS-232 Click board is available:
+  https://shop.mikroe.com/click/interface/rs232 or you can cannot an off-
+  board TTL-to-RS-232 converter as follows:
+
+    USART2:  mikroBUS1 PD6/RX and PD5/TX
+    USART3:  mikroBUS2 PD9/RX and PD8TX
+
+  GND, 3.3V, and 5V.  Are also available
+
+  By default, USART3 on mikroBUS2 is used as the serial console in each
+  configuration unless stated otherwise in the description of the
+  configuration.
+
+LEDs
+====
+
+  The Mikroe Clicker2 STM32 has two user controllable LEDs:
+
+     LD1/PE12, Active high output illuminates
+     LD2/PE15, Active high output illuminates
+
+  If CONFIG_ARCH_LEDS is not defined, then the user can control the LEDs in any
+  way.  If CONFIG_ARCH_LEDs is defined, then NuttX will control the 2 LEDs on
+  board the Clicker2 for STM32.  The following definitions describe how NuttX
+  controls the LEDs:
+
+    SYMBOL               Meaning                      LED state
+                                                    LD1      LD2
+    -------------------  -----------------------  -------- --------
+    LED_STARTED          NuttX has been started     OFF      OFF
+    LED_HEAPALLOCATE     Heap has been allocated    OFF      OFF
+    LED_IRQSENABLED      Interrupts enabled         OFF      OFF
+    LED_STACKCREATED     Idle stack created         ON       OFF
+    LED_INIRQ            In an interrupt            N/C      ON
+    LED_SIGNAL           In a signal handler          No change
+    LED_ASSERTION        An assertion failed          No change
+    LED_PANIC            The system has crashed     OFF      Blinking
+    LED_IDLE             STM32 is is sleep mode       Not used
+
+  Thus is LD1 is illuminated, the Clicker2 has completed boot-up.  IF LD2
+  is glowly softly, then interrupts are being taken; the level of illumination
+  depends amount of time processing interupts.  If LD1 is off and LD2 is
+  blinking at about 2Hz, then the system has crashed.
+
+Buttons
+=======
+
+  The Mikroe Clicker2 STM32 has two buttons available to software:
+
+    T2/E0, Low sensed when pressed
+    T3/PA10, Low sensed when pressed
+
+Using JTAG
+==========
+
+  The Clicker2 comes with the mikroBootloader installed.  That bootloader
+  has not been used and is possibly incompatible with the Clicker2-STM32
+  linker script at configs/clicker2-stm32/scripts/flash.ld.  Often code must
+  be built to execute at an offset in to FLASH when a bootloader is used.
+  Certainly that is the case for the ST-Micro DFU bootloader but I am not
+  aware of the requirements for use with the mikroBootloader.
+
+  JTAG has been used in the development of this board support.  The
+  Clicker2-STM32 board offers a 2x5 JTAG connector.  You may use Dupont
+  jumpers to connect this port to JTAG as described here:
+
+    https://www.mikroe.com/how-to-use-st-link-v2-with-clicker-2-for-stm32-a-detailed-walkthrough/
+    http://www.playembedded.org/blog/en/2016/02/06/mikroe-clicker-2-for-stm32-and-stlink-v2/
+
+  NOTE that the FLASH probably has read protection enabled locked.  You may
+  need to follow the instructions at the second link to unlock it.  You can
+  also use the STM32 ST-Link CLI tool on Windows to remove the read protection
+  using the -OB command:
+
+    $ ./ST-LINK_CLI.exe -c SN=53FF6F064966545035320387 SWD LPM
+    STM32 ST-LINK CLI v2.3.0
+    STM32 ST-LINK Command Line Interface
+
+    ST-LINK SN : 53FF6F064966545035320387
+    ST-LINK Firmware version : V2J24S4
+    Connected via SWD.
+    SWD Frequency = 4000K.
+    Target voltage = 3.2 V.
+    Connection mode : Normal.
+    Debug in Low Power mode enabled.
+    Device ID:0x413
+    Device family :STM32F40xx/F41xx
+
+    $ ./ST-LINK_CLI.exe -OB RDP=0
+    STM32 ST-LINK CLI v2.3.0
+    STM32 ST-LINK Command Line Interface
+
+    ST-LINK SN : 53FF6F064966545035320387
+    ST-LINK Firmware version : V2J24S4
+    Connected via SWD.
+    SWD Frequency = 4000K.
+    Target voltage = 3.2 V.
+    Connection mode : Normal.
+    Device ID:0x413
+    Device family :STM32F40xx/F41xx
+    Updating option bytes...
+    Option bytes updated successfully.
+
+  NOTE:
+  1. You can get the ST-Link Utilies here:
+     http://www.st.com/en/embedded-software/stsw-link004.html
+  2. The ST-LINK Utility command line interface is located at:
+     [Install_Directory]\STM32 ST-LINK Utility\ST-LINK Utility\ST-LINK_CLI.exe
+  3. You can get a summary of all of the command options by running
+     ST-LINK_CLI.exe with no arguments.
+  4. You can get the serial number of the ST-Link when from the information
+     window if you connect via the ST-Link Utility:
+
+       11:04:28 : ST-LINK SN : 53FF6F064966545035320387
+       11:04:28 : ST-LINK Firmware version : V2J24S4
+       11:04:28 : Connected via SWD.
+       11:04:28 : SWD Frequency = 100 KHz.
+       11:04:28 : Connection mode : Normal.
+       11:04:28 : Debug in Low Power mode enabled.
+       11:04:30 : Device ID:0x413
+       11:04:30 : Device family :STM32F40xx/F41xx
+       11:04:30 : Can not read memory!
+                  Disable Read Out Protection and retry.
+
+  You can avoid the mess of jumpers using the mikroProg to ST-Link v2 adapter
+  along with a 2x5, 10-wire ribbon cable connector:
+
+    https://shop.mikroe.com/add-on-boards/adapter/mikroprog-st-link-v2-adapter
+
+  Then you can use the ST-Link Utility or other debugger software to write
+  the NuttX binary to FLASH.  OpenOCD can be used with the ST-Link to provide
+  a debug environment.  The debug adaptor is NOT compatible with other JTAG
+  debuggers such as the Segger J-Link.
+
+Configurations
+==============
+
+  Information Common to All Configurations
+  ----------------------------------------
+  Each Clicker2 configuration is maintained in a sub-directory and can be
+  selected as follow:
+
+    cd tools
+    ./configure.sh clicker2-stm32/<subdir>
+    cd -
+    . ./setenv.sh
+
+  Before sourcing the setenv.sh file above, you should examine it and
+  perform edits as necessary so that TOOLCHAIN_BIN is the correct path
+  to the directory than holds your toolchain binaries.
+
+  And then build NuttX by simply typing the following.  At the conclusion of
+  the make, the nuttx binary will reside in an ELF file called, simply, nuttx.
+
+    make oldconfig
+    make
+
+  The <subdir> that is provided above as an argument to the tools/configure.sh
+  must be is one of the following.
+
+  NOTES:
+
+    1. These configurations use the mconf-based configuration tool.  To
+      change any of these configurations using that tool, you should:
+
+      a. Build and install the kconfig-mconf tool.  See nuttx/README.txt
+         see additional README.txt files in the NuttX tools repository.
+
+      b. Execute 'make menuconfig' in nuttx/ in order to start the
+         reconfiguration process.
+
+    2. Unless stated otherwise, all configurations generate console
+       output on USART3, channel 0) as described above under "Serial
+       Console".  The relevant configuration settings are listed below:
+
+         CONFIG_STM32_USART3=y
+         CONFIG_STM32_USART3_SERIALDRIVER=y
+         CONFIG_STM32_USART=y
+
+         CONFIG_USART3_SERIALDRIVER=y
+         CONFIG_USART3_SERIAL_CONSOLE=y
+
+         CONFIG_USART3_RXBUFSIZE=256
+         CONFIG_USART3_TXBUFSIZE=256
+         CONFIG_USART3_BAUD=115200
+         CONFIG_USART3_BITS=8
+         CONFIG_USART3_PARITY=0
+         CONFIG_USART3_2STOP=0
+
+
+  3. All of these configurations are set up to build under Linux using the
+     "GNU Tools for ARM Embedded Processors" that is maintained by ARM
+     (unless stated otherwise in the description of the configuration).
+
+       https://launchpad.net/gcc-arm-embedded
+
+     That toolchain selection can easily be reconfigured using
+     'make menuconfig'.  Here are the relevant current settings:
+
+     Build Setup:
+       CONFIG_HOST_LINUX  =y               : Linux environment
+
+     System Type -> Toolchain:
+       CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIL=y : GNU ARM EABI toolchain
+
+  Configuration sub-directories
+  -----------------------------
+
+  nsh:
+
+    Configures the NuttShell (nsh) located at examples/nsh.  This
+    configuration is focused on low level, command-line driver testing.  It
+    has no network.
+
+    NOTES:
+
+    1. Support for NSH built-in applications is provided:
+
+       Binary Formats:
+         CONFIG_BUILTIN=y           : Enable support for built-in programs
+
+       Application Configuration:
+         CONFIG_NSH_BUILTIN_APPS=y  : Enable starting apps from NSH command line
+
+       No built applications are enabled in the base configuration, however.
+
+    2. C++ support for applications is enabled:
+
+      CONFIG_HAVE_CXX=y
+      CONFIG_HAVE_CXXINITIALIZE=y
+      CONFIG_EXAMPLES_NSH_CXXINITIALIZE=y

configs/clicker2-stm32/include/board.h

@@ -269,8 +269,8 @@
  * Assuming RS-232 connverted connected on mikroMB1/12
  */
 
-#define GPIO_USART2_RX   GPIO_USART2_RX_2   /* PD6 */
+#define GPIO_USART2_RX   GPIO_USART2_RX_2  /* PD6 */
-#define GPIO_USART2_TX   GPIO_USART2_TX_2   /* PD5 */
+#define GPIO_USART2_TX   GPIO_USART2_TX_2  /* PD5 */
 
 #define GPIO_USART3_RX   GPIO_USART3_RX_3  /* PD9 */
 #define GPIO_USART3_TX   GPIO_USART3_TX_3  /* PD8 /

configs/clicker2-stm32/nsh/defconfig

@@ -144,10 +144,10 @@ CONFIG_ARM_HAVE_MPU_UNIFIED=y
 # CONFIG_ARMV7M_HAVE_ITCM is not set
 # CONFIG_ARMV7M_HAVE_DTCM is not set
 # CONFIG_ARMV7M_TOOLCHAIN_IARL is not set
-CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y
+# CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT is not set
 # CONFIG_ARMV7M_TOOLCHAIN_CODEREDL is not set
 # CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYL is not set
-# CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIL is not set
+CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIL=y
 # CONFIG_ARMV7M_OABI_TOOLCHAIN is not set
 CONFIG_ARMV7M_HAVE_STACKCHECK=y
 # CONFIG_ARMV7M_STACKCHECK is not set

configs/clicker2-stm32/scripts/flash.ld

@@ -42,8 +42,7 @@
  *
  * When booting from FLASH, FLASH memory is aliased to address 0x0000:0000
  * where the code expects to begin execution by jumping to the entry point in
- * the 0x0800:0000 address
+ * the 0x0800:0000 address range.
- * range.
  */
 
 MEMORY

configs/clicker2-stm32/src/clicker2-stm32.h

@@ -33,8 +33,8 @@
  *
  ****************************************************************************/
 
-#ifndef __CONFIGS_OLIMEX_STM32_P407_SRC_H
+#ifndef __CONFIGS_CLICKER2_STM32_SRC_CLICKER2_H
-#define __CONFIGS_OLIMEX_STM32_P407_SRC_H
+#define __CONFIGS_CLICKER2_STM32_SRC_CLICKER2_H
 
 /****************************************************************************
  * Included Files
@@ -212,7 +212,7 @@
 
 #define GPIO_MB1_RST     (GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_50MHz|\
                           GPIO_OUTPUT_CLEAR|GPIO_PORTE|GPIO_PIN7)
-#define GPIO_MB1_RST     (GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_50MHz|\
+#define GPIO_MB2_RST     (GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_50MHz|\
                           GPIO_OUTPUT_CLEAR|GPIO_PORTE|GPIO_PIN13)
 
 /* Interrupts
@@ -287,4 +287,4 @@ int stm32_can_setup(void);
 #endif
 
 #endif  /* __ASSEMBLY__ */
-#endif /* __CONFIGS_OLIMEX_STM32_P407_SRC_H */
+#endif /* __CONFIGS_CLICKER2_STM32_SRC_CLICKER2_H */

configs/freedom-kl25z/include/kl_cc3000.h

@@ -1,5 +1,5 @@
 /****************************************************************************
- * configs/freedom-kl25z/include/kl_wifi.h
+ * configs/freedom-kl25z/include/kl_cc300.h
  *
  *   Copyright (C) 2013 Alan Carvalho de Assis
  *   Author: Alan Carvalho de Assis <acassis@gmail.com>
@@ -38,34 +38,36 @@
  *
  ****************************************************************************/
 
+#ifndef __CONFIGS_FREEDOM_KL25Z_INCLUDE_KL_CC3000_H
+#define __CONFIGS_FREEDOM_KL25Z_INCLUDE_KL_CC3000_H 1
+
 /****************************************************************************
  * Included Files
  ****************************************************************************/
+
 #include <stdio.h>
 #include <stdint.h>
 
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
 
 long ReadWlanInterruptPin(void);
 
-/*
+/* Enable WiFi Interrupt */
- * Enable WiFi Interrupt
- */
 
 void WlanInterruptEnable(void);
 
-/*
+/* Disable WiFi Interrupt */
- * Disable WiFi Interrupt
+
- */
 void WlanInterruptDisable(void);
 
-/*
+/* Enable/Disable WiFi */
- * Enable/Disable WiFi
+
- */
 void WriteWlanEnablePin(uint8_t val);
 
-/*
+/* Assert CC3000 CS */
- * Assert CC3000 CS
+
- */
 void AssertWlanCS(void);
 
 /*
@@ -73,8 +75,9 @@ void AssertWlanCS(void);
  */
 void DeassertWlanCS(void);
 
-/*
+/* Setup needed pins */
- * Setup needed pins
+
- */
 void Wlan_Setup(void);
 
+#endif /* __CONFIGS_FREEDOM_KL25Z_INCLUDE_KL_CC3000_H */
+

configs/freedom-kl25z/src/Makefile

@@ -43,7 +43,7 @@ CSRCS += kl_appinit.c
 endif
 
 ifeq ($(CONFIG_WL_CC3000),y)
-CSRCS += kl_wifi.c
+CSRCS += kl_cc3000.c
 endif
 
 ifeq ($(CONFIG_KL_TSI),y)

configs/freedom-kl25z/src/kl_cc3000.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * configs/freedom-kl25z/src/kl_tsi.c
+ * configs/freedom-kl25z/src/kl_cc3000.c
  *
  *   Copyright (C) 2014 Alan Carvalho de Assis
  *   Author: Alan Carvalho de Assis <acassis@gmail.com>
@@ -38,7 +38,7 @@
  ****************************************************************************/
 
 #include <nuttx/config.h>
-#include <arch/board/kl_wifi.h>
+#include <arch/board/kl_cc3000.h>
 
 #include <stdio.h>
 #include <stdint.h>
@@ -212,12 +212,12 @@ static void wl_enable_irq(FAR struct cc3000_config_s *state, bool enable)
   if (enable)
     {
       (void)kl_gpioirqattach(GPIO_WIFI_INT, priv->handler, priv->arg);
-      kl_gpioirqenable(GPIO_WIFI_INT); 
+      kl_gpioirqenable(GPIO_WIFI_INT);
     }
   else
     {
       (void)kl_gpioirqattach(GPIO_WIFI_INT, NULL, NULL);
-      kl_gpioirqdisable(GPIO_WIFI_INT); 
+      kl_gpioirqdisable(GPIO_WIFI_INT);
     }
 }
 

configs/nucleo-l476rg/src/Makefile

@@ -49,7 +49,7 @@ CSRCS +=  stm32_buttons.c
 endif
 
 ifeq ($(CONFIG_WL_CC3000),y)
-CSRCS += stm32_wireless.c
+CSRCS += stm32_cc3000.c
 ifeq ($(CONFIG_CC3000_PROBES),)
 CSRCS += stm32_io.c
 endif

configs/nucleo-l476rg/src/stm32_cc3000.c

@@ -1,5 +1,5 @@
 /************************************************************************************
- * configs/nucleo-l476rg/src/stm32_wireless.c
+ * configs/nucleo-l476rg/src/stm32_cc3000.c
  *
  *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
  *   Author: Laurent Latil <laurent@latil.nom.fr>

configs/spark/src/Makefile

@@ -66,7 +66,7 @@ CSRCS += stm32_composite.c
 endif
 
 ifeq ($(CONFIG_WL_CC3000),y)
-CSRCS += stm32_wireless.c
+CSRCS += stm32_cc3000.c
 endif
 
 ifeq ($(CONFIG_CC3000_PROBES),)

configs/spark/src/stm32_cc3000.c

@@ -1,5 +1,5 @@
 /************************************************************************************
- * configs/spark/src/stm32_wireless.c
+ * configs/spark/src/stm32_cc3000.c
  *
  *   Copyright (C) 2009, 2013 Gregory Nutt. All rights reserved.
  *   Author: Laurent Latil <laurent@latil.nom.fr>

configs/stm32_tiny/src/Makefile

@@ -44,7 +44,7 @@ CSRCS += stm32_pwm.c
 endif
 
 ifeq ($(CONFIG_WL_NRF24L01),y)
-CSRCS += stm32_wireless.c
+CSRCS += stm32_cc3000.c
 endif
 
 ifeq ($(CONFIG_LIB_BOARDCTL),y)

configs/stm32_tiny/src/stm32_cc3000.c

@@ -1,5 +1,5 @@
 /************************************************************************************
- * configs/stm32_tiny/src/stm32_wireless.c
+ * configs/stm32_tiny/src/stm32_cc3000.c
  *
  *   Copyright (C) 2009, 2013, 2017 Gregory Nutt. All rights reserved.
  *   Author: Laurent Latil <laurent@latil.nom.fr>

configs/stm32f103-minimum/src/Makefile

@@ -86,7 +86,7 @@ CSRCS += stm32_veml6070.c
 endif
 
 ifeq ($(CONFIG_WL_NRF24L01),y)
-CSRCS += stm32_wireless.c
+CSRCS += stm32_cc3000.c
 endif
 
 ifeq ($(CONFIG_USBDEV),y)

configs/stm32f103-minimum/src/stm32_cc3000.c

@@ -1,5 +1,5 @@
 /************************************************************************************
- * configs/stm32f103-minimum//src/stm32_wireless.c
+ * configs/stm32f103-minimum//src/stm32_cc3000.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *   Author: Laurent Latil <laurent@latil.nom.fr>

include/nuttx/compiler.h

@@ -64,6 +64,18 @@
 
 # define UNUSED(a) ((void)(a))
 
+/* Built-in functions */
+
+/* GCC 4.x have __builtin_ctz(|l|ll) and __builtin_clz(|l|ll). These count
+ * trailing/leading zeros of input number and typically will generate few
+ * fast bit-counting instructions. Inputting zero to these functions is
+ * undefined and needs to be taken care of by the caller. */
+
+#if __GNUC__ >= 4
+#  define CONFIG_HAVE_BUILTIN_CTZ 1
+#  define CONFIG_HAVE_BUILTIN_CLZ 1
+#endif
+
 /* Attributes
  *
  * GCC supports weak symbols which can be used to reduce code size because

include/semaphore.h

@@ -105,14 +105,14 @@ typedef struct sem_s sem_t;
 #ifdef CONFIG_PRIORITY_INHERITANCE
 # if CONFIG_SEM_PREALLOCHOLDERS > 0
 #  define SEM_INITIALIZER(c) \
-    {(c), 0, NULL}                 /* semcount, flags, hhead */
+    {(c), 0, NULL}               /* semcount, flags, hhead */
 # else
 #  define SEM_INITIALIZER(c) \
     {(c), 0, {SEMHOLDER_INITIALIZER, SEMHOLDER_INITIALIZER}} /* semcount, flags, holder[2] */
 # endif
 #else
 #  define SEM_INITIALIZER(c) \
-    {(c)}                         /* semcount */
+    {(c)}                        /* semcount */
 #endif
 
 /****************************************************************************

include/strings.h

@@ -114,6 +114,17 @@ static inline FAR char *rindex(FAR const char *s, int c)
  ****************************************************************************/
 
 int ffs(int j);
+int ffsl(long j);
+#ifdef CONFIG_HAVE_LONG_LONG
+int ffsll(long long j);
+#endif
+
+int fls(int j);
+int flsl(long j);
+#ifdef CONFIG_HAVE_LONG_LONG
+int flsll(long long j);
+#endif
+
 int strcasecmp(FAR const char *, FAR const char *);
 int strncasecmp(FAR const char *, FAR const char *, size_t);
 

libc/string/Make.defs

@@ -35,7 +35,8 @@
 
 # Add the string C files to the build
 
-CSRCS += lib_ffs.c lib_isbasedigit.c lib_memset.c lib_memchr.c
+CSRCS += lib_ffs.c lib_ffsl.c lib_ffsll.c lib_fls.c lib_flsl.c
+CSRCS += lib_flsll.c lib_isbasedigit.c lib_memset.c lib_memchr.c
 CSRCS += lib_memccpy.c lib_memcmp.c lib_memmove.c lib_skipspace.c
 CSRCS += lib_stpcpy.c lib_strcasecmp.c lib_strcat.c lib_strchr.c
 CSRCS += lib_strcpy.c lib_strcmp.c lib_strcspn.c lib_strdup.c

libc/string/lib_ffs.c

@@ -33,11 +33,11 @@
  *
  ****************************************************************************/
 
-
 /****************************************************************************
  * Included Files
  ****************************************************************************/
 
+#include <nuttx/compiler.h>
 #include <strings.h>
 
 /****************************************************************************
@@ -55,11 +55,11 @@
  *
  * Description:
  *   The ffs() function will find the first bit set (beginning with the least
- *   significant bit) in i, and return the index of that bit. Bits are
+ *   significant bit) in j, and return the index of that bit. Bits are
  *   numbered starting at one (the least significant bit).
  *
  * Returned Value:
- *   The ffs() function will return the index of the first bit set. If i is
+ *   The ffs() function will return the index of the first bit set. If j is
  *   0, then ffs() will return 0.
  *
  ****************************************************************************/
@@ -70,6 +70,11 @@ int ffs(int j)
 
   if (j != 0)
     {
+#ifdef CONFIG_HAVE_BUILTIN_CTZ
+      /* Count trailing zeros function can be used to implement ffs. */
+
+      ret = __builtin_ctz(j) + 1;
+#else
       unsigned int value = (unsigned int)j;
       int bitno;
 
@@ -81,6 +86,7 @@ int ffs(int j)
               break;
             }
         }
+#endif
     }
 
   return ret;

libc/string/lib_ffsl.c

@@ -0,0 +1,93 @@
+/****************************************************************************
+ * libc/string/lib_ffsl.c
+ *
+ *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/compiler.h>
+#include <strings.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define NBITS (8 * sizeof(unsigned long))
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ffsl
+ *
+ * Description:
+ *   The ffsl() function will find the first bit set (beginning with the least
+ *   significant bit) in j, and return the index of that bit. Bits are
+ *   numbered starting at one (the least significant bit).
+ *
+ * Returned Value:
+ *   The ffsl() function will return the index of the first bit set. If j is
+ *   0, then ffsl() will return 0.
+ *
+ ****************************************************************************/
+
+int ffsl(long j)
+{
+  int ret = 0;
+
+  if (j != 0)
+    {
+#ifdef CONFIG_HAVE_BUILTIN_CTZ
+      /* Count trailing zeros function can be used to implement ffs. */
+
+      ret = __builtin_ctzl(j) + 1;
+#else
+      unsigned long value = (unsigned long)j;
+      int bitno;
+
+      for (bitno = 1; bitno <= NBITS; bitno++, value >>= 1)
+        {
+          if ((value & 1) != 0)
+            {
+              ret = bitno;
+              break;
+            }
+        }
+#endif
+    }
+
+  return ret;
+}

libc/string/lib_ffsll.c

@@ -0,0 +1,97 @@
+/****************************************************************************
+ * libc/string/lib_ffsll.c
+ *
+ *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/compiler.h>
+#include <strings.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define NBITS (8 * sizeof(unsigned long long))
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_LONG
+
+/****************************************************************************
+ * Name: ffsll
+ *
+ * Description:
+ *   The ffsll() function will find the first bit set (beginning with the least
+ *   significant bit) in i, and return the index of that bit. Bits are
+ *   numbered starting at one (the least significant bit).
+ *
+ * Returned Value:
+ *   The ffsll() function will return the index of the first bit set. If j is
+ *   0, then ffsll() will return 0.
+ *
+ ****************************************************************************/
+
+int ffsll(long long j)
+{
+  int ret = 0;
+
+  if (j != 0)
+    {
+#ifdef CONFIG_HAVE_BUILTIN_CTZ
+      /* Count trailing zeros function can be used to implement ffs. */
+
+      ret = __builtin_ctzll(j) + 1;
+#else
+      unsigned long long value = (unsigned long long)j;
+      int bitno;
+
+      for (bitno = 1; bitno <= NBITS; bitno++, value >>= 1)
+        {
+          if ((value & 1) != 0)
+            {
+              ret = bitno;
+              break;
+            }
+        }
+#endif
+    }
+
+  return ret;
+}
+
+#endif

libc/string/lib_fls.c

@@ -0,0 +1,93 @@
+/****************************************************************************
+ * libc/string/lib_fls.c
+ *
+ *   Copyright (C) 2017 Haltian Ltd. All rights reserved.
+ *   Author: Jussi Kivilinna <jussi.kivilinna@haltian.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/compiler.h>
+#include <strings.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define NBITS (8 * sizeof(unsigned int))
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fls
+ *
+ * Description:
+ *   The fls() function will find the last bit set in value and return
+ *   the index of that bit. Bits are numbered starting at one (the least
+ *   significant bit).
+ *
+ * Returned Value:
+ *   The fls() function will return the index of the last bit set. If j is
+ *   0, then fls() will return 0.
+ *
+ ****************************************************************************/
+
+int fls(int j)
+{
+  int ret = 0;
+
+  if (j != 0)
+    {
+#ifdef CONFIG_HAVE_BUILTIN_CLZ
+      /* Count leading zeros function can be used to implement fls. */
+
+      ret = NBITS - __builtin_clz(j);
+#else
+      unsigned int value = (unsigned int)j;
+      int bitno;
+
+      for (bitno = 1; bitno <= NBITS; bitno++, value >>= 1)
+        {
+          if (value == 1)
+            {
+              ret = bitno;
+              break;
+            }
+        }
+#endif
+    }
+
+  return ret;
+}

libc/string/lib_flsl.c

@@ -0,0 +1,93 @@
+/****************************************************************************
+ * libc/string/lib_fls.c
+ *
+ *   Copyright (C) 2017 Haltian Ltd. All rights reserved.
+ *   Author: Jussi Kivilinna <jussi.kivilinna@haltian.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/compiler.h>
+#include <strings.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define NBITS (8 * sizeof(unsigned long))
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: flsl
+ *
+ * Description:
+ *   The flsl() function will find the last bit set in value and return
+ *   the index of that bit. Bits are numbered starting at one (the least
+ *   significant bit).
+ *
+ * Returned Value:
+ *   The flsl() function will return the index of the last bit set. If j is
+ *   0, then flsl() will return 0.
+ *
+ ****************************************************************************/
+
+int flsl(long j)
+{
+  int ret = 0;
+
+  if (j != 0)
+    {
+#ifdef CONFIG_HAVE_BUILTIN_CLZ
+      /* Count leading zeros function can be used to implement fls. */
+
+      ret = NBITS - __builtin_clzl(j);
+#else
+      unsigned long value = (unsigned long)j;
+      int bitno;
+
+      for (bitno = 1; bitno <= NBITS; bitno++, value >>= 1)
+        {
+          if (value == 1)
+            {
+              ret = bitno;
+              break;
+            }
+        }
+#endif
+    }
+
+  return ret;
+}

libc/string/lib_flsll.c

@@ -0,0 +1,98 @@
+/****************************************************************************
+ * libc/string/lib_fls.c
+ *
+ *   Copyright (C) 2017 Haltian Ltd. All rights reserved.
+ *   Author: Jussi Kivilinna <jussi.kivilinna@haltian.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/compiler.h>
+#include <strings.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define NBITS (8 * sizeof(unsigned long long))
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_LONG
+
+/****************************************************************************
+ * Name: flsll
+ *
+ * Description:
+ *   The flsll() function will find the last bit set in value and return
+ *   the index of that bit. Bits are numbered starting at one (the least
+ *   significant bit).
+ *
+ * Returned Value:
+ *   The flsll() function will return the index of the last bit set. If j is
+ *   0, then flsll() will return 0.
+ *
+ ****************************************************************************/
+
+int flsll(long long j)
+{
+  int ret = 0;
+
+  if (j != 0)
+    {
+#ifdef CONFIG_HAVE_BUILTIN_CLZ
+      /* Count leading zeros function can be used to implement fls. */
+
+      ret = NBITS - __builtin_clzll(j);
+#else
+      unsigned long long value = (unsigned long long)j;
+      int bitno;
+
+      for (bitno = 1; bitno <= NBITS; bitno++, value >>= 1)
+        {
+          if (value == 1)
+            {
+              ret = bitno;
+              break;
+            }
+        }
+#endif
+    }
+
+  return ret;
+}
+
+#endif
+