SAMDL: Added SAMD DAC header file. Fixed SAMD EVSYS header. Added SAMD TC header file. Fixed some minor typos

* SAMD External Interrupt Controller (EIC) support

* removed comment

* SAMDL: SPI must be disabled before changing the mode bits in CTRLA register

* arch/arm/src/lc823450: Assign I2S IRQ handling to CPU0

    Previous commit assumed that the caller is running on CPU0.
    However, the caller sometimes runs at CPU1.  This patch will
    assign the caller to CPU0 explicitly.

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

* arch/arm/src/lc823450: Change irqwarn() to ASSERT() in up_ack_irq()

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

* configs/lc823450-xgevk: Update README.txt and defconfigs

    Update comments on SMP in README.txt
    Enable SYSTEM_TIME64 in defconfigs.
    Enable INSTRUMENTATION in rndis configuration.

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

* configst/stm3240g-eval:  Remove only bogus logic to start the NX server.  That was there only to support the knxwm configuration and was implemented priorit to boardctl(BOARCIOC_NX_START).

* drivers/input/ft5x06.c:  Remove cool logic to disable polling when there there is no client waiting for read data.  That was a great idea to save CPU cycles when there is nothing reading from the touchscrren but, unfortunately, does not work with readers that open the driver in non-blocking mode.  So I think we just have to eat the CPUs even when there is nothing waiting for touchscreen input.

* configs/lpcxpresso-lpc54628/lvgl:  Add LittlevGL graphics demo configuration.

*  configs/lpcxpresso-lpc54628: Update README

* include/termios.h:  Update comments; fix long lines.

* sched/semaphore: Add ASSERT(false) in nxsem_post() if no waiting task is found.

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

* sched/sched/sched_sporadic.c: fix compiler error when priority inheritance is enabled.  Noted by eunb.song@samsung.com

* Change ASSERT(false) to DEBUGPANIC().

* Documentation: Fix copy/paste error in NX graphics document.  Noted by Henjiu Kang.

* sched/sched:  Fix some priority inheritance related issues noted during review of logic.  Also add some REVISIT comments for some issues noted in the design.

* Update README and some comments

* Issue #85: /dev/userleds is not working for nucleo-l432kc fixed

* configs/nucleo-l432kc: Fix numerous cloning errors/typos.

* Update TODO list

* NUCLEO F432KC typo fixed, correct name is L432KC

    Just README.txt and comments affected, no changes in the code

* Merged in raiden00/nuttx (pull request #579)

    Master

    * stm32_hritm: add interface to get timer clock frequency

        stm32_hrtim: fix timer freq calculation

        stm32_hrtim: add compar/capture registers significant bits checking

        stm32_hrtim: minor changes

    * stm32f334-disco: add buck converter and boost converter logic

Approved-by: Gregory Nutt <gnutt@nuttx.org>

* fs/userfs: use correct req type in userfs_truncate, remove use of undeclared buf

* Merged in david_alessio/nuttx/refactor-pll-setup (pull request #581)

    Refactor pll setup

    * fix typo in #def

    * refactor PLL setup code...

    * refactored PLL/CLK config, easier, checks for correctness

    * call go_os_start if STACK_COLORIZED

    * smarter config of EXTCLK output freq

    * cosmetic

Approved-by: Gregory Nutt <gnutt@nuttx.org>

* The existence of the network driver ioctl() method should depend on CONFIG_NETDEV_IOCTL rather than CONFIG_NETDEV_PHY_IOCTL.  The former enables the method, the later enables a subset of possible driver IOCTLs.  This change should be basically a no-operation.  The affected ioctl methods only support those subset of driver IOCTLs selected by CONFIG_NETDEV_PHY_IOCTL and the network logic will tolerate a nul ioctl method.

* net/tcp:  Write buffering logic should not wait for a free buffer if the socket was opened non-blocking.  Also, rename the TCP write buffering macros from WRB_* to TCPWB_* to make room in the namespace for write buffering with other protocols.

* net/udp:  Remove some conditional logic that was true if there is only a single network device, but not true in the multi-device context.

* This commit adds an as-of-yet untested implemented of UDP write buffering.

    Squashed commit of the following:

        net/udp:  Address most of the issues with UDP write buffering.  There is a remaining issue with handling one network going down in a multi-network environment.  None of this has been test but it is certainly ready for test.  Hence, the feature is marked EXPERIMENTAL.
        net/udp:  Some baby steps toward a corrected write buffering design.
        net/udp:  Remove pesky write buffer macros.
        Eliminate trailing space at the end of lines.
        net/udp:  A little more UDP write buffering logic.  Still at least on big gaping hole in the design.
        net/udp:  Undefined CONFIG_NET_SENDTO_TIMEOUT.
        net/udp:  Crude, naive port of the TCP write buffering logic into UDP.  This commit is certainly non-functional and is simply a starting point for the implementatin of UDP write buffering.
        net/udp:  Rename udp/udp_psock_sendto.c udp/udp_psock_sendto_unbuffered.c.

* net/udp:  In sendto(), return EHOSTUNREACH if if the network is down.

* net/udp:  Resolves final design issues with UDP write buffering.  100% code complete but also 100% untested.

* net/udp and tcp:  Yet another (cosmetic) change to UDP and TCP write buffer macro naming.

* net/udp:  UDP write buffering is basically functional but needs a lot more verification.

* net/udp:  Fix memory leak with UDP + write buffer is closed.  Also update TODO and comments and refresh a configuration.

* Update some comments.

* drivers/mtd/at24xx.c: Correct page size for AT24C02 part.

* arch/arm/src/stm32:  Make STM32 usable with an external RTC.   drivers/timers/ds3231.c:  Correct some debug statments.

* arch/arm/src/stm32/stm32_spi.c: Removed unnecessary (and incorrect) speed limitation

* arch/arm/src/stm32/stm32f40xxx_i2c.c:  Correct some recent changes to STM32F4 I2C that broke poll mode of operation.

* configs/flipnclick-sam3x:  Using JTAG (vs. Bossac) I was finally able to load code and verify the basic NSH configuration.  Updated READMEs.  Also switched to USART0 (vs UART0) for the serial console because I was not getting bi-directional communication on the VCOM.

* SAMDL: Added SAMD DAC header file. Fixed SAMD EVSYS header. Added SAMD TC header file. Fixed some minor typos

* fix typo

* added missing EVCTRL register bits in TC

Approved-by: Gregory Nutt <gnutt@nuttx.org>

configs/flipnclick-sam3x:  Using JTAG (vs. Bossac) I was finally able to load code and verify the basic NSH configuration.  Updated READMEs.  Also switched to USART0 (vs UART0) for the serial console because I was not getting bi-directional communication on the VCOM.

arch/arm/src/stm32/stm32f40xxx_i2c.c:  Correct some recent changes to STM32F4 I2C that broke poll mode of operation.

arch/arm/src/stm32:  Make STM32 usable with an external RTC.   drivers/timers/ds3231.c:  Correct some debug statments.

net/udp:  Fix memory leak with UDP + write buffer is closed.  Also update TODO and comments and refresh a configuration.

net/udp:  Resolves final design issues with UDP write buffering.  100% code complete but also 100% untested.

Squashed commit of the following:

    net/udp:  Address most of the issues with UDP write buffering.  There is a remaining issue with handling one network going down in a multi-network environment.  None of this has been test but it is certainly ready for test.  Hence, the feature is marked EXPERIMENTAL.
    net/udp:  Some baby steps toward a corrected write buffering design.
    net/udp:  Remove pesky write buffer macros.
    Eliminate trailing space at the end of lines.
    net/udp:  A little more UDP write buffering logic.  Still at least on big gaping hole in the design.
    net/udp:  Undefined CONFIG_NET_SENDTO_TIMEOUT.
    net/udp:  Crude, naive port of the TCP write buffering logic into UDP.  This commit is certainly non-functional and is simply a starting point for the implementatin of UDP write buffering.
    net/udp:  Rename udp/udp_psock_sendto.c udp/udp_psock_sendto_unbuffered.c.

net/udp:  Remove some conditional logic that was true if there is only a single network device, but not true in the multi-device context.

net/tcp:  Write buffering logic should not wait for a free buffer if the socket was opened non-blocking.  Also, rename the TCP write buffering macros from WRB_* to TCPWB_* to make room in the namespace for write buffering with other protocols.

The existence of the network driver ioctl() method should depend on CONFIG_NETDEV_IOCTL rather than CONFIG_NETDEV_PHY_IOCTL.  The former enables the method, the later enables a subset of possible driver IOCTLs.  This change should be basically a no-operation.  The affected ioctl methods only support those subset of driver IOCTLs selected by CONFIG_NETDEV_PHY_IOCTL and the network logic will tolerate a nul ioctl method.

Refactor pll setup

* fix typo in #def

* refactor PLL setup code...

* refactored PLL/CLK config, easier, checks for correctness

* call go_os_start if STACK_COLORIZED

* smarter config of EXTCLK output freq

* cosmetic

Approved-by: Gregory Nutt <gnutt@nuttx.org>

NUCLEO F432KC typo fixed, correct name is L432KC

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Master

* stm32_hritm: add interface to get timer clock frequency

    stm32_hrtim: fix timer freq calculation

    stm32_hrtim: add compar/capture registers significant bits checking

    stm32_hrtim: minor changes

* stm32f334-disco: add buck converter and boost converter logic

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Just README.txt and comments affected, no changes in the code

Issue #85: /dev/userleds is not working for nucleo-l432kc fixed

Approved-by: Gregory Nutt <gnutt@nuttx.org>

sched/sched:  Fix some priority inheritance related issues noted during review of logic.  Also add some REVISIT comments for some issues noted in the design.

sched/sched/sched_sporadic.c: fix compiler error when priority inheritance is enabled.  Noted by eunb.song@samsung.com

sched/semaphore: Add ASSERT(false) in nxsem_post() if no waiting task is found.

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

drivers/input/ft5x06.c:  Remove cool logic to disable polling when there there is no client waiting for read data.  That was a great idea to save CPU cycles when there is nothing reading from the touchscrren but, unfortunately, does not work with readers that open the driver in non-blocking mode.  So I think we just have to eat the CPUs even when there is nothing waiting for touchscreen input.

configst/stm3240g-eval:  Remove only bogus logic to start the NX server.  That was there only to support the knxwm configuration and was implemented priorit to boardctl(BOARCIOC_NX_START).

SAMDL: SPI must be disabled before changing the mode bits in CTRLA register

* SAMD External Interrupt Controller (EIC) support

* removed comment

* SAMDL: SPI must be disabled before changing the mode bits in CTRLA register

Approved-by: Gregory Nutt <gnutt@nuttx.org>

lc823450 fixes

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Update comments on SMP in README.txt
Enable SYSTEM_TIME64 in defconfigs.
Enable INSTRUMENTATION in rndis configuration.

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>