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>

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

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>

configs:  Both CONFIG_LIB_BOARDCTL=y and CONFIG_BOARD_INITIALIZE=y is not meaningful in the standalone NxWM.  CONFIG_LIB_BOARDCTL=y is the better option so  CONFIG_BOARD_INITIALIZE=y removed from these configurations.

configs:  There should be either CONFIG_LIB_BOARDCTL=y or CONFIG_BOARD_INITIALIZE=y in the defconfig of every standalone NxWM configuration to assure that all of the board resources are initialized... especially the touchscreen since it it now a part of the board driver initialization.

Fixed misprint in smartfs_utils.c

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

configs:  Since the touch screen initialization is now called from one-time board-initialization logic, it no longer needs protection from re-entry.

Squashed commit of the following:

    configs:  Each board now initializes the touchscreen controller as a normal part of its board bring-up.  board_tsc_setup() is gone; the touchscreen controller is now treated like any other on-board device.
    Remove all support for BOARDIOC_TSCTEST_SETUP
    Move prototype for board_tsc_setup() from include/nuttx/board.h to individual board header files.