XMC4xxx: Simply some USIC logic, add USIC interface to disable a channel.  Add USIC enable logic to UART configuration (a lot more to do there).

STM32F3: Add COMP support

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

XMC4xxx: Revise configuration for USICs.  Three USICs but 4 UARTs possible with each channel of USIC.

mtd/progmem: fix incorrect target address calculation

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

STM32F33: Move DMA logic to a separate files + add ADC support

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

progmem_read/write() is incorrectly calculating the target address,
expecting the offset argument is given in a block number. This is
completely wrong and as a result invalid flash region is accessed.
Byte-oriented read/write interfaces of mtd device accept the
target address in a byte offset, not a block number.

Signed-off-by: Heesub Shin <heesub.shin@samsung.com>

ARM: Fix off-by-one interrupt stack allocation (revert missed change in up_initialize.c)

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

USB Host driver for the XBox One game controller

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

Adds driver support for the XBox One controller.  Currently only the latest version (XBox One X) controller works.  The older XBox One controllers do not enumerate correctly.

vsnprintf(): If size is zero, then vsnprintf() should return the size of the required buffer without writing anything.  This is same fix that was done for snprintf in 2014 by commit 59846a8f.

libc: printf: fix precision for string formatting. Fixes use of format precision to truncate input string.