This driver currently only supports the SPI connected DS3234, and only
for initializing 1 Hz square wave output on the SQW pin, nothing else.

Updated xbee to use NETOPT_MAX_DPU_SIZE instead of the deprecated
NETOPT_MAX_PACKET_SIZE

Updated sx127x to use NETOPT_MAX_DPU_SIZE instead of the deprecated
NETOPT_MAX_PACKET_SIZE

Updated netdev_ieee802154 to use NETOPT_MAX_DPU_SIZE instead of the deprecated
NETOPT_MAX_PACKET_SIZE

Updated netdev_eth to use NETOPT_MAX_DPU_SIZE instead of the deprecated
NETOPT_MAX_PACKET_SIZE

Updated cc110x to use NETOPT_MAX_DPU_SIZE instead of the deprecated
NETOPT_MAX_PACKET_SIZE

URLs of the datasheets have been changed.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

fixes #11013

Change description to reflect the configurability of the serial
interface.

Also, fix the uart_mode parameter description as the UART will be
configured and not initialized.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

URLs have been changed to:

https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMP280-DS001.pdf
https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280-DS002.pdf

)

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

Several parts were inspired by a driver written by:
  George Psimenos (gp7g14@soton.ac.uk)
  Steffen Robertz (steffen.robertz@rwth-aachen.de)

The documentation refers to the `HDC1000_PARAM_RENEW_INTERVAL` as
`HDC1000_RENEW_INTERVAL`.

netdev_driver_t::get(NETOPT_MAX_PACKET_SIZE) used to return the maximum frame
size instead of the maximum layer 2 PDU size.

Introduced CC110X_L2_HDR_SIZE to get rid of magic numbers.

Removing usage of netdev->stats in all net drivers, as it is
handled by gnrc_netif.

This removes the netopt to get layer 2 netstats from netdev.

This the first step in moving the collection of layer 2 netstats from
the low level driver to a central location, ie. gnrc_netif, to avoid
code duplication.

As suggested in PR#5899 add a routine uart_mode() that will
setup data bits, stop bits and parity at runtime.

uart.h provides a set of enums defining these settings and each
platform will override them to specify values corresponding to
its configuration registers.

The idea behind the enums is to specify default settings i.e. 8N1
through the 0 value item. Invoking uart_mode(uart, 0, 0, 0) will
setup 8N1 mode.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

If netdev_driver_t::recv() is called and the provided buffer is smaller than
the frame then `-ENOBUFS` should be returned, the frame should be dropped, and
no data of the frame should be returned.

Addresses: https://github.com/RIOT-OS/RIOT/issues/10413

The netdev_driver_t::recv implementation of the w5100 does not provide the
drop feature. This commit adds it.

Fixes: https://github.com/RIOT-OS/RIOT/issues/10410

Implemented an example `ltc4150_recorder_t` implementation as a proof of concept
for the recorder API.

The LTC4150 is a coulomb counter (a.k.a. battery sensor or bidirectional
current sensor) that is used in the MSBA2 board and available for little money
as easy to use break out board.