Driver did not work on ESP32c3, by specifying pin to be output and
input solve the issue. Improve documentation, to highlight that driver
is requiring open-drain support.
Signed-off-by: Fredrik Gihl <fgihl@hotmail.com>
The zephyr-gpio w1 driver introduced in this commit implements
all routines for the w1 api on top of the zephyr gpio driver.
W1 bit read, write, and reset operations are executed by
bit-banging the selected gpio.
Signed-off-by: Hudson C. Dalpra <hudson@bduncanltd.com>
This adds a driver for the DS2482-800 1-wire multi channel bus driver.
The driver uses a split architecture in order to share a common lock
among all configured channels of a single IC.
Signed-off-by: Caspar Friedrich <c.s.w.friedrich@gmail.com>
DTS property attributes are (by default) not required.
Explicitly specifying `required: false` is redundant.
Perhaps a warning to that effect would be useful.
Signed-off-by: Chris Friedt <cfriedt@meta.com>
This commit introduces the 1-wire master driver for maxim ds2485.
The ds2485 master has nearly the same (1-wire) feature set and
i2c-interface as the ds2477.
Therefore the common parts are extracted, but to avoid
any nda troubles only the ds2485 specific part is included.
Compared to older 1-wire masters, the ds2485 supports higher level
commands, supporting multi byte operations, search next, automatic crc
calculation.
In this driver only basic read and write operations are supported,
further hardware features are not yet utilized by the driver.
Signed-off-by: Thomas Stranger <thomas.stranger@outlook.com>
This adds a driver for Maxims DS2484 Single-Channel 1-Wire master
driver. The DS2484 features an extra pin to enable sleep modes which
is available if the pin is configured in the device tree.
Signed-off-by: Caspar Friedrich <c.s.w.friedrich@gmail.com>
The zephyr-serial w1 driver introduced in this commit implements
all routines for the w1 api on top of the zephyr serial driver.
W1 bit read, write, and reset operations are executed by issuing
polling zephyr serial byte read and write operations.
The driver should be usable on most platforms in zephyr that have
implemented support for the polling procedures of the serial driver.
As not all serial drivers are implemented exactly the same minor
additional quirks may be needed on some platforms.
The most notable difference of polling serial driver implementations
seems to be that some return immediately from poll_out after the
transmission was started(e.g. STM32) and others wait until
the transmission was completed before returning from poll_out
(e.g. NRF). While this has influence on the timeout, both types
are supported by this driver because the driver waits for a
configurable time period until it terminates the read.
The driver needs an appropriate open drain interface to be able
to communicate with slaves.
In the simpliest case this might be achived by configuring the mcu pins
in open-drain configuration with a (sufficiently small) pull-up to 3V3/5V.
Otherwise an external circuit needs to provide this interface.
Overdrive and Standard Speed modes are supported by this driver.
Signed-off-by: Thomas Stranger <thomas.stranger@outlook.com>
This commit introduces a new api for the Dallas 1-wire protocol.
The api includes link functions for read and write operations on
bit, byte, and block level, as well as functions to reset and
lock the bus.
The bus configuration is derived from the device tree and can be
queried using w1_slave_count routine.
Signed-off-by: Thomas Stranger <thomas.stranger@outlook.com>
