The design of the pipe is overly complicated compared to the
in-tree and planned future use of the pipe module.
The pipe is currently designed to protect against multiple
threads calling any API simultaineously. This is not neccesary
as only one thread ever calls open/close/transmit/receive at
once, while the notification APIs are potentially called by a
different thread.
This commit removes the synchronization of calls to the open/
close/receive/transmit APIs. It also uses a k_event for thread
safe event and state handling instead of a k_mutex and k_condvar.
The callback is proteced by a k_sem as it modified using the
attach/release APIs, which can be called simultaneously to a
thread invoking the callback.
Signed-off-by: Bjarki Arge Andreasen <bjarki@arge-andreasen.me>
Add modem pipelink module which exposes modem pipes globally.
The pipelink module implements a callback to inform when a
pipe becomes available to use by whichever modem is attached
to it. This could be a shell, or a network interface.
The module aims to allow modem drivers to be split into modules,
and allowing applications to implement their own custom logic
without altering the modem drivers.
Signed-off-by: Bjarki Arge Andreasen <bjarki@arge-andreasen.me>
Add statistics module which tracks the usage of modem backend
transmit/receive buffers if implemented by a backend.
A modem backend may register itself to the modem backend
stat module, and advertise its transmit and receive buffer
sizes and momentary usage (length).
The modem backend module tracks the maximum usage, which can be
output to the shell using the "modem_stats buffer" shell command.
Signed-off-by: Bjarki Arge Andreasen <bjarki@arge-andreasen.me>
A Kconfig item is added and the buffer
is embedded into the modem_cmux struct.
The default value is increased from 16 to 64 bytes in
an effort to reduce the number of modem_pipe_receive() calls.
CONFIG_MODEM_CHAT_LOG_BUFFER is renamed
to CONFIG_MODEM_CHAT_LOG_BUFFER_SIZE for consistency.
Signed-off-by: Tomi Fontanilles <tomi.fontanilles@nordicsemi.no>
MODEM_UBX: Adds Support for UBX Messages in Modem Subsystem.
GNSS API Supported: get_supported_systems, set_fix_rate, get_fix_rate,
set_enabled_systems, get_enabled_systems, set_navigation_mode,
get_navigation_mode.
Boards Tested: MIMXRT1062_FMURT6, VMU_RT1170.
Note: Partial support for U-BLOX Messages is provided as of now.
Signed-off-by: Sumit Batra <sumit.batra@nxp.com>
Signed-off-by: Mayank Mahajan <mayankmahajan.x@nxp.com>
This commit adds logging for CMUX frames and commands and
their data, for both transmit and receive. It also removes
the superseded LOG_DBG() lines like "Received frame".
Signed-off-by: Bjarki Arge Andreasen <bjarkix123@gmail.com>
This PR adds the following modem modules to the subsys/modem
folder:
- chat: Light implementation of the Linux chat program, used to
send and receive text based commands statically created
scripts.
- cmux: Implementation of the CMUX protocol
- pipe: Thread-safe async data-in/data-out binding layer between
modem modules.
- ppp: Implementation of the PPP protocol, binding the Zephyr PPP
L2 stack with the data-in/data-out pipe.
These modules use the abstract pipes to communicate between each
other. To bind them with the hardware, the following backends
are provided:
- TTY: modem pipe <-> POSIX TTY file
- UART: modem pipe <-> UART, async and ISR APIs supported
The backends are used to abstract away the physical layer, UART,
TTY, IPC, I2C, SPI etc, to a modem modules friendly pipe.
Signed-off-by: Bjarki Arge Andreasen <baa@trackunit.com>
