69 lines
6.5 KiB
Plaintext
69 lines
6.5 KiB
Plaintext
NOTICE:
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=======
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This document should be opened in a text editor with a width of at least 150 characters.
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alt1250 usrsock daemon
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======================
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This software module is a usrsock daemon in NuttX for ALT1250 modem.
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The ALT1250 modem is a modem provided by Sony Semiconductor Israel. And it supports LTE Cat-M1 and NB-IoT network.
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Implementation Structure
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========================
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Call registerd functions
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<-------------------------------------------------+
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+-------------------------------------------------------------------------------------------------------------------------------- | -------------+
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| alt1250_daemon | |
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| ~~~~~~~~~~~~~~ Response | |
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| +----------------------------------------------------------------------------------+ | |
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| | | | |
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| V Response _________________________________________________________ | +--------------------------+ |
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| +------------- | usrsock handlers | post process | | +-------------> | Event call back task | |
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| | +_____________________________________+_________________+ | | +--> | to an application | |
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| | | socket handler | postproc_socket | | | | +--------------------------+ |
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| | |D | bind handler | postproc_bind | | | | |
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| | |I | listen handler | postproc_listen | <-----+ | | | |
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| | |S | . | . | | | | | |
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| | |P | . | . | Call | | | | |
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| | +-----> |A | . | . | Back | | | Event | |
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| | | |T |---------------+---------------------+-----------------| | | | Message | |
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| | | |C | ioctl handler | lapi power handler | postproc_XXXX | | | | | |
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| | | |H | lapi normal handler | postproc_XXXX | | | | | |
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| | | | | lapi ifreq handler | postproc_XXXX | ___________________________________________________________________ |
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| | | usrsock | lapi ltecmd handler | postproc_XXXX | | Command Reply | Reset Event | Asynchronous Event | Select Event | |
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| | | request | | . | . | |-----------------------------------------------------------------| |
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| | | | . | . | | Device event handling | |
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| | | +-------------------------------------------------------+ +-----------------------------------------------------------------+ |
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| | | | | / |
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+-- | - | ---------------------------------- | ------------------ | ------------------------------------ | --------------------------------------+
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| | | Send Command | | Event notify
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V | V V |
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-- /dev/usrsock -- ----------------------------------- /dev/alt1250 -----------------------------------
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+----------------+ +----------------------------------------------------------------------------------+
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| User Sock | | ALT1250 Device Driver |
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+----------------+ +----------------------------------------------------------------------------------+
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+---------------------------------------++-----------------------------------------+
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| SPI Driver || GPIO Driver |
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+---------------------------------------++-----------------------------------------+
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Behavior Overview
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=================
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Basically, alt1250_daemon receives a request from NutX User Sock and performs the expected processing according to the request.
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Each request is processed by its own "usrsock handler" depending on its type, and the result is returned to the User Sock as a
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response. To achieve each of these operations, the "usrsock handler" sends a command to the alt1250 device driver. The post process
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function is registerd in the command to process the command response if necessary.
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The command is sent to the ALT1250 via SPI, and the ALT1250 returns a response according to the command to notify alt1250_daemon.
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The alt1250_daemon receives the command response from that notification and either returns the response to User Sock or calls the
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"post process function" that was registered by the "usrsock handler". "post process" will return a response or send further
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commands to ALT1250 depending on the content of the request.
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The ALT1250 may make event notifications, and these notifications are asynchronous. ALT1250 asynchronous events are notified by the
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device driver as well as command responses, and when the alt1250_daemon receives them, it passes them to a task for callback to
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notify the user application.
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