Cedric Roux
c0c3a737ed
We don't work much on asn1c. The version we use has several bugs. There is an active community out there that fixes bugs and improves asn1c. Let's use their version.
47 lines
1.8 KiB
Markdown
47 lines
1.8 KiB
Markdown
This directory contains the necessary schema files to generate all the LTE configuration data structures based on the ASN.1 RRC
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source code from the 36.331 RRC specifications. These structures are used by MAC and PHY for configuration purposes.
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It contains the following files
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```
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README.txt : This file
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ASN.1 : Directory to place asn1c package
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ASN.1/extract_asn1_from_spec.pl : Pearl script to extract ASN.1 source from 36311-860.txt
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ASN.1/*.asn1 : Extracted ASN.1 sources
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ASN.1/*.cmake : Definitions of which files the corresponding *.asn1 will generate
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CMakeLists.txt : The "driver" to generate and build generated source files at build time
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```
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Instructions to build data structures from ASN1 sources
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The asn.1 files have already been built using the `extract_asn1_from_spec.pl`
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Pearl script. This should be used again if a newer version of the RRC spec is
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used to synthesize the data structures and encoding/decoding routines. To do
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this:
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1. use Microsoft WORD to generate a text version of the 3GPP 36.331 document
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2. run the script on the text file to generate the `*.asn1` file
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You should install the asn1c utility using `./build_oai -I`.
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Run
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```bash
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ASN1C_PREFIX=LTE_ asn1c -pdu=all -fcompound-names -gen-UPER -no-gen-BER -no-gen-JER -no-gen-OER -no-gen-APER -no-gen-example -D <dir> <asn.1-file>
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```
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to generate the files that result from the asn.1-file. Create an `ASN.1/*.cmake` file
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with the following structure:
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```
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set(LTE_RRC_GRAMMAR <path-to-asn.1-file>)
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set(lte_rrc_source
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<list-of-c-files>
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)
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set(lte_rrc_headers
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<list-of-h-files>
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)
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```
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Modify the CMakeLists.txt to point to the newly generated .cmake file. On the
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next LTE RRC compilation, the source files will be automatically generated from
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the ASN.1 file and built henceforth.
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