33 lines
1.7 KiB
Markdown
33 lines
1.7 KiB
Markdown
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# `NxScope Library`
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This library provides real-time data logging functionality for NuttX.
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The principle of action is to accumulate data gathered in virtual channels
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and periodically send buffered data through a dedicated interface packed
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with a custom protocol.
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Supported features:
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- up to 255 channels possible
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- support for standard data types and user-specific data (`enum nxscope_sample_dtype_e`)
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- support for vector data or point data
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- support for character-based channels (text messages)
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- support for channel metadata - can be used to enumerate samples or timestamp
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- stream buffer overflow detection (`NXSCOPE_STREAM_FLAGS_OVERFLOW`)
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- remote control with commands (`enum nxscope_hdr_id_e`)
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- protocol and interface implementation can be different for control commands and stream data
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- (optional) support for user-specific commands (`NXSCOPE_HDRID_USER` and `struct nxscope_callbacks_s`)
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- (optional) support for samples divider (`CONFIG_LOGGING_NXSCOPE_DIVIDER`)
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- (optional) support for ACK frames (`CONFIG_LOGGING_NXSCOPE_ACKFRAMES`)
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- (optional) support for user-defined types (`CONFIG_LOGGING_NXSCOPE_USERTYPES`)
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- (optional) support for non-buffered critical channels (`CONFIG_LOGGING_NXSCOPE_CRICHANNELS`)
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A custom interface and a custom protocol can be implemented with
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`struct nxscope_intf_s` and `struct nxscope_proto_s` structures.
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Supported interfaces:
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1. a serial port: `logging/nxscope/nxscope_iser.c`
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2. a dummy interface for debug purposes: `logging/nxscope/nxscope_idummy.c`
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A default serial protocol is implemented in `apps/logging/nxscope/nxscope_pser.c`
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It just packs NxScope data into simple frames with a CRC-16 checksum.
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