NxScope Library

This library provides real-time data logging functionality for NuttX.

The principle of action is to accumulate data gathered in virtual channels and periodically send buffered data through a dedicated interface packed with a custom protocol.

Supported features:

• up to 255 channels possible
• support for standard data types and user-specific data (enum nxscope_sample_dtype_e)
• support for vector data or point data
• support for character-based channels (text messages)
• support for channel metadata - can be used to enumerate samples or timestamp
• stream buffer overflow detection (NXSCOPE_STREAM_FLAGS_OVERFLOW)
• remote control with commands (enum nxscope_hdr_id_e)
• protocol and interface implementation can be different for control commands and stream data
• (optional) support for user-specific commands (NXSCOPE_HDRID_USER and struct nxscope_callbacks_s)
• (optional) support for samples divider (CONFIG_LOGGING_NXSCOPE_DIVIDER)
• (optional) support for ACK frames (CONFIG_LOGGING_NXSCOPE_ACKFRAMES)
• (optional) support for user-defined types (CONFIG_LOGGING_NXSCOPE_USERTYPES)
• (optional) support for non-buffered critical channels (CONFIG_LOGGING_NXSCOPE_CRICHANNELS)

A custom interface and a custom protocol can be implemented with struct nxscope_intf_s and struct nxscope_proto_s structures.

Supported interfaces:

1. a serial port: logging/nxscope/nxscope_iser.c
2. a dummy interface for debug purposes: logging/nxscope/nxscope_idummy.c

A default serial protocol is implemented in apps/logging/nxscope/nxscope_pser.c It just packs NxScope data into simple frames with a CRC-16 checksum.

External tools

• Nxslib - a Python (3.10+) client library for NxScope devices,
• Nxscli - a Python (3.10+) command-line interface for NxScope, supporting data capture and visualization