# `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](https://github.com/railab/nxslib) - a Python (3.10+) client library for NxScope devices,
- [Nxscli](https://github.com/railab/nxscli) - a Python (3.10+) command-line interface for NxScope,
supporting data capture and visualization