# grandideastudio/jtagulator architecture

> Architecture diagram of the GitHub repository grandideastudio/jtagulator, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-11-12). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/grandideastudio/jtagulator
- Repository: https://github.com/grandideastudio/jtagulator

## Overview

JTAGulator is an open-source hardware hacking tool for identifying on-chip debug interfaces from test points and similar contacts. The documented workflow is an operator using the device to investigate a target and identify an interface. The tree includes firmware and hardware artifacts, but no source excerpts were provided; therefore internal firmware stages and relationships between protocol modules cannot be verified. The graph shows only the documented workflow and the main firmware entry file.

Main entry points: [`JTAGulator.spin`](https://github.com/grandideastudio/jtagulator/blob/master/JTAGulator.spin) (JTAGulator firmware)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_device["JTAGulator device"]
  node_firmware["JTAGulator firmware<br/>[JTAGulator.spin]"]
end

node_operator(("Operator"))
node_target(("Target test points"))
node_interface["Debug interface"]

node_operator -->|"uses"| node_firmware
node_firmware -->|"investigates"| node_target
node_firmware -->|"identifies"| node_interface

click node_firmware "https://github.com/grandideastudio/jtagulator/blob/master/JTAGulator.spin"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_firmware toneBlue
class node_operator,node_target,node_interface toneIndigo
```

## Components

### JTAGulator device

- [JTAGulator firmware](https://github.com/grandideastudio/jtagulator/blob/master/JTAGulator.spin): `JTAGulator.spin`

### Other components

- **Operator**
- **Target test points**
- **Debug interface**

## Connections

- Operator → JTAGulator firmware: uses (evidence: `README.markdown`)
- JTAGulator firmware → Target test points: investigates (evidence: `README.markdown`)
- JTAGulator firmware → Debug interface: identifies (evidence: `README.markdown`)