Board Pinout Reference

When to Use

• •Starting work on a new hardware board
• •Needing GPIO pin assignments for display, touch, I2C, SPI, audio, etc.
• •Integrating a new peripheral or driver
• •Encountering pin conflicts or hardware init failures

Step 1: Check Existing Docs

Always check docs/ first. This is the single source of truth for hardware configuration:

// turbo
Get-ChildItem -Path "docs" -Filter "*.md" | ForEach-Object { Write-Host "  $_" }

If a reference file exists for your board (e.g., docs/hardware-reference.md), read it — it has:

• •Complete GPIO pin table
• •Bus configurations (SPI mode, I2C addresses, clock speeds)
• •Display initialization sequences
• •Known BSP compatibility issues
• •Component dependency list

Step 2: If No Docs Exist — Research Workflow

If you're targeting a board that isn't documented yet, follow this order to gather pin information efficiently:

2a. Check BSP Source (if available)

Board Support Packages contain pin definitions in header files:

// turbo
# Search for pin definitions in managed_components
Select-String -Path "managed_components" -Include "*.h" -Pattern "GPIO_NUM_" -Recurse | Select-Object -First 30

2b. Check Manufacturer Examples

Look for example code from the board manufacturer (usually on GitHub). For Waveshare boards:

• •Repository: github.com/waveshareteam/Waveshare-ESP32-components
• •BSP headers contain #define pin assignments

2c. Check Schematic/Datasheet

If pins aren't in code, check the manufacturer wiki/schematic PDF. Note that some pins (like LCD/touch reset) may be routed through an IO expander rather than direct GPIO.

Step 3: Document What You Find

Create or update docs/hardware-reference.md with the following sections:

# [Board Name] Hardware Reference

## Board Overview
- MCU, Flash, PSRAM specs
- Display type, resolution, controller
- Touch controller type, interface
- Other peripherals

## GPIO Pin Assignments
| Function | GPIO | Notes |
|---|---|---|

## Bus Configurations
- SPI host, mode, clock speed
- I2C port, address, speed

## Init Sequences
- Display initialization commands

## BSP Compatibility Notes
- Known issues with specific IDF versions
- Macro compatibility warnings
- Workarounds

## Component Dependencies
| Component | Version | Purpose |
|---|---|---|

Currently Documented Boards