BUSFAULT | Bus fault exception

What This Code Means

Where Users Usually See This Code

• Fault handler logs
• During peripheral initialization or I/O operations

Why This Code Appears

• Invalid pointer to peripheral/memory map
• Clock/gating configuration makes a peripheral inaccessible
• Misconfigured DMA or bus timing issues

What Typically Happens Next

• Device resets or enters fault handler state

What This Code Is Not

• It is not a user-facing “app error”
• It is not a safe basis for electrical repair without documentation

Troubleshooting Checklist

• □ Capture fault registers and last accessed address when available
• □ Validate memory map addresses and peripheral initialization order
• □ Review clock enable and power domain settings

Notes And Edge Cases