v1.7.0 - LED and SD Card Settings Fix

🎯 Firmware Release v1.7.0

Fixes

• LED Changes Now Work: CV_OUT_2 LED responds to overdrive toggle button B7
• Settings File Creation: SD card now creates (8 bytes) with persistence
• Enhanced Diagnostics: Clear LED feedback patterns (2 quick = success, 4 slow = SD error)

Root Cause

The SDSettings storage object was placed in AXI SRAM with which caused FatFS mount state corruption due to NOLOAD attribute preventing proper initialization.

Technical Changes

• Removed problematic SRAM section placement from SDSettings
• Moved storage object to regular RAM to preserve mount state
• Added explicit LED state tracking and filesystem remount logic
• Enhanced error diagnostics distinguish different SD failures

LED Feedback Patterns

• 2 quick pulses: Settings saved successfully
• 4 slower pulses: SD card mount error (happens when card removed/reinserted)
• 3 medium pulses: File write failure
• 5 very slow pulses: Filesystem mount failure

Your firmware now reliably handles SD card settings with clear visual diagnostics. Settings persist across reboots and CV_OUT_2 LED provides visual feedback for overdrive state.

Built using STM32H750 toolchain.