f469disco-lcd-test.rs example fails on STM32F469I-DISCO B08 board revision (NT35510 LCD controller)

[Amperstrand]

Problem

The f469disco-lcd-test.rs example does not work correctly on the STM32F469I-DISCO AU1 (B08) board revision. The LCD screen displays a white background with visual noise or garbled output instead of the expected test patterns.

Symptoms

• Display shows white background with visual noise/corruption
• No recognizable test patterns
• Matches symptoms reported in ST Community posts:
  • STM32F769I-DISCO really noisy TFT LCD display
  • STM32F469I-Discovery TouchGFX not working

Root Cause

The STM32F469I-DISCO B08 board revision uses a different LCD controller:

• B08: NT35510
• B07 and earlier: OTM8009A

The current example only supports the OTM8009A controller.

Reference Implementation

STMicroelectronics added support for the NT35510 controller in their STM32CubeH7 BSP drivers:

• Commit adding NT35510 support

Solution

• ✅ Auto-detects the LCD controller (NT35510 vs OTM8009A)
• ✅ Implements an inline NT35510 driver based on the ST reference implementation
• ✅ Falls back to OTM8009A for older board revisions
• ✅ Maintains backward compatibility

The updated example now works correctly across board revisions.

Testing

Tested successfully on:

• ✅ STM32F469I-DISCO B08 board (NT35510)
• ✅ Fallback logic for OTM8009A (B07 and earlier)

Next Steps

Would you like me to submit a pull request with these changes?

[burrbull]

Would you like me to submit a pull request with these changes?

Sure. You should not ask if you have a fix.