[Bug Report] Display Ghosting and Color Inconsistency Issues with ESP32-HUB75-MatrixPanel-DMA Library on P3 RGB LED Panel (MBI5124)

[neiloe8023]

[Bug Report] Ghost Image Issues with ESP32-HUB75-MatrixPanel-DMA Library on MBI5124 Driven P3 Panel

Hardware Setup

• Controller: ESP32-S3
• LED Panel: P3 Full-Color LED Module
  • Size: 144mm x 48mm
  • Resolution: 16(H) × 48(W)
  • Driver IC: MBI5124
  • Scan Mode: 1/16 dual scan
  • LED Type: 2121 LED

Issue Description

When using the ESP32-HUB75-MatrixPanel-DMA library to drive the above panel, the following display issues occur:

1. Text Scrolling Effect Shows Ghost Images

   • Yellow text displays with blue and purple trailing effects
   • Ghost images are particularly noticeable during text movement

2. Bouncing Rectangle Animation

   • Slight ghosting when displaying cyan rectangle
   • Inconsistent color appearance in the middle of the rectangle

Attempted Solutions

1. Adjusted driver configuration:
   cpp
   mxconfig.driver = HUB75_I2S_CFG::MBI5124;
   mxconfig.clkphase = false;
   mxconfig.double_buff = false;

2. Used basic color values (0-7) instead of RGB565

3. Implemented independent pixel control and buffer management

4. Adjusted refresh timing and delays

Expected Behavior

• Text scrolling should display solid colors without ghosting
• Rectangle animation should show uniform color without inconsistencies

Additional Notes

1. Custom low-level driver code works correctly without ghosting issues
2. Issues only occur when using the ESP32-HUB75-MatrixPanel-DMA library

[VonHirsch]

Power Supply?

[neiloe8023]

Power Supply?

Thank you for your quick response! The power supply is 5V 3A. Is there any issue with that?

[VonHirsch]

Power should be good unless it's one of those "phone charger" supplies.

You might have to shorten your wiring. See here: #134

[mrcodetastic]

This looks to be an electrical issue and not a result of this library.

Do you have ground pin(s) connected between the HUB75 and the ESP32?