How Can I Fix the Display Flickering when I use ClearScreen() or fillScreen() for recording of new screen data?.

[Knottis]

[mrcodetastic]

You need to enable double buffering and then flip across to the DMA 'back' buffer that has been updated in the background.

Look at the 'SmoothDoubleBuffer' example.

Or if you want your own buffer using FastLED, then look at the 'ChainedPanelsScreenBuffer' as well.

[Knottis]

Thanks for your help

Have now inserted “mxconfig.double_buff = true” and “dma_display->flipDMABuffer()” then flickering disappeared from the display.

Hope you can create a simple guide and program example for us beginners on how to get started easily and which step we should be taken care of.

Thanks again!
Regards, Knottis
(Sorry for my bad English)

Program update Ver.1.1

//####################################################################################
#include <ESP32-HUB75-MatrixPanel-I2S-DMA.h>

// FONTS
#include <Fonts/FreeSansBold24pt7b.h>

#define PANEL_RES_X 64 // Number of pixels wide of each INDIVIDUAL panel module.
#define PANEL_RES_Y 64 // Number of pixels tall of each INDIVIDUAL panel module.

#define NUM_ROWS 1 // Number of rows of chained INDIVIDUAL PANELS
#define NUM_COLS 3 // Number of INDIVIDUAL PANELS per ROW
#define PANEL_CHAIN NUM_ROWS * NUM_COLS // Total number of panels chained one to another

// Change this to your needs, for details on VirtualPanel pls read the PDF!
#define SERPENT true
#define TOPDOWN false

// placeholder for the matrix object
MatrixPanel_I2S_DMA *dma_display = nullptr;

void setup() {
// Module configuration
HUB75_I2S_CFG mxconfig(
PANEL_RES_X, // module width
PANEL_RES_Y, // module height
PANEL_CHAIN // chain length
);

//----------------------------------------------------------------------------------------------------
mxconfig.double_buff = true; // Turn ON double buffer - Use double buffer (twice amount of RAM required)
//----------------------------------------------------------------------------------------------------

// OK, now we can create our matrix object
dma_display = new MatrixPanel_I2S_DMA(mxconfig);
}

void loop() {
// Clear Screen
// Clear dma_display…
dma_display->clearscreen();
// let's adjust default brightness to about 195 ==>> 75%
dma_display->setBrightness8(195);

// Time
sprintf(Buffer, "%02d", hour(local));
TempString = Buffer;
TempString += ":";
sprintf(Buffer, "%02d", minute(local));
TempString += Buffer;
TempString += ":";
sprintf(Buffer, "%02d", second(local));
TempString += Buffer;
//
// Set Tekstfont
dma_display->setFont(&FreeSansBold24pt7b);
// Set Coler - RED
dma_display->setTextColor(dma_display->color565(255, 255, 255));
dma_display->setCursor(6, 40);
//
// Show the new Time-data on the display
dma_display->print(TempString);
//
//----------------------------------------------------------------------------------------------------
dma_display->flipDMABuffer(); // IMPORTANT -> SEND Pixel Buffer to DMA / Panel Output!
//----------------------------------------------------------------------------------------------------
delay(1000);
}

//####################################################################################

[AhsenDogan01]

I am having the same problem. but if I set the "mxconfig.double_buff" variable to true, it doesn't work at all and I can't get a picture on the screen.I tried the examples about it, but it still doesn't work.But if I set the value to false it works but this time it flickers as it appears in the video. How can i solve this problem ?

[mrcodetastic]

@AhsenDogan01 - I need more details on the esp32 device your using, type of panels, number of panels, code. Etc.

Impossible to debug otherwise

[mrcodetastic]

Debug output would be useful as well.

[AhsenDogan01]

//Microcontroller :ESP32S NodeMCU
//Panel : 1/8 scan , driver : MBI15124 , P10 16X32
//I use to 2xROWS 2xCOLS

#include "Arduino.h"
#include "ESP32-HUB75-MatrixPanel-I2S-DMA.h"
#include "ESP32-VirtualMatrixPanel-I2S-DMA.h"
#include "FreeMono9pt7b.h"

// Panel configuration
#define PANEL_RES_X 32 // Number of pixels wide of each INDIVIDUAL panel module.
#define PANEL_RES_Y 16 // Number of pixels tall of each INDIVIDUAL panel module.

#define NUM_ROWS 2 // Number of rows of chained INDIVIDUAL PANELS
#define NUM_COLS 2 // Number of INDIVIDUAL PANELS per ROW

// Change this to your needs, for details please read the PDF in
// the 'ChainedPanels'example folder!
#define SERPENT true
#define TOPDOWN true

int PANEL_CHAIN = NUM_ROWS*NUM_COLS;

// placeholder for the matrix object
MatrixPanel_I2S_DMA *dma_display = nullptr;

// placeholder for the virtual display object
VirtualMatrixPanel *virtualDisp = nullptr;

/******************************************************************************

• Setup!
  ******************************************************************************/
  void setup()
  {
  HUB75_I2S_CFG mxconfig(
  PANEL_RES_X, // module width
  PANEL_RES_Y, // module height
  PANEL_CHAIN // chain length
  );

mxconfig.driver = HUB75_I2S_CFG::MBI5124;

mxconfig.clkphase = true;
mxconfig.double_buff = false; // It doesn't work if i do "true"

dma_display = new MatrixPanel_I2S_DMA(mxconfig);

dma_display->setBrightness8(255);    

dma_display->begin();

virtualDisp = new VirtualMatrixPanel((*dma_display),NUM_ROWS,NUM_COLS, PANEL_RES_X, PANEL_RES_Y, SERPENT, TOPDOWN);

dma_display->fillScreen(dma_display->color565(255, 0, 0));
delay(500);
dma_display->fillScreen(dma_display->color565(0, 255, 0));
delay(500);
dma_display->fillScreen(dma_display->color565(0, 0, 255));
delay(500);
dma_display->clearScreen();

virtualDisp->setTextWrap(false);

}

void loop()
{
dma_display->clearScreen();

    virtualDisp->setFont(&FreeMono9pt7b);
    virtualDisp->setTextSize(1);
    virtualDisp->setTextColor(virtualDisp->color565(0, 0, 255));
    virtualDisp->setCursor(0, 26);
    virtualDisp->print("HELLO");

    //dma_display->flipDMABuffer(); // Not Working
    
    delay(1000);

}

[mrcodetastic]

//Panel : 1/8 scan , driver : MBI15124 , P10 16X32

Per the readme the library doesn't support 1/8 scan panels out of the box. Use the One_Eight_1_8_ScanPanel scan example

[AhsenDogan01]

I tried this. but the result is still the same. When I set the "mxconfig.double_buff" variable to "true", no image appears on the screen.

[Knottis]

My "To-Do" list when I use the HUB75-MatrixPanel-DMA

---

Always use approved drivers Panel Chips

P2-128x64-32S-V40 LED 1515 -> FM6124
P3-64x64-32S-2012-16B (P3-20190103) -> RUC7258D
https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA

Controll the Wiring to the ESP32-S3-WROOM-1 with the "HUB75-MatrixPanel-DMA" Software Driver

When you Updates the “Software Driver” remember to insert NEW value to E _PIN_DEFAULT in the file esp32s3-default-pins.hpp

I use Pin-17 to E _PIN_DEFAUL

esp32s3-default-pins.hpp

C:\Users\XXYYZZ\Documents\Arduino\libraries\ESP32_HUB75_LED_MATRIX_PANEL_DMA_Display\src\platforms\esp32s3\esp32s3-default-pins.hpp

#define R1 _PIN_DEFAULT 4
#define G1 _PIN_DEFAULT 5
#define B1 _PIN_DEFAULT 6
#define R2 _PIN_DEFAULT 7
#define G2 _PIN_DEFAULT 15
#define B2 _PIN_DEFAULT 16

#define A _PIN_DEFAULT 18
#define B _PIN_DEFAULT 8
#define C _PIN_DEFAULT 3
#define D _PIN_DEFAULT 42
#define E _PIN_DEFAULT 17

#define LAT _PIN_DEFAULT 40
#define OE _PIN_DEFAULT 2
#define CLK _PIN_DEFAULT 41