ESP32-HUB75-MatrixPanel-DMA Issue with 64x64 panel based on DP5125D and DP32020A

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i got a new HUB75 Panel today and it does not seem to work properly with the library. The panel initializes fine and seems to display stuff but everything is mapped incorrectly and overlapping. the panel seemed to work more or less the same with different driver types, but it flickered with some the best one i found which worked is MBI5124 and I am using the same one in the below pictures.

also the panel is labelled as a QiangLi Q3

Here is the SimpleTestShapes demo (64x64)

simple_shapes

and here is the Plasma demo (64x64)

https://github.com/mrcodetastic/ESP32-HUB75-MatrixPanel-DMA/assets/58217787/3a7ad8ec-2ff1-41e6-bb8e-baef87be240b

So i there any way I can drive this panel properly?

Jun 20 '24 16:06 mzashh

Can You share a picture of your connections? E_pin present? Thanks in advance

Jun 20 '24 16:06 davemaster

Can You share a picture of your connections? E_pin present? Thanks in advance

like my other 64x64 hub75 panel (which works fine cuz different driver) the E and D pins are either labelled as GND or NC and yes i have connected those and defined them in my code. i did a continuity test on them and D which is labelled as NC is not grounded while as E is grounded so either the input is ABC or ABCD, no E pin

Jun 20 '24 17:06 mzashh

I think, the problem is in the fact that DP32020A is a shift register miltiplexor - do you know how to work with it? By the way - what is the scan factor of the panel?

so either the input is ABC or ABCD, no E pin

sure, a three pins is enough for shift register

Jun 20 '24 17:06 board707

I think, the problem is in the fact that DP32020A is a shift register miltiplexor - do you know how to work with it? By the way - what is the scan factor of the panel?

i am not sure how to work with it, the scan rate isn't mentioned either on the panel or where i bought it from but since the E pin is pretty much shorted to ground and D is no continuity to ground it is either a 1/16 or a 1/8 scan panel, pretty sure about 1/8 scan. i tried my code which works with my 32x32 1/8 scan panel but that does not work either. so it maybe a 1/8 scan but its wired pretty weirdly

i found this library https://github.com/ironsheep/P2-HUB75-LED-Matrix-Driver though it uses some proprietary hardware but it has support for DP5125D and states that the address is only ABC so 1/8 scan ig

Jun 20 '24 17:06 mzashh

since the E pin is pretty much shorted to ground and D is no continuity to ground it is either a 1/16 or a 1/8 scan panel, pretty sure about 1/8 scan.

As panel uses a shift register multiplexer, the number of ABC lines means nothing about scans. Please show a clear photo pf panel rear side

i found this library ... it has support for DP5125D

The DP5125 is a standard driver, you don't need a special library for it. The current library is definitely supports this driver.

Jun 20 '24 20:06 board707

Please show a clear photo pf panel rear side.

PXL_20240620_222850573

Jun 20 '24 20:06 mzashh

According to number of chips, the panel is 1/32scans

Jun 21 '24 06:06 board707

According to number of chips, the panel is 1/32scans

1/32 scan but no D and E pin man this is one weird panel, so any ideas on how to drive it?

Jun 21 '24 06:06 mzashh

1/32 scan but no D and E pin man this is one weird panel

Again, DP32020 is a shift register, it don't need more than ABC to control 32 scans. Read this, the part titled "HX6158" - it is an explanation how the SR multiplexors works.

Jun 21 '24 07:06 board707

this is one weird panel, so any ideas on how to drive it?

There is nothing weird about this panel. The 5125 driver is very common; some settings are needed only for the 32020 multiplexer. As far as I remember, @mrcodetastic had code for panels with such multiplexers. Now I need to get busy, a little later in the day I will find links in the "Issues" on such panels

Jun 21 '24 07:06 board707

~~The code to work with shift register multiplexors discussed in #164, #429 and some other issues.~~ (Correction) - the advice from #164 probably won't work with 32020 chip.

@mzashh Do you have an experience to use this library with a "standard" 1/32 panel? If so, I will show what to change in the code to work with your panel.

Jun 21 '24 11:06 board707

thanks for the help @board707 but seller has offered to replace my panel with a normal hub75e panel based on FM6124D + TC7262C driver, which i hope will work without any modifications. i have already packed my old panel for shipping it back so i cant really test stuff with it.

I will leave the issue open just in case someone else needs help with this type of panel in the future

Jun 21 '24 12:06 mzashh

Hi, I just received such a panel but I dont't really know which configuration I need to drive this. For now I got it to display something but there is always something missing or it doesn't power on at all. It uses the DP5125D chip.

Do you have an experience to use this library with a "standard" 1/32 panel? If so, I will show what to change in the code to work with your panel.

@board707 Do you know something how to make them work? Or are there any examples how to use them?

Thanks in advance :)

Some pics:

Dec 02 '24 19:12 AzonInc

I just received such a panel

Your panel is different from the one of @mzashh. The latter uses a 32020 shift register type line driver, while yours one equipped with VB5628 standard (138 type) chip.

According to chip types your matrix is ordinal two scan panel, that should works with standard library settings.

Dec 03 '24 06:12 board707

Thanks for the info, I just found the issue with my panel. They labelled the D pin with GND for no reason. It can't work that way, now it finally works as expected :)

Dec 03 '24 23:12 AzonInc

Hello All, Is there any exact solution to drive the panel with DP5125D and DP32020A chips? I got a 64x32 panel and now Houston I have a problem :) I don't understand what is DI at pin4 ?

May 19 '25 10:05 nadir-dogan

Is there any exact solution to drive the panel with DP5125D and DP32020A chips?

The driver DP5125D is the standard one and not a problem. As about a line switcher DP32020 - it is of a "shift register type" which needs an additional setup.

In case that we use panels based on that chips, we have to set an option:

mxconfig.driver = HUB75_I2S_CFG::DP3246_SM5368;

before creating MatrixPanel_I2S_DMA object

see #781

May 19 '25 11:05 board707

@board707 thanks you for your quick reply. I had many tries after got your reply but unfortunately there is not a good result. Please see my whole code and the pictures. I'm rooky on this rgb panels, I just started a few days ago.

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

#define R1_PIN 18 #define G1_PIN 14 #define B1_PIN 16 #define R2_PIN 17 #define G2_PIN 13 #define B2_PIN 21 #define A_PIN 34 #define B_PIN 8 #define C_PIN 36 #define D_PIN 4 #define LAT_PIN 2 #define OE_PIN 40 #define CLK_PIN 38 #define E_PIN 10

/********** CONFIG *************/ #define PANEL_WIDTH 64 #define PANEL_HEIGHT 32 #define PANELS_NUMBER 1

MatrixPanel_I2S_DMA *dma_display = nullptr;

void setup() { Serial.begin(115200);

HUB75_I2S_CFG mxconfig; mxconfig.mx_width = PANEL_WIDTH; mxconfig.mx_height = PANEL_HEIGHT; mxconfig.chain_length = PANELS_NUMBER; mxconfig.gpio.r1 = R1_PIN; mxconfig.gpio.g1 = G1_PIN; mxconfig.gpio.b1 = B1_PIN; mxconfig.gpio.r2 = R2_PIN; mxconfig.gpio.g2 = G2_PIN; mxconfig.gpio.b2 = B2_PIN; mxconfig.gpio.a = A_PIN; mxconfig.gpio.b = B_PIN; mxconfig.gpio.c = C_PIN; mxconfig.gpio.d = D_PIN; mxconfig.gpio.e = E_PIN; mxconfig.gpio.lat = LAT_PIN; mxconfig.gpio.oe = OE_PIN; mxconfig.gpio.clk = CLK_PIN;

//mxconfig.driver = HUB75_I2S_CFG::DP3246_SM5368;

dma_display = new MatrixPanel_I2S_DMA(mxconfig); dma_display->begin(); dma_display->setBrightness8(70); dma_display->setCursor(0, 0); dma_display->print("HELLO");

// draw a blue circle dma_display->drawCircle(10, 10, 10, dma_display->color444(0, 0, 15)); }

void loop() {}

included line like this mxconfig.driver = HUB75_I2S_CFG::DP3246_SM5368;

excluded line like this //mxconfig.driver = HUB75_I2S_CFG::DP3246_SM5368;

May 19 '25 13:05 nadir-dogan

//mxconfig.driver = HUB75_I2S_CFG::DP3246_SM5368;

Why this line is commented out?

May 19 '25 13:05 board707

I had tried with and without the line, you may see two picture.

May 19 '25 13:05 nadir-dogan

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

#define R1_PIN 18 #define G1_PIN 14 #define B1_PIN 16 #define R2_PIN 17 #define G2_PIN 13 #define B2_PIN 21 #define A_PIN 34 #define B_PIN 8 #define C_PIN 36 #define D_PIN 4 #define LAT_PIN 2 #define OE_PIN 40 #define CLK_PIN 38 #define E_PIN 10

/********** CONFIG *************/ #define PANEL_WIDTH 64 #define PANEL_HEIGHT 32 #define PANELS_NUMBER 1

MatrixPanel_I2S_DMA *dma_display = nullptr;

void setup() { Serial.begin(115200);

HUB75_I2S_CFG mxconfig; mxconfig.mx_width = PANEL_WIDTH; mxconfig.mx_height = PANEL_HEIGHT; mxconfig.chain_length = PANELS_NUMBER; mxconfig.gpio.r1 = R1_PIN; mxconfig.gpio.g1 = G1_PIN; mxconfig.gpio.b1 = B1_PIN; mxconfig.gpio.r2 = R2_PIN; mxconfig.gpio.g2 = G2_PIN; mxconfig.gpio.b2 = B2_PIN; mxconfig.gpio.a = A_PIN; mxconfig.gpio.b = B_PIN; mxconfig.gpio.c = C_PIN; mxconfig.gpio.d = D_PIN; mxconfig.gpio.e = E_PIN; mxconfig.gpio.lat = LAT_PIN; mxconfig.gpio.oe = OE_PIN; mxconfig.gpio.clk = CLK_PIN;

mxconfig.driver = HUB75_I2S_CFG::DP3246_SM5368;

dma_display = new MatrixPanel_I2S_DMA(mxconfig); dma_display->begin(); dma_display->setBrightness8(70);

dma_display->setCursor(0, 0); dma_display->print("1234567890");

// draw a blue circle //dma_display->drawCircle(10, 10, 10, dma_display->color444(0, 0, 15)); }

void loop() {}

May 19 '25 14:05 nadir-dogan

Could you please show a clear photo of the panel rear side?

May 19 '25 14:05 board707

Qiang Li Q5

May 19 '25 14:05 nadir-dogan

Your panel is 64x32 s1/8 - so it is a "four scan panel". To work with it you have to use a VirtualPanel class and manage a pixel mapping. Please run a Pixel_Mapping_Test and show the video.

May 19 '25 15:05 board707

it scans like these; 2 1 4 3

I could not upload full video cause of file size. 1 video and 2 pictures uploaded.

https://github.com/user-attachments/assets/60b38b15-27ec-48ec-bf0e-2c5d3a1647f6

May 19 '25 15:05 nadir-dogan

Slightly modified...

/************************************************************************* Description:

The underlying implementation of the ESP32-HUB75-MatrixPanel-I2S-DMA only supports output to HALF scan panels - which means outputting two lines at the same time, 16 or 32 rows apart if a 32px or 64px high panel respectively. This cannot be changed at the DMA layer as it would require a messy and complex rebuild of the library's internals.

However, it is possible to connect QUARTER (i.e. FOUR lines updated in parallel) scan panels to this same library and 'trick' the output to work correctly on these panels by way of adjusting the pixel co-ordinates that are 'sent' to the ESP32-HUB75-MatrixPanel-I2S-DMA library.

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

/* Use the Virtual Display class to re-map co-ordinates such that they draw correctly on a 32x16 1/4 or 64x32 1/8 Scan panel (or chain of such panels). */ #include "ESP32-VirtualMatrixPanel-I2S-DMA.h"

// Define custom class derived from VirtualMatrixPanel class CustomPxBasePanel : public VirtualMatrixPanel { public: using VirtualMatrixPanel::VirtualMatrixPanel; // inherit VirtualMatrixPanel's constructor(s)

protected:

VirtualCoords getCoords(int16_t x, int16_t y);  // custom getCoords() method for specific pixel mapping

};

// custom getCoords() method for specific pixel mapping inline VirtualCoords CustomPxBasePanel ::getCoords(int16_t x, int16_t y) {

coords = VirtualMatrixPanel::getCoords(x, y); // call base class method to update coords for chaining approach

if ( coords.x == -1 || coords.y == -1 ) { // Co-ordinates go from 0 to X-1 remember! width() and height() are out of range! return coords; }

//uint8_t pxbase = panelResX; // pixel base uint8_t pxbase = 32; // pixel base

// mapper for panels with 32 pixs height (64x32 or 32x32) if (panelResY == 32) { if ((coords.y & 8) == 0) { coords.x += ((coords.x / pxbase) + 1) * pxbase; // 1st, 3rd 'block' of 8 rows of pixels } else { coords.x += (coords.x / pxbase) * pxbase; // 2nd, 4th 'block' of 8 rows of pixels } coords.y = (coords.y >> 4) * 8 + (coords.y & 0b00000111); }

// mapper for panels with 16 pixs height (32x16 1/4) else if (panelResY == 16) { if ((coords.y & 4) == 0) { // 1. Normal line, from left to right coords.x += ((coords.x / pxbase) + 1) * pxbase; // 1st, 3rd 'block' of 4 rows of pixels //2. in case the line filled from right to left, use this (and comment 1st) //coords.x = ((coords.x / pxbase) + 1) * 2 * pxbase - (coords.x % pxbase) - 1; } else { coords.x += (coords.x / pxbase) * pxbase; // 2nd, 4th 'block' of 4 rows of pixels } coords.y = (coords.y >> 3) * 4 + (coords.y & 0b00000011); } return coords; }

// Panel configuration #define PANEL_RES_X 64 // Number of pixels wide of each INDIVIDUAL panel module. #define PANEL_RES_Y 32 // Number of pixels tall of each INDIVIDUAL panel module.

// Use a single panel for tests #define NUM_ROWS 1 // Number of rows of chained INDIVIDUAL PANELS #define NUM_COLS 1 // Number of INDIVIDUAL PANELS per ROW

// Chain settings, do not cnahge #define SERPENT true #define TOPDOWN false #define VIRTUAL_MATRIX_CHAIN_TYPE CHAIN_BOTTOM_RIGHT_UP

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

// placeholder for the virtual display object CustomPxBasePanel *FourScanPanel = nullptr;

/****************************************************************************** Setup! ******************************************************************************/ void setup() { HUB75_I2S_CFG mxconfig( PANEL_RES_X * 2, // DO NOT CHANGE THIS PANEL_RES_Y / 2, // DO NOT CHANGE THIS NUM_ROWS * NUM_COLS // DO NOT CHANGE THIS //,_pins // Uncomment to enable custom pins );

mxconfig.clkphase = false; // Change this if you see pixels showing up shifted wrongly by one column the left or right.

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

// let's adjust default brightness to about 75% dma_display->setBrightness8(40); // range is 0-255, 0 - 0%, 255 - 100%

// Allocate memory and start DMA display if ( not dma_display->begin() ) Serial.println("****** !KABOOM! I2S memory allocation failed ***********");

dma_display->clearScreen(); delay(500);

// create FourScanPanellay object based on our newly created dma_display object FourScanPanel = new CustomPxBasePanel ((*dma_display), NUM_ROWS, NUM_COLS, PANEL_RES_X, PANEL_RES_Y, VIRTUAL_MATRIX_CHAIN_TYPE);

}

void loop() { // for (int i = 0; i < 32; i++){ int i=0; for (int j = 0; j < 64; j++) { FourScanPanel->drawPixel(j, i, FourScanPanel->color565(0, 63, 0)); delay(10); } for (int j = 0; j < 64; j++) { FourScanPanel->drawPixel(j, i, FourScanPanel->color565(0, 0, 0)); delay(10); } // }

/* for (int i = 0; i < FourScanPanel->height(); i++) { for (int j = 0; j < FourScanPanel->width(); j++) { FourScanPanel->drawPixel(j, i, FourScanPanel->color565(127, 63, 0)); delay(10); Serial.print(j);Serial.print("-");Serial.println(i); } } */ delay(2000); dma_display->clearScreen(); } // end loop

https://github.com/user-attachments/assets/a9afd58d-595c-41b2-8fd2-99f631aee565

May 19 '25 17:05 nadir-dogan

Hi @nadir-dogan The code looks good, but you forgot to add an option string:

mxconfig.driver = HUB75_I2S_CFG::DP3246_SM5368;

Insert it just before the line:

dma_display = new MatrixPanel_I2S_DMA(mxconfig);

May 20 '25 09:05 board707

Dear @board707 , I think it looks like OK now. Thank you for your all help.

What I must understand about these settings? How is this panel? I was think all panels with HUB75 is same but I see a lot of panel is different each other...

#include "ESP32-VirtualMatrixPanel-I2S-DMA.h"

// Define custom class derived from VirtualMatrixPanel class CustomPxBasePanel : public VirtualMatrixPanel { public: using VirtualMatrixPanel::VirtualMatrixPanel; // inherit VirtualMatrixPanel's constructor(s)

protected:

VirtualCoords getCoords(int16_t x, int16_t y);  // custom getCoords() method for specific pixel mapping