HELP PLEASE ! 32x64 LED Matrix with Mega 2650

[superbyte]

I would really appreciate some help please. I am using a 32x64 matrix with an Arduino Mega 2650 board. I have striped down the code to work out where the issue but cannot seem to find it. The issue is , there are rows missing and some rows darker on startup. After 72 seconds (approx) it comes right. This seems to be very constant. I have tried changing different pins but get the same result. I have also tried different versions of the RGBmatrixpanel and Adafruit GFX libs but no joy. This is my test code

#include <RGBmatrixPanel.h>
#include "FreeSansBold12pt7b.h"

#define CLK 13 // 11
#define OE 9
#define LAT 10
#define A A0
#define B A1
#define C A2
#define D A3

/*Mega 2650
R1 24
G1 25
B1 26
R2 27
G2 28
B2 29
*/

RGBmatrixPanel matrix(A, B, C, D, CLK, LAT, OE, false, 64);

#define F2(progmem_ptr) (const __FlashStringHelper *)progmem_ptr
const char strMsg[] PROGMEM = " Hello World ";
int16_t textX = matrix.width(),
textMin = (int16_t)sizeof(strMsg) * -12;

String Message0 = "Hello World";
String Message1 = "1234567890";

void setup() {
matrix.begin();
matrix.fillScreen( 0x1000);
//splashScreen2();
}

Could you please help me. Thanking you in advance.

[b707]

To work with 32x64 panel you need connect a E pin

[UKHeliBob]

Welcome to the forum

@superbyte

This is my test code

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use code tags (the < CODE/ > icon above the compose window) to make it easier to read and copy for examination

https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum

Please post your sketch, using code tags when you do

Posting your code using code tags prevents parts of it being interpreted as HTML coding and makes it easier to copy for examination

In my experience the easiest way to tidy up the code and add the code tags is as follows

Start by tidying up your code by using Tools/Auto Format in the IDE to make it easier to read. Then use Edit/Copy for Forum and paste what was copied in a new reply. Code tags will have been added to the code to make it easy to read in the forum thus making it easier to provide help.

It is also helpful to post error messages in code tags as it makes it easier to scroll through them and copy them for examination

[superbyte]

Hi Bob
Thank you so much for your prompt response. My LED panel doesn't have a E pin.
I tried it now by adding in software and got an error as
RGBmatrixPanel doesn't need the E pin. <RGBmatrixPanel(uint8_t a, uint8_t b, uint8_t c, uint8_t d, uint8_t clk,uint8_t lat, uint8_t oe, boolean dbuf, uint8_t width = 32 / >

Attached you will find the panel after startup and then 72 seconds later and the pinouts of my LED panel.

[b707]

Please show a clear photo of the panel rear side. It seems that your panel has a 1/8 scan factor.

Also it would be helpful if you could to read an indexes on the chips on the panel. The panel most probably should be equipped with three types of IC.