Add ESP32-HUB75-MatrixPanel-DMA bus to WLED

[yangminglong]

Thank you for providing excellent. WLED provides an excellent software framework that allows users to customize functions。

Describe the solution you'd like
HUB75 is a common LED matrix panel interface, ESP32-HUB75-MatrixPanel-DMA is a popular driver library. It seems possible to add ESP32-HUB75-MatrixPanel-DMA as WLED bus to make WLED support HUB75-MatrixPanel。

[dosipod]

We have used the mrfaptastic DMA DIY project you linked with esp32 only without wled and the wiring picture will tell you that doing that with wled only without extra hardware is a long shot . In our DIY project the wifi did not work and the number of pins used is not ideal

Might be a more practical solution is to use something like https://github.com/Pixelvation/Pixelvation with wled

[yangminglong]

Thank you for your reply.
To simplify wiring, extra hardware is good, but not necessary. Wifi should not be a problem. I have followed mariobros-clock and RGB-Matrix-LED-Mario-Bros.-Clock project. WiFi works normally. NTP time can be obtained through WiFi.

Wiring, Recommended by ESP32-HUB75-MatrixPanel-DMA

Wiring the ESP32/ESP32-S2/ESP32-S3 to an LED Matrix Panel

If you want to change the GPIO mapping at runtime, simply provide the wanted pin mapping as part of the class initialization structure. For example, in your sketch have something like the following:

// Change these to whatever suits
#define R1_PIN 25
#define G1_PIN 26
#define B1_PIN 27
#define R2_PIN 14
#define G2_PIN 12
#define B2_PIN 13
#define A_PIN 23
#define B_PIN 19
#define C_PIN 5
#define D_PIN 17
#define E_PIN -1 // required for 1/32 scan panels, like 64x64px. Any available pin would do, i.e. IO32
#define LAT_PIN 4
#define OE_PIN 15
#define CLK_PIN 16

HUB75_I2S_CFG::i2s_pins _pins={R1_PIN, G1_PIN, B1_PIN, R2_PIN, G2_PIN, B2_PIN, A_PIN, B_PIN, C_PIN, D_PIN, E_PIN, LAT_PIN, OE_PIN, CLK_PIN};
HUB75_I2S_CFG mxconfig(
	64, // Module width
	32, // Module height
	2, // chain length
	_pins, // pin mapping
);
dma_display = new MatrixPanel_I2S_DMA(mxconfig);

Schematic_LED on url

[dosipod]

Interesting you can use wifi ,we only tested mrfaptastic DMA project a while back and did faced few issues with wifi but could be old build / info or we had an issue in our code . We will try to test multiple projects including the one you linked . If wifi is usable then could it be possible to add ArtNet or DDP support to your project ? if so then we can use wled on another mcu or even use something like xlights for animation and effects . I hope the ones you linked are easy to replicate

[dosipod]

Seems to me the pics you listed are from other project and not yours , if you personally tested wifi and it worked then show the code.

[witnessmenow]

@dosipod I've done a lot of work with the esp32 and Hub75, mainly just using the mtfapptsstics library.

I'm happy to run some tests if it would help, just let me know what you want me to try and I'll let you know

I have designed some open source hardware to connect to that makes that part a lot simpler (esp32 Trinity ), I'm also happy to provide one to a maintainer of wled if it would help the process

[dosipod]

Setup mtfapptsstics project and access wifi at same time . create a web server and see if it is stable . Once your tested that then share pics and video of the same along with code used

[witnessmenow]

Ok sure. I have definitely made projects in the past with a webserver and the matrix, but I'll make a minimum viable project and share it here.

…

On Mon 20 Mar 2023, 02:14 AlDIY, ***@***.***> wrote: Setup mtfapptsstics project and access wifi at same time . create a web server and see if it is stable . One your test that then share pics and video of the same along with code used — Reply to this email directly, view it on GitHub <#3072 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAL5PQSTCVNELGWB465MQIDW464Q5ANCNFSM6AAAAAAUNNXGX4> . You are receiving this because you commented.Message ID: ***@***.***>

[witnessmenow]

Here is a video of a project that has a web server running on an ESP32 while also controlling the matrix.

https://youtu.be/qho0EJC-cqE

The project is a modified "HelloServer" from the ESP32 webserver examples, combined with an example I have for just scrolling text.

Code for the example is here:

https://gist.github.com/witnessmenow/b12decb79b4c9c782d1c0af4c43559b6

Is this what you were looking for @dosipod ?

[dosipod]

Which hw you have use for that ?"ESP32 Trinity ?
Did you test on a regular esp32 . If extra HW is going to be used then https://github.com/Pixelvation/Pixelvation is cheaper and can be used with wled , the $30 for Trinity is the price of wifi . So it is still the case that wifi does not work with DMA project on regular esp32 unless you also tested that

[witnessmenow]

Yeah that's using a Trinity.

I'm not sure what you mean by "regular esp32"?

The Trinity is just a uniquely shaped esp32 dev board, it's nothing special. It's just a wroom module with an appropriate connector broken out for connecting to the display. All it has other than that from an esp32 point of view is a USB to serial and a 3.3v reg. Doesn't have any psram or anything like that.

Anything you can make with a Trinity you can make with any esp32 with enough pins broken out. Here is a wiring diagram that is equivalent logically to the Trinity.

link to Full size to actually read the pin numbers

As you mentioned in your earlier comment about doing it diy, there is a lot of connections and it's a bit of a pain, so the Trinity just makes it easier.

Trinity is fully open source so if people want to make their own, they are welcome to.