ScStw/ESP32-HUB75-MatrixPanel-DMA
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Add a note on how to setup with Adafruit boards

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Hey, amazing library!

I struggled for a while to work with my Adafruit MatrixPortal S3, I'm totally new to this so I had no idea where to find the pinouts. Adding something like this to the README would have saved me an hour :)

I'm not sure if there's a better canonical source for the pinout info than the Adafruit example source code? Happy to change!

Thanks :)
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@ -141,6 +141,50 @@ Various people have created PCBs for which one can simply connect an ESP32 to a
Please contact or order these products from the respective authors.
### How can I configure it to work with an off-the-shelf board/shield with HUB75 connector, e.g. Adafruit MatrixPortal?
You need to find the correct pin mapping for your board. For Adafruit boards/shields, you can look in one of the examples provided with the Protomatter library, for example [here](https://github.com/adafruit/Adafruit_Protomatter/blob/master/examples/doublebuffer_scrolltext/doublebuffer_scrolltext.ino). Find your board variant, copy the pin values into the `#define`s described above, and pass the pin mapping into your `mxconfig`.
For example, for MatrixPoral S3, the Protomatter example file contains the following:
```
uint8_t rgbPins[] = {42, 41, 40, 38, 39, 37};
uint8_t addrPins[] = {45, 36, 48, 35, 21};
uint8_t clockPin = 2;
uint8_t latchPin = 47;
uint8_t oePin = 14;
```
which for use with this library, converts to:
```
#define R1_PIN 42
#define G1_PIN 41
#define B1_PIN 40
#define R2_PIN 38
#define G2_PIN 39
#define B2_PIN 37
#define A_PIN 45
#define B_PIN 36
#define C_PIN 48
#define D_PIN 35
#define E_PIN 21
#define LAT_PIN 47
#define OE_PIN 14
#define CLK_PIN 2
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};
// Module configuration
HUB75_I2S_CFG mxconfig(
PANEL_RES_X, // module width
PANEL_RES_Y, // module height
PANEL_CHAIN, // Chain length
_pins // Pin mapping
);
```
### Can I use with a larger panel (i.e. 64x64px square panel)?
If you want to use with a 64x64 pixel panel (typically a HUB75*E* panel) you MUST configure a valid *E_PIN* to your ESP32 and connect it to the E pin of the HUB75 panel! Hence the 'E' in 'HUB75E'