ScStw/ESP32-HUB75-MatrixPanel-DMA
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Updated README for new custom pin mapping

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README.md
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@ -25,20 +25,51 @@ Please refer section 3.3. in https://www.espressif.com/sites/default/files/docum
# Wiring ESP32 with the LED Matrix Panel
If you wish to change this, you will need to adjust in the header file (ESP32-RGB64x32MatrixPanel-I2S-DMA.h).
By default the pin mapping is as follows (defaults defined in ESP32-RGB64x32MatrixPanel-I2S-DMA.h).
```
+-----------+ Panel - ESP32 pins
| R1 G1 | R1 - IO25 G1 - IO26
| B1 GND | B1 - IO27
| R2 G2 | R2 - IO14 G2 - IO12
| B2 GND | B2 - IO13
| A B | A - IO23 B - IO22
| C D | C - IO 5 D - IO17
| CLK LAT | CLK - IO16 LAT - IO 4
| OE GND | OE - IO15
HUB 75 PANEL ESP 32 PIN
+-----------+
| R1 G1 | R1 -> IO25 G1 -> IO26
| B1 GND | B1 -> IO27
| R2 G2 | R2 -> IO14 G2 -> IO12
| B2 GND | B2 -> IO13
| A B | A -> IO23 B -> IO22
| C D | C -> IO 5 D -> IO17
| CLK LAT | CLK -> IO16 LAT -> IO 4
| OE GND | OE -> IO15 GND -> ESP32 GND
+-----------+
```
![The default pin mapping is best for a LOLIN D32](WiringExample.jpg)
However, if you want to change this, simply provide the wanted pin mapping as part of the display.begin() call. 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 22
#define C_PIN 5
#define D_PIN 17
#define E_PIN -1
#define LAT_PIN 4
#define OE_PIN 15
#define CLK_PIN 16
display.begin(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 ); // setup the LED matrix
```
The panel must be powered by 5V AC adapter with enough current capacity. (Current varies due to how many LED are turned on at the same time. To drive all the LEDs, you need 5V4A adapter.)