Added ability to define custom pin mappings

Closes issue #4

Use something like:
' 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'

with R1_PIN etc. referring to your own define or constant variables

2 files changed, 59 insertions, 21 deletions

diff --git a/ESP32-RGB64x32MatrixPanel-I2S-DMA.cpp b/ESP32-RGB64x32MatrixPanel-I2S-DMA.cpp
index 02f8148..988650d 100644
--- a/ESP32-RGB64x32MatrixPanel-I2S-DMA.cpp
+++ b/ESP32-RGB64x32MatrixPanel-I2S-DMA.cpp
@@ -3,7 +3,7 @@
 // Credits: Louis Beaudoin <https://github.com/pixelmatix/SmartMatrix/tree/teensylc>
 // and Sprite_TM: 			https://www.esp32.com/viewtopic.php?f=17&t=3188 and https://www.esp32.com/viewtopic.php?f=13&t=3256
 
-void RGB64x32MatrixPanel_I2S_DMA::configureDMA()
+void RGB64x32MatrixPanel_I2S_DMA::configureDMA(int r1_pin, int  g1_pin, int  b1_pin, int  r2_pin, int  g2_pin, int  b2_pin, int  a_pin, int   b_pin, int  c_pin, int  d_pin, int  e_pin, int  lat_pin, int   oe_pin, int clk_pin)
 {
     // calculate the lowest LSBMSB_TRANSITION_BIT value that will fit in memory
     int numDescriptorsPerRow;
@@ -146,9 +146,26 @@ void RGB64x32MatrixPanel_I2S_DMA::configureDMA()
 
     Serial.printf("Performing I2S setup.\n");
 
+	/*
     i2s_parallel_config_t cfg={
-        .gpio_bus={R1_PIN, G1_PIN, B1_PIN, R2_PIN, G2_PIN, B2_PIN, LAT_PIN, OE_PIN, A_PIN, B_PIN, C_PIN, D_PIN, E_PIN, -1, -1, -1},
-        .gpio_clk=CLK_PIN,
+        .gpio_bus={R1_PIN_DEFAULT, G1_PIN_DEFAULT, B1_PIN_DEFAULT, R2_PIN_DEFAULT, G2_PIN_DEFAULT, B2_PIN_DEFAULT, LAT_PIN_DEFAULT, OE_PIN_DEFAULT, A_PIN_DEFAULT, B_PIN_DEFAULT, C_PIN_DEFAULT, D_PIN_DEFAULT, E_PIN_DEFAULT, -1, -1, -1},
+        .gpio_clk=CLK_PIN_DEFAULT,
+        .clkspeed_hz=ESP32_I2S_CLOCK_SPEED, //ESP32_I2S_CLOCK_SPEED,  // formula used is 80000000L/(cfg->clkspeed_hz + 1), must result in >=2.  Acceptable values 26.67MHz, 20MHz, 16MHz, 13.34MHz...
+        .bits=MATRIX_I2S_MODE, //MATRIX_I2S_MODE,
+        .bufa=0,
+        .bufb=0,
+        desccount,
+        desccount,
+        dmadesc_a,
+        dmadesc_b
+    };
+	*/
+	
+	
+	
+    i2s_parallel_config_t cfg={
+        .gpio_bus={r1_pin, g1_pin, b1_pin, r2_pin, g2_pin, b2_pin, lat_pin, oe_pin, a_pin, b_pin, c_pin, d_pin, e_pin, -1, -1, -1},
+        .gpio_clk=clk_pin,
         .clkspeed_hz=ESP32_I2S_CLOCK_SPEED, //ESP32_I2S_CLOCK_SPEED,  // formula used is 80000000L/(cfg->clkspeed_hz + 1), must result in >=2.  Acceptable values 26.67MHz, 20MHz, 16MHz, 13.34MHz...
         .bits=MATRIX_I2S_MODE, //MATRIX_I2S_MODE,
         .bufa=0,
diff --git a/ESP32-RGB64x32MatrixPanel-I2S-DMA.h b/ESP32-RGB64x32MatrixPanel-I2S-DMA.h
index 2e28f8c..070b21c 100644
--- a/ESP32-RGB64x32MatrixPanel-I2S-DMA.h
+++ b/ESP32-RGB64x32MatrixPanel-I2S-DMA.h
@@ -69,23 +69,23 @@
 /***************************************************************************************/
 /* ESP32 Pin Definition. You can change this, but best if you keep it as is...         */
 
-#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 R1_PIN_DEFAULT  25
+#define G1_PIN_DEFAULT  26
+#define B1_PIN_DEFAULT  27
+#define R2_PIN_DEFAULT  14
+#define G2_PIN_DEFAULT  12
+#define B2_PIN_DEFAULT  13
 
-#define A_PIN   23
-#define B_PIN   22
-#define C_PIN   5
-#define D_PIN   17
-#define E_PIN   -1
+#define A_PIN_DEFAULT   23
+#define B_PIN_DEFAULT   22
+#define C_PIN_DEFAULT   5
+#define D_PIN_DEFAULT   17
+#define E_PIN_DEFAULT   -1
+          
+#define LAT_PIN_DEFAULT 4
+#define OE_PIN_DEFAULT  15
 
-#define LAT_PIN 4
-#define OE_PIN  15
-
-#define CLK_PIN 16
+#define CLK_PIN_DEFAULT 16
 
 /***************************************************************************************/
 /* HUB75 RGB Panel definitions and DMA Config. It's best you don't change any of this. */
@@ -175,9 +175,30 @@ class RGB64x32MatrixPanel_I2S_DMA : public Adafruit_GFX {
 		
     }
 	
-    void begin(void)
+	// Painfully propagate the DMA pin configuration, or use compiler defaults
+	void begin(int dma_r1_pin = R1_PIN_DEFAULT , int dma_g1_pin = G1_PIN_DEFAULT, int dma_b1_pin = B1_PIN_DEFAULT , int dma_r2_pin = R2_PIN_DEFAULT , int dma_g2_pin = G2_PIN_DEFAULT , int dma_b2_pin = B2_PIN_DEFAULT , int dma_a_pin  = A_PIN_DEFAULT  , int dma_b_pin = B_PIN_DEFAULT  , int dma_c_pin = C_PIN_DEFAULT , int dma_d_pin = D_PIN_DEFAULT  , int dma_e_pin = E_PIN_DEFAULT , int dma_lat_pin = LAT_PIN_DEFAULT, int dma_oe_pin = OE_PIN_DEFAULT , int dma_clk_pin = CLK_PIN_DEFAULT)
     {
-      configureDMA(); //DMA and I2S configuration and setup
+		
+// Change 'if' to '1' to enable, 0 to not include this Serial output in compiled program		
+#if 1 		
+	  Serial.printf("Using pin %d for the R1_PIN\n", dma_r1_pin);
+	  Serial.printf("Using pin %d for the G1_PIN\n", dma_g1_pin);
+	  Serial.printf("Using pin %d for the B1_PIN\n", dma_b1_pin);
+	  Serial.printf("Using pin %d for the R2_PIN\n", dma_r2_pin);
+	  Serial.printf("Using pin %d for the G2_PIN\n", dma_g2_pin);
+	  Serial.printf("Using pin %d for the B2_PIN\n", dma_b2_pin);
+	  Serial.printf("Using pin %d for the A_PIN\n", dma_a_pin);	  
+	  Serial.printf("Using pin %d for the B_PIN\n", dma_b_pin);	  
+	  Serial.printf("Using pin %d for the C_PIN\n", dma_c_pin);	  
+	  Serial.printf("Using pin %d for the D_PIN\n", dma_d_pin);	  
+	  Serial.printf("Using pin %d for the E_PIN\n", dma_e_pin);	
+  	                 
+	  Serial.printf("Using pin %d for the LAT_PIN\n", dma_lat_pin);	  
+	  Serial.printf("Using pin %d for the OE_PIN\n",  dma_oe_pin);	  
+	  Serial.printf("Using pin %d for the CLK_PIN\n", dma_clk_pin);	
+#endif	  
+		  
+      configureDMA(dma_r1_pin, dma_g1_pin, dma_b1_pin, dma_r2_pin, dma_g2_pin, dma_b2_pin, dma_a_pin,  dma_b_pin, dma_c_pin, dma_d_pin, dma_e_pin, dma_lat_pin,  dma_oe_pin,   dma_clk_pin ); //DMA and I2S configuration and setup
 
       flushDMAbuffer();
 	  swapBuffer();
@@ -237,7 +258,7 @@ class RGB64x32MatrixPanel_I2S_DMA : public Adafruit_GFX {
 			  updateMatrixDMABuffer( x, y, 0, 0, 0);
 	}
 
-    void configureDMA(); // Get everything setup. Refer to the .c file
+    void configureDMA(int r1_pin, int  g1_pin, int  b1_pin, int  r2_pin, int  g2_pin, int  b2_pin, int  a_pin, int   b_pin, int  c_pin, int  d_pin, int  e_pin, int  lat_pin, int   oe_pin, int clk_pin); // Get everything setup. Refer to the .c file
 
     
     // Update a specific pixel in the DMA buffer a colour