Esp32 (#167)

* Organize Examples

* Esp32 Support

refactored Esp8266 to more generic Esp

examples/bitmaps/NeoPixelBitmap/NeoPixelBitmap.ino

@@ -0,0 +1,98 @@
+// NeoPixelBuffer
+// This example will animate pixels using a bitmap stored on a SD card
+// 
+//
+// This will demonstrate the use of the NeoBitmapFile object 
+// NOTE:  The images provided in the example directory should be copied to
+// the root of the SD card so the below code will find it.
+// NOTE:  This sample and the included images were built for a 144 pixel strip so
+// running this with a smaller string may not look as interesting.  Try providing
+// your own 24 bit bitmap for better results.
+
+#include <NeoPixelBus.h>
+#include <NeoPixelAnimator.h>
+#include <SPI.h> 
+#include <SD.h> 
+
+const int chipSelect = D8; // make sure to set this to your SD carder reader CS
+
+//typedef NeoGrbFeature MyPixelColorFeature;
+typedef NeoGrbwFeature MyPixelColorFeature;
+
+const uint16_t PixelCount = 144; // the sample images are meant for 144 pixels
+const uint16_t PixelPin = 2;
+const uint16_t AnimCount = 1; // we only need one
+
+NeoPixelBus<MyPixelColorFeature, Neo800KbpsMethod> strip(PixelCount, PixelPin);
+// for esp8266 omit the pin
+//NeoPixelBus<MyPixelColorFeature, Neo800KbpsMethod> strip(PixelCount);
+NeoPixelAnimator animations(AnimCount); // NeoPixel animation management object
+
+// our NeoBitmapFile will use the same color feature as NeoPixelBus and
+// we want it to use the SD File object 
+NeoBitmapFile<MyPixelColorFeature, File> image;
+
+uint16_t animState;
+
+void LoopAnimUpdate(const AnimationParam& param)
+{
+    // wait for this animation to complete,
+    // we are using it as a timer of sorts
+    if (param.state == AnimationState_Completed)
+    {
+        // done, time to restart this position tracking animation/timer
+        animations.RestartAnimation(param.index);
+
+        // draw the complete row at animState to the complete strip
+        image.Blt(strip, 0, 0, animState, image.Width());
+        animState = (animState + 1) % image.Height(); // increment and wrap
+    }
+}
+
+void setup() {
+    Serial.begin(115200);
+    while (!Serial); // wait for serial attach
+
+    strip.Begin();
+    strip.Show();
+
+    Serial.print("Initializing SD card...");
+
+    // see if the card is present and can be initialized:
+    if (!SD.begin(chipSelect))
+    {
+        Serial.println("Card failed, or not present");
+        // don't do anything more:
+        return;
+    }
+    Serial.println("card initialized.");
+
+    // open the file
+    File bitmapFile = SD.open("strings.bmp"); 
+    if (!bitmapFile)
+    {
+        Serial.println("File open fail, or not present");
+        // don't do anything more:
+        return;
+    }
+
+    // initialize the image with the file
+    if (!image.Begin(bitmapFile))
+    {
+        Serial.println("File format fail, not a supported bitmap");
+        // don't do anything more:
+        return;
+    }
+
+    animState = 0;
+    // we use the index 0 animation to time how often we rotate all the pixels
+    animations.StartAnimation(0, 30, LoopAnimUpdate);
+}
+
+void loop() {
+    // this is all that is needed to keep it running
+    // and avoiding using delay() is always a good thing for
+    // any timing related routines
+    animations.UpdateAnimations();
+    strip.Show();
+}