WS2811.h

00001 // Mbed library to control WS2801-based RGB LED Strips
00002 // some portions (c) 2011 Jelmer Tiete
00003 // This library is ported from the Arduino implementation of Adafruit Industries
00004 // found at: http://github.com/adafruit/LPD8806
00005 // and their strips: http://www.adafruit.com/products/306
00006 // Released under the MIT License: http://mbed.org/license/mit
00007 //
00008 /*****************************************************************************/
00009 
00010 // Heavily modified by Jas Strong, 2012-10-04
00011 // Changed to use a virtual base class and to use software SPI.
00012 //
00013 // Modified by Ned Konz, December 2013.
00014 // Using three-phase DMA ala Paul Stoffegren's version.
00015 
00016 #ifndef MBED_WS2811_H
00017 #define MBED_WS2811_H
00018 
00019 #include "mbed.h"
00020 #include "LedStrip.h"
00021 
00022 #define MAX_LEDS_PER_STRIP 64
00023 
00024 extern "C" void DMA0_IRQHandler();
00025 extern "C" void TPM0_IRQHandler();
00026 
00027 class WS2811 : public LedStrip
00028 {
00029 public:
00030     WS2811(unsigned n, unsigned pinNumber);
00031 
00032     virtual void begin();
00033     virtual void show();
00034     virtual void blank();
00035 
00036     static void startDMA();
00037 
00038 private:
00039     uint32_t pinMask;
00040 
00041     void writePixel(unsigned n, uint8_t *p);
00042 
00043     // Class Static:
00044 
00045     static bool initialized;
00046     static uint32_t enabledPins;
00047     static volatile bool dma_done;
00048     static void wait_for_dma_done() { while (!dma_done) __WFI(); }
00049 
00050     static void writeByte(uint8_t byte, uint32_t mask, uint32_t *dest);
00051 
00052     static void hw_init();
00053         static void io_init();
00054         static void clock_init();
00055         static void dma_init();
00056         static void tpm_init();
00057         static void dma_data_init();
00058         
00059     friend void TPM0_IRQHandler();
00060 };
00061 
00062 #endif
00063