Diff: neopixel-spi.cpp

Revision:

2:3c3c41774cdf

Parent:

1:adbbe3e9f2c5

Child:

3:6f392fcb1d3b

--- a/neopixel-spi.cpp	Fri Jul 25 15:18:03 2014 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,61 +0,0 @@
-#include <stdint.h>
-#include "mbed.h"
-#include "neopixel-spi.h"
-
-namespace neopixel {
-
-Array::Array(PinName out) : spi_(out, NC, NC) {
-  // TODO: WS2811 has a different timing specification.
-  
-  // WS2812 bit timings:
-  //  '0': ----________    mark: 0.40us, space: 0.85us
-  //  '1': --------____    mark: 0.80us, space: 0.45us
-  // The period is 1.25us, giving a basic frequency of 800kHz.
-  // Using three SPI bits per NeoPixel bit, we need an API frequency of 2.4MHz.
-  //  '0': 100             mark: 0.42us, space: 0.83us
-  //  '1': 110             mark: 0.83us, space: 0.42us
-  // These timings are well within the +/-150ns tolerance specified by WS2812.
-  
-  spi_.frequency(2400000);
-  spi_.format(12);          // Send four NeoPixel bits in each packet.
-}
-
-static void SendFourBits(BurstSPI& spi, uint32_t bits) {
-  static int const pattern_width = 3;
-  uint32_t word = 04444;  // 0b100100100100
-  
-  for (int i = 0; i < 4; i++) {
-    word |= ((bits >> 3) & 1) << (pattern_width * i + 1);
-  }
-  
-  spi.fastWrite(word);
-}
-
-void Array::Update(Pixel buffer[], size_t length) {
-  // Pixels are sent as follows:
-  // - The first transmitted pixel is the pixel closest to the transmitter.
-  // - The most significant bit is always sent first.
-  // - Green is sent first, then red, then blue.
-  //
-  // g7,g6,g5,g4,g3,g2,g1,g0,r7,r6,r5,r4,r3,r2,r1,r0,b7,b6,b5,b4,b3,b2,b1,b0
-  // \_____________________________________________________________________/
-  //                           |      _________________...
-  //                           |     /   __________________...
-  //                           |    /   /   ___________________...
-  //                           |   /   /   /
-  //                          GRB,GRB,GRB,GRB,...
-  
-  for (size_t i = 0; i < length; i++) {
-    SendFourBits(spi_, (buffer[i].green >> 4) & 0xf);
-    SendFourBits(spi_, (buffer[i].green >> 0) & 0xf);
-    SendFourBits(spi_, (buffer[i].red >> 4) & 0xf);
-    SendFourBits(spi_, (buffer[i].red >> 0) & 0xf);
-    SendFourBits(spi_, (buffer[i].blue >> 4) & 0xf);
-    SendFourBits(spi_, (buffer[i].blue >> 0) & 0xf);
-  }
-  spi_.clearRX();
-  
-  wait_us(50);
-}
-
-}
\ No newline at end of file