ece4180final / NeoStrip

Library for controlling a strip of Adafruit NeoPixels with WS2812 drivers. Because of the strict timing requirements of the self-clocking data signal, the critical parts of code are written in ARM assembly. Currently, only the NXP LPC1768 platform is supported. More information about NeoPixels can be found at http://learn.adafruit.com/adafruit-neopixel-uberguide/overview

Dependents:   Merged_Demo

Fork of NeoStrip by Allen Wild

NeoStrip.h@1:2afb4da99560, 2014-04-25 (annotated)

Committer:
zchen311
Date:
Fri Apr 25 14:31:36 2014 +0000
Revision:
1:2afb4da99560
Parent:
0:9f237b11f0a8 
initl

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aswild 0:9f237b11f0a8 1 /**
aswild 0:9f237b11f0a8 2 * NeoStrip.h
aswild 0:9f237b11f0a8 3 *
aswild 0:9f237b11f0a8 4 * Allen Wild
aswild 0:9f237b11f0a8 5 * March 2014
aswild 0:9f237b11f0a8 6 *
aswild 0:9f237b11f0a8 7 * Library for the control of Adafruit NeoPixel addressable RGB LEDs.
aswild 0:9f237b11f0a8 8 */
aswild 0:9f237b11f0a8 9
aswild 0:9f237b11f0a8 10
aswild 0:9f237b11f0a8 11 #ifndef NEOSTRIP_H
aswild 0:9f237b11f0a8 12 #define NEOSTRIP_H
aswild 0:9f237b11f0a8 13
aswild 0:9f237b11f0a8 14 #ifndef TARGET_LPC1768
aswild 0:9f237b11f0a8 15 #error NeoStrip only supports the NXP LPC1768!
aswild 0:9f237b11f0a8 16 #endif
aswild 0:9f237b11f0a8 17
aswild 0:9f237b11f0a8 18 // NeoColor struct definition to hold 24 bit
aswild 0:9f237b11f0a8 19 // color data for each pixel, in GRB order
aswild 0:9f237b11f0a8 20 typedef struct _NeoColor
aswild 0:9f237b11f0a8 21 {
aswild 0:9f237b11f0a8 22 uint8_t green;
aswild 0:9f237b11f0a8 23 uint8_t red;
aswild 0:9f237b11f0a8 24 uint8_t blue;
aswild 0:9f237b11f0a8 25 } NeoColor;
aswild 0:9f237b11f0a8 26
aswild 0:9f237b11f0a8 27 /**
aswild 0:9f237b11f0a8 28 * NeoStrip objects manage the buffering and assigning of
aswild 0:9f237b11f0a8 29 * addressable NeoPixels
aswild 0:9f237b11f0a8 30 */
aswild 0:9f237b11f0a8 31 class NeoStrip
aswild 0:9f237b11f0a8 32 {
aswild 0:9f237b11f0a8 33 public:
aswild 0:9f237b11f0a8 34
aswild 0:9f237b11f0a8 35 /**
aswild 0:9f237b11f0a8 36 * Create a NeoStrip object
aswild 0:9f237b11f0a8 37 *
aswild 0:9f237b11f0a8 38 * @param pin The mbed data pin name
aswild 0:9f237b11f0a8 39 * @param N The number of pixels in the strip
aswild 0:9f237b11f0a8 40 */
aswild 0:9f237b11f0a8 41 NeoStrip(PinName pin, int N);
aswild 0:9f237b11f0a8 42
aswild 0:9f237b11f0a8 43 /**
aswild 0:9f237b11f0a8 44 * Set an overall brightness scale for the entire strip.
aswild 0:9f237b11f0a8 45 * When colors are set using setPixel(), they are scaled
aswild 0:9f237b11f0a8 46 * according to this brightness.
aswild 0:9f237b11f0a8 47 *
aswild 0:9f237b11f0a8 48 * Because NeoPixels are very bright and draw a lot of current,
aswild 0:9f237b11f0a8 49 * the brightness is set to 0.5 by default.
aswild 0:9f237b11f0a8 50 *
aswild 0:9f237b11f0a8 51 * @param bright The brightness scale between 0 and 1.0
aswild 0:9f237b11f0a8 52 */
aswild 0:9f237b11f0a8 53 void setBrightness(float bright);
aswild 0:9f237b11f0a8 54
aswild 0:9f237b11f0a8 55 /**
aswild 0:9f237b11f0a8 56 * Set a single pixel to the specified color.
aswild 0:9f237b11f0a8 57 *
aswild 0:9f237b11f0a8 58 * This method (and all other setPixel methods) uses modulo-N arithmetic
aswild 0:9f237b11f0a8 59 * when addressing pixels. If p >= N, the pixel address will wrap around.
aswild 0:9f237b11f0a8 60 *
aswild 0:9f237b11f0a8 61 * @param p The pixel number (starting at 0) to set
aswild 0:9f237b11f0a8 62 * @param color A 24-bit color packed into a single int,
aswild 0:9f237b11f0a8 63 * using standard hex color codes (e.g. 0xFF0000 is red)
aswild 0:9f237b11f0a8 64 */
aswild 0:9f237b11f0a8 65 void setPixel(int p, int color);
aswild 0:9f237b11f0a8 66
aswild 0:9f237b11f0a8 67 /**
aswild 0:9f237b11f0a8 68 * Set a single pixel to the specified color, with red, green, and blue
aswild 0:9f237b11f0a8 69 * values in separate arguments.
aswild 0:9f237b11f0a8 70 */
aswild 0:9f237b11f0a8 71 void setPixel(int p, uint8_t red, uint8_t green, uint8_t blue);
aswild 0:9f237b11f0a8 72
aswild 0:9f237b11f0a8 73 /**
aswild 0:9f237b11f0a8 74 * Set n pixels starting at pixel p.
aswild 0:9f237b11f0a8 75 *
aswild 0:9f237b11f0a8 76 * @param p The first pixel in the strip to set.
aswild 0:9f237b11f0a8 77 * @param n The number of pixels to set.
aswild 0:9f237b11f0a8 78 * @param colors An array of length n containing the 24-bit colors for each pixel
aswild 0:9f237b11f0a8 79 */
aswild 0:9f237b11f0a8 80 void setPixels(int p, int n, const int *colors);
aswild 0:9f237b11f0a8 81
aswild 0:9f237b11f0a8 82 /**
aswild 0:9f237b11f0a8 83 * Reset all pixels in the strip to be of (0x000000)
aswild 0:9f237b11f0a8 84 */
aswild 0:9f237b11f0a8 85 void clear();
aswild 0:9f237b11f0a8 86
aswild 0:9f237b11f0a8 87 /**
aswild 0:9f237b11f0a8 88 * Write the colors out to the strip; this method must be called
aswild 0:9f237b11f0a8 89 * to see any hardware effect.
aswild 0:9f237b11f0a8 90 *
aswild 0:9f237b11f0a8 91 * This function disables interrupts while the strip data is being sent,
aswild 0:9f237b11f0a8 92 * each pixel takes approximately 30us to send, plus a 50us reset pulse
aswild 0:9f237b11f0a8 93 * at the end.
aswild 0:9f237b11f0a8 94 */
aswild 0:9f237b11f0a8 95 void write();
aswild 0:9f237b11f0a8 96
aswild 0:9f237b11f0a8 97 protected:
aswild 0:9f237b11f0a8 98 NeoColor *strip; // pixel data buffer modified by setPixel() and used by neo_out()
aswild 0:9f237b11f0a8 99 int N; // the number of pixels in the strip
aswild 0:9f237b11f0a8 100 int Nbytes; // the number of bytes of pixel data (always N*3)
aswild 0:9f237b11f0a8 101 float bright; // the master strip brightness
aswild 0:9f237b11f0a8 102 gpio_t gpio; // gpio struct for initialization and getting register addresses
aswild 0:9f237b11f0a8 103 };
aswild 0:9f237b11f0a8 104
aswild 0:9f237b11f0a8 105 #endif
aswild 0:9f237b11f0a8 106
aswild 0:9f237b11f0a8 107