Hi,
I am trying to get a string of 25 WS2801 LED “Bullets” from adafruit to work with my electron.
I am using the library from the IDE – WS2801 (1.0.0)
I have the pins wired as follows:
A5 (MOSI) Yellow wire on Adafruit Pixels
A3 (SCK) Green wire on Adafruit Pixels
I am using a 5v, 10A supply and have the grounds all wired together.
The first 7 LED’s light up in different colors, but that is all.
I am using the example that was pointed to by the library, but I tried specifying the A5 pin and A3 pin specifically after I couldn’t get things to work without that:
/* ========================== Application.cpp =========================== */
#include "application.h"
#include "WS2801.h"
/*****************************************************************************
Example sketch for driving Adafruit WS2801 pixels on the Spark Core!
Designed specifically to work with the Adafruit RGB Pixels!
12mm Bullet shape ----> https://www.adafruit.com/products/322
12mm Flat shape ----> https://www.adafruit.com/products/738
36mm Square shape ----> https://www.adafruit.com/products/683
These pixels use SPI to transmit the color data, and have built in
high speed PWM drivers for 24 bit color per pixel
2 pins are required to interface
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, all text above must be included in any redistribution
*****************************************************************************/
// The colors of the wires may be totally different so
// BE SURE TO CHECK YOUR PIXELS TO SEE WHICH WIRES TO USE!
// SPARK CORE SPI PINOUTS
// http://docs.spark.io/#/firmware/communication-spi
// A5 (MOSI) Yellow wire on Adafruit Pixels
// A3 (SCK) Green wire on Adafruit Pixels
// Don't forget to connect the ground wire to Arduino ground,
// and the +5V wire to a +5V supply$
const int numPixel = 25;
#define dpin A5
#define cpin A3
// Set the argument to the NUMBER of pixels.
Adafruit_WS2801 strip = Adafruit_WS2801(numPixel, dpin, cpin);
// For 36mm LED pixels: these pixels internally represent color in a
// different format. Either of the above constructors can accept an
// optional extra parameter: WS2801_RGB is 'conventional' RGB order
// WS2801_GRB is the GRB order required by the 36mm pixels. Other
// than this parameter, your code does not need to do anything different;
// the library will handle the format change. Example:
//Adafruit_WS2801 strip = Adafruit_WS2801(25, WS2801_GRB);
void setup() {
strip.begin();
delay(5000);
}
void loop() {
Spark.function("color", color);
strip.begin();
}
int color(String command) {
// format is [RRR,GGG,BBB]
// ie 1st red is [255,000,000]
int red = command.substring(1,4).toInt();
int green = command.substring(5,8).toInt();
int blue = command.substring(9,12).toInt();
int i;
for (i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, red, green, blue);
strip.show();
delay(50);
}
}
and here is the library:
//-----------------------------------------------//
// SPARK CORE Adafruit_WS2801 LIBRARY & EXAMPLE //
//===============================================//
// Copy this into a new application at: //
// https://www.spark.io/build and go nuts! //
// Read comments in APPLICATION.CPP section for //
// Hookup details! //
//-----------------------------------------------//
// Technobly / BDub - Jan 9th, 2014 //
//===============================================//
/*****************************************************************************
Example sketch for driving Adafruit WS2801 pixels on the Spark Core!
Designed specifically to work with the Adafruit RGB Pixels!
12mm Bullet shape ----> https://www.adafruit.com/products/322
12mm Flat shape ----> https://www.adafruit.com/products/738
36mm Square shape ----> https://www.adafruit.com/products/683
These pixels use SPI to transmit the color data, and have built in
high speed PWM drivers for 24 bit color per pixel
2 pins are required to interface
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, all text above must be included in any redistribution
*****************************************************************************/
/* ========================== Adafruit_WS2801.cpp =========================== */
#include "WS2801.h"
// Example to control WS2801-based RGB LED Modules in a strand or strip
// Written by Adafruit - MIT license
/*****************************************************************************/
// Constructor for use with hardware SPI (specific clock/data pins):
Adafruit_WS2801::Adafruit_WS2801(uint16_t n, uint8_t order) {
rgb_order = order;
alloc(n);
updatePins();
}
// Constructor for use with arbitrary clock/data pins:
Adafruit_WS2801::Adafruit_WS2801(uint16_t n, uint8_t dpin, uint8_t cpin, uint8_t order) {
rgb_order = order;
alloc(n);
updatePins(dpin, cpin);
}
// Constructor for use with a matrix configuration, specify w, h for size of matrix
// assumes configuration where string starts at coordinate 0,0 and continues to w-1,0, w-1,1
// and on to 0,1, 0,2 and on to w-1,2 and so on. Snaking back and forth till the end.
// other function calls with provide access to pixels via an x,y coordinate system
Adafruit_WS2801::Adafruit_WS2801(uint16_t w, uint16_t h, uint8_t dpin, uint8_t cpin, uint8_t order) {
rgb_order = order;
updatePins(dpin, cpin);
}
// Allocate 3 bytes per pixel, init to RGB 'off' state:
void Adafruit_WS2801::alloc(uint16_t n) {
begun = false;
numLEDs = ((pixels = (uint8_t *)calloc(n, 3)) != NULL) ? n : 0;
}
// via Michael Vogt/neophob: empty constructor is used when strand length
// isn't known at compile-time; situations where program config might be
// read from internal flash memory or an SD card, or arrive via serial
// command. If using this constructor, MUST follow up with updateLength()
// and updatePins() to establish the strand length and output pins!
// Also, updateOrder() to change RGB vs GRB order (RGB is default).
Adafruit_WS2801::Adafruit_WS2801(void) {
begun = false;
numLEDs = 0;
pixels = NULL;
rgb_order = WS2801_RGB;
updatePins(); // Must assume hardware SPI until pins are set
}
// Release memory (as needed):
Adafruit_WS2801::~Adafruit_WS2801(void) {
if (pixels != NULL) {
free(pixels);
}
}
// Activate hard/soft SPI as appropriate:
void Adafruit_WS2801::begin(void) {
if(hardwareSPI == true) {
startSPI();
} else {
pinMode(datapin, OUTPUT);
pinMode(clkpin , OUTPUT);
}
begun = true;
}
// Change pin assignments post-constructor, switching to hardware SPI:
void Adafruit_WS2801::updatePins(void) {
hardwareSPI = true;
datapin = clkpin = 0;
// If begin() was previously invoked, init the SPI hardware now:
if(begun == true) startSPI();
// Otherwise, SPI is NOT initted until begin() is explicitly called.
// Note: any prior clock/data pin directions are left as-is and are
// NOT restored as inputs!
}
// Change pin assignments post-constructor, using arbitrary pins:
void Adafruit_WS2801::updatePins(uint8_t dpin, uint8_t cpin) {
if(begun == true) { // If begin() was previously invoked...
// If previously using hardware SPI, turn that off:
if(hardwareSPI == true) SPI.end();
// Regardless, now enable output on 'soft' SPI pins:
pinMode(dpin, OUTPUT);
pinMode(cpin, OUTPUT);
} // Otherwise, pins are not set to outputs until begin() is called.
// Note: any prior clock/data pin directions are left as-is and are
// NOT restored as inputs!
hardwareSPI = false;
datapin = dpin;
clkpin = cpin;
////clkport = portOutputRegister(digitalPinToPort(cpin));
////clkpinmask = digitalPinToBitMask(cpin);
////dataport = portOutputRegister(digitalPinToPort(dpin));
////datapinmask = digitalPinToBitMask(dpin);
}
// Enable SPI hardware and set up protocol details:
void Adafruit_WS2801::startSPI(void) {
SPI.begin();
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE0);
SPI.setClockDivider(SPI_CLOCK_DIV64); // 1 MHz max, else flicker (set to 72MHz/128 = 562.5kHz)
}
uint16_t Adafruit_WS2801::numPixels(void) {
return numLEDs;
}
// Change strand length (see notes with empty constructor, above):
void Adafruit_WS2801::updateLength(uint16_t n) {
if(pixels != NULL) free(pixels); // Free existing data (if any)
// Allocate new data -- note: ALL PIXELS ARE CLEARED
numLEDs = ((pixels = (uint8_t *)calloc(n, 3)) != NULL) ? n : 0;
// 'begun' state does not change -- pins retain prior modes
}
// Change RGB data order (see notes with empty constructor, above):
void Adafruit_WS2801::updateOrder(uint8_t order) {
rgb_order = order;
// Existing LED data, if any, is NOT reformatted to new data order.
// Calling function should clear or fill pixel data anew.
}
void Adafruit_WS2801::show(void) {
uint16_t i, nl3 = numLEDs * 3; // 3 bytes per LED
for(i=0; i<nl3; i++) {
SPI.transfer(pixels[i]);
}
delay(1); // Data is latched by holding clock pin low for 1 millisecond
}
// Set pixel color from separate 8-bit R, G, B components:
void Adafruit_WS2801::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b) {
if(n < numLEDs) { // Arrays are 0-indexed, thus NOT '<='
uint8_t *p = &pixels[n * 3];
// See notes later regarding color order
if(rgb_order == WS2801_RGB) {
*p++ = r;
*p++ = g;
} else {
*p++ = g;
*p++ = r;
}
*p++ = b;
}
}
// Set pixel color from 'packed' 32-bit RGB value:
void Adafruit_WS2801::setPixelColor(uint16_t n, uint32_t c) {
if(n < numLEDs) { // Arrays are 0-indexed, thus NOT '<='
uint8_t *p = &pixels[n * 3];
// To keep the show() loop as simple & fast as possible, the
// internal color representation is native to different pixel
// types. For compatibility with existing code, 'packed' RGB
// values passed in or out are always 0xRRGGBB order.
if(rgb_order == WS2801_RGB) {
*p++ = c >> 16; // Red
*p++ = c >> 8; // Green
} else {
*p++ = c >> 8; // Green
*p++ = c >> 16; // Red
}
*p++ = c; // Blue
}
}
// Query color from previously-set pixel (returns packed 32-bit RGB value)
uint32_t Adafruit_WS2801::getPixelColor(uint16_t n) {
if(n < numLEDs) {
uint16_t ofs = n * 3;
// To keep the show() loop as simple & fast as possible, the
// internal color representation is native to different pixel
// types. For compatibility with existing code, 'packed' RGB
// values passed in or out are always 0xRRGGBB order.
return (rgb_order == WS2801_RGB) ?
((uint32_t)pixels[ofs] << 16) | ((uint16_t) pixels[ofs + 1] << 8) | pixels[ofs + 2] :
(pixels[ofs] << 8) | ((uint32_t)pixels[ofs + 1] << 16) | pixels[ofs + 2];
}
return 0; // Pixel # is out of bounds
}