Hi, I made some progress and tried today to re-use an LPD8806 library from mbed, as it is ARM based I tried to see if I can get it to work.
Unfortunately it gives me some compiling issues. I'll insert the program and the used 8806.h and 8806.ccp files.
Can someone have a look and let me know how we can get this working ?
The 8806.h file is
// Arduino Due library for LPD8806 led strip, borrowed from MBED.
// Mbed library to control LPD8806-based RGB LED Strips
// (c) 2011 Jelmer Tiete
// This library is ported from the Arduino implementation of Adafruit Industries
// found at: http://github.com/adafruit/LPD8806
// and their strips: http://www.adafruit.com/products/306
// Released under the MIT License: http://mbed.org/license/mit
//
// standard connected to 1st hardware SPI
// LPD8806 <> MBED
// DATA -> P5
// CLOCK -> p7
/*****************************************************************************/
#if (ARDUINO >= 100)
#include <Arduino.h>
#else
#include <WProgram.h>
#endif
#define HARDWARE_SPI 1
#ifndef LPD8806_H
#define LPD8806_H
class LPD8806 {
public:
LPD8806(uint16_t n);
void
begin(void),
show(void),
setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b),
setPixelColor(uint16_t n, uint32_t c);
uint16_t
numPixels(void);
uint32_t
Color(uint8_t, uint8_t, uint8_t);
private:
uint8_t
*pixels; // Holds LED color values
uint16_t
numLEDs; // Number of RGB LEDs in strand
void
writezeros(uint16_t n);
};
#endif
The 8806.ccp file is the following
//Library for Arduino Due LPD8806
//taken from MBEd as it is ARM based
//
//
//Mbed library to control LPD8806-based RGB LED Strips
// (c) 2011 Jelmer Tiete
// This library is ported from the Arduino implementation of Adafruit Industries
// found at: http://github.com/adafruit/LPD8806
// and their strips: http://www.adafruit.com/products/306
// Released under the MIT License: http://mbed.org/license/mit
//
/*****************************************************************************/
#include "LPD8806.h"
#include <SPI.h>
//here something goes wrong
SPIClass SPI = SPIClass( SPI_MODE0 );
SPI.begin();
//SPI spi(p11, p12, p13); // mosi, miso, sclk
LPD8806::LPD8806(uint16_t n) {
// Allocate 3 bytes per pixel:
if (NULL != (pixels = (uint8_t *)malloc(numLEDs * 3))) {
memset(pixels, 0x80, numLEDs * 3); // Init to RGB 'off' state
numLEDs = n;
}
}
void LPD8806::begin(void) {
// Setup the spi for 8 bit data, low steady state clock,
// first edge capture, with a 2MHz clock rate
//spi.format(8,0);
//spi.frequency(2000000);
SPI.setClockDivider(21);
// Issue initial latch to 'wake up' strip (latch length varies w/numLEDs)
writezeros(3 * ((numLEDs + 63) / 64));
}
uint16_t LPD8806::numPixels(void) {
return numLEDs;
}
void LPD8806::writezeros(uint16_t n) {
while (n--) SPI.transfer(0x00);
}
// This is how data is pushed to the strip. Unfortunately, the company
// that makes the chip didnt release the protocol document or you need
// to sign an NDA or something stupid like that, but we reverse engineered
// this from a strip controller and it seems to work very nicely!
void LPD8806::show(void) {
uint16_t i, nl3 = numLEDs * 3; // 3 bytes per LED
for (i=0; i<nl3; i++ ) {
SPI.transfer(pixels[i]);
}
// Write latch at end of data; latch length varies with number of LEDs
writezeros(3 * ((numLEDs + 63) / 64));
// We need to have a delay here, a few ms seems to do the job
// shorter may be OK as well - need to experiment :(
// wait_ms(3);
}
// Convert R,G,B to combined 32-bit color
uint32_t LPD8806::Color(uint8_t r, uint8_t g, uint8_t b) {
// Take the lowest 7 bits of each value and append them end to end
// We have the top bit set high (its a 'parity-like' bit in the protocol
// and must be set!)
return 0x808080 | ((uint32_t)g << 16) | ((uint32_t)r << 8) | (uint32_t)b;
}
// store the rgb component in our array
void LPD8806::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b) {
if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
pixels[n*3 ] = g | 0x80;
pixels[n*3+1] = r | 0x80;
pixels[n*3+2] = b | 0x80;
}
void LPD8806::setPixelColor(uint16_t n, uint32_t c) {
if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
pixels[n*3 ] = (c >> 16) | 0x80;
pixels[n*3+1] = (c >> 8) | 0x80;
pixels[n*3+2] = c | 0x80;
}
The error I get when compiling is the following:
C:\Users\Rudy\Program Files\arduino-1.5\libraries\LPD8806\LPD8806.cpp:19: error: no matching function for call to 'SPIClass::SPIClass(int)'
C:\Users\Rudy\Program Files\arduino-1.5\hardware\arduino\sam\libraries\SPI/SPI.h:29: note: candidates are: SPIClass::SPIClass(Spi*, uint32_t, void (*)())
C:\Users\Rudy\Program Files\arduino-1.5\hardware\arduino\sam\libraries\SPI/SPI.h:27: note: SPIClass::SPIClass(const SPIClass&)
C:\Users\Rudy\Program Files\arduino-1.5\libraries\LPD8806\LPD8806.cpp:21: error: expected constructor, destructor, or type conversion before '.' token
Who can help me out ?
KR,
Rudy
