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/*
* Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <iostream>
#include <unistd.h>
#include <stdlib.h>
#include <cstring>
#include <stdexcept>
#include "lpd8806.h"
using namespace upm;
LPD8806::LPD8806 (uint16_t pixelCount, uint8_t csn) : m_csnPinCtx(csn), m_spi(0) {
mraa::Result error = mraa::SUCCESS;
m_name = "LPD8806";
m_pixels = NULL;
error = m_csnPinCtx.dir (mraa::DIR_OUT);
if (error != mraa::SUCCESS) {
throw std::invalid_argument(std::string(__FUNCTION__) +
": GPIO failed to set direction");
}
CSOff ();
// set spi mode to mode2 (CPOL = 0, CPHA = 0)
m_spi.mode (mraa::SPI_MODE0);
CSOn ();
// issue initial latch/reset to strip:
for (uint16_t i = ((pixelCount + 31) / 32); i > 0; i--) {
m_spi.writeByte (0);
}
CSOff ();
m_pixelsCount = pixelCount;
uint8_t latchBytes;
uint16_t dataBytes, totalBytes;
uint16_t numBytes = 0;
dataBytes = m_pixelsCount * 3;
latchBytes = (m_pixelsCount + 31) / 32;
totalBytes = dataBytes + latchBytes;
if ((m_pixels = (uint8_t *) malloc(totalBytes))) {
numBytes = totalBytes;
memset ( m_pixels , 0x80, dataBytes); // Init to RGB 'off' state
memset (&m_pixels[dataBytes], 0 , latchBytes); // Clear latch bytes
}
}
LPD8806::~LPD8806() {
if (m_pixels) {
free(m_pixels);
}
}
void
LPD8806::setPixelColor (uint16_t pixelOffset, uint8_t r, uint8_t g, uint8_t b) {
if (pixelOffset < m_pixelsCount) { // Arrays are 0-indexed, thus NOT '<='
uint8_t *ptr = &m_pixels[pixelOffset * 3];
*ptr++ = g | 0x80; // Strip color order is GRB,
*ptr++ = r | 0x80; // not the more common RGB,
*ptr++ = b | 0x80; // so the order here is intentional; don't "fix"
}
}
void
LPD8806::show (void) {
uint8_t *ptr = m_pixels;
uint16_t byte = (m_pixelsCount * 3) + ((m_pixelsCount + 31) / 32);
while (byte--) {
m_spi.writeByte (*ptr++);
}
}
uint16_t
LPD8806::getStripLength (void) {
return m_pixelsCount;
}
/*
* **************
* private area
* **************
*/
mraa::Result
LPD8806::CSOn () {
return m_csnPinCtx.write (HIGH);
}
mraa::Result
LPD8806::CSOff () {
return m_csnPinCtx.write (LOW);
}
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