mirror of
https://github.com/eclipse/upm.git
synced 2025-03-19 23:17:29 +03:00
119 lines
3.3 KiB
C++
119 lines
3.3 KiB
C++
/*
|
|
* 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.hpp"
|
|
|
|
using namespace upm;
|
|
|
|
LPD8806::LPD8806 (uint16_t pixelCount, int csn) :m_spi(0), m_csnPinCtx(csn) {
|
|
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;
|
|
|
|
dataBytes = m_pixelsCount * 3;
|
|
latchBytes = (m_pixelsCount + 31) / 32;
|
|
totalBytes = dataBytes + latchBytes;
|
|
if ((m_pixels = (uint8_t *) malloc(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);
|
|
}
|