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106 lines
2.5 KiB
C++
106 lines
2.5 KiB
C++
/*
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* Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* This program and the accompanying materials are made available under the
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* terms of the The MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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*/
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#include <iostream>
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#include <unistd.h>
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#include <stdlib.h>
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#include <cstring>
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#include <stdexcept>
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#include "lpd8806.hpp"
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using namespace upm;
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LPD8806::LPD8806 (int bus, int csn, uint16_t pixelCount) :m_spi(bus), m_csnPinCtx(csn) {
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mraa::Result error = mraa::SUCCESS;
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m_name = "LPD8806";
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m_pixels = NULL;
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error = m_csnPinCtx.dir (mraa::DIR_OUT);
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if (error != mraa::SUCCESS) {
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throw std::invalid_argument(std::string(__FUNCTION__) +
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": GPIO failed to set direction");
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}
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CSOff ();
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// set spi mode to mode2 (CPOL = 0, CPHA = 0)
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m_spi.mode (mraa::SPI_MODE0);
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CSOn ();
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// issue initial latch/reset to strip:
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for (uint16_t i = ((pixelCount + 31) / 32); i > 0; i--) {
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m_spi.writeByte (0);
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}
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CSOff ();
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m_pixelsCount = pixelCount;
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uint8_t latchBytes;
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uint16_t dataBytes, totalBytes;
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dataBytes = m_pixelsCount * 3;
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latchBytes = (m_pixelsCount + 31) / 32;
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totalBytes = dataBytes + latchBytes;
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if ((m_pixels = (uint8_t *) malloc(totalBytes))) {
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memset ( m_pixels , 0x80, dataBytes); // Init to RGB 'off' state
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memset (&m_pixels[dataBytes], 0 , latchBytes); // Clear latch bytes
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}
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}
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LPD8806::~LPD8806() {
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if (m_pixels) {
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free(m_pixels);
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}
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}
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void
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LPD8806::setPixelColor (uint16_t pixelOffset, uint8_t r, uint8_t g, uint8_t b) {
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if (pixelOffset < m_pixelsCount) { // Arrays are 0-indexed, thus NOT '<='
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uint8_t *ptr = &m_pixels[pixelOffset * 3];
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*ptr++ = g | 0x80; // Strip color order is GRB,
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*ptr++ = r | 0x80; // not the more common RGB,
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*ptr++ = b | 0x80; // so the order here is intentional; don't "fix"
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}
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}
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void
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LPD8806::show (void) {
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uint8_t *ptr = m_pixels;
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uint16_t byte = (m_pixelsCount * 3) + ((m_pixelsCount + 31) / 32);
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while (byte--) {
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m_spi.writeByte (*ptr++);
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}
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}
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uint16_t
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LPD8806::getStripLength (void) {
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return m_pixelsCount;
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}
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/*
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* **************
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* private area
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* **************
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*/
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mraa::Result
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LPD8806::CSOn () {
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return m_csnPinCtx.write (HIGH);
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}
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mraa::Result
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LPD8806::CSOff () {
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return m_csnPinCtx.write (LOW);
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}
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