p9813: Chainable LEDS

Initial commit of the p9813 chainable LED controller.
Added C, C++, python, java, and node examples.

Signed-off-by: Sergey Kiselev <sergey.kiselev@intel.com>
Signed-off-by: Noel Eck <noel.eck@intel.com>

src/p9813/p9813.cxx

@@ -0,0 +1,146 @@
+/*
+ * Author: Sergey Kiselev <sergey.kiselev@intel.com>
+ * Copyright (c) 2017 Sergey Kiselev
+ * Based on the apa102 driver writen by Yannick Adam <yannick.adam@gmail.com>
+ *
+ * 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 <cstring>
+#include <iostream>
+#include <stdexcept>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "p9813.hpp"
+
+using namespace upm;
+
+P9813::P9813(uint16_t ledCount, uint16_t clkPin, uint16_t dataPin, bool batchMode)
+        : m_leds(ledCount), m_clkGpio(clkPin), m_dataGpio(dataPin), m_batchMode(batchMode)
+{
+    mraa::Result res = mraa::SUCCESS;
+
+    // Set GPIO pins to output direction
+    res = m_clkGpio.dir(mraa::DIR_OUT);
+    if (res != mraa::SUCCESS) {
+        throw std::invalid_argument(std::string(__FUNCTION__) +
+                                    ": GPIO failed to set direction");
+    }
+    res = m_dataGpio.dir(mraa::DIR_OUT);
+    if (res != mraa::SUCCESS) {
+        throw std::invalid_argument(std::string(__FUNCTION__) +
+                                    ": GPIO failed to set direction");
+    }
+}
+
+void
+P9813::setLed(uint16_t ledIdx, uint8_t r, uint8_t g, uint8_t b)
+{
+    setLeds(ledIdx, ledIdx, r, g, b);
+}
+
+void
+P9813::setAllLeds(uint8_t r, uint8_t g, uint8_t b)
+{
+    setLeds(0, m_leds.size() - 1, r, g, b);
+}
+
+void
+P9813::setLeds(uint16_t startIdx, uint16_t endIdx, uint8_t r, uint8_t g, uint8_t b)
+{
+    for (uint16_t i = startIdx; i <= endIdx; i++) {
+	m_leds[i].red = r;
+	m_leds[i].green = g;
+	m_leds[i].blue = b;
+    }
+
+    if (!m_batchMode) {
+        pushState();
+    }
+}
+
+void
+P9813::setLeds(uint16_t startIdx, uint16_t endIdx, std::vector<RgbColor> colors)
+{
+    for (uint16_t i = startIdx, j = 0; i <= endIdx; i++) {
+	m_leds[i].red = colors[j].red;
+	m_leds[i].green = colors[j].green;
+	m_leds[i].blue = colors[j].blue;
+    }
+
+    if (!m_batchMode) {
+        pushState();
+    }
+}
+
+void
+P9813::pushState(void)
+{
+    // Begin data frame
+    sendByte(0x00);
+    sendByte(0x00);
+    sendByte(0x00);
+    sendByte(0x00);
+
+    for (uint16_t i = 0; i <= m_leds.size(); i++) {
+	uint8_t red = m_leds[i].red;
+        uint8_t green = m_leds[i].green;
+        uint8_t blue = m_leds[i].blue;
+        // The first byte is 11 followed by inverted bits 7 and 6 of blue, green, and red
+        uint8_t byte0 = 0xFF;
+        byte0 ^= (blue >> 2) & 0x30; // XOR bits 4-5
+        byte0 ^= (green >> 4) & 0xC0; // XOR bits 2-3
+        byte0 ^= (red >> 6) & 0x03; // XOR bits 0-1
+	sendByte(byte0);
+        sendByte(blue);
+        sendByte(green);
+        sendByte(red);
+    }
+
+    // End data frame
+    sendByte(0x00);
+    sendByte(0x00);
+    sendByte(0x00);
+    sendByte(0x00);
+}
+
+/*
+ * **************
+ *  private area
+ * **************
+*/
+
+void
+P9813::sendByte(uint8_t data)
+{
+    for (uint16_t i = 0; i < 8; i++) {
+        // Write the data bit
+        m_dataGpio.write((data & 0x80) >> 7);
+	// Pulse the clock
+        m_clkGpio.write(1);
+        usleep(20);
+        m_clkGpio.write(0);
+        usleep(20);
+
+	// Shift to the next data bit
+        data <<= 1;
+    }
+}