Merge pull request #212 from ssoerensen/master

Added support for the APA102 LED Strip

Author: poljvd

doc/datasheets/APA102_LED.pdf

@@ -57,6 +57,7 @@ if(ENABLE_SPIDEV)
 			${CURRENT_SOURCE_DIR}/LedDeviceLpd8806.h
 			${CURRENT_SOURCE_DIR}/LedDeviceP9813.h
 			${CURRENT_SOURCE_DIR}/LedDeviceWs2801.h
+			${CURRENT_SOURCE_DIR}/LedDeviceAPA102.h
 	)
 	SET(Leddevice_SOURCES
 			${Leddevice_SOURCES}
@@ -65,6 +66,7 @@ if(ENABLE_SPIDEV)
 			${CURRENT_SOURCE_DIR}/LedDeviceLpd8806.cpp
 			${CURRENT_SOURCE_DIR}/LedDeviceP9813.cpp
 			${CURRENT_SOURCE_DIR}/LedDeviceWs2801.cpp
+			${CURRENT_SOURCE_DIR}/LedDeviceAPA102.cpp
 	)
 endif(ENABLE_SPIDEV)
 

libsrc/leddevice/CMakeLists.txt

@@ -0,0 +1,42 @@
+
+// STL includes
+#include <cstring>
+#include <cstdio>
+#include <iostream>
+
+// Linux includes
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+// hyperion local includes
+#include "LedDeviceAPA102.h"
+
+LedDeviceAPA102::LedDeviceAPA102(const std::string& outputDevice, const unsigned baudrate) :
+	LedSpiDevice(outputDevice, baudrate, 500000),
+	_ledBuffer(0)
+{
+	// empty
+}
+
+int LedDeviceAPA102::write(const std::vector<ColorRgb> &ledValues)
+{
+	const unsigned int mLedCount = (ledValues.size() * 4) + 8;
+	if(_ledBuffer.size() != mLedCount){
+		_ledBuffer.resize(mLedCount, 0x00);
+	}
+
+	for (unsigned iLed=1; iLed<=ledValues.size(); ++iLed) {
+		const ColorRgb& rgb = ledValues[iLed];
+		_ledBuffer[iLed*4]   = 0xFF;
+		_ledBuffer[iLed*4+1] = rgb.red;
+		_ledBuffer[iLed*4+2] = rgb.green;
+		_ledBuffer[iLed*4+3] = rgb.blue;
+	}
+
+	return writeBytes(_ledBuffer.size(), _ledBuffer.data());
+}
+
+int LedDeviceAPA102::switchOff()
+{
+	return write(std::vector<ColorRgb>(_ledBuffer.size(), ColorRgb{0,0,0}));
+}

libsrc/leddevice/LedDeviceAPA102.cpp

@@ -0,0 +1,42 @@
+#pragma once
+
+// STL includes
+#include <string>
+
+// hyperion incluse
+#include "LedSpiDevice.h"
+
+///
+/// Implementation of the LedDevice interface for writing to APA102 led device.
+///
+/// APA102 is
+///
+class LedDeviceAPA102 : public LedSpiDevice
+{
+public:
+	///
+	/// Constructs the LedDevice for a string containing leds of the type APA102
+	///
+	/// @param outputDevice The name of the output device (eg '/etc/SpiDev.0.0')
+	/// @param baudrate The used baudrate for writing to the output device
+	///
+	LedDeviceAPA102(const std::string& outputDevice,
+					const unsigned baudrate);
+
+	///
+	/// Writes the led color values to the led-device
+	///
+	/// @param ledValues The color-value per led
+	/// @return Zero on succes else negative
+	///
+	virtual int write(const std::vector<ColorRgb> &ledValues);
+
+	/// Switch the leds off
+	virtual int switchOff();
+
+private:
+
+	/// The buffer containing the packed RGB values
+	std::vector<uint8_t> _ledBuffer;
+
+};

libsrc/leddevice/LedDeviceAPA102.h

@@ -14,6 +14,7 @@
 	#include "LedDeviceLpd8806.h"
 	#include "LedDeviceP9813.h"
 	#include "LedDeviceWs2801.h"
+	#include "LedDeviceAPA102.h"
 #endif
 
 #ifdef ENABLE_TINKERFORGE
@@ -86,6 +87,16 @@ LedDevice * LedDeviceFactory::construct(const Json::Value & deviceConfig)
 
 		device = deviceP9813;
 	}
+	else if (type == "apa102")
+	{
+		const std::string output = deviceConfig["output"].asString();
+		const unsigned rate      = deviceConfig["rate"].asInt();
+
+		LedDeviceAPA102* deviceAPA102 = new LedDeviceAPA102(output, rate);
+		deviceAPA102->open();
+
+		device = deviceAPA102;
+	}
 	else if (type == "ws2801" || type == "lightberry")
 	{
 		const std::string output = deviceConfig["output"].asString();