hlg150: Initial Implementation Meanwell HLG150 based LED light controller

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>

src/hlg150h/hlg150h.cxx

@@ -0,0 +1,96 @@
+#include <iostream>
+#include <stdexcept>
+#include <unistd.h>
+#include "hlg150h.h"
+#include "mraa-utils.h"
+
+#define PWM_PERIOD 3333
+
+using namespace upm;
+
+HLG150H::HLG150H(int pinRelay, int pinPWM)
+{
+   int dutyPercent = 0;
+   status = mraa::SUCCESS;
+   this->pinRelay = pinRelay;
+   isPoweredShadow = false;
+   pwmBrightness = new mraa::Pwm(pinPWM);
+   if (pwmBrightness == NULL)
+      UPM_THROW("pwm init failed");
+   status = pwmBrightness->enable(true);
+   status = pwmBrightness->period_us(PWM_PERIOD);
+   if (!isConfigured())
+      UPM_THROW("pwm config failed.");
+   dutyPercent = getBrightness();
+   isPoweredShadow = dutyPercent > 10;
+}
+
+HLG150H::~HLG150H()
+{
+   delete pwmBrightness;
+}
+
+bool HLG150H::isConfigured()
+{
+   return status == mraa::SUCCESS;
+}
+
+
+void HLG150H::setPowerOn()
+{
+   isPoweredShadow = true;
+   MraaUtils::setGpio(pinRelay, 0);
+}
+
+void HLG150H::setPowerOff()
+{
+   isPoweredShadow = false;
+   MraaUtils::setGpio(pinRelay, 1);
+}
+
+bool HLG150H::isPowered()
+{
+   // Can't read GPIO state as setting in to input mode turns off relay
+   // Instead we return a shadow variable
+   /*
+   int level;
+   if (MraaUtils::getGpio(pinRelay, &level) == MRAA_SUCCESS)
+      return level == 1;
+   else
+      return false;
+   */
+   return isPoweredShadow;
+}
+
+
+// If duty is less than 10% light will flicker
+void HLG150H::setBrightness(int dutyPercent)
+{
+   if (dutyPercent < 10)
+      dutyPercent = 10;
+   if (isConfigured())
+   {
+      int dutyUs = (PWM_PERIOD * dutyPercent) / 100;
+      dutyUs = PWM_PERIOD - dutyUs;
+      status = pwmBrightness->pulsewidth_us(dutyUs);
+      // std::cout << "Brightness = " << dutyPercent << "%, duty = " << dutyUs << "us" << std::endl;      
+   }
+   else
+      UPM_THROW("setBrightness failed");
+
+}
+
+
+int HLG150H::getBrightness()
+{
+   if (isConfigured())
+   {
+      float duty = pwmBrightness->read();
+      int dutyPercent = static_cast<int>(100.0 * (1.0 - duty) + 0.5);
+      return dutyPercent;
+   }
+   else
+      UPM_THROW("getBrightness failed");
+}
+
+