CJQ4435 MOSFET: Add string based constructor

Signed-off-by: Adelin Dobre <adelin.dobre@rinftech.com>

src/cjq4435/cjq4435.cxx

@@ -27,6 +27,7 @@
 #include <stdexcept>
 
 #include "cjq4435.hpp"
+#include "upm_string_parser.hpp"
 
 using namespace upm;
 using namespace std;
@@ -39,6 +40,73 @@ CJQ4435::CJQ4435(int pin) :
                                  ": cjq4435_init() failed");
 }
 
+CJQ4435::CJQ4435(std::string initStr) : mraaIo(initStr)
+{
+    mraa_io_descriptor* descs = mraaIo.getMraaDescriptors();
+    std::vector<std::string> upmTokens;
+
+    if(!mraaIo.getLeftoverStr().empty()) {
+        upmTokens = UpmStringParser::parse(mraaIo.getLeftoverStr());
+    }
+
+    // make sure MRAA is initialized
+    int mraa_rv;
+    if ((mraa_rv = mraa_init()) != MRAA_SUCCESS)
+    {
+        printf("%s: mraa_init() failed (%d).\n", __FUNCTION__, mraa_rv);
+        throw std::runtime_error(std::string(__FUNCTION__) +
+                                 ": cjq4435_init() failed");
+    }
+
+    m_cjq4435 = (cjq4435_context)malloc(sizeof(struct _cjq4435_context));
+    if(!m_cjq4435) {
+        throw std::runtime_error(std::string(__FUNCTION__) +
+                                 ": cjq4435_init() failed");
+    }
+
+    // zero out context
+    memset((void *)m_cjq4435, 0, sizeof(struct _cjq4435_context));
+
+    if(!descs->pwms) {
+        printf("%s: mraa_pwm_init() failed.\n", __FUNCTION__);
+        cjq4435_close(m_cjq4435);
+        throw std::runtime_error(std::string(__FUNCTION__) +
+                                 ": cjq4435_init() failed");
+    } else {
+        if( !(m_cjq4435->pwm = descs->pwms[0]) ) {
+            printf("%s: mraa_pwm_init() failed.\n", __FUNCTION__);
+            cjq4435_close(m_cjq4435);
+            throw std::runtime_error(std::string(__FUNCTION__) +
+                                     ": cjq4435_init() failed");
+        }
+    }
+
+    m_cjq4435->enabled = false;
+
+    for(std::string tok : upmTokens) {
+        if(tok.substr(0,12) == "setPeriodUS:") {
+            int us = std::stoi(tok.substr(0,12),nullptr,0);
+            setPeriodUS(us);
+        }
+        if(tok.substr(0,12) == "setPeriodMS:") {
+            int ms = std::stoi(tok.substr(0,12),nullptr,0);
+            setPeriodMS(ms);
+        }
+        if(tok.substr(0,17) == "setPeriodSeconds:") {
+            float seconds = std::stof(tok.substr(0,17));
+            setPeriodSeconds(seconds);
+        }
+        if(tok.substr(0,7) == "enable:") {
+            bool en = std::stoi(tok.substr(0,7),nullptr,0);
+            enable(en);
+        }
+        if(tok.substr(0,13) == "setDutyCycle:") {
+            float dutyCycle = std::stof(tok.substr(0,13));
+            setDutyCycle(dutyCycle);
+        }
+    }
+}
+
 CJQ4435::~CJQ4435()
 {
     cjq4435_close(m_cjq4435);

src/cjq4435/cjq4435.hpp

@@ -23,6 +23,7 @@
  */
 #pragma once
 
+#include "mraa/initio.hpp"
 #include "cjq4435.h"
 
 namespace upm {
@@ -63,6 +64,13 @@ namespace upm {
          */
         CJQ4435(int pin);
 
+        /**
+         * Instantiates CJQ4435 MOSFET based on a given string.
+         *
+         * @param initStr string containing specific information for CJQ4435 MOSFET.
+         */
+        CJQ4435(std::string initStr);
+
         /**
          * CJQ4435 destructor
          */
@@ -118,6 +126,7 @@ namespace upm {
 
     protected:
         cjq4435_context m_cjq4435;
+        mraa::MraaIo mraaIo;
 
     private:
         /* Disable implicit copy and assignment operators */