ABP: Add string based constructor for Pressure Sensor

src/abp/abp.cxx

@@ -26,6 +26,7 @@
 #include <string>
 #include <stdexcept>
 
+#include "upm_string_parser.hpp"
 #include "abp.hpp"
 
 using namespace upm;
@@ -38,6 +39,64 @@ ABP::ABP(int bus, int devAddress) :
                                 ": abp_init failed");
 }
 
+ABP::ABP(std::string initStr) : mraaIo(initStr)
+{
+    mraa_io_descriptor* descs = mraaIo.getMraaDescriptors();
+    std::vector<std::string> upmTokens;
+
+    if(mraaIo.getLeftoverStr() != "")
+    {
+        upmTokens = UpmStringParser::parse(mraaIo.getLeftoverStr());
+    }
+
+    m_abp = (abp_context)malloc(sizeof(struct _abp_context));
+
+    if(!m_abp)
+    {
+        throw std::runtime_error(std::string(__FUNCTION__) +
+                                ": abp_init failed");
+    }
+
+    // make sure MRAA is initialized
+    int mraa_rv;
+    if ((mraa_rv = mraa_init()) != MRAA_SUCCESS)
+    {
+       throw std::runtime_error(std::string(__FUNCTION__) +
+                                ": mraa_init() failed");
+    }
+
+    if(!descs->i2cs)
+    {
+      abp_close(m_abp);
+      throw std::runtime_error(std::string(__FUNCTION__) +
+                                ": mraa_i2c_init() failed");
+    }
+    else
+    {
+        if( !(m_abp->i2c = descs->i2cs[0]) )
+        {
+            abp_close(m_abp);
+            throw std::runtime_error(std::string(__FUNCTION__) +
+                                ": mraa_i2c_init() failed");
+        }
+    }
+
+    // setting up defaults
+    m_abp->abp_pressure_max = 5;
+    m_abp->abp_pressure_min = 0;
+
+    for (std::string tok : upmTokens) {
+      if(tok.substr(0,12) == "maxPressure:") {
+          int pmax = std::stoi(tok.substr(12),nullptr,0);
+          setMaxPressure(pmax);
+      }
+      if(tok.substr(0,12) == "minPressure:") {
+          int pmin  = std::stoi(tok.substr(12),nullptr,0);
+          setMinPressure(pmin);
+      }
+    }
+}
+
 ABP::~ABP()
 {
     abp_close(m_abp);

src/abp/abp.hpp

@@ -21,9 +21,11 @@
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
- 
+
 #pragma once
 
+#include <string>
+#include <mraa/initio.hpp>
 #include "abp.h"
 
 namespace upm {
@@ -69,6 +71,12 @@ namespace upm {
          * @param devAddress i2c address of the sensor
          */
         ABP(int bus, int devAddress);
+        /**
+         * Instantiates an ABP sensor object based on a given string.
+         *
+         * @param initStr string containing specific information for ABP sensor initialization.
+         */
+        ABP(std::string initStr);
         /**
          * ABP destructor
          */
@@ -120,8 +128,9 @@ namespace upm {
          */
         void setMinPressure(int min);
     private:
+        mraa::MraaIo mraaIo;
         abp_context m_abp;
         ABP(const ABP& src) { /* do not create copied constructor */}
         ABP& operator=(const ABP&) {return *this;}
     };
-}
+}