lpd8806: added bus parameter to constructor

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

docs/apichanges.md

@@ -151,6 +151,10 @@ compatibility between releases:
  and Python, the examples have been modified to use these methods
  rather than the methods that return data in argument pointers or
  arrays.
+ 
+ * **lpd8806** The constructor for this driver was updated to allow specifying
+ a SPI bus number. This is now the first parameter, the number of LEDs on the
+ strip is now the last (3rd) parameter instead.
 
 # v1.1.0
 

examples/c++/lpd8806.cxx

@@ -46,7 +46,7 @@ int
 main(int argc, char **argv)
 {
     //! [Interesting]
-    sensor = new upm::LPD8806(10, 7);
+    sensor = new upm::LPD8806(0, 7, 10);
     usleep (1000000);
 
     sensor->show ();

src/lpd8806/lpd8806.cxx

@@ -32,7 +32,7 @@
 
 using namespace upm;
 
-LPD8806::LPD8806 (uint16_t pixelCount, int csn) :m_spi(0), m_csnPinCtx(csn) {
+LPD8806::LPD8806 (int bus, int csn, uint16_t pixelCount) :m_spi(bus), m_csnPinCtx(csn) {
     mraa::Result error = mraa::SUCCESS;
     m_name = "LPD8806";
 

src/lpd8806/lpd8806.hpp

@@ -63,10 +63,11 @@ class LPD8806 {
         /**
          * Instantiates an LPD8806 object
          *
-         * @param pixelCount Number of pixels in the strip
+         * @param bus SPI bus to use
          * @param csn Chip select pin
+         * @param pixelCount Number of pixels in the strip
          */
-        LPD8806 (uint16_t pixelCount, int csn);
+        LPD8806 (int bus, int csn, uint16_t pixelCount);
 
         /**
          * LPD8806 object destructor; basically, it frees the allocated