mraajs.i: add i2c read/write function typemaps

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

diff --git a/src/javascript/mraajs.i b/src/javascript/mraajs.i
index 7db1285..85a8d60 100644 (file)
--- a/src/javascript/mraajs.i
+++ b/src/javascript/mraajs.i
@@ -2,4 +2,44 @@
 
 %feature("autodoc", "3");
 
+%array_class(uint8_t, uint8Array);
+
+%inline %{
+  #include <node_buffer.h>
+%}
+
+// i2c write()
+%typemap(in) (const uint8_t *data, int length) {
+  $1 = (uint8_t*) node::Buffer::Data($input);
+  $2 = node::Buffer::Length($input);
+}
+
+%newobject I2c::read(uint8_t *data, int length);
+
+%typemap(in) (uint8_t *data, int length) {
+   int x;
+   int ecode = SWIG_AsVal_int($input, &x);
+   if (!SWIG_IsOK(ecode)) {
+     SWIG_exception_fail(SWIG_ArgError(ecode), "Expected an int");
+   }
+   $2 = x;
+   if ($2 < 0) {
+       SWIG_exception_fail(SWIG_ERROR, "Positive integer expected");
+       SWIGV8_RETURN(v8::Undefined());
+   }
+   $1 = (uint8_t*) malloc($2 * sizeof(uint8_t));
+}
+
+%typemap(argout) (uint8_t *data, int length) {
+   if (result < 0) {      /* Check for I/O error */
+       free($1);
+       SWIG_exception_fail(SWIG_ERROR, "I2c write failed");
+       SWIGV8_RETURN(v8::Undefined());
+   }
+   // Append output value $1 to $result
+   // return the v8::handle of the node_buffer
+   $result = node::Buffer::New((char*) $1, result)->handle_;
+   free($1);
+}
+
 %include ../mraa.i