firmata: Added option to set uart non blocking state

Signed-off-by: Shiran Ben-Melech <shiran.ben-melech@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

api/mraa/uart.h

@@ -118,6 +118,15 @@ mraa_result_t mraa_uart_set_flowcontrol(mraa_uart_context dev, mraa_boolean_t xo
  */
 mraa_result_t mraa_uart_set_timeout(mraa_uart_context dev, int read, int write, int interchar);
 
+/**
+ * Set the blocking state for write operations
+ *
+ * @param dev The UART context
+ * @param nonblock new nonblocking state
+ * @return Result of operation
+ */
+mraa_result_t mraa_uart_set_non_blocking(mraa_uart_context dev, mraa_boolean_t nonblock);
+
 /**
  * Get Char pointer with tty device path within Linux
  * For example. Could point to "/dev/ttyS0"

api/mraa/uart.hpp

@@ -236,6 +236,19 @@ class Uart
         return (Result) mraa_uart_set_timeout(m_uart, read, write, interchar);
     }
 
+    /**
+     * Set the blocking state for write operations
+     *
+     * @param dev The UART context
+     * @param nonblock new nonblocking state
+     * @return Result of operation
+     */
+    Result
+    SetNonBlocking(bool nonblock)
+    {
+        return (Result) mraa_uart_set_non_blocking(m_uart, nonblock);
+    }
+
   private:
     mraa_uart_context m_uart;
 };