Added echoing for UART test double (#13)

* added tiny

* lol whoops

* whitespace

test/include/double/tiny_uart_double.hpp

@@ -17,6 +17,7 @@ typedef struct {
   tiny_event_t send_complete;
   bool automatic_send_complete;
   bool sending;
+  bool echoing;
 } tiny_uart_double_t;
 
 /*!
@@ -44,4 +45,9 @@ void tiny_uart_double_trigger_receive(tiny_uart_double_t* self, uint8_t byte);
  */
 void tiny_uart_double_configure_automatic_send_complete(tiny_uart_double_t* self, bool enabled);
 
+/*!
+ * When enabled, the double will raise a receive event when a byte is sent. Defaults to disabled.
+ */
+void tiny_uart_double_enable_echo(tiny_uart_double_t* self);
+
 #endif

test/src/tiny_uart_double.cpp

@@ -16,6 +16,10 @@ static void send(i_tiny_uart_t* _self, uint8_t byte)
   if(self->automatic_send_complete) {
     tiny_uart_double_trigger_send_complete(self);
   }
+
+  if(self->echoing) {
+    tiny_uart_double_trigger_receive(self, byte);
+  }
 }
 
 static i_tiny_event_t* on_send_complete(i_tiny_uart_t* _self)
@@ -37,6 +41,8 @@ void tiny_uart_double_init(tiny_uart_double_t* self)
   self->interface.api = &api;
   self->sending = false;
   self->automatic_send_complete = false;
+  self->echoing = false;
+
   tiny_event_init(&self->send_complete);
   tiny_event_init(&self->receive);
 }
@@ -62,3 +68,8 @@ void tiny_uart_double_configure_automatic_send_complete(tiny_uart_double_t* self
 {
   self->automatic_send_complete = enabled;
 }
+
+void tiny_uart_double_enable_echo(tiny_uart_double_t* self)
+{
+  self->echoing = true;
+}