lp ticker tests: fix timeout usage

Using Timer should be better, as we stay in the current context meanwhile.

Author: 0xc0170

TESTS/mbed_drivers/lp_timeout/main.cpp

@@ -49,9 +49,16 @@ void lp_timeout_1s_deepsleep(void)
 
      * This should be replaced with a better function that checks if the
      * hardware buffers are empty. However, such an API does not exist now,
-     * so we'll use the wait_ms() function for now.
+     * so we'll use the Timer for now.
      */
-    wait_ms(10);
+    {
+        Timer timer;
+        timer.start();
+        int start = timer.read_ms();
+        int end = start + 10;
+        while (timer.read_ms() < end) {
+        }
+    }
 
     /*
      * We use here lp_ticker_read() instead of us_ticker_read() for start and

TESTS/mbed_hal/lp_ticker/main.cpp

@@ -78,9 +78,16 @@ void lp_ticker_1s_deepsleep()
 
      * This should be replaced with a better function that checks if the
      * hardware buffers are empty. However, such an API does not exist now,
-     * so we'll use the wait_ms() function for now.
+     * so we'll use the Timer for now.
      */
-    wait_ms(10);
+    {
+        Timer timer;
+        timer.start();
+        int start = timer.read_ms();
+        int end = start + 10;
+        while (timer.read_ms() < end) {
+        }
+    }
 
     ticker_set_handler(lp_ticker_data, cb_done_deepsleep);
     ticker_remove_event(lp_ticker_data, &delay_event);