Test: Watchdog: Fix error handling

Add a watchdog-kicking thread running in the background when the test
suite is handling a failed assertion. A single watchdog kick did not
provide enough time for the greentea communication if the watchdog
reset happened later than expected.

TESTS/mbed_drivers/watchdog_reset/main.cpp

@@ -87,6 +87,19 @@ void release_sem(Semaphore *sem)
 
 testcase_data current_case;
 
+Thread wdg_kicking_thread(osPriorityNormal, 768);
+Semaphore kick_wdg_during_test_teardown(0, 1);
+
+void wdg_kicking_thread_fun()
+{
+    kick_wdg_during_test_teardown.acquire();
+    Watchdog &watchdog = Watchdog::get_instance();
+    while (true) {
+        watchdog.kick();
+        wait_us(20000);
+    }
+}
+
 bool send_reset_notification(testcase_data *tcdata, uint32_t delay_ms)
 {
     char msg_value[12];
@@ -124,7 +137,7 @@ void test_simple_reset()
 
     // Watchdog reset should have occurred during wait_ms() above;
 
-    watchdog.kick();  // Just to buy some time for testsuite failure handling.
+    kick_wdg_during_test_teardown.release(); // For testsuite failure handling.
     TEST_ASSERT_MESSAGE(0, "Watchdog did not reset the device as expected.");
 }
 
@@ -161,7 +174,7 @@ void test_sleep_reset()
 
     // Watchdog reset should have occurred during sem.wait() (sleep) above;
 
-    watchdog.kick();  // Just to buy some time for testsuite failure handling.
+    kick_wdg_during_test_teardown.release(); // For testsuite failure handling.
     TEST_ASSERT_MESSAGE(0, "Watchdog did not reset the device as expected.");
 }
 
@@ -196,7 +209,7 @@ void test_deepsleep_reset()
 
     // Watchdog reset should have occurred during sem.wait() (deepsleep) above;
 
-    watchdog.kick();  // Just to buy some time for testsuite failure handling.
+    kick_wdg_during_test_teardown.release(); // For testsuite failure handling.
     TEST_ASSERT_MESSAGE(0, "Watchdog did not reset the device as expected.");
 }
 #endif
@@ -241,7 +254,7 @@ void test_restart_reset()
 
     // Watchdog reset should have occurred during that wait() above;
 
-    watchdog.kick();  // Just to buy some time for testsuite failure handling.
+    kick_wdg_during_test_teardown.release(); // For testsuite failure handling.
     TEST_ASSERT_MESSAGE(0, "Watchdog did not reset the device as expected.");
 }
 
@@ -274,7 +287,7 @@ void test_kick_reset()
 
     // Watchdog reset should have occurred during that wait() above;
 
-    watchdog.kick();  // Just to buy some time for testsuite failure handling.
+    kick_wdg_during_test_teardown.release(); // For testsuite failure handling.
     TEST_ASSERT_MESSAGE(0, "Watchdog did not reset the device as expected.");
 }
 
@@ -309,6 +322,10 @@ int testsuite_setup(const size_t number_of_cases)
         return utest::v1::STATUS_ABORT;
     }
 
+    // The thread is started here, but feeding the watchdog will start
+    // when the semaphore is released during a test case teardown.
+    wdg_kicking_thread.start(mbed::callback(wdg_kicking_thread_fun));
+
     utest_printf("This test suite is composed of %i test cases. Starting at index %i.\n", number_of_cases,
                  current_case.start_index);
     return current_case.start_index;

TESTS/mbed_hal/watchdog_reset/main.cpp

@@ -85,6 +85,18 @@ void release_sem(Semaphore *sem)
 
 testcase_data current_case;
 
+Thread wdg_kicking_thread(osPriorityNormal, 768);
+Semaphore kick_wdg_during_test_teardown(0, 1);
+
+void wdg_kicking_thread_fun()
+{
+    kick_wdg_during_test_teardown.acquire();
+    while (true) {
+        hal_watchdog_kick();
+        wait_us(20000);
+    }
+}
+
 bool send_reset_notification(testcase_data *tcdata, uint32_t delay_ms)
 {
     char msg_value[12];
@@ -120,7 +132,7 @@ void test_simple_reset()
 
     // Watchdog reset should have occurred during wait_ms() above;
 
-    hal_watchdog_kick();  // Just to buy some time for testsuite failure handling.
+    kick_wdg_during_test_teardown.release(); // For testsuite failure handling.
     TEST_ASSERT_MESSAGE(0, "Watchdog did not reset the device as expected.");
 }
 
@@ -155,7 +167,7 @@ void test_sleep_reset()
 
     // Watchdog reset should have occurred during sem.wait() (sleep) above;
 
-    hal_watchdog_kick();  // Just to buy some time for testsuite failure handling.
+    kick_wdg_during_test_teardown.release(); // For testsuite failure handling.
     TEST_ASSERT_MESSAGE(0, "Watchdog did not reset the device as expected.");
 }
 
@@ -188,7 +200,7 @@ void test_deepsleep_reset()
 
     // Watchdog reset should have occurred during sem.wait() (deepsleep) above;
 
-    hal_watchdog_kick();  // Just to buy some time for testsuite failure handling.
+    kick_wdg_during_test_teardown.release(); // For testsuite failure handling.
     TEST_ASSERT_MESSAGE(0, "Watchdog did not reset the device as expected.");
 }
 #endif
@@ -229,7 +241,7 @@ void test_restart_reset()
 
     // Watchdog reset should have occurred during that wait() above;
 
-    hal_watchdog_kick();  // Just to buy some time for testsuite failure handling.
+    kick_wdg_during_test_teardown.release(); // For testsuite failure handling.
     TEST_ASSERT_MESSAGE(0, "Watchdog did not reset the device as expected.");
 }
 
@@ -260,7 +272,7 @@ void test_kick_reset()
 
     // Watchdog reset should have occurred during that wait() above;
 
-    hal_watchdog_kick();  // Just to buy some time for testsuite failure handling.
+    kick_wdg_during_test_teardown.release(); // For testsuite failure handling.
     TEST_ASSERT_MESSAGE(0, "Watchdog did not reset the device as expected.");
 }
 
@@ -295,6 +307,10 @@ int testsuite_setup(const size_t number_of_cases)
         return utest::v1::STATUS_ABORT;
     }
 
+    // The thread is started here, but feeding the watchdog will start
+    // when the semaphore is released during a test case teardown.
+    wdg_kicking_thread.start(mbed::callback(wdg_kicking_thread_fun));
+
     utest_printf("This test suite is composed of %i test cases. Starting at index %i.\n", number_of_cases,
                  current_case.start_index);
     return current_case.start_index;