Update HAL Sleep manager test to cope with STM32 LPTIM HW

In particular and as kindly suggested by Przemec S. :
1.	Add setup/teardown handler’s for all cases. This disables sys-tick, so there should be no unexpected lp ticker interrupt scheduling.
2.	Modify setup/teardown handler’s: remove suspension of lp/us tickers, so they can count as this is required by test_lock_unlock_test_check test case.
3.	Use TEST_ASSERT_TRUE(sleep_manager_can_deep_sleep_test_check()) after setting interrupt to cope with STM specific handling (CMPOK interrupt with deep-sleep locked). This performs wait only if needed and will not affect other targets which do not need extra wait.
4.	Move sleep_manager_lock_deep_sleep() after TEST_ASSERT_TRUE(sleep_manager_can_deep_sleep_test_check())

TESTS/mbed_hal/sleep_manager/main.cpp

@@ -34,6 +34,26 @@ using utest::v1::Case;
 using utest::v1::Specification;
 using utest::v1::Harness;
 
+/* Make sure there are enough ticks to cope with more than SLEEP_DURATION_US sleep
+ * without hitting the wrap-around.
+ */
+void wraparound_lp_protect(void)
+{
+ uint32_t time_window;
+
+ const uint32_t ticks_now = get_lp_ticker_data()->interface->read();
+ const ticker_info_t *p_ticker_info = get_lp_ticker_data()->interface->get_info();
+
+ const uint32_t max_count = ((1 << p_ticker_info->bits) - 1);
+ const uint32_t delta_ticks = us_to_ticks(SLEEP_DURATION_US * 1.5, p_ticker_info->frequency);
+
+ if (ticks_now < (max_count - delta_ticks)) {
+ return;
+ }
+
+ while (get_lp_ticker_data()->interface->read() > (max_count - delta_ticks));
+}
+
 void test_lock_unlock()
 {
  TEST_ASSERT_TRUE(sleep_manager_can_deep_sleep());
@@ -68,32 +88,19 @@ utest::v1::status_t testcase_setup(const Case *const source, const size_t index_
 {
  // Suspend the RTOS kernel scheduler to prevent interference with duration of sleep.
  osKernelSuspend();
-#if DEVICE_LPTICKER
- ticker_suspend(get_lp_ticker_data());
-#if (LPTICKER_DELAY_TICKS > 0)
- // Suspend the low power ticker wrapper to prevent interference with deep sleep lock.
- lp_ticker_wrapper_suspend();
-#endif
-#endif
- ticker_suspend(get_us_ticker_data());
+
  // Make sure HAL tickers are initialized.
  us_ticker_init();
 #if DEVICE_LPTICKER
  lp_ticker_init();
 #endif
+
  return utest::v1::greentea_case_setup_handler(source, index_of_case);
 }
 
 utest::v1::status_t testcase_teardown(const Case *const source, const size_t passed, const size_t failed,
  const utest::v1::failure_t failure)
 {
- ticker_resume(get_us_ticker_data());
-#if DEVICE_LPTICKER
-#if (LPTICKER_DELAY_TICKS > 0)
- lp_ticker_wrapper_resume();
-#endif
- ticker_resume(get_lp_ticker_data());
-#endif
  osKernelResume(0);
  return utest::v1::greentea_case_teardown_handler(source, passed, failed, failure);
 }
@@ -115,10 +122,18 @@ void test_sleep_auto()
  const ticker_irq_handler_type lp_ticker_irq_handler_org = set_lp_ticker_irq_handler(lp_ticker_isr);
  us_timestamp_t us_ts1, us_ts2, lp_ts1, lp_ts2, us_diff1, us_diff2, lp_diff1, lp_diff2;
 
- sleep_manager_lock_deep_sleep();
+ /* Let's avoid the Lp ticker wrap-around case */
+ wraparound_lp_protect();
  uint32_t lp_wakeup_ts_raw = lp_ticker_read() + us_to_ticks(SLEEP_DURATION_US, lp_ticker_info->frequency);
  timestamp_t lp_wakeup_ts = overflow_protect(lp_wakeup_ts_raw, lp_ticker_info->bits);
  lp_ticker_set_interrupt(lp_wakeup_ts);
+
+ /* Some targets may need an interrupt short time after LPTIM interrupt is
+ * set and forbid deep_sleep during that period. Let this period pass */
+ TEST_ASSERT_TRUE(sleep_manager_can_deep_sleep_test_check());
+
+ sleep_manager_lock_deep_sleep();
+
  us_ts1 = ticks_to_us(us_ticker_read(), us_ticker_info->frequency);
  lp_ts1 = ticks_to_us(lp_ticker_read(), lp_ticker_info->frequency);
 
@@ -144,13 +159,21 @@ void test_sleep_auto()
  // Wait for hardware serial buffers to flush.
  busy_wait_ms(SERIAL_FLUSH_TIME_MS);
 
+ /* Let's avoid the Lp ticker wrap-around case */
+ wraparound_lp_protect();
  lp_wakeup_ts_raw = lp_ticker_read() + us_to_ticks(SLEEP_DURATION_US, lp_ticker_info->frequency);
  lp_wakeup_ts = overflow_protect(lp_wakeup_ts_raw, lp_ticker_info->bits);
  lp_ticker_set_interrupt(lp_wakeup_ts);
+
+ /* Some targets may need an interrupt short time after LPTIM interrupt is
+ * set and forbid deep_sleep during that period. Let this period pass */
+ TEST_ASSERT_TRUE(sleep_manager_can_deep_sleep_test_check());
+
  us_ts1 = ticks_to_us(us_ticker_read(), us_ticker_info->frequency);
  lp_ts1 = ticks_to_us(lp_ticker_read(), lp_ticker_info->frequency);
 
  sleep_manager_sleep_auto();
+
  us_ts2 = ticks_to_us(us_ticker_read(), us_ticker_info->frequency);
  us_diff2 = (us_ts1 <= us_ts2) ? (us_ts2 - us_ts1) : (us_ticker_mask - us_ts1 + us_ts2 + 1);
  lp_ts2 = ticks_to_us(lp_ticker_read(), lp_ticker_info->frequency);
@@ -232,16 +255,25 @@ utest::v1::status_t testsuite_setup(const size_t number_of_cases)
 }
 
 Case cases[] = {
- Case("deep sleep lock/unlock", test_lock_unlock),
- Case("deep sleep locked USHRT_MAX times", test_lock_eq_ushrt_max),
+ Case("deep sleep lock/unlock",
+ (utest::v1::case_setup_handler_t) testcase_setup,
+ test_lock_unlock,
+ (utest::v1::case_teardown_handler_t) testcase_teardown),
+ Case("deep sleep locked USHRT_MAX times",
+ (utest::v1::case_setup_handler_t) testcase_setup,
+ test_lock_eq_ushrt_max,
+ (utest::v1::case_teardown_handler_t) testcase_teardown),
 #if DEVICE_LPTICKER
 #if DEVICE_USTICKER
  Case("sleep_auto calls sleep/deep sleep based on lock",
  (utest::v1::case_setup_handler_t) testcase_setup,
  test_sleep_auto,
  (utest::v1::case_teardown_handler_t) testcase_teardown),
 #endif
- Case("deep sleep lock/unlock test_check", test_lock_unlock_test_check),
+ Case("deep sleep lock/unlock test_check",
+ (utest::v1::case_setup_handler_t) testcase_setup,
+ test_lock_unlock_test_check,
+ (utest::v1::case_teardown_handler_t) testcase_teardown),
 #endif
 };