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Fix Greentea test code with wakeup from deepsleep #7288

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Jun 21, 2018
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Fix Greentea test code with wakeup from deepsleep #7288

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20 changes: 18 additions & 2 deletions TESTS/mbed_hal/sleep/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,22 @@

#define US_PER_S 1000000

/* Flush serial buffer before deep sleep
*
* Since deepsleep() may shut down the UART peripheral, we wait for some time
* to allow for hardware serial buffers to completely flush.
*
* Take NUMAKER_PFM_NUC472 as an example:
* Its UART peripheral has 16-byte Tx FIFO. With baud rate set to 9600, flush
* Tx FIFO would take: 16 * 8 * 1000 / 9600 = 13.3 (ms). So set wait time to
* 20ms here for safe.
*
* 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.
*/
#define SERIAL_FLUSH_TIME_MS 20

using namespace utest::v1;

/* The following ticker frequencies are possible:
Expand Down Expand Up @@ -167,7 +183,7 @@ void deepsleep_lpticker_test()
/* Give some time Green Tea to finish UART transmission before entering
* deep-sleep mode.
*/
wait_ms(10);
wait_ms(SERIAL_FLUSH_TIME_MS);

TEST_ASSERT_TRUE_MESSAGE(sleep_manager_can_deep_sleep(), "deep sleep should not be locked");

Expand Down Expand Up @@ -202,7 +218,7 @@ void deepsleep_high_speed_clocks_turned_off_test()
/* Give some time Green Tea to finish UART transmission before entering
* deep-sleep mode.
*/
wait_ms(10);
wait_ms(SERIAL_FLUSH_TIME_MS);

TEST_ASSERT_TRUE_MESSAGE(sleep_manager_can_deep_sleep(), "deep sleep should not be locked");

Expand Down