Merge pull request #12262 from fkjagodzinski/test_update-uart_flush_delay

Test: Increase the UART flush delay

Author: 0xc0170

TESTS/mbed_drivers/reset_reason/main.cpp

@@ -49,7 +49,20 @@
 #define MSG_KEY_RESET_REASON "reason"
 #define MSG_KEY_DEVICE_RESET "reset"
 
-#define SERIAL_FLUSH_TIME_MS 20
+/* To prevent a loss of Greentea data, the serial buffers have to be flushed
+ * before the UART peripheral shutdown. The UART shutdown happens when the
+ * device is entering the deepsleep mode or performing a reset.
+ *
+ * With the current API, it is not possible to check if the hardware buffers
+ * are empty. However, it is possible to determine the time required for the
+ * buffers to flush.
+ *
+ * Assuming the biggest Tx FIFO of 128 bytes (as for CY8CPROTO_062_4343W)
+ * and a default UART config (9600, 8N1), flushing the Tx FIFO wold take:
+ * (1 start_bit + 8 data_bits + 1 stop_bit) * 128 * 1000 / 9600 = 133.3 ms.
+ * To be on the safe side, set the wait time to 150 ms.
+ */
+#define SERIAL_FLUSH_TIME_MS 150
 
 typedef enum {
     CMD_STATUS_CONTINUE,

TESTS/mbed_drivers/watchdog/main.cpp

@@ -51,12 +51,12 @@
  * are empty. However, it is possible to determine the time required for the
  * buffers to flush.
  *
- * Take NUMAKER_PFM_NUC472 as an example:
- * The UART peripheral has 16-byte Tx FIFO. With a baud rate set to 9600,
- * flushing the Tx FIFO would take: 16 * 8 * 1000 / 9600 = 13.3 ms.
- * To be on the safe side, set the wait time to 20 ms.
+ * Assuming the biggest Tx FIFO of 128 bytes (as for CY8CPROTO_062_4343W)
+ * and a default UART config (9600, 8N1), flushing the Tx FIFO wold take:
+ * (1 start_bit + 8 data_bits + 1 stop_bit) * 128 * 1000 / 9600 = 133.3 ms.
+ * To be on the safe side, set the wait time to 150 ms.
  */
-#define SERIAL_FLUSH_TIME_MS 20
+#define SERIAL_FLUSH_TIME_MS 150
 
 int CASE_INDEX_START;
 int CASE_INDEX_CURRENT;

TESTS/mbed_drivers/watchdog_reset/main.cpp

@@ -61,12 +61,12 @@
  * are empty. However, it is possible to determine the time required for the
  * buffers to flush.
  *
- * Take NUMAKER_PFM_NUC472 as an example:
- * The UART peripheral has 16-byte Tx FIFO. With a baud rate set to 9600,
- * flushing the Tx FIFO would take: 16 * 8 * 1000 / 9600 = 13.3 ms.
- * To be on the safe side, set the wait time to 20 ms.
+ * Assuming the biggest Tx FIFO of 128 bytes (as for CY8CPROTO_062_4343W)
+ * and a default UART config (9600, 8N1), flushing the Tx FIFO wold take:
+ * (1 start_bit + 8 data_bits + 1 stop_bit) * 128 * 1000 / 9600 = 133.3 ms.
+ * To be on the safe side, set the wait time to 150 ms.
  */
-#define SERIAL_FLUSH_TIME_MS 20
+#define SERIAL_FLUSH_TIME_MS 150
 
 #define TIMEOUT_US (1000 * (TIMEOUT_MS))
 #define KICK_ADVANCE_US (1000 * (KICK_ADVANCE_MS))
@@ -112,10 +112,11 @@ void test_simple_reset()
 
     // Phase 1. -- run the test code.
     // Init the watchdog and wait for a device reset.
-    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS) == false) {
+    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS + SERIAL_FLUSH_TIME_MS) == false) {
         TEST_ASSERT_MESSAGE(0, "Dev-host communication error.");
         return;
     }
+    wait_us(SERIAL_FLUSH_TIME_US); // Wait for the serial buffers to flush.
     Watchdog &watchdog = Watchdog::get_instance();
     TEST_ASSERT_FALSE(watchdog.is_running());
     TEST_ASSERT_TRUE(watchdog.start(TIMEOUT_MS));
@@ -141,10 +142,11 @@ void test_sleep_reset()
     }
 
     // Phase 1. -- run the test code.
-    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS) == false) {
+    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS + SERIAL_FLUSH_TIME_MS) == false) {
         TEST_ASSERT_MESSAGE(0, "Dev-host communication error.");
         return;
     }
+    wait_us(SERIAL_FLUSH_TIME_US); // Wait for the serial buffers to flush.
     Watchdog &watchdog = Watchdog::get_instance();
     TEST_ASSERT_FALSE(watchdog.is_running());
     TEST_ASSERT_TRUE(watchdog.start(TIMEOUT_MS));
@@ -232,10 +234,11 @@ void test_restart_reset()
     // The watchdog should trigger before twice the timeout value.
     wait_us(TIMEOUT_US / 2 + TIMEOUT_US);
 
-    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS) == false) {
+    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS + SERIAL_FLUSH_TIME_MS) == false) {
         TEST_ASSERT_MESSAGE(0, "Dev-host communication error.");
         return;
     }
+    wait_us(SERIAL_FLUSH_TIME_US); // Wait for the serial buffers to flush.
     TEST_ASSERT_TRUE(watchdog.start(TIMEOUT_MS));
     TEST_ASSERT_TRUE(watchdog.is_running());
     // Watchdog should fire before twice the timeout value.
@@ -268,10 +271,11 @@ void test_kick_reset()
         wait_us(TIMEOUT_US - KICK_ADVANCE_US);
         watchdog.kick();
     }
-    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS) == false) {
+    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS + SERIAL_FLUSH_TIME_MS) == false) {
         TEST_ASSERT_MESSAGE(0, "Dev-host communication error.");
         return;
     }
+    wait_us(SERIAL_FLUSH_TIME_US); // Wait for the serial buffers to flush.
     // Watchdog should fire before twice the timeout value.
     wait_us(2 * TIMEOUT_US); // Device reset expected.
 

TESTS/mbed_hal/lp_ticker/main.cpp

@@ -47,21 +47,20 @@ ticker_irq_handler_type prev_handler;
 
 #define LP_TICKER_OV_LIMIT 4000
 
-/* Flush serial buffer before deep sleep
+/* To prevent a loss of Greentea data, the serial buffers have to be flushed
+ * before the UART peripheral shutdown. The UART shutdown happens when the
+ * device is entering the deepsleep mode or performing a reset.
  *
- * Since deepsleep() may shut down the UART peripheral, we wait for some time
- * to allow for hardware serial buffers to completely flush.
+ * With the current API, it is not possible to check if the hardware buffers
+ * are empty. However, it is possible to determine the time required for the
+ * buffers to 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 busy_wait_ms() function for now.
+ * Assuming the biggest Tx FIFO of 128 bytes (as for CY8CPROTO_062_4343W)
+ * and a default UART config (9600, 8N1), flushing the Tx FIFO wold take:
+ * (1 start_bit + 8 data_bits + 1 stop_bit) * 128 * 1000 / 9600 = 133.3 ms.
+ * To be on the safe side, set the wait time to 150 ms.
  */
-#define SERIAL_FLUSH_TIME_MS    20
+#define SERIAL_FLUSH_TIME_MS 150
 
 void busy_wait_ms(int ms)
 {

TESTS/mbed_hal/reset_reason/main.cpp

@@ -49,19 +49,20 @@
 #define MSG_KEY_RESET_REASON "reason"
 #define MSG_KEY_DEVICE_RESET "reset"
 
-/* To prevent loss of Greentea data, flush serial buffers before the UART peripheral shutdown. The UART shutdown happens when the
+/* To prevent a loss of Greentea data, the serial buffers have to be flushed
+ * before the UART peripheral shutdown. The UART shutdown happens when the
  * device is entering the deepsleep mode or performing a reset.
  *
  * With the current API, it is not possible to check if the hardware buffers
- * are empty. However, you can determine the amount of time required for the
+ * are empty. However, it is possible to determine the time required for the
  * buffers to flush.
  *
- * For example, NUMAKER_PFM_NUC472:
- * The UART peripheral has 16-byte Tx FIFO. With a baud rate of 9600,
- * flushing the Tx FIFO would take: 16 * 8 * 1000 / 9600 = 13.3 ms.
- * To be on the safe side, set the wait time to 20 ms.
+ * Assuming the biggest Tx FIFO of 128 bytes (as for CY8CPROTO_062_4343W)
+ * and a default UART config (9600, 8N1), flushing the Tx FIFO wold take:
+ * (1 start_bit + 8 data_bits + 1 stop_bit) * 128 * 1000 / 9600 = 133.3 ms.
+ * To be on the safe side, set the wait time to 150 ms.
  */
-#define SERIAL_FLUSH_TIME_MS    20
+#define SERIAL_FLUSH_TIME_MS 150
 
 typedef enum {
     CMD_STATUS_CONTINUE,

TESTS/mbed_hal/sleep/sleep_test_utils.h

@@ -29,21 +29,20 @@
 #include "hal/us_ticker_api.h"
 #include "hal/lp_ticker_api.h"
 
-/* Flush serial buffer before deep sleep
+/* To prevent a loss of Greentea data, the serial buffers have to be flushed
+ * before the UART peripheral shutdown. The UART shutdown happens when the
+ * device is entering the deepsleep mode or performing a reset.
  *
- * Since deepsleep() may shut down the UART peripheral, we wait for some time
- * to allow for hardware serial buffers to completely flush.
+ * With the current API, it is not possible to check if the hardware buffers
+ * are empty. However, it is possible to determine the time required for the
+ * buffers to 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 busy_wait_ms() function for now.
+ * Assuming the biggest Tx FIFO of 128 bytes (as for CY8CPROTO_062_4343W)
+ * and a default UART config (9600, 8N1), flushing the Tx FIFO wold take:
+ * (1 start_bit + 8 data_bits + 1 stop_bit) * 128 * 1000 / 9600 = 133.3 ms.
+ * To be on the safe side, set the wait time to 150 ms.
  */
-#define SERIAL_FLUSH_TIME_MS 20
+#define SERIAL_FLUSH_TIME_MS 150
 
 #define US_PER_S 1000000
 

TESTS/mbed_hal/watchdog/main.cpp

@@ -52,12 +52,12 @@
  * are empty. However, it is possible to determine the time required for the
  * buffers to flush.
  *
- * Take NUMAKER_PFM_NUC472 as an example:
- * The UART peripheral has 16-byte Tx FIFO. With a baud rate set to 9600,
- * flushing the Tx FIFO would take: 16 * 8 * 1000 / 9600 = 13.3 ms.
- * To be on the safe side, set the wait time to 20 ms.
+ * Assuming the biggest Tx FIFO of 128 bytes (as for CY8CPROTO_062_4343W)
+ * and a default UART config (9600, 8N1), flushing the Tx FIFO wold take:
+ * (1 start_bit + 8 data_bits + 1 stop_bit) * 128 * 1000 / 9600 = 133.3 ms.
+ * To be on the safe side, set the wait time to 150 ms.
  */
-#define SERIAL_FLUSH_TIME_MS    20
+#define SERIAL_FLUSH_TIME_MS 150
 
 int CASE_INDEX_START;
 int CASE_INDEX_CURRENT;

TESTS/mbed_hal/watchdog_reset/main.cpp

@@ -61,12 +61,12 @@
  * are empty. However, it is possible to determine the time required for the
  * buffers to flush.
  *
- * Take NUMAKER_PFM_NUC472 as an example:
- * The UART peripheral has 16-byte Tx FIFO. With a baud rate set to 9600,
- * flushing the Tx FIFO would take: 16 * 8 * 1000 / 9600 = 13.3 ms.
- * To be on the safe side, set the wait time to 20 ms.
+ * Assuming the biggest Tx FIFO of 128 bytes (as for CY8CPROTO_062_4343W)
+ * and a default UART config (9600, 8N1), flushing the Tx FIFO wold take:
+ * (1 start_bit + 8 data_bits + 1 stop_bit) * 128 * 1000 / 9600 = 133.3 ms.
+ * To be on the safe side, set the wait time to 150 ms.
  */
-#define SERIAL_FLUSH_TIME_MS 20
+#define SERIAL_FLUSH_TIME_MS 150
 
 #define TIMEOUT_US (1000 * (TIMEOUT_MS))
 #define KICK_ADVANCE_US (1000 * (KICK_ADVANCE_MS))
@@ -111,10 +111,11 @@ void test_simple_reset()
     // Phase 1. -- run the test code.
     // Init the watchdog and wait for a device reset.
     watchdog_config_t config = { TIMEOUT_MS };
-    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS) == false) {
+    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS + SERIAL_FLUSH_TIME_MS) == false) {
         TEST_ASSERT_MESSAGE(0, "Dev-host communication error.");
         return;
     }
+    wait_us(SERIAL_FLUSH_TIME_US); // Wait for the serial buffers to flush.
     TEST_ASSERT_EQUAL(WATCHDOG_STATUS_OK, hal_watchdog_init(&config));
     // Watchdog should fire before twice the timeout value.
     wait_us(2 * TIMEOUT_US); // Device reset expected.
@@ -138,10 +139,11 @@ void test_sleep_reset()
 
     // Phase 1. -- run the test code.
     watchdog_config_t config = { TIMEOUT_MS };
-    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS) == false) {
+    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS + SERIAL_FLUSH_TIME_MS) == false) {
         TEST_ASSERT_MESSAGE(0, "Dev-host communication error.");
         return;
     }
+    wait_us(SERIAL_FLUSH_TIME_US); // Wait for the serial buffers to flush.
     TEST_ASSERT_EQUAL(WATCHDOG_STATUS_OK, hal_watchdog_init(&config));
     sleep_manager_lock_deep_sleep();
     if (sleep_manager_can_deep_sleep()) {
@@ -176,6 +178,7 @@ void test_deepsleep_reset()
         return;
     }
     wait_us(SERIAL_FLUSH_TIME_US); // Wait for the serial buffers to flush.
+    wait_us(SERIAL_FLUSH_TIME_US); // Wait for the serial buffers to flush.
     TEST_ASSERT_EQUAL(WATCHDOG_STATUS_OK, hal_watchdog_init(&config));
     if (!sleep_manager_can_deep_sleep()) {
         TEST_ASSERT_MESSAGE(0, "Deepsleep should be allowed.");
@@ -221,10 +224,11 @@ void test_restart_reset()
     // The watchdog should trigger before twice the timeout value.
     wait_us(TIMEOUT_US / 2 + TIMEOUT_US);
 
-    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS) == false) {
+    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS + SERIAL_FLUSH_TIME_MS) == false) {
         TEST_ASSERT_MESSAGE(0, "Dev-host communication error.");
         return;
     }
+    wait_us(SERIAL_FLUSH_TIME_US); // Wait for the serial buffers to flush.
     TEST_ASSERT_EQUAL(WATCHDOG_STATUS_OK, hal_watchdog_init(&config));
     // Watchdog should fire before twice the timeout value.
     wait_us(2 * TIMEOUT_US); // Device reset expected.
@@ -254,10 +258,11 @@ void test_kick_reset()
         wait_us(TIMEOUT_US - KICK_ADVANCE_US);
         hal_watchdog_kick();
     }
-    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS) == false) {
+    if (send_reset_notification(&current_case, 2 * TIMEOUT_MS + SERIAL_FLUSH_TIME_MS) == false) {
         TEST_ASSERT_MESSAGE(0, "Dev-host communication error.");
         return;
     }
+    wait_us(SERIAL_FLUSH_TIME_US); // Wait for the serial buffers to flush.
     // Watchdog should fire before twice the timeout value.
     wait_us(2 * TIMEOUT_US); // Device reset expected.