tests-mbed_hal-rtc_reset: Add ack from the device after each command is executed

RTC reset test was failing when board has been just powered and RTC reset test was executed for the first time (issue has been detected on CI). In such case RTC initialization takes more time than in futher rtc_init calls. This has impact on green-tea communication. Commands send by host immediately after init command (write, read) were not handled on the device side and no response to the host was provided.
To fix this problem test communication flow has been modified. Device sends ack to the host after RTC init is done. Host sends further RTC commands when ack from the device has been received.

Edit:
There are still some communication issues on the CI. Add ack from the device after each executed command. Increase test timeout and wait after reset.

TESTS/host_tests/rtc_reset.py

@@ -32,7 +32,7 @@ class RtcResetTest(BaseHostTest):
     START_TIME = 50000
     START_TIME_TOLERANCE = 10
     """Time to delay after sending reset"""
-    DELAY_TIME = 4.0
+    DELAY_TIME = 5.0
     DELAY_TOLERANCE = 1.0
     VALUE_PLACEHOLDER = "0"
 
@@ -47,12 +47,11 @@ class RtcResetTest(BaseHostTest):
             if self._error:
                 return
             try:
-                print("Calling generator")
                 generator.send((key, value, time))
             except StopIteration:
                 self._error = True
 
-        for resp in ("start", "read"):
+        for resp in ("start", "read", "ack"):
             self.register_callback(resp, run_gen)
 
     def teardown(self):
@@ -75,7 +74,19 @@ class RtcResetTest(BaseHostTest):
 
         # Initialize, and set the time
         self.send_kv("init", self.VALUE_PLACEHOLDER)
+        
+        # Wait for ack from the device
+        key, value, time = yield
+        if key != "ack":
+            return
+        
         self.send_kv("write", str(self.START_TIME))
+        
+        # Wait for ack from the device
+        key, value, time = yield
+        if key != "ack":
+            return
+        
         self.send_kv("read", self.VALUE_PLACEHOLDER)
         key, value, time = yield
         if key != "read":
@@ -84,7 +95,15 @@ class RtcResetTest(BaseHostTest):
 
         # Unitialize, and reset
         self.send_kv("free", self.VALUE_PLACEHOLDER)
+        
+        # Wait for ack from the device
+        key, value, time = yield
+        if key != "ack":
+            return
+        
         self.send_kv("reset", self.VALUE_PLACEHOLDER)
+        
+        # No ack after reset
         sleep(self.DELAY_TIME)
 
         # Restart the test, and send the sync token
@@ -95,6 +114,12 @@ class RtcResetTest(BaseHostTest):
 
         # Initialize, and read the time
         self.send_kv("init", self.VALUE_PLACEHOLDER)
+        
+        # Wait for ack from the device
+        key, value, time = yield
+        if key != "ack":
+            return
+        
         self.send_kv("read", self.VALUE_PLACEHOLDER)
         key, value, time = yield
         if key != "read":

TESTS/mbed_hal/rtc_reset/main.cpp

@@ -38,10 +38,12 @@ static cmd_status_t handle_command(const char *key, const char *value)
 {
     if (strcmp(key, "init") == 0) {
         rtc_init();
+        greentea_send_kv("ack", 0);
         return CMD_STATUS_CONTINUE;
 
     } else if (strcmp(key, "free") == 0) {
         rtc_free();
+        greentea_send_kv("ack", 0);
         return CMD_STATUS_CONTINUE;
 
     } else if (strcmp(key, "read") == 0) {
@@ -55,6 +57,7 @@ static cmd_status_t handle_command(const char *key, const char *value)
         uint32_t time;
         sscanf(value, "%lu", &time);
         rtc_write(time);
+        greentea_send_kv("ack", 0);
         return CMD_STATUS_CONTINUE;
 
     } else if (strcmp(key, "reset") == 0) {
@@ -74,7 +77,7 @@ static cmd_status_t handle_command(const char *key, const char *value)
 /* Test that software reset doesn't stop RTC from counting. */
 void rtc_reset_test()
 {
-    GREENTEA_SETUP(60, "rtc_reset");
+    GREENTEA_SETUP(100, "rtc_reset");
 
     static char _key[10 + 1] = {};
     static char _value[128 + 1] = {};