[nrf fromlist] samples: boards: nordic: system_off fixes

For reasons other than system off, the retained data should be cleared.

Upstream PR #: 89044

Signed-off-by: Adam Kondraciuk <[email protected]>

Author: adamkondraciuk

samples/boards/nordic/system_off/sample.yaml

@@ -42,7 +42,7 @@ tests:
       ordered: true
       regex:
         - "system off demo"
-        - "Retained data: INVALID"
+        - "Retained data: VALID"
         - "Boot count: 1"
         - "Off count: 0"
         - "Active Ticks:"
@@ -87,7 +87,7 @@ tests:
       ordered: true
       regex:
         - "system off demo"
-        - "Retained data: INVALID"
+        - "Retained data: VALID"
         - "Boot count: 1"
         - "Off count: 0"
         - "Active Ticks:"
@@ -140,7 +140,7 @@ tests:
       ordered: true
       regex:
         - "system off demo"
-        - "Retained data: INVALID"
+        - "Retained data: VALID"
         - "Boot count: 1"
         - "Off count: 0"
         - "Active Ticks:"

samples/boards/nordic/system_off/src/main.c

@@ -29,15 +29,14 @@ static const struct gpio_dt_spec sw0 = GPIO_DT_SPEC_GET(DT_ALIAS(sw0), gpios);
 static const struct device *comp_dev = DEVICE_DT_GET(DT_NODELABEL(comp));
 #endif
 
-void print_reset_cause(void)
+void print_reset_cause(uint32_t reset_cause)
 {
-	uint32_t reset_cause;
-
-	hwinfo_get_reset_cause(&reset_cause);
 	if (reset_cause & RESET_DEBUG) {
 		printf("Reset by debugger.\n");
 	} else if (reset_cause & RESET_CLOCK) {
 		printf("Wakeup from System OFF by GRTC.\n");
+	} else if (reset_cause & RESET_LOW_POWER_WAKE) {
+		printf("Wakeup from System OFF by GPIO.\n");
 	} else  {
 		printf("Other wake up cause 0x%08X.\n", reset_cause);
 	}
@@ -46,6 +45,7 @@ void print_reset_cause(void)
 int main(void)
 {
 	int rc;
+	uint32_t reset_cause;
 	const struct device *const cons = DEVICE_DT_GET(DT_CHOSEN(zephyr_console));
 
 	if (!device_is_ready(cons)) {
@@ -54,11 +54,19 @@ int main(void)
 	}
 
 	printf("\n%s system off demo\n", CONFIG_BOARD);
-	print_reset_cause();
+	hwinfo_get_reset_cause(&reset_cause);
+	print_reset_cause(reset_cause);
 
 	if (IS_ENABLED(CONFIG_APP_USE_RETAINED_MEM)) {
 		bool retained_ok = retained_validate();
 
+		if (!(reset_cause & (RESET_CLOCK | RESET_LOW_POWER_WAKE))) {
+			retained.boots = 0;
+			retained.off_count = 0;
+			retained.uptime_sum = 0;
+			retained.uptime_latest = 0;
+			retained_ok = true;
+		}
 		/* Increment for this boot attempt and update. */
 		retained.boots += 1;
 		retained_update();