[zigbee sample] Introduce watchdog for sensor task

code/nrf-connect/samples/zigbee/CMakeLists.txt

@@ -19,6 +19,7 @@ target_sources(app PRIVATE
   src/prst_zb_attrs.c
   src/prst_zb_soil_moisture_defs.c
   src/restart_handler.c
+  src/watchdog.c
 )
 
 add_subdirectory(../../prstlib prstlib)

code/nrf-connect/samples/zigbee/prj.conf

@@ -60,6 +60,10 @@ CONFIG_FLASH_PAGE_LAYOUT=y
 CONFIG_FILE_SYSTEM=y
 CONFIG_FILE_SYSTEM_LITTLEFS=y
 
+CONFIG_WATCHDOG=y
+CONFIG_HWINFO=y
+CONFIG_ASSERT=y
+
 # Uncomment for debug log level.
 # CONFIG_LOG_DEFAULT_LEVEL=4
 

code/nrf-connect/samples/zigbee/src/main.c

@@ -10,6 +10,7 @@
 #include <zboss_api.h>
 #include <zboss_api_addons.h>
 #include <zcl/zb_zcl_power_config.h>
+#include <zephyr/drivers/hwinfo.h>
 #include <zephyr/kernel.h>
 #include <zephyr/logging/log.h>
 #include <zigbee/zigbee_app_utils.h>
@@ -22,6 +23,7 @@
 #include "prst_zb_endpoint_defs.h"
 #include "prst_zb_soil_moisture_defs.h"
 #include "restart_handler.h"
+#include "watchdog.h"
 
 LOG_MODULE_REGISTER(app, CONFIG_LOG_DEFAULT_LEVEL);
 
@@ -135,6 +137,8 @@ void update_sensors_cb(zb_uint8_t arg) {
     zb_reset(0);
   }
 
+  __ASSERT(!prst_watchdog_feed(), "Failed to feed watchdog");
+
   prst_debug_counters_increment("sensors_read_before");
   if (prst_sensors_read_all(&sensors)) {
     prst_debug_counters_increment("sensors_read_error");
@@ -227,9 +231,10 @@ void zboss_signal_handler(zb_bufid_t bufid) {
       k_timer_start(&led_flashing_timer, K_NO_WAIT, K_SECONDS(1));
 
       // Kick off main sensor update task.
-      ZB_SCHEDULE_APP_ALARM(update_sensors_cb,
+      ZB_ERROR_CHECK(ZB_SCHEDULE_APP_ALARM(update_sensors_cb,
                                            /*param=*/0,
-                            ZB_MILLISECONDS_TO_BEACON_INTERVAL(1000));
+                                           ZB_MILLISECONDS_TO_BEACON_INTERVAL(1000)));
+      __ASSERT_NO_MSG(!prst_watchdog_start());
       break;
     }
     case ZB_NLME_STATUS_INDICATION: {
@@ -255,10 +260,40 @@ void zboss_signal_handler(zb_bufid_t bufid) {
   }
 }
 
-void log_counter(const char *counter_name, prst_debug_counter_t value) {
+void dump_counter(const char *counter_name, prst_debug_counter_t value) {
   LOG_INF("- %s: %d", counter_name, value);
 }
 
+int log_reset_reason_counter() {
+  uint32_t cause;
+  const char *reset_counter_str = "reset_cause_unknown";
+  RET_IF_ERR(hwinfo_get_reset_cause(&cause));
+  RET_IF_ERR(hwinfo_clear_reset_cause());
+  if (cause & RESET_PIN) {
+    reset_counter_str = "reset_cause_pin";
+  } else if (cause & RESET_SOFTWARE) {
+    // Includes fatal errors from __ASSERT, ZB_ERROR_CHECK and friends.
+    reset_counter_str = "reset_cause_software";
+  } else if (cause & RESET_BROWNOUT) {
+    reset_counter_str = "reset_cause_brownout";
+  } else if (cause & RESET_POR) {
+    reset_counter_str = "reset_cause_power_on";
+  } else if (cause & RESET_WATCHDOG) {
+    reset_counter_str = "reset_cause_watchdog";
+  } else if (cause & RESET_DEBUG) {
+    reset_counter_str = "reset_cause_debug";
+  } else if (cause & RESET_LOW_POWER_WAKE) {
+    reset_counter_str = "reset_cause_low_power";
+  } else if (cause & RESET_CPU_LOCKUP) {
+    reset_counter_str = "reset_cause_cpu_lockup";
+  } else if (cause & RESET_HARDWARE) {
+    reset_counter_str = "reset_cause_hardware";
+  } else if (cause & RESET_USER) {
+    reset_counter_str = "reset_cause_user";
+  }
+  return prst_debug_counters_increment(reset_counter_str);
+}
+
 int main(void) {
   RET_IF_ERR(prst_adc_init());
   RET_IF_ERR(prst_led_init());
@@ -267,20 +302,22 @@ int main(void) {
   RET_IF_ERR(prst_debug_counters_init());
 
   // Initialize sensors - quickly put them into low power mode.
-  RET_IF_ERR(prst_sensors_read_all(&sensors));
+  __ASSERT_NO_MSG(!prst_sensors_read_all(&sensors));
 
   prst_debug_counters_increment("boot");
 
-  LOG_INF("Dumping debug counters:");
-  prst_debug_counters_get_all(log_counter);
+  log_reset_reason_counter();
 
-  RET_IF_ERR(prst_zb_factory_reset_check());
+  LOG_INF("Dumping debug counters:");
+  prst_debug_counters_get_all(dump_counter);
+
+  __ASSERT_NO_MSG(!prst_zb_factory_reset_check());
 
   prst_zb_attrs_init(&dev_ctx);
 
   ZB_AF_REGISTER_DEVICE_CTX(&app_template_ctx);
 
-  RET_IF_ERR(prst_led_flash(2));
+  prst_led_flash(2);
   k_msleep(100);
 
   ZB_AF_SET_IDENTIFY_NOTIFICATION_HANDLER(PRST_ZIGBEE_ENDPOINT, identify_cb);

code/nrf-connect/samples/zigbee/src/watchdog.c

@@ -0,0 +1,47 @@
+#include "watchdog.h"
+
+#include <prstlib/macros.h>
+#include <zephyr/device.h>
+#include <zephyr/drivers/watchdog.h>
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+
+#define PRST_ZB_WATCHDOG_TIMEOUT_SEC (2 * CONFIG_PRST_ZB_SLEEP_DURATION_SEC)
+
+LOG_MODULE_REGISTER(watchdog, CONFIG_LOG_DEFAULT_LEVEL);
+
+typedef struct {
+  const struct device *const wdt;
+  int wtd_channel_id;
+} wtd_data_t;
+
+static wtd_data_t wtd_data = {
+    .wdt = DEVICE_DT_GET(DT_NODELABEL(wdt)),
+};
+
+int prst_watchdog_start() {
+  static const struct wdt_timeout_cfg wdt_settings = {
+      .window = {
+          .min = 0,
+          .max = PRST_ZB_WATCHDOG_TIMEOUT_SEC * MSEC_PER_SEC,
+      },
+      // NULL callback means use the default, which is the system reset.
+      .callback = NULL,
+      .flags = WDT_FLAG_RESET_SOC};
+
+  RET_IF_ERR(!device_is_ready(wtd_data.wdt));
+
+  // Install timeout.
+  wtd_data.wtd_channel_id = wdt_install_timeout(wtd_data.wdt, &wdt_settings);
+  RET_CHECK(wtd_data.wtd_channel_id >= 0, "Failed to install watchdog timeout.");
+
+  // Start watchdog.
+  RET_IF_ERR(wdt_setup(wtd_data.wdt, WDT_OPT_PAUSE_HALTED_BY_DBG));
+
+  return 0;
+}
+
+int prst_watchdog_feed() {
+  RET_IF_ERR(wdt_feed(wtd_data.wdt, wtd_data.wtd_channel_id));
+  return 0;
+}

code/nrf-connect/samples/zigbee/src/watchdog.h

@@ -0,0 +1,8 @@
+#ifndef _PRST_ZB_WATCHDOG_H_
+#define _PRST_ZB_WATCHDOG_H_
+
+int prst_watchdog_start();
+
+int prst_watchdog_feed();
+
+#endif  // _PRST_ZB_WATCHDOG_H_