初始版本

components/libraries/bootloader/nrf_bootloader_wdt.c

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+/**
+ * Copyright (c) 2017 - 2020, Nordic Semiconductor ASA
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form, except as embedded into a Nordic
+ *    Semiconductor ASA integrated circuit in a product or a software update for
+ *    such product, must reproduce the above copyright notice, this list of
+ *    conditions and the following disclaimer in the documentation and/or other
+ *    materials provided with the distribution.
+ *
+ * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * 4. This software, with or without modification, must only be used with a
+ *    Nordic Semiconductor ASA integrated circuit.
+ *
+ * 5. Any software provided in binary form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ *
+ * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#include "nrf_bootloader_wdt.h"
+#include "nrf_wdt.h"
+#include "nrf_bootloader_dfu_timers.h"
+#include "nrf_log_ctrl.h"
+
+#define NRF_LOG_MODULE_NAME nrf_bootloader_wdt
+#include "nrf_log.h"
+NRF_LOG_MODULE_REGISTER();
+
+
+static void wdt_feed(void)
+{
+    if (nrf_wdt_started())
+    {
+        for (nrf_wdt_rr_register_t i = NRF_WDT_RR0; i < NRF_WDT_RR7; i++)
+        {
+            if (nrf_wdt_reload_request_is_enabled(i))
+            {
+                nrf_wdt_reload_request_set(i);
+            }
+        }
+    }
+}
+
+
+static void wdt_feed_timer_handler(void)
+{
+    NRF_LOG_INFO("Internal feed");
+    wdt_feed();
+}
+
+
+void WDT_IRQHandler(void)
+{
+    nrf_wdt_event_clear(NRF_WDT_EVENT_TIMEOUT);
+    NRF_LOG_FINAL_FLUSH();
+}
+
+#define MAX_FLASH_OP_TIME_TICKS 3200 // ~100 ms
+
+void nrf_bootloader_wdt_init(void)
+{
+    static bool initialized = false;
+
+    if (initialized)
+    {
+        return;
+    }
+
+    if (nrf_wdt_started())
+    {
+        uint32_t wdt_ticks = nrf_wdt_reload_value_get();
+
+        NRF_LOG_INFO("WDT enabled CRV:%d ticks", wdt_ticks);
+
+        //wdt_ticks must be reduced to feed the watchdog before the timeout.
+        uint32_t reduced_timeout_ticks = MAX((int32_t)wdt_ticks - MAX_FLASH_OP_TIME_TICKS,
+                                             NRF_BOOTLOADER_MIN_TIMEOUT_TICKS);
+
+        /* initial watchdog feed */
+        wdt_feed();
+
+        NRF_LOG_INFO("Starting a timer (%d ticks) for feeding watchdog.", reduced_timeout_ticks);
+        nrf_bootloader_wdt_feed_timer_start(reduced_timeout_ticks, wdt_feed_timer_handler);
+
+        NVIC_EnableIRQ(WDT_IRQn);
+    }
+    else
+    {
+        NRF_LOG_INFO("WDT is not enabled");
+    }
+
+    initialized = true;
+}
+
+void nrf_bootloader_wdt_feed(void)
+{
+    if (nrf_wdt_started())
+    {
+        wdt_feed();
+    }
+}