From 3061ecca3d0fdfb87dabbf5f63c9e06c2a30f53a Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Thu, 23 Aug 2018 17:08:59 +0200
Subject: o Initial import.

---
 .../libraries/bootloader/nrf_bootloader_wdt.c      | 134 +++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/bootloader/nrf_bootloader_wdt.c

(limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/bootloader/nrf_bootloader_wdt.c')

diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/bootloader/nrf_bootloader_wdt.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/bootloader/nrf_bootloader_wdt.c
new file mode 100644
index 0000000..b75d6ef
--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/bootloader/nrf_bootloader_wdt.c
@@ -0,0 +1,134 @@
+/**
+ * Copyright (c) 2017 - 2018, 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();
+
+//Flag used to determine if internal feeding should stay active.
+static bool m_wdt_keep_internal_feed;
+
+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)
+{
+    if (m_wdt_keep_internal_feed)
+    {
+        NRF_LOG_INFO("Internal feed");
+        wdt_feed();
+    }
+}
+
+
+void WDT_IRQHandler(void)
+{
+    nrf_wdt_event_clear(NRF_WDT_EVENT_TIMEOUT);
+    NRF_LOG_FINAL_FLUSH();
+}
+
+void nrf_bootloader_wdt_init(void)
+{
+    static bool initialized = false;
+
+    if (initialized)
+    {
+        return;
+    }
+
+    if (nrf_wdt_started())
+    {
+        uint32_t approx_wdt_ms = nrf_wdt_reload_value_get() / 32;
+
+        NRF_LOG_INFO("WDT enabled CRV:%d ms", approx_wdt_ms);
+
+        //wdt_ticks must be reduced (0.75) to feed the watchdog before the timeout.
+        uint32_t reduced_timeout_ms = (approx_wdt_ms * 3)/4;
+
+        /* Ideally, watchdog should be fed by the bootloader from the main context but if bootloader latency
+         * (mainly driven by signature check) is big enough there is a risk that watchdog will not be fed
+         * on time. In that case watchdog will be fed from timer context. */
+        m_wdt_keep_internal_feed =
+            (reduced_timeout_ms < NRF_BL_WDT_MAX_SCHEDULER_LATENCY_MS);
+
+        /* initial watchdog feed */
+        wdt_feed();
+
+        /* If internal feed is needed or WDT is active in sleep module must provide regular wakeup interrupt.*/
+        bool wdt_start_timer = m_wdt_keep_internal_feed || (NRF_WDT->CONFIG & WDT_CONFIG_SLEEP_Msk);
+        if (wdt_start_timer)
+        {
+            NRF_LOG_INFO("Starting a timer (%d ms) for feeding watchdog.", reduced_timeout_ms);
+            nrf_bootloader_wdt_feed_timer_start(reduced_timeout_ms, 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();
+    }
+}
-- 
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