Add support for watchdog on Silicon Labs devices

targets/TARGET_Silicon_Labs/TARGET_EFM32/watchdog_api.c

@@ -0,0 +1,100 @@
+/***************************************************************************//**
+ * @file watchdog_api.c
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2018 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************************/
+
+#include "device.h"
+#include "watchdog_api.h"
+
+#if DEVICE_WATCHDOG
+
+#include "clocking.h"
+#include "em_cmu.h"
+#include "em_wdog.h"
+
+watchdog_status_t hal_watchdog_init(const watchdog_config_t *config)
+{
+    if (config == 0 || config->timeout_ms > 262145 || config->timeout_ms == 0) {
+        return WATCHDOG_STATUS_INVALID_ARGUMENT;
+    }
+
+    uint32_t timeout = config->timeout_ms;
+    if (timeout <= 9) {
+        timeout = 0;
+    } else {
+        timeout -= 2;
+        /* get bit position of highest bit set */
+        timeout = 31 - __CLZ(timeout);
+        /* need to go one over */
+        timeout += 1;
+        /* convert to wdog setting. if bit 4 is the highest, then the
+         * watchdog setting == 1. That means watchdog setting 0xF == 2^18 = 256k */
+        if (timeout > 18) {
+            return WATCHDOG_STATUS_INVALID_ARGUMENT;
+        }
+
+        timeout -= 3;
+    }
+
+    WDOG_Init_TypeDef wdog_init = WDOG_INIT_DEFAULT;
+    wdog_init.clkSel = wdogClkSelULFRCO;
+    wdog_init.em2Run = true;
+    wdog_init.em3Run = true;
+    wdog_init.perSel = timeout;
+
+    WDOGn_Init(DEFAULT_WDOG, &wdog_init);
+
+    return WATCHDOG_STATUS_OK;
+}
+
+void hal_watchdog_kick(void)
+{
+    WDOGn_Feed(DEFAULT_WDOG);
+}
+
+watchdog_status_t hal_watchdog_stop(void)
+{
+    WDOGn_Enable(DEFAULT_WDOG, false);
+    return WATCHDOG_STATUS_OK;
+}
+
+uint32_t hal_watchdog_get_reload_value(void)
+{
+    uint32_t period = (DEFAULT_WDOG->CTRL & _WDOG_CTRL_PERSEL_MASK) >> _WDOG_CTRL_PERSEL_SHIFT;
+    if (period == 0) {
+        return 9;
+    } else {
+        period += 3;
+        return (1U << period) + 1;
+    }
+}
+
+watchdog_features_t hal_watchdog_get_platform_features(void)
+{
+    watchdog_features_t feat = {
+        .max_timeout = 262145,
+        .update_config = true,
+        .disable_watchdog = true
+    };
+    return feat;
+}
+
+#endif /* DEVICE_WATCHDOG */

targets/targets.json

@@ -5814,7 +5814,8 @@
             "USTICKER",
             "FLASH",
             "ITM",
-            "MPU"
+            "MPU",
+            "WATCHDOG"
         ],
         "forced_reset_timeout": 2,
         "config": {
@@ -5890,7 +5891,8 @@
             "STDIO_MESSAGES",
             "USTICKER",
             "FLASH",
-            "MPU"
+            "MPU",
+            "WATCHDOG"
         ],
         "forced_reset_timeout": 2,
         "device_name": "EFM32LG990F256",
@@ -5968,7 +5970,8 @@
             "STDIO_MESSAGES",
             "USTICKER",
             "FLASH",
-            "MPU"
+            "MPU",
+            "WATCHDOG"
         ],
         "forced_reset_timeout": 2,
         "config": {
@@ -6041,7 +6044,8 @@
             "SPISLAVE",
             "SPI_ASYNCH",
             "STDIO_MESSAGES",
-            "USTICKER"
+            "USTICKER",
+            "WATCHDOG"
         ],
         "forced_reset_timeout": 2,
         "config": {
@@ -6114,7 +6118,8 @@
             "SPISLAVE",
             "SPI_ASYNCH",
             "STDIO_MESSAGES",
-            "USTICKER"
+            "USTICKER",
+            "WATCHDOG"
         ],
         "forced_reset_timeout": 2,
         "config": {
@@ -6190,7 +6195,8 @@
             "STDIO_MESSAGES",
             "USTICKER",
             "FLASH",
-            "MPU"
+            "MPU",
+            "WATCHDOG"
         ],
         "forced_reset_timeout": 2,
         "config": {
@@ -6289,7 +6295,8 @@
             "STDIO_MESSAGES",
             "USTICKER",
             "FLASH",
-            "MPU"
+            "MPU",
+            "WATCHDOG"
         ],
         "forced_reset_timeout": 2,
         "config": {
@@ -6359,7 +6366,8 @@
             "STDIO_MESSAGES",
             "USTICKER",
             "FLASH",
-            "MPU"
+            "MPU",
+            "WATCHDOG"
         ],
         "forced_reset_timeout": 5,
         "config": {
@@ -6437,7 +6445,8 @@
             "USTICKER",
             "TRNG",
             "FLASH",
-            "MPU"
+            "MPU",
+            "WATCHDOG"
         ],
         "forced_reset_timeout": 2,
         "config": {
@@ -6525,7 +6534,8 @@
             "USTICKER",
             "TRNG",
             "FLASH",
-            "MPU"
+            "MPU",
+            "WATCHDOG"
         ],
         "forced_reset_timeout": 5,
         "config": {