Support for Teensy 4 (#19311)

Marlin/src/HAL/TEENSY40_41/watchdog.cpp

@@ -0,0 +1,52 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#ifdef __IMXRT1062__
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(USE_WATCHDOG)
+
+#include "watchdog.h"
+
+// 4 seconds timeout
+#define WDTO 4 //seconds
+
+uint8_t timeoutval = (WDTO - 0.5f) / 0.5f;
+
+void watchdog_init() {
+
+  CCM_CCGR3 |= CCM_CCGR3_WDOG1(3);  // enable WDOG1 clocks
+  WDOG1_WMCR = 0;                   // disable power down PDE
+  WDOG1_WCR |= WDOG_WCR_SRS | WDOG_WCR_WT(timeoutval);
+  WDOG1_WCR |= WDOG_WCR_WDE | WDOG_WCR_WDT | WDOG_WCR_SRE;
+
+}
+
+void HAL_watchdog_refresh() {
+  // Watchdog refresh sequence
+  WDOG1_WSR = 0x5555;
+  WDOG1_WSR = 0xAAAA;
+}
+
+#endif // USE_WATCHDOG
+
+#endif // __IMXRT1062__