| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 <xc.h> |
| #include "hal/hal_watchdog.h" |
| |
| int |
| hal_watchdog_init(uint32_t expire_msecs) |
| { |
| /* |
| * Cannot change watchdog prescaler at runtime. |
| * Only check if the watchdog timer is greater than expire_msecs. |
| */ |
| uint32_t wdt_period = 1; |
| wdt_period <<= (WDTCON & _WDTCON_RUNDIV_MASK) >> _WDTCON_RUNDIV_POSITION; |
| |
| return wdt_period < expire_msecs ? -1 : 0; |
| } |
| |
| void |
| hal_watchdog_enable(void) |
| { |
| WDTCONSET = _WDTCON_ON_MASK; |
| } |
| |
| void |
| hal_watchdog_tickle(void) |
| { |
| volatile uint16_t *wdtclrkey = (volatile uint16_t*)&WDTCON + 1; |
| *wdtclrkey = 0x5743; |
| } |
