mirror of https://github.com/ARMmbed/mbed-os.git
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/* Copyright (c) 2017-2019 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @section DESCRIPTION
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*
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* LPC1768 Watchdog
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*
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*/
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#ifdef DEVICE_WATCHDOG
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#include "watchdog_api.h"
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#include "reset_reason_api.h"
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#include "device.h"
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#include "mbed_error.h"
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#include <stdbool.h>
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watchdog_status_t hal_watchdog_init(const watchdog_config_t *config)
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{
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LPC_WDT->WDCLKSEL = 0x1; //CLK src to PCLK
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uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4
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LPC_WDT->WDTC = ((float)config->timeout_ms )* clk/1000;
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LPC_WDT->WDMOD = 0x3; // Enable and Reset
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hal_watchdog_kick();
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return WATCHDOG_STATUS_OK;
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}
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void hal_watchdog_kick(void)
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{
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LPC_WDT->WDFEED = 0xAA;
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LPC_WDT->WDFEED = 0x55;
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}
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watchdog_status_t hal_watchdog_stop(void)
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{
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return WATCHDOG_STATUS_NOT_SUPPORTED;
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}
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uint32_t hal_watchdog_get_reload_value(void)
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{
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uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4
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return (float)LPC_WDT->WDTC/clk*1000;
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}
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watchdog_features_t hal_watchdog_get_platform_features(void)
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{
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uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4
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watchdog_features_t features;
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features.max_timeout = ((float)INT32_MAX/clk)*1000;
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features.update_config = true;
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features.disable_watchdog = false;
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features.clock_typical_frequency = 4000000;
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features.clock_max_frequency = 4040000;
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return features;
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}
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#endif // DEVICE_WATCHDOG
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