125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
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/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2020-01-22 shelton first version
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*/
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#include <board.h>
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#include <drivers/watchdog.h>
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#ifdef RT_USING_WDT
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#define LSI_VALUE 40000
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//#define DRV_DEBUG
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#define LOG_TAG "drv.wdt"
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#include <drv_log.h>
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struct at32_wdt_obj
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{
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IWDG_Type *instance;
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rt_uint32_t Prescaler;
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rt_uint32_t Reload;
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rt_uint16_t is_start;
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};
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static struct at32_wdt_obj at32_wdt;
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static struct rt_watchdog_ops ops;
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static rt_watchdog_t watchdog;
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static rt_err_t wdt_init(rt_watchdog_t *wdt)
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{
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return RT_EOK;
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}
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static rt_err_t wdt_control(rt_watchdog_t *wdt, int cmd, void *arg)
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{
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switch (cmd)
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{
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/* feed the watchdog */
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case RT_DEVICE_CTRL_WDT_KEEPALIVE:
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IWDG_ReloadCounter();
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break;
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/* set watchdog timeout */
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case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
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#if defined(LSI_VALUE)
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if(LSI_VALUE)
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{
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at32_wdt.Reload = (*((rt_uint32_t*)arg)) * LSI_VALUE / 256 ;
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}
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else
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{
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LOG_E("Please define the value of LSI_VALUE!");
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}
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if(at32_wdt.Reload > 0xFFF)
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{
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LOG_E("wdg set timeout parameter too large, please less than %ds",0xFFF * 256 / LSI_VALUE);
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return -RT_EINVAL;
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}
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#else
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#error "Please define the value of LSI_VALUE!"
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#endif
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if(at32_wdt.is_start)
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{
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IWDG_KeyRegWrite(IWDG_KeyRegWrite_Enable);
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IWDG_SetPrescaler(at32_wdt.Prescaler);
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IWDG_SetReload(at32_wdt.Reload);
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IWDG_KeyRegWrite(IWDG_KeyRegWrite_Disable);
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IWDG_Enable();
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}
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break;
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case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
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#if defined(LSI_VALUE)
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if(LSI_VALUE)
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{
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(*((rt_uint32_t*)arg)) = at32_wdt.Reload * 256 / LSI_VALUE;
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}
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else
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{
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LOG_E("Please define the value of LSI_VALUE!");
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}
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#else
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#error "Please define the value of LSI_VALUE!"
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#endif
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break;
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case RT_DEVICE_CTRL_WDT_START:
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IWDG_KeyRegWrite(IWDG_KeyRegWrite_Enable);
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IWDG_SetPrescaler(at32_wdt.Prescaler);
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IWDG_SetReload(at32_wdt.Reload);
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IWDG_KeyRegWrite(IWDG_KeyRegWrite_Disable);
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IWDG_Enable();
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at32_wdt.is_start = 1;
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break;
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default:
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LOG_W("This command is not supported.");
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return -RT_ERROR;
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}
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return RT_EOK;
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}
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int rt_hw_wdt_init(void)
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{
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at32_wdt.instance = IWDG;
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at32_wdt.Prescaler = IWDG_Psc_256;
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at32_wdt.Reload = 0x00000FFF;
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at32_wdt.is_start = 0;
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ops.init = &wdt_init;
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ops.control = &wdt_control;
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watchdog.ops = &ops;
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/* register watchdog device */
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if (rt_hw_watchdog_register(&watchdog, "wdt", RT_DEVICE_FLAG_DEACTIVATE, RT_NULL) != RT_EOK)
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{
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LOG_E("wdt device register failed.");
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return -RT_ERROR;
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}
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LOG_D("wdt device register success.");
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return RT_EOK;
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}
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INIT_BOARD_EXPORT(rt_hw_wdt_init);
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#endif /* RT_USING_WDT */
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