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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-02-22 airm2m first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>
#ifdef BSP_USING_WDT
#define LOG_TAG "drv.wdt"
#include "drv_log.h"
struct watchdog_device
{
rt_watchdog_t parent;
IWDG_TypeDef *instance;
rt_uint32_t prescaler;
rt_uint32_t reload;
rt_uint16_t is_start;
};
static struct watchdog_device watchdog_dev;
static rt_err_t air32_wdt_init(rt_watchdog_t *wdt)
{
return RT_EOK;
}
static rt_err_t air32_wdt_control(rt_watchdog_t *wdt, int cmd, void *arg)
{
struct watchdog_device *wdt_dev;
wdt_dev = (struct watchdog_device *)wdt;
switch (cmd)
{
/* feed the watchdog */
case RT_DEVICE_CTRL_WDT_KEEPALIVE:
IWDG_ReloadCounter();
break;
/* set watchdog timeout */
case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
wdt_dev->reload = (*((rt_uint32_t *)arg)) * 40000 / 256;
if (wdt_dev->reload > 0xFFF)
{
LOG_E("wdg set timeout parameter too large, please less than %ds", 0xFFF * 256 / 40000);
return -RT_EINVAL;
}
if (wdt_dev->is_start)
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler(wdt_dev->prescaler);
IWDG_SetReload(wdt_dev->reload);
IWDG_WriteAccessCmd(IWDG_WriteAccess_Disable);
IWDG_Enable();
}
break;
case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
(*((rt_uint32_t *)arg)) = wdt_dev->reload * 256 / 40000;
break;
case RT_DEVICE_CTRL_WDT_START:
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler(wdt_dev->prescaler);
IWDG_SetReload(wdt_dev->reload);
IWDG_WriteAccessCmd(IWDG_WriteAccess_Disable);
IWDG_Enable();
wdt_dev->is_start = 1;
break;
default:
LOG_W("This command is not supported.");
return -RT_ERROR;
}
return RT_EOK;
}
static struct rt_watchdog_ops watchdog_ops =
{
.init = air32_wdt_init,
.control = air32_wdt_control,
};
int rt_hw_wdt_init(void)
{
watchdog_dev.instance = IWDG;
watchdog_dev.prescaler = IWDG_Prescaler_256;
watchdog_dev.reload = 0x0000FFF;
watchdog_dev.is_start = 0;
watchdog_dev.parent.ops = &watchdog_ops;
/* register watchdog device */
if (rt_hw_watchdog_register(&watchdog_dev.parent, "wdt", RT_DEVICE_FLAG_DEACTIVATE, RT_NULL) != RT_EOK)
{
LOG_E("wdt device register failed.");
return -RT_ERROR;
}
LOG_D("wdt device register success.");
return RT_EOK;
}
INIT_BOARD_EXPORT(rt_hw_wdt_init);
#endif /* BSP_USING_IWDT */
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