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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-01-22 shelton first version
*/
#include <board.h>
#include <drivers/watchdog.h>
#ifdef RT_USING_WDT
#define LSI_VALUE 40000
//#define DRV_DEBUG
#define LOG_TAG "drv.wdt"
#include <drv_log.h>
struct at32_wdt_obj
{
IWDG_Type *instance;
rt_uint32_t Prescaler;
rt_uint32_t Reload;
rt_uint16_t is_start;
};
static struct at32_wdt_obj at32_wdt;
static struct rt_watchdog_ops ops;
static rt_watchdog_t watchdog;
static rt_err_t wdt_init(rt_watchdog_t *wdt)
{
return RT_EOK;
}
static rt_err_t wdt_control(rt_watchdog_t *wdt, int cmd, void *arg)
{
switch (cmd)
{
/* feed the watchdog */
case RT_DEVICE_CTRL_WDT_KEEPALIVE:
IWDG_ReloadCounter();
break;
/* set watchdog timeout */
case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
#if defined(LSI_VALUE)
if(LSI_VALUE)
{
at32_wdt.Reload = (*((rt_uint32_t*)arg)) * LSI_VALUE / 256 ;
}
else
{
LOG_E("Please define the value of LSI_VALUE!");
}
if(at32_wdt.Reload > 0xFFF)
{
LOG_E("wdg set timeout parameter too large, please less than %ds",0xFFF * 256 / LSI_VALUE);
return -RT_EINVAL;
}
#else
#error "Please define the value of LSI_VALUE!"
#endif
if(at32_wdt.is_start)
{
IWDG_KeyRegWrite(IWDG_KeyRegWrite_Enable);
IWDG_SetPrescaler(at32_wdt.Prescaler);
IWDG_SetReload(at32_wdt.Reload);
IWDG_KeyRegWrite(IWDG_KeyRegWrite_Disable);
IWDG_Enable();
}
break;
case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
#if defined(LSI_VALUE)
if(LSI_VALUE)
{
(*((rt_uint32_t*)arg)) = at32_wdt.Reload * 256 / LSI_VALUE;
}
else
{
LOG_E("Please define the value of LSI_VALUE!");
}
#else
#error "Please define the value of LSI_VALUE!"
#endif
break;
case RT_DEVICE_CTRL_WDT_START:
IWDG_KeyRegWrite(IWDG_KeyRegWrite_Enable);
IWDG_SetPrescaler(at32_wdt.Prescaler);
IWDG_SetReload(at32_wdt.Reload);
IWDG_KeyRegWrite(IWDG_KeyRegWrite_Disable);
IWDG_Enable();
at32_wdt.is_start = 1;
break;
default:
LOG_W("This command is not supported.");
return -RT_ERROR;
}
return RT_EOK;
}
int rt_hw_wdt_init(void)
{
at32_wdt.instance = IWDG;
at32_wdt.Prescaler = IWDG_Psc_256;
at32_wdt.Reload = 0x00000FFF;
at32_wdt.is_start = 0;
ops.init = &wdt_init;
ops.control = &wdt_control;
watchdog.ops = &ops;
/* register watchdog device */
if (rt_hw_watchdog_register(&watchdog, "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 /* RT_USING_WDT */
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