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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-03-03 iysheng first version
*/
#include <board.h>
#define DBG_TAG "drv.wdt"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#ifdef RT_USING_WDT
typedef struct {
struct rt_watchdog_device wdt;
rt_uint32_t min_threshold_s;
rt_uint32_t max_threshold_s;
rt_uint32_t current_threshold_s;
} gd32_wdt_device_t;
static gd32_wdt_device_t g_wdt_dev;
static rt_err_t gd32_iwdt_init(rt_watchdog_t *wdt)
{
rcu_osci_on(RCU_IRC40K);
if (ERROR == rcu_osci_stab_wait(RCU_IRC40K))
{
LOG_E("failed init IRC40K clock for free watchdog.");
return -EINVAL;
}
g_wdt_dev.min_threshold_s = 1;
g_wdt_dev.max_threshold_s = (0xfff << 8) / 40000;
LOG_I("threshold section [%u, %d]", \
g_wdt_dev.min_threshold_s, g_wdt_dev.max_threshold_s);
IWDG_Write_Enable(IWDG_WRITEACCESS_ENABLE);
IWDG_SetPrescaler(IWDG_PRESCALER_256);
IWDG_SetReloadValue(0xfff);
IWDG_Write_Enable(IWDG_WRITEACCESS_DISABLE);
return 0;
}
static rt_err_t gd32_iwdt_control(rt_watchdog_t *wdt, int cmd, void *arg)
{
rt_uint32_t param;
switch (cmd)
{
case RT_DEVICE_CTRL_WDT_KEEPALIVE:
IWDG_ReloadCounter();
break;
case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
param = *(rt_uint32_t *) arg;
if ((param > g_wdt_dev.max_threshold_s) || \
(param < g_wdt_dev.min_threshold_s))
{
LOG_E("invalid param@%u.", param);
return -E2BIG;
}
else
{
g_wdt_dev.current_threshold_s = param;
}
IWDG_Write_Enable(IWDG_WRITEACCESS_ENABLE);
IWDG_SetReloadValue(param * 40000 >> 8);
IWDG_Write_Enable(IWDG_WRITEACCESS_DISABLE);
break;
case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
*(rt_uint32_t *)arg = g_wdt_dev.current_threshold_s;
break;
case RT_DEVICE_CTRL_WDT_START:
IWDG_Enable();
break;
default:
LOG_W("This command is not supported.");
return -RT_ERROR;
}
return RT_EOK;
}
static struct rt_watchdog_ops g_wdt_ops = {
gd32_iwdt_init,
gd32_iwdt_control,
};
static int rt_hw_iwdt_init(void)
{
rt_err_t ret;
g_wdt_dev.wdt.ops = &g_wdt_ops;
/* register watchdog device */
if (rt_hw_watchdog_register(&g_wdt_dev.wdt, "iwdt", \
RT_DEVICE_FLAG_DEACTIVATE, RT_NULL) != RT_EOK)
{
LOG_E("wdt device register failed.");
return -RT_ERROR;
}
LOG_D("wdt device register success.");
return ret;
}
INIT_BOARD_EXPORT(rt_hw_iwdt_init);
#endif
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