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/*
* Copyright (c) 2006-2024 RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2024-11-25 hywing The first version for NXP MCXA153 Board
*/
#include <rtthread.h>
#include "drv_wdt.h"
#include "fsl_wwdt.h"
#include "fsl_clock.h"
#ifdef RT_USING_WDT
#define WDT_CLK_FREQ CLOCK_GetWwdtClkFreq()
#define WWDT WWDT0
#define APP_WDT_IRQn WWDT0_IRQn
#define APP_WDT_IRQ_HANDLER WWDT0_IRQHandler
struct mcx_wdt
{
rt_watchdog_t watchdog;
WWDT_Type *wdt_base;
};
static struct mcx_wdt wdt_dev;
void APP_WDT_IRQ_HANDLER(void)
{
uint32_t wdtStatus = WWDT_GetStatusFlags(WWDT);
/*APP_LED_TOGGLE;*/
/* The chip will reset before this happens */
if (wdtStatus & kWWDT_TimeoutFlag)
{
WWDT_ClearStatusFlags(WWDT, kWWDT_TimeoutFlag);
}
/* Handle warning interrupt */
if (wdtStatus & kWWDT_WarningFlag)
{
/* A watchdog feed didn't occur prior to warning timeout */
WWDT_ClearStatusFlags(WWDT, kWWDT_WarningFlag);
/* User code. User can do urgent case before timeout reset.
* IE. user can backup the ram data or ram log to flash.
* the period is set by config.warningValue, user need to
* check the period between warning interrupt and timeout.
*/
}
SDK_ISR_EXIT_BARRIER;
}
static rt_err_t wdt_init(rt_watchdog_t *wdt)
{
wwdt_config_t config;
uint32_t wdtFreq;
bool timeOutResetEnable;
/* Enable the WWDT time out to reset the CPU. */
timeOutResetEnable = true;
/* The WDT divides the input frequency into it by 4 */
wdtFreq = WDT_CLK_FREQ / 4;
WWDT_GetDefaultConfig(&config);
/*
* Set watchdog feed time constant to approximately 4s
* Set watchdog warning time to 512 ticks after feed time constant
* Set watchdog window time to 1s
*/
config.timeoutValue = wdtFreq * 4;
config.warningValue = 512;
config.windowValue = wdtFreq * 1;
/* Configure WWDT to reset on timeout */
config.enableWatchdogReset = true;
/* Setup watchdog clock frequency(Hz). */
config.clockFreq_Hz = WDT_CLK_FREQ;
WWDT_Init(WWDT, &config);
NVIC_EnableIRQ(APP_WDT_IRQn);
return RT_EOK;
}
void delayWwdtWindow(void)
{
/* For the TV counter register value will decrease after feed watch dog,
* we can use it to as delay. But in user scene, user need feed watch dog
* in the time period after enter Window but before warning intterupt.
*/
while (WWDT->TV > WWDT->WINDOW)
{
__NOP();
}
}
static rt_err_t wdt_control(rt_watchdog_t *wdt, int cmd, void *arg)
{
switch (cmd)
{
case RT_DEVICE_CTRL_WDT_START:
WWDT_Enable(wdt_dev.wdt_base);
return RT_EOK;
case RT_DEVICE_CTRL_WDT_STOP:
WWDT_Disable(wdt_dev.wdt_base);
return RT_EOK;
case RT_DEVICE_CTRL_WDT_KEEPALIVE:
delayWwdtWindow();
WWDT_Refresh(wdt_dev.wdt_base);
return RT_EOK;
case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
if (arg != RT_NULL)
{
uint32_t timeout = *((uint32_t *)arg);
timeout = timeout * WDT_CLK_FREQ / 4;
WWDT_SetTimeoutValue(wdt_dev.wdt_base, timeout);
return RT_EOK;
}
return -RT_ERROR;
default:
return -RT_ERROR;
}
}
static struct rt_watchdog_ops wdt_ops =
{
wdt_init,
wdt_control,
};
int rt_hw_wdt_init(void)
{
wdt_dev.wdt_base = WWDT;
wdt_dev.watchdog.ops = &wdt_ops;
if (rt_hw_watchdog_register(&wdt_dev.watchdog, "wdt", RT_DEVICE_FLAG_DEACTIVATE, RT_NULL) != RT_EOK)
{
rt_kprintf("wdt register failed\n");
return -RT_ERROR;
}
return RT_EOK;
}
INIT_BOARD_EXPORT(rt_hw_wdt_init);
#endif /* RT_USING_WDT */
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