112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
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/*
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* Copyright (c) 2006-2021, 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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* 2021-03-03 iysheng first version
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*/
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#include <board.h>
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#define DBG_TAG "drv.wdt"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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#ifdef RT_USING_WDT
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typedef struct {
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struct rt_watchdog_device wdt;
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rt_uint32_t min_threshold_s;
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rt_uint32_t max_threshold_s;
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rt_uint32_t current_threshold_s;
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} gd32_wdt_device_t;
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static gd32_wdt_device_t g_wdt_dev;
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static rt_err_t gd32_iwdt_init(rt_watchdog_t *wdt)
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{
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rcu_osci_on(RCU_IRC40K);
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if (ERROR == rcu_osci_stab_wait(RCU_IRC40K))
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{
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LOG_E("failed init IRC40K clock for free watchdog.");
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return -EINVAL;
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}
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g_wdt_dev.min_threshold_s = 1;
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g_wdt_dev.max_threshold_s = (0xfff << 8) / 40000;
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LOG_I("threshold section [%u, %d]", \
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g_wdt_dev.min_threshold_s, g_wdt_dev.max_threshold_s);
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IWDG_Write_Enable(IWDG_WRITEACCESS_ENABLE);
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IWDG_SetPrescaler(IWDG_PRESCALER_256);
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IWDG_SetReloadValue(0xfff);
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IWDG_Write_Enable(IWDG_WRITEACCESS_DISABLE);
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return 0;
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}
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static rt_err_t gd32_iwdt_control(rt_watchdog_t *wdt, int cmd, void *arg)
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{
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rt_uint32_t param;
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switch (cmd)
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{
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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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case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
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param = *(rt_uint32_t *) arg;
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if ((param > g_wdt_dev.max_threshold_s) || \
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(param < g_wdt_dev.min_threshold_s))
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{
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LOG_E("invalid param@%u.", param);
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return -E2BIG;
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}
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else
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{
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g_wdt_dev.current_threshold_s = param;
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}
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IWDG_Write_Enable(IWDG_WRITEACCESS_ENABLE);
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IWDG_SetReloadValue(param * 40000 >> 8);
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IWDG_Write_Enable(IWDG_WRITEACCESS_DISABLE);
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break;
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case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
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*(rt_uint32_t *)arg = g_wdt_dev.current_threshold_s;
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break;
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case RT_DEVICE_CTRL_WDT_START:
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IWDG_Enable();
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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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static struct rt_watchdog_ops g_wdt_ops = {
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gd32_iwdt_init,
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gd32_iwdt_control,
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};
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static int rt_hw_iwdt_init(void)
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{
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rt_err_t ret;
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g_wdt_dev.wdt.ops = &g_wdt_ops;
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/* register watchdog device */
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if (rt_hw_watchdog_register(&g_wdt_dev.wdt, "iwdt", \
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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 ret;
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}
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INIT_BOARD_EXPORT(rt_hw_iwdt_init);
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#endif
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