1 /*
2 * Copyright (c) 2006-2023, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2020-01-22 shelton first version
9 * 2021-11-10 breo.com porting to n32
10 */
11
12 #include <board.h>
13 #include "drivers/dev_watchdog.h"
14
15 #ifdef RT_USING_WDT
16 #ifdef BSP_USING_WDT
17
18 #define LSI_VALUE 40000
19
20 //#define DRV_DEBUG
21 #define LOG_TAG "drv.wdt"
22 #include <drv_log.h>
23
24 struct n32_wdt_obj
25 {
26 IWDG_Module *instance;
27 rt_uint32_t Prescaler;
28 rt_uint32_t Reload;
29 rt_uint16_t is_start;
30 };
31 static struct n32_wdt_obj n32_wdt;
32 static struct rt_watchdog_ops ops;
33 static rt_watchdog_t watchdog;
34
wdt_init(rt_watchdog_t * wdt)35 static rt_err_t wdt_init(rt_watchdog_t *wdt)
36 {
37 return RT_EOK;
38 }
39
wdt_control(rt_watchdog_t * wdt,int cmd,void * arg)40 static rt_err_t wdt_control(rt_watchdog_t *wdt, int cmd, void *arg)
41 {
42 switch (cmd)
43 {
44 /* feed the watchdog */
45 case RT_DEVICE_CTRL_WDT_KEEPALIVE:
46 IWDG_ReloadKey();
47 break;
48 /* set watchdog timeout */
49 case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
50 #if defined(LSI_VALUE)
51 if (LSI_VALUE)
52 {
53 n32_wdt.Reload = (*((rt_uint32_t *)arg)) * LSI_VALUE / 256 ;
54 }
55 else
56 {
57 LOG_E("Please define the value of LSI_VALUE!");
58 }
59 if (n32_wdt.Reload > 0xFFF)
60 {
61 LOG_E("wdg set timeout parameter too large, please less than %ds", 0xFFF * 256 / LSI_VALUE);
62 return -RT_EINVAL;
63 }
64 #else
65 #error "Please define the value of LSI_VALUE!"
66 #endif
67 if (n32_wdt.is_start)
68 {
69 IWDG_WriteConfig(IWDG_WRITE_ENABLE);
70 IWDG_SetPrescalerDiv(n32_wdt.Prescaler);
71 IWDG_CntReload(n32_wdt.Reload);
72 IWDG_WriteConfig(IWDG_WRITE_DISABLE);
73 IWDG_Enable();
74 }
75 break;
76 case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
77 #if defined(LSI_VALUE)
78 if (LSI_VALUE)
79 {
80 (*((rt_uint32_t *)arg)) = n32_wdt.Reload * 256 / LSI_VALUE;
81 }
82 else
83 {
84 LOG_E("Please define the value of LSI_VALUE!");
85 }
86 #else
87 #error "Please define the value of LSI_VALUE!"
88 #endif
89 break;
90 case RT_DEVICE_CTRL_WDT_START:
91 IWDG_WriteConfig(IWDG_WRITE_ENABLE);
92 IWDG_SetPrescalerDiv(n32_wdt.Prescaler);
93 IWDG_CntReload(n32_wdt.Reload);
94 IWDG_WriteConfig(IWDG_WRITE_DISABLE);
95 IWDG_Enable();
96 n32_wdt.is_start = 1;
97 break;
98 default:
99 LOG_W("This command is not supported.");
100 return -RT_ERROR;
101 }
102 return RT_EOK;
103 }
104
rt_hw_wdt_init(void)105 int rt_hw_wdt_init(void)
106 {
107 n32_wdt.instance = IWDG;
108 n32_wdt.Prescaler = IWDG_PRESCALER_DIV256;
109 n32_wdt.Reload = 0x00000FFF;
110 n32_wdt.is_start = 0;
111
112 ops.init = &wdt_init;
113 ops.control = &wdt_control;
114 watchdog.ops = &ops;
115 /* register watchdog device */
116 if (rt_hw_watchdog_register(&watchdog, "wdt", RT_DEVICE_FLAG_DEACTIVATE, RT_NULL) != RT_EOK)
117 {
118 LOG_E("wdt device register failed.");
119 return -RT_ERROR;
120 }
121 LOG_D("wdt device register success.");
122 return RT_EOK;
123 }
124 INIT_BOARD_EXPORT(rt_hw_wdt_init);
125
126 #endif /* BSP_USING_WDT */
127 #endif /* RT_USING_WDT */
128
129