1 /*
2 * Copyright (c) 2006-2021, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 */
9
10 #include <rtthread.h>
11 #include <rtdevice.h>
12 #include <finsh.h>
13
14 #ifdef RT_USING_HWTIMER
15
16 #define TIMER "timer0"
17
timer_timeout_cb(rt_device_t dev,rt_size_t size)18 static rt_err_t timer_timeout_cb(rt_device_t dev, rt_size_t size)
19 {
20 rt_kprintf("enter hardware timer isr\n");
21
22 return 0;
23 }
24
hwtimer(void)25 int hwtimer(void)
26 {
27 rt_err_t err;
28 rt_hwtimerval_t val;
29 rt_device_t dev = RT_NULL;
30 rt_tick_t tick;
31 rt_hwtimer_mode_t mode;
32 int freq = 10000;
33 int t = 5;
34
35 if ((dev = rt_device_find(TIMER)) == RT_NULL)
36 {
37 rt_kprintf("No Device: %s\n", TIMER);
38 return -1;
39 }
40
41 if (rt_device_open(dev, RT_DEVICE_OFLAG_RDWR) != RT_EOK)
42 {
43 rt_kprintf("Open %s Fail\n", TIMER);
44 return -1;
45 }
46
47 /* 时间测量 */
48 /* 计数时钟设置(默认1Mhz或支持的最小计数频率) */
49 err = rt_device_control(dev, HWTIMER_CTRL_FREQ_SET, &freq);
50 if (err != RT_EOK)
51 {
52 rt_kprintf("Set Freq=%dhz Fail\n", freq);
53 goto EXIT;
54 }
55
56 /* 周期模式 */
57 mode = HWTIMER_MODE_PERIOD;
58 err = rt_device_control(dev, HWTIMER_CTRL_MODE_SET, &mode);
59
60 tick = rt_tick_get();
61 rt_kprintf("Start Timer> Tick: %d\n", tick);
62 /* 设置定时器超时值并启动定时器 */
63 val.sec = t;
64 val.usec = 0;
65 rt_kprintf("SetTime: Sec %d, Usec %d\n", val.sec, val.usec);
66 if (rt_device_write(dev, 0, &val, sizeof(val)) != sizeof(val))
67 {
68 rt_kprintf("SetTime Fail\n");
69 goto EXIT;
70 }
71 rt_kprintf("Sleep %d sec\n", t);
72 rt_thread_delay(t*RT_TICK_PER_SECOND);
73
74 /* 停止定时器 */
75 err = rt_device_control(dev, HWTIMER_CTRL_STOP, RT_NULL);
76 rt_kprintf("Timer Stoped\n");
77 /* 读取计数 */
78 rt_device_read(dev, 0, &val, sizeof(val));
79 rt_kprintf("Read: Sec = %d, Usec = %d\n", val.sec, val.usec);
80
81 /* 定时执行回调函数 -- 单次模式 */
82 /* 设置超时回调函数 */
83 rt_device_set_rx_indicate(dev, timer_timeout_cb);
84
85 /* 单次模式 */
86 mode = HWTIMER_MODE_PERIOD;
87 err = rt_device_control(dev, HWTIMER_CTRL_MODE_SET, &mode);
88
89 /* 设置定时器超时值并启动定时器 */
90 val.sec = t;
91 val.usec = 0;
92 rt_kprintf("SetTime: Sec %d, Usec %d\n", val.sec, val.usec);
93 if (rt_device_write(dev, 0, &val, sizeof(val)) != sizeof(val))
94 {
95 rt_kprintf("SetTime Fail\n");
96 goto EXIT;
97 }
98
99 /* 等待回调函数执行 */
100 rt_thread_delay((t + 1)*RT_TICK_PER_SECOND);
101
102 EXIT:
103 err = rt_device_close(dev);
104 rt_kprintf("Close %s\n", TIMER);
105
106 return err;
107 }
108 #ifdef RT_USING_FINSH
109 MSH_CMD_EXPORT(hwtimer, "Test hardware timer");
110 #endif
111 #endif /* RT_USING_HWTIMER */
112