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 * 2023-04-01 wcx1024979076 first version.
9 */
10 /*
11 * 程序清单：这是一个 hwtimer 设备使用例程
12 * 例程导出了 hwtimer_sample 命令到控制终端
13 * 命令调用格式：hwtimer_sample
14 * 程序功能：硬件定时器超时回调函数周期性的打印当前tick值，2次tick值之差换算为时间等同于定时时间值。
15 */
16
17 #include <rtthread.h>
18 #include <rtdevice.h>
19
20 #ifdef BSP_USING_HWTIMER
21
22 #define HWTIMER_DEV_NAME "timer0" /* 定时器名称 */
23
24 /* 定时器超时回调函数 */
timeout_cb(rt_device_t dev,rt_size_t size)25 static rt_err_t timeout_cb(rt_device_t dev, rt_size_t size)
26 {
27 rt_kprintf("this is hwtimer timeout callback fucntion!\n");
28 rt_kprintf("tick is :%d !\n", rt_tick_get());
29
30 return 0;
31 }
32
hwtimer_sample(int argc,char * argv[])33 static int hwtimer_sample(int argc, char *argv[])
34 {
35 rt_err_t ret = RT_EOK;
36 rt_hwtimerval_t timeout_s; /* 定时器超时值 */
37 rt_device_t hw_dev = RT_NULL; /* 定时器设备句柄 */
38 rt_hwtimer_mode_t mode; /* 定时器模式 */
39 rt_uint32_t freq = 10000; /* 计数频率 */
40
41 /* 查找定时器设备 */
42 hw_dev = rt_device_find(HWTIMER_DEV_NAME);
43 if (hw_dev == RT_NULL)
44 {
45 rt_kprintf("hwtimer sample run failed! can't find %s device!\n", HWTIMER_DEV_NAME);
46 return -RT_ERROR;
47 }
48
49 /* 以读写方式打开设备 */
50 ret = rt_device_open(hw_dev, RT_DEVICE_OFLAG_RDWR);
51 if (ret != RT_EOK)
52 {
53 rt_kprintf("open %s device failed!\n", HWTIMER_DEV_NAME);
54 return ret;
55 }
56
57 /* 设置超时回调函数 */
58 rt_device_set_rx_indicate(hw_dev, timeout_cb);
59
60 /* 设置计数频率(若未设置该项，默认为1Mhz 或 支持的最小计数频率) */
61 rt_device_control(hw_dev, HWTIMER_CTRL_FREQ_SET, &freq);
62 /* 设置模式为周期性定时器（若未设置，默认是HWTIMER_MODE_ONESHOT）*/
63 mode = HWTIMER_MODE_PERIOD;
64 ret = rt_device_control(hw_dev, HWTIMER_CTRL_MODE_SET, &mode);
65 if (ret != RT_EOK)
66 {
67 rt_kprintf("set mode failed! ret is :%d\n", ret);
68 return ret;
69 }
70
71 /* 设置定时器超时值为2s并启动定时器 */
72 timeout_s.sec = 2; /* 秒 */
73 timeout_s.usec = 0; /* 微秒 */
74 if (rt_device_write(hw_dev, 0, &timeout_s, sizeof(timeout_s)) != sizeof(timeout_s))
75 {
76 rt_kprintf("set timeout value failed\n");
77 return -RT_ERROR;
78 }
79
80 /* 延时1500ms */
81 rt_thread_mdelay(1500);
82
83 /* 读取定时器当前值 */
84 rt_device_read(hw_dev, 0, &timeout_s, sizeof(timeout_s));
85 rt_kprintf("Read: Sec = %d, Usec = %d\n", timeout_s.sec, timeout_s.usec);
86
87 return ret;
88 }
89 /* 导出到 msh 命令列表中 */
90 MSH_CMD_EXPORT(hwtimer_sample, hwtimer sample);
91
92 #endif /* RT_USING_HWTIMER */
93