86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
|
/*
|
|||
|
|
* Copyright (c) 2006-2018, RT-Thread Development Team
|
|||
|
|
*
|
|||
|
|
* SPDX-License-Identifier: Apache-2.0
|
|||
|
|
*
|
|||
|
|
* Change Logs:
|
|||
|
|
* Date Author Notes
|
|||
|
|
* 2018-11-30 misonyo first implementation.
|
|||
|
|
*/
|
|||
|
|
/*
|
|||
|
|
* 程序清单：这是一个 hwtimer 设备使用例程
|
|||
|
|
* 例程导出了 hwtimer_sample 命令到控制终端
|
|||
|
|
* 命令调用格式：hwtimer_sample
|
|||
|
|
* 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。
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
#include <rtthread.h>
|
|||
|
|
#include <rtdevice.h>
|
|||
|
|
|
|||
|
|
#define HWTIMER_DEV_NAME "timer0" /* 定时器名称 */
|
|||
|
|
|
|||
|
|
/* 定时器超时回调函数 */
|
|||
|
|
static rt_err_t timeout_cb(rt_device_t dev, rt_size_t size)
|
|||
|
|
{
|
|||
|
|
rt_kprintf("tick is :%d !\n", rt_tick_get());
|
|||
|
|
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
static int hwtimer_sample(int argc, char *argv[])
|
|||
|
|
{
|
|||
|
|
rt_err_t ret = RT_EOK;
|
|||
|
|
rt_hwtimerval_t timeout_s; /* 定时器超时值 */
|
|||
|
|
rt_device_t hw_dev = RT_NULL; /* 定时器设备句柄 */
|
|||
|
|
rt_hwtimer_mode_t mode; /* 定时器模式 */
|
|||
|
|
|
|||
|
|
/* 查找定时器设备 */
|
|||
|
|
hw_dev = rt_device_find(HWTIMER_DEV_NAME);
|
|||
|
|
if (hw_dev == RT_NULL)
|
|||
|
|
{
|
|||
|
|
rt_kprintf("hwtimer sample run failed! can't find %s device!\n", HWTIMER_DEV_NAME);
|
|||
|
|
return RT_ERROR;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* 以读写方式打开设备 */
|
|||
|
|
ret = rt_device_open(hw_dev, RT_DEVICE_OFLAG_RDWR);
|
|||
|
|
if (ret != RT_EOK)
|
|||
|
|
{
|
|||
|
|
rt_kprintf("open %s device failed!\n", HWTIMER_DEV_NAME);
|
|||
|
|
return ret;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* 设置超时回调函数 */
|
|||
|
|
rt_device_set_rx_indicate(hw_dev, timeout_cb);
|
|||
|
|
|
|||
|
|
/* 设置模式为周期性定时器 */
|
|||
|
|
mode = HWTIMER_MODE_PERIOD;
|
|||
|
|
ret = rt_device_control(hw_dev, HWTIMER_CTRL_MODE_SET, &mode);
|
|||
|
|
if (ret != RT_EOK)
|
|||
|
|
{
|
|||
|
|
rt_kprintf("set mode failed! ret is :%d\n", ret);
|
|||
|
|
return ret;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* 设置定时器超时值为5s并启动定时器 */
|
|||
|
|
timeout_s.sec = 5; /* 秒 */
|
|||
|
|
timeout_s.usec = 0; /* 微秒 */
|
|||
|
|
|
|||
|
|
if (rt_device_write(hw_dev, 0, &timeout_s, sizeof(timeout_s)) != sizeof(timeout_s))
|
|||
|
|
{
|
|||
|
|
rt_kprintf("set timeout value failed\n");
|
|||
|
|
return RT_ERROR;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* 延时3500ms */
|
|||
|
|
rt_thread_mdelay(3500);
|
|||
|
|
|
|||
|
|
/* 读取定时器当前值 */
|
|||
|
|
rt_device_read(hw_dev, 0, &timeout_s, sizeof(timeout_s));
|
|||
|
|
rt_kprintf("Read: Sec = %d, Usec = %d\n", timeout_s.sec, timeout_s.usec);
|
|||
|
|
|
|||
|
|
return ret;
|
|||
|
|
}
|
|||
|
|
/* 导出到 msh 命令列表中 */
|
|||
|
|
MSH_CMD_EXPORT(hwtimer_sample, hwtimer sample);
|