92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
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* Copyright (c) 2006-2023, 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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* 2023-04-01 wcx1024979076 first version.
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*/
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/*
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* 程序清单：这是一个 hwtimer 设备使用例程
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* 例程导出了 hwtimer_sample 命令到控制终端
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* 命令调用格式：hwtimer_sample
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* 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。
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#ifdef RT_USING_HWTIMER
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#define HWTIMER_DEV_NAME "timer0" /* 定时器名称 */
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/* 定时器超时回调函数 */
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static rt_err_t timeout_cb(rt_device_t dev, rt_size_t size)
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{
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rt_kprintf("this is hwtimer timeout callback fucntion!\n");
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rt_kprintf("tick is :%d !\n", rt_tick_get());
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return 0;
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}
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static int hwtimer_sample(int argc, char *argv[])
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{
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rt_err_t ret = RT_EOK;
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rt_hwtimerval_t timeout_s; /* 定时器超时值 */
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rt_device_t hw_dev = RT_NULL; /* 定时器设备句柄 */
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rt_hwtimer_mode_t mode; /* 定时器模式 */
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rt_uint32_t freq = 10000; /* 计数频率 */
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/* 查找定时器设备 */
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hw_dev = rt_device_find(HWTIMER_DEV_NAME);
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if (hw_dev == RT_NULL)
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{
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rt_kprintf("hwtimer sample run failed! can't find %s device!\n", HWTIMER_DEV_NAME);
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return -RT_ERROR;
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}
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/* 以读写方式打开设备 */
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ret = rt_device_open(hw_dev, RT_DEVICE_OFLAG_RDWR);
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if (ret != RT_EOK)
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{
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rt_kprintf("open %s device failed!\n", HWTIMER_DEV_NAME);
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return ret;
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}
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/* 设置超时回调函数 */
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rt_device_set_rx_indicate(hw_dev, timeout_cb);
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/* 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) */
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rt_device_control(hw_dev, HWTIMER_CTRL_FREQ_SET, &freq);
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/* 设置模式为周期性定时器（若未设置，默认是HWTIMER_MODE_ONESHOT）*/
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mode = HWTIMER_MODE_PERIOD;
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ret = rt_device_control(hw_dev, HWTIMER_CTRL_MODE_SET, &mode);
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if (ret != RT_EOK)
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{
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rt_kprintf("set mode failed! ret is :%d\n", ret);
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return ret;
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}
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/* 设置定时器超时值为2s并启动定时器 */
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timeout_s.sec = 2; /* 秒 */
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timeout_s.usec = 0; /* 微秒 */
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if (rt_device_write(hw_dev, 0, &timeout_s, sizeof(timeout_s)) != sizeof(timeout_s))
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{
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rt_kprintf("set timeout value failed\n");
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return -RT_ERROR;
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}
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/* 延时1500ms */
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rt_thread_mdelay(1500);
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/* 读取定时器当前值 */
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rt_device_read(hw_dev, 0, &timeout_s, sizeof(timeout_s));
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rt_kprintf("Read: Sec = %d, Usec = %d\n", timeout_s.sec, timeout_s.usec);
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return ret;
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}
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/* 导出到 msh 命令列表中 */
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MSH_CMD_EXPORT(hwtimer_sample, hwtimer sample);
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#endif /* RT_USING_HWTIMER */
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