103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
#include <rtthread.h>
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#include <rtdevice.h>
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#include <finsh.h>
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#ifdef RT_USING_HWTIMER
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#define TIMER "timer0"
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static rt_err_t timer_timeout_cb(rt_device_t dev, rt_size_t size)
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{
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rt_kprintf("enter hardware timer isr\n");
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return 0;
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}
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int hwtimer(void)
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{
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rt_err_t err;
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rt_hwtimerval_t val;
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rt_device_t dev = RT_NULL;
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rt_tick_t tick;
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rt_hwtimer_mode_t mode;
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int freq = 10000;
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int t = 5;
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if ((dev = rt_device_find(TIMER)) == RT_NULL)
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{
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rt_kprintf("No Device: %s\n", TIMER);
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return -1;
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}
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if (rt_device_open(dev, RT_DEVICE_OFLAG_RDWR) != RT_EOK)
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{
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rt_kprintf("Open %s Fail\n", TIMER);
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return -1;
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}
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/* 时间测量 */
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/* 计数时钟设置(默认1Mhz或支持的最小计数频率) */
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err = rt_device_control(dev, HWTIMER_CTRL_FREQ_SET, &freq);
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if (err != RT_EOK)
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{
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rt_kprintf("Set Freq=%dhz Fail\n", freq);
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goto EXIT;
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}
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/* 周期模式 */
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mode = HWTIMER_MODE_PERIOD;
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err = rt_device_control(dev, HWTIMER_CTRL_MODE_SET, &mode);
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tick = rt_tick_get();
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rt_kprintf("Start Timer> Tick: %d\n", tick);
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/* 设置定时器超时值并启动定时器 */
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val.sec = t;
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val.usec = 0;
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rt_kprintf("SetTime: Sec %d, Usec %d\n", val.sec, val.usec);
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if (rt_device_write(dev, 0, &val, sizeof(val)) != sizeof(val))
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{
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rt_kprintf("SetTime Fail\n");
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goto EXIT;
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}
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rt_kprintf("Sleep %d sec\n", t);
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rt_thread_delay(t*RT_TICK_PER_SECOND);
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/* 停止定时器 */
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err = rt_device_control(dev, HWTIMER_CTRL_STOP, RT_NULL);
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rt_kprintf("Timer Stoped\n");
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/* 读取计数 */
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rt_device_read(dev, 0, &val, sizeof(val));
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rt_kprintf("Read: Sec = %d, Usec = %d\n", val.sec, val.usec);
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/* 定时执行回调函数 -- 单次模式 */
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/* 设置超时回调函数 */
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rt_device_set_rx_indicate(dev, timer_timeout_cb);
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/* 单次模式 */
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mode = HWTIMER_MODE_PERIOD;
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err = rt_device_control(dev, HWTIMER_CTRL_MODE_SET, &mode);
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/* 设置定时器超时值并启动定时器 */
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val.sec = t;
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val.usec = 0;
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rt_kprintf("SetTime: Sec %d, Usec %d\n", val.sec, val.usec);
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if (rt_device_write(dev, 0, &val, sizeof(val)) != sizeof(val))
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{
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rt_kprintf("SetTime Fail\n");
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goto EXIT;
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}
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/* 等待回调函数执行 */
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rt_thread_delay((t + 1)*RT_TICK_PER_SECOND);
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EXIT:
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err = rt_device_close(dev);
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rt_kprintf("Close %s\n", TIMER);
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return err;
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}
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#ifdef FINSH_USING_MSH
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MSH_CMD_EXPORT(hwtimer, "Test hardware timer");
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#endif
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#endif /* RT_USING_HWTIMER */
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