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authorBernard Xiong <[email protected]>2018-12-14 11:05:58 +0800
committerGitHub <[email protected]>2018-12-14 11:05:58 +0800
commitf12d5bfba0b95befe87b5fba00d1e1aa87034daa (patch)
tree4eb7d06395a23837dc1819073764510447e7f174
parent698f9a91bdb4577f0d1e7823a7ece7863afd055b (diff)
parent6ea32ee488c8b76202d6707515dfff8cc2b28e4b (diff)
Merge pull request #2065 from qgyhd1234/hwtimer
完善 hwtimer 测试例程,修改 readme 显示错误
-rw-r--r--components/drivers/hwtimer/README_CN.md49
-rw-r--r--examples/test/hwtimer_test.c30
2 files changed, 50 insertions, 29 deletions
diff --git a/components/drivers/hwtimer/README_CN.md b/components/drivers/hwtimer/README_CN.md
index fb3b4fa60a..810b1b1d80 100644
--- a/components/drivers/hwtimer/README_CN.md
+++ b/components/drivers/hwtimer/README_CN.md
@@ -1,17 +1,16 @@
-定时器设备
-===
-
-##功能
----
+# 定时器设备
+
+## 功能
+
* 时间测量
* 周期或单次执行回调函数
-##编译
----
+## 编译
+
1. 在rtconfig.h添加 `#define RT_USING_HWTIMER`
-
-##使用流程
----
+
+## 使用流程
+
1. 以读写方式打开设备
2. 设置超时回调函数(如果需要)
3. 根据需要设置定时模式(单次/周期)
@@ -19,12 +18,12 @@
5. 写入超时值,定时器随即启动
6. 停止定时器(可选)
7. 关闭设备(如果需要)
-
+
应用参考 [hwtimer_test] (/examples/test/hwtimer\_test.c)
-##驱动编写指南
----
-###操作接口
+## 驱动编写指南
+
+### 操作接口
```
struct rt_hwtimer_ops
@@ -43,8 +42,8 @@ struct rt_hwtimer_ops
* count_get - <读取计数器值>
* control - <设置计数频率 >
-###定时器特征信息
-
+### 定时器特征信息
+
```
struct rt_hwtimer_info
{
@@ -60,7 +59,8 @@ struct rt_hwtimer_info
* maxcnt <计数器最大计数值>
* cntmode <递增计数/递减计数>
-###注册设备
+### 注册设备
+
```
static rt_hwtimer_t _timer0;
int stm32_hwtimer_init(void)
@@ -73,8 +73,9 @@ int stm32_hwtimer_init(void)
return 0;
}
```
-
-###定时器中断
+
+### 定时器中断
+
```
void timer_irq_handler(void)
{
@@ -84,15 +85,13 @@ void timer_irq_handler(void)
}
```
-##注意事项
----
-
-<font color="#FF0000">可能出现定时误差</font>
-
+## 注意事项
+
+**可能出现定时误差**
误差原因:
假设计数器最大值0xFFFF,计数频率1Mhz,定时时间1秒又1微秒。
-
+
由于定时器一次最多只能计时到65535us,对于1000001us的定时要求。
可以50000us定时20次完成,此时将会出现计算误差1us。
diff --git a/examples/test/hwtimer_test.c b/examples/test/hwtimer_test.c
index 8f69c4ef87..428373dde0 100644
--- a/examples/test/hwtimer_test.c
+++ b/examples/test/hwtimer_test.c
@@ -8,7 +8,7 @@
static rt_err_t timer_timeout_cb(rt_device_t dev, rt_size_t size)
{
- rt_kprintf("HT %d\n", rt_tick_get());
+ rt_kprintf("enter hardware timer isr\n");
return 0;
}
@@ -35,7 +35,7 @@ int hwtimer(void)
return -1;
}
- rt_device_set_rx_indicate(dev, timer_timeout_cb);
+ /* ʱ����� */
/* ����ʱ������(Ĭ��1Mhz��֧�ֵ���С����Ƶ��) */
err = rt_device_control(dev, HWTIMER_CTRL_FREQ_SET, &freq);
if (err != RT_EOK)
@@ -69,12 +69,34 @@ int hwtimer(void)
rt_device_read(dev, 0, &val, sizeof(val));
rt_kprintf("Read: Sec = %d, Usec = %d\n", val.sec, val.usec);
+ /* ��ʱִ�лص����� -- ����ģʽ */
+ /* ���ó�ʱ�ص����� */
+ rt_device_set_rx_indicate(dev, timer_timeout_cb);
+
+ /* ����ģʽ */
+ mode = HWTIMER_MODE_PERIOD;
+ err = rt_device_control(dev, HWTIMER_CTRL_MODE_SET, &mode);
+
+ /* ���ö�ʱ����ʱֵ��������ʱ�� */
+ val.sec = t;
+ val.usec = 0;
+ rt_kprintf("SetTime: Sec %d, Usec %d\n", val.sec, val.usec);
+ if (rt_device_write(dev, 0, &val, sizeof(val)) != sizeof(val))
+ {
+ rt_kprintf("SetTime Fail\n");
+ goto EXIT;
+ }
+
+ /* �ȴ��ص�����ִ�� */
+ rt_thread_delay((t + 1)*RT_TICK_PER_SECOND);
+
EXIT:
err = rt_device_close(dev);
rt_kprintf("Close %s\n", TIMER);
return err;
}
-
-FINSH_FUNCTION_EXPORT(hwtimer, "Test hardware timer");
+#ifdef FINSH_USING_MSH
+MSH_CMD_EXPORT(hwtimer, "Test hardware timer");
#endif
+#endif /* RT_USING_HWTIMER */