Merge pull request #546 from heyuanjie87/ForPullRequest

[DeviceDrivers] Add hardware timer framework

components/drivers/include/drivers/hwtimer.h

@@ -0,0 +1,78 @@
+#ifndef __HWTIMER_H__
+#define __HWTIMER_H__
+
+#include <rtthread.h>
+#include <rtdevice.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Timer Control Command */
+typedef enum
+{
+    HWTIMER_CTRL_FREQ_SET = 0x01,    /* set the count frequency */
+    HWTIMER_CTRL_STOP,               /* stop timer */
+    HWTIMER_CTRL_INFO_GET,           /* get a timer feature information */
+    HWTIMER_CTRL_MODE_SET            /* Setting the timing mode(oneshot/period) */
+} rt_hwtimer_ctrl_t;
+
+/* Timing Mode */
+typedef enum
+{
+    HWTIMER_MODE_ONESHOT = 0x01,
+    HWTIMER_MODE_PERIOD
+} rt_hwtimer_mode_t;
+
+/* Time Value */
+typedef struct rt_hwtimerval
+{
+    rt_int32_t sec;      /* second */
+    rt_int32_t usec;     /* microsecond */
+} rt_hwtimerval_t;
+
+#define HWTIMER_CNTMODE_UP      0x01 /* increment count mode */
+#define HWTIMER_CNTMODE_DW      0x02 /* decreasing count mode */
+
+struct rt_hwtimer_device;
+
+struct rt_hwtimer_ops
+{
+    void (*init)(struct rt_hwtimer_device *timer, rt_uint32_t state);
+    rt_err_t (*start)(struct rt_hwtimer_device *timer, rt_uint32_t cnt, rt_hwtimer_mode_t mode);
+    void (*stop)(struct rt_hwtimer_device *timer);
+    rt_uint32_t (*count_get)(struct rt_hwtimer_device *timer);
+    rt_err_t (*control)(struct rt_hwtimer_device *timer, rt_uint32_t cmd, void *args);
+};
+
+/* Timer Feature Information */
+struct rt_hwtimer_info
+{
+    rt_int32_t maxfreq;    /* the maximum count frequency timer support */
+    rt_int32_t minfreq;    /* the minimum count frequency timer support */
+    rt_uint32_t maxcnt;    /* counter maximum value */
+    rt_uint8_t  cntmode;   /* count mode (inc/dec) */
+};
+
+typedef struct rt_hwtimer_device
+{
+    struct rt_device parent;
+    const struct rt_hwtimer_ops *ops;
+    const struct rt_hwtimer_info *info;
+
+    rt_int32_t freq;                /* counting frequency set by the user */
+    rt_int32_t overflow;            /* timer overflows */
+    float period_sec;               
+    rt_int32_t cycles;              /* how many times will generate a timeout event after overflow */
+    rt_int32_t reload;              /* reload cycles(using in period mode) */
+    rt_hwtimer_mode_t mode;         /* timing mode(oneshot/period) */
+} rt_hwtimer_t;
+
+rt_err_t rt_device_hwtimer_register(rt_hwtimer_t *timer, const char *name, void *user_data);
+void rt_device_hwtimer_isr(rt_hwtimer_t *timer);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

components/drivers/include/rtdevice.h

@@ -370,6 +370,10 @@ rt_inline void rt_work_init(struct rt_work* work, void (*work_func)(struct rt_wo
 #include "drivers/can.h"
 #endif
 
+#ifdef RT_USING_HWTIMER
+#include "drivers/hwtimer.h"
+#endif
+
 #ifdef __cplusplus
 }
 #endif