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fix problem when time counter overflow reversed #12

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fix problem when time counter overflow reversed #12

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12 changes: 11 additions & 1 deletion ebtn/ebtn.h
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Original file line number Diff line number Diff line change
Expand Up @@ -16,9 +16,11 @@ extern "C" {
#ifdef EBTN_CONFIG_TIMER_16
typedef uint16_t ebtn_time_t;
typedef int16_t ebtn_time_sign_t;
#define MAX_TIME_VALUE (0xffff)
#else
typedef uint32_t ebtn_time_t;
typedef int32_t ebtn_time_sign_t;
#define MAX_TIME_VALUE (0xffffffff)
#endif

/* Forward declarations */
Expand Down Expand Up @@ -56,7 +58,15 @@ typedef enum
*/
static inline ebtn_time_sign_t ebtn_timer_sub(ebtn_time_t time1, ebtn_time_t time2)
{
return time1 - time2;
if(time1 >= time2)
{
return time1 - time2;
}
else
{
return MAX_TIME_VALUE - time2 + time1;
}

}

// test time overflow error
Expand Down