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dm36x: Add usec timer measurement functions.

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Kelvin Lawson
2013-11-17 21:49:02 +00:00
parent 2393a08321
commit dac9fdf6e8
2 changed files with 45 additions and 2 deletions
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2
ports/arm/atomport.h
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@@ -55,6 +55,8 @@
extern void archUsleep (int32_t microsecs);
extern int32_t archUsleepStart (void);
extern int archUsleepCheckExpired (int32_t start_time, int32_t delay_usecs);
extern int32_t archUsecStart (void);
extern int32_t archUsecDiff (int32_t start_time);
/**
* ISR handler registration (optional, not available on all ports)

45
ports/arm/platforms/dm36x/timer.c
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@@ -135,7 +135,7 @@ void archUsleep (int32_t microsecs)
/**
* \b archUsleepStart
*
* Start a usec timer session.
* Start a usleep timer session.
*
* @retval Start time for use in subsequent archUsleepCheckExpired() calls
*
@@ -156,7 +156,7 @@ int32_t archUsleepStart (void)
/**
* \b archUsleepCheckExpired
*
* Test whether a usec timer session has expired.
* Test whether a usleep timer session has expired.
*
* @param[in] start_time Beginning of timer expiry check session (returned by archUsleepStart())
* @param[in] delay_usecs Number of microsecs to check have expired after start_timE
@@ -176,3 +176,44 @@ int archUsleepCheckExpired (int32_t start_time, int32_t delay_usecs)
status = (((int32_t)TIMER_REG(DM36X_TIMER_TIM12) - start_time) < delay_timer_ticks) ? 0 : 1;
return (status);
}
/**
* \b archUsecStart
*
* Start a usec timer session for use with archUsecDiff() layer.
*
* @retval Start time for use in subsequent archUsecDiff() calls
*
*/
int32_t archUsecStart (void)
{
/* Check we are initialised */
if (initialised == FALSE)
{
timer_init();
}
/* Return the current 24MHz count */
return (TIMER_REG(DM36X_TIMER_TIM12));
}
/**
* \b archUsecDiff
*
* Calculate the usecs that have expired since the passed "start_time".
*
* The 24MHz timer rolls over every 178 seconds. The use of a signed
* integer means that this cannot be used to measure periods over 89 seconds.
*
* @param[in] start_time Beginning of time difference session (returned by archUsecStart())
*
* @retval Number of microseconds expired since start_time
*
*/
int32_t archUsecDiff (int32_t start_time)
{
/* Translate diff in 24MHz ticks to usecs */
return (((int32_t)TIMER_REG(DM36X_TIMER_TIM12) - start_time) / (TIMER_CLK / 1000000));
}