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sys_clock: Make sys_clock_hw_cycles_per_tick() a proper API

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This was another "global variable" API.  Give it function syntax too.
Also add a warning, because on nRF devices (at least) the cycle clock
runs in kHz and is too slow to give a precise answer here.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2018-09-19 11:33:07 -07:00 • committed by Anas Nashif
commit b2e4283555
15 changed files with 59 additions and 66 deletions
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10
drivers/timer/cortex_m_systick.c
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@ -313,7 +313,7 @@ void _timer_int_handler(void *unused)
* No tickless idle:
* Update the total tick count and announce this tick to the kernel.
*/
clock_accumulated_count += sys_clock_hw_cycles_per_tick;
clock_accumulated_count += sys_clock_hw_cycles_per_tick();
_sys_clock_tick_announce();
#endif /* CONFIG_TICKLESS_IDLE */
@ -336,7 +336,7 @@ void _timer_int_handler(void *unused)
#else /* !CONFIG_SYS_POWER_MANAGEMENT */
/* accumulate total counter value */
clock_accumulated_count += sys_clock_hw_cycles_per_tick;
clock_accumulated_count += sys_clock_hw_cycles_per_tick();
/*
* one more tick has occurred -- don't need to do anything special since
@ -709,9 +709,9 @@ int _sys_clock_driver_init(struct device *device)
*/
/* systick supports 24-bit H/W counter */
__ASSERT(sys_clock_hw_cycles_per_tick <= (1 << 24),
"sys_clock_hw_cycles_per_tick too large");
sysTickReloadSet(sys_clock_hw_cycles_per_tick - 1);
__ASSERT(sys_clock_hw_cycles_per_tick() <= (1 << 24),
"sys_clock_hw_cycles_per_tick() too large");
sysTickReloadSet(sys_clock_hw_cycles_per_tick() - 1);
#ifdef CONFIG_TICKLESS_IDLE