void Install_clock(
rtems_isr_entry clock_isr
)
{
/*
* Initialize the clock tick device driver variables
*/
Clock_driver_ticks = 0;
Clock_isrs = rtems_configuration_get_milliseconds_per_tick();
mips_timer_rate = rtems_configuration_get_microseconds_per_tick() *
bsp_clicks_per_microsecond;
/*
* Hardware specific initialize goes here
*/
/* Set up USC heartbeat timer to generate interrupts */
disable_hbi(); /* Disable heartbeat interrupt in USC */
/* Install interrupt handler */
rtems_interrupt_handler_install(
CLOCK_VECTOR,
"clock",
0,
USC_isr,
NULL
);
init_hbt(); /* Initialize heartbeat timer */
reset_wdt(); /* Reset watchdog timer */
enable_wdi(); /* Enable watchdog interrupt in USC */
enable_hbi(); /* Enable heartbeat interrupt in USC */
/* Enable USC interrupt in MIPS processor */
mips_enable_in_interrupt_mask(CLOCK_VECTOR_MASK);
/*
* Schedule the clock cleanup routine to execute if the application exits.
*/
atexit( Clock_exit );
}
uint32_t TOD_MILLISECONDS_TO_TICKS(
uint32_t milliseconds
)
{
uint32_t ticks;
uint32_t milliseconds_per_tick;
/**
* We should ensure the ticks not be truncated by integer division. We
* need to have it be greater than or equal to the requested time. It
* should not be shorter.
*/
milliseconds_per_tick = rtems_configuration_get_milliseconds_per_tick();
ticks = milliseconds / milliseconds_per_tick;
if ( (milliseconds % milliseconds_per_tick) != 0 )
ticks += 1;
return ticks;
}
uint32_t TOD_MILLISECONDS_TO_TICKS(
uint32_t milliseconds
)
{
return (milliseconds / rtems_configuration_get_milliseconds_per_tick());
}
