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Contiki-Inga 3.x
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The clock library is the interface between Contiki and the platform specific clock functionality. More...
Macros | |
| #define | CLOCK_SECOND |
| A second, measured in system clock time. | |
Functions | |
| void | clock_init (void) |
| Initialize the clock library. More... | |
| CCIF clock_time_t | clock_time (void) |
| Get the current clock time. More... | |
| CCIF unsigned long | clock_seconds (void) |
| Get the current value of the platform seconds. More... | |
| void | clock_set_seconds (unsigned long sec) |
| Set the value of the platform seconds. More... | |
| void | clock_wait (clock_time_t t) |
| Wait for a given number of ticks. More... | |
| void | clock_delay_usec (uint16_t dt) |
| Delay a given number of microseconds. More... | |
| int | clock_fine_max (void) |
| Deprecated platform-specific routines. | |
| void | clock_delay (unsigned int delay) |
| Delay the CPU for a multiple of TODO. More... | |
The clock library is the interface between Contiki and the platform specific clock functionality.
The clock library defines a macro, CLOCK_SECOND, to convert seconds into the tick resolution of the platform. Typically this is 1-10 milliseconds, e.g. 4*CLOCK_SECOND could be 512. A 16 bit counter would thus overflow every 1-10 minutes. Platforms use the tick interrupt to maintain a long term count of seconds since startup.
Platforms may also implement rtimers for greater time resolution and for real-time interrupts, These use a corresponding RTIMER_SECOND.
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inline |
Delay the CPU for a multiple of TODO.
Delay the CPU for a multiple of TODO.
The original clock_delay for the msp430 used a granularity of 2.83 usec. This approximates that delay for values up to 1456 usec. (The largest core call in leds.c uses 400).
Definition at line 150 of file clock.c.
References clock_delay_usec().
Referenced by leds_blink().
| void clock_delay_usec | ( | uint16_t | len | ) |
Delay a given number of microseconds.
| dt | How many microseconds to delay. |
Delay a given number of microseconds.
Use the 250KHz MACA clock for longer delays to avoid interrupt effects. However that can't be used if the radio is being power cycled!
Delay a given number of microseconds.
| len | Delay len uSecs |
See clock_init() for GPT0 Timer A's configuration
Definition at line 196 of file clock.c.LOCAL.2341.c.
References DISABLE_INTERRUPTS, GPT_0_BASE, GPTIMER_CTL, GPTIMER_CTL_TAEN, GPTIMER_TAILR, and pic32_clock_get_system_clock().
Referenced by cc2430_rf_command(), clock_delay(), clock_delay_msec(), and mrf24j40_init().
| void clock_init | ( | void | ) |
Initialize the clock library.
Start the clock by enabling the timer comparison interrupts.
This function initializes the clock library and should be called from the main() function of the system.
Initialize the clock library.
We initialise the SysTick to fire 128 interrupts per second, giving us a value of 128 for CLOCK_SECOND
We also initialise GPT0:Timer A, which is used by clock_delay_usec(). We use 16-bit range (individual), count-down, one-shot, no interrupts. The system clock is at 16MHz giving us 62.5 nano sec ticks for Timer A. Prescaled by 16 gives us a very convenient 1 tick per usec
set Timer/Counter0 to be asynchronous from the CPU clock with a second external clock(32,768kHz) driving it.
Wait for TCN0UB, OCR0UB, and TCR0UB.
Definition at line 116 of file clock.c.LOCAL.2341.c.
References ATOMIC, BIT, CLOCK_SECOND, GPT_0_BASE, GPTIMER_CFG, GPTIMER_CTL, GPTIMER_TAMR, GPTIMER_TAPR, NULL, RTIMER_NOW, rtimer_set(), SYS_CTRL_RCGCGPT, SYS_CTRL_RCGCGPT_GPT0, SysTick_CLKSourceConfig(), SysTick_CounterCmd(), SysTick_ITConfig(), and SysTick_SetReload().
Referenced by main().
| unsigned long clock_seconds | ( | void | ) |
Get the current value of the platform seconds.
Return seconds, default is time since startup.
This could be the number of seconds since startup, or since a standard epoch.
The comparison avoids the need to disable clock interrupts for an atomic read of the four-byte variable.
Get the current value of the platform seconds.
The comparison avoids the need to disable clock interrupts for an atomic read of the four-byte variable.
Definition at line 144 of file clock.c.LOCAL.2341.c.
References NULL.
Referenced by stimer_elapsed(), stimer_expired(), stimer_remaining(), stimer_restart(), and stimer_set().
| void clock_set_seconds | ( | unsigned long | sec | ) |
Set the value of the platform seconds.
Set seconds, e.g.
| sec | The value to set. |
to a standard epoch for an absolute date/time.
Set the value of the platform seconds.
to a standard epoch for an absolute date/time.
Definition at line 157 of file clock.c.LOCAL.2341.c.
| clock_time_t clock_time | ( | void | ) |
Get the current clock time.
Return the tick counter.
This function returns the current system clock time.
When 16 bit it typically wraps every 10 minutes. The comparison avoids the need to disable clock interrupts for an atomic read of the multi-byte variable.
Get the current clock time.
When 16 bit it typically wraps every 10 minutes. The comparison avoids the need to disable clock interrupts for an atomic read of the multi-byte variable.
Definition at line 129 of file clock.c.LOCAL.2341.c.
References NULL.
Referenced by clock_wait(), timer_expired(), timer_remaining(), timer_restart(), and timer_set().
| void clock_wait | ( | clock_time_t | i | ) |
Wait for a given number of ticks.
Wait for a number of clock ticks.
| t | How many ticks. |
Definition at line 166 of file clock.c.LOCAL.2341.c.
References clock_time().
1.8.3.1