microsecond_timer_gpt.cpp File Reference

Functions
void	portSetHardwareSchedulerTimer (efitick_t nowNt, efitick_t setTimeNt)
static void	hwTimerCallback (GPTDriver *)
void	portInitMicrosecondTimer ()
uint32_t	getTimeNowLowerNt ()

Variables
static constexpr GPTConfig	gpt5cfg

Function Documentation

getTimeNowLowerNt()

uint32_t getTimeNowLowerNt

(

)

Get a monotonically increasing (but wrapping) 32-bit timer value Implemented at port level, based on timer or CPU tick counter Main source of EFI clock, SW-extended to 64bits

2147483648 / ~168MHz = ~12 seconds to overflow

Definition at line 43 of file microsecond_timer_gpt.cpp.

                             {
    return port_rt_get_counter_value();
}

Referenced by getTimeNowNt(), handleShaftSignal(), onLockHook(), onUnlockHook(), and portMicrosecondTimerCallback().

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hwTimerCallback()

static void hwTimerCallback ( GPTDriver *  )

static

Definition at line 23 of file microsecond_timer_gpt.cpp.

                                        {
    portMicrosecondTimerCallback();
}

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portInitMicrosecondTimer()

void portInitMicrosecondTimer

(

)

This file defines the API for the microsecond timer that a port needs to implement

Do not call these functions directly, they should only be called by microsecond_timer.cpp

Definition at line 35 of file microsecond_timer_gpt.cpp.

                                {
    gptStart(&GPTDEVICE, &gpt5cfg);
    efiAssertVoid(ObdCode::CUSTOM_ERR_TIMER_STATE, GPTDEVICE.state == GPT_READY, "hw state");
}

Referenced by initMicrosecondTimer().

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portSetHardwareSchedulerTimer()

void portSetHardwareSchedulerTimer	(	efitick_t	nowNt,
		efitick_t	setTimeNt
	)

Definition at line 6 of file microsecond_timer_gpt.cpp.

                                                                         {
    int32_t deltaTimeUs = NT2US((int32_t)setTimeNt - (int32_t)nowNt);
 
    // If already set, reset the timer
    if (GPTDEVICE.state == GPT_ONESHOT) {
        gptStopTimerI(&GPTDEVICE);
    }
 
    if (GPTDEVICE.state != GPT_READY) {
        firmwareError(ObdCode::CUSTOM_HW_TIMER, "HW timer state %d", GPTDEVICE.state);
        return;
    }
 
    // Start the timer
    gptStartOneShotI(&GPTDEVICE, deltaTimeUs);
}

Referenced by setHardwareSchedulerTimer().

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Variable Documentation

gpt5cfg

constexpr GPTConfig gpt5cfg

staticconstexpr

Initial value:

= { 1000000, 
        hwTimerCallback, 
0, 0 }

Definition at line 31 of file microsecond_timer_gpt.cpp.

                                     { 1000000, /* 1 MHz timer clock.*/
        hwTimerCallback, /* Timer callback.*/
0, 0 };

Referenced by portInitMicrosecondTimer().

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