systick.h File Reference

#include <stm32f4xx.h>
#include <hal_types.h>
#include <hal.h>

Include dependency graph for systick.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions
void	emerg_delay (uint32_t)
void	systick_init (uint32_t reload_val)
	Initialize and enable SysTick. More...
static void	systick_enable ()
static void	systick_disable ()
static uint64_t	systick_uptime (void)
	Returns the system uptime, in milliseconds. More...
static uint32_t	systick_get_count (void)
	Returns the current value of the SysTick counter. More...
static uint32_t	systick_check_underflow (void)
	Check for underflow. More...
void	systick_attach_callback (Handler callback)
	Attach a callback to be called from the SysTick exception handler. More...
void	systick_detach_callback (Handler callback)
uint32_t	systick_micros (void)
void	SysTick_Handler (void)
void	__attribute__ ((noreturn)) __error(uint32_t pc

Variables
volatile uint64_t	systick_uptime_millis
voidFuncPtr	boardEmergencyHandler
void uint32_t	num
void uint32_t uint32_t	lr
void uint32_t uint32_t uint32_t	flag

Function Documentation

__attribute__()

void __attribute__

(

(noreturn)

)

emerg_delay()

void emerg_delay

(

uint32_t

)

Definition at line 257 of file boards.cpp.

Referenced by __attribute__().

Here is the caller graph for this function:

systick_attach_callback()

void systick_attach_callback

(

Handler

callback

)

Attach a callback to be called from the SysTick exception handler.

To detach a callback, call this function again with a null argument.

Definition at line 28 of file systick.c.

Referenced by systick_check_underflow().

Here is the caller graph for this function:

systick_check_underflow()

static uint32_t systick_check_underflow ( void  )

inlinestatic

Check for underflow.

This function returns 1 if the SysTick timer has counted to 0 since the last time it was called. However, any reads of any part of the SysTick Control and Status Register SYSTICK_BASE->CSR will interfere with this functionality. See the ARM Cortex M3 Technical Reference Manual for more details (e.g. Table 8-3 in revision r1p1).

Definition at line 59 of file systick.h.

Here is the call graph for this function:

systick_detach_callback()

void systick_detach_callback

(

Handler

callback

)

Definition at line 34 of file systick.c.

Referenced by systick_check_underflow().

Here is the caller graph for this function:

systick_disable()

static void systick_disable ( )

inlinestatic

Clock the system timer with the core clock, but don't turn it on or enable interrupt.

Definition at line 39 of file systick.h.

systick_enable()

static void systick_enable ( )

inlinestatic

Clock the system timer with the core clock and turn it on; interrupt every 1 ms, for systick_timer_millis.

Definition at line 33 of file systick.h.

Referenced by systick_init().

Here is the caller graph for this function:

systick_get_count()

static uint32_t systick_get_count ( void  )

inlinestatic

Returns the current value of the SysTick counter.

Definition at line 48 of file systick.h.

SysTick_Handler()

void SysTick_Handler

(

void

)

Definition at line 63 of file systick.c.

Referenced by systick_check_underflow().

Here is the call graph for this function:

Here is the caller graph for this function:

systick_init()

void systick_init

(

uint32_t

reload_val

)

Initialize and enable SysTick.

Clocks the system timer with the core clock, turns it on, and enables interrupts.

Parameters

reload_val

Appropriate reload counter to tick every 1 ms.

Definition at line 50 of file systick.c.

Referenced by init().

Here is the call graph for this function:

Here is the caller graph for this function:

systick_micros()

uint32_t systick_micros

(

void

)

Referenced by systick_check_underflow().

Here is the caller graph for this function:

systick_uptime()

static uint64_t systick_uptime ( void  )

inlinestatic

Returns the system uptime, in milliseconds.

Definition at line 44 of file systick.h.

Referenced by F4Light::Scheduler::_millis(), F4Light::Scheduler::_millis64(), F4Light::PPM_parser::_process_dsm_pulse(), F4Light::PPM_parser::_process_ppmsum_pulse(), F4Light::PPM_parser::_process_sbus_pulse(), Soft_I2C::bus_reset(), i2c_bus_reset(), F4Light::DSM_parser::init(), millis(), pwmIRQHandler(), and F4Light::RCInput::read().

Here is the caller graph for this function:

Variable Documentation

boardEmergencyHandler

voidFuncPtr boardEmergencyHandler

flag

void uint32_t uint32_t uint32_t flag

Definition at line 80 of file systick.h.

Referenced by __cxa_pure_virtual(), Linux::UARTDriver::_parseDevicePath(), dma_attach_interrupt(), posix_fopen_modes_to_open(), AP_HAL::Device::set_read_flag(), SystemCoreClockUpdate(), and systemInit().

lr

void uint32_t uint32_t lr

Definition at line 80 of file systick.h.

Referenced by __cxa_pure_virtual(), SystemCoreClockUpdate(), and systemInit().

num

void uint32_t num

Definition at line 80 of file systick.h.

Referenced by __attribute__(), __cxa_pure_virtual(), Vector2< int32_t >::circle_segment_intersection(), Vector3< int32_t >::distance_to_segment(), exti_attach_interrupt(), exti_attach_interrupt_pri(), exti_detach_interrupt(), exti_enable_interrupt(), exti_serv(), Linux::ToneAlarm::init_tune(), DataFlash_Class::multiplier(), Vector2< int32_t >::operator()(), Vector3< int32_t >::operator()(), Vector2< int32_t >::operator*(), Vector3< int32_t >::operator*(), VectorN< float, N >::operator*(), Matrix3< float >::operator*(), Vector2< int32_t >::operator*=(), Vector3< int32_t >::operator*=(), Matrix3< float >::operator*=(), VectorN< float, N >::operator*=(), Vector2< int32_t >::operator/(), Vector3< int32_t >::operator/(), VectorN< float, N >::operator/(), Matrix3< float >::operator/(), Vector2< int32_t >::operator/=(), Vector3< int32_t >::operator/=(), Matrix3< float >::operator/=(), VectorN< float, N >::operator/=(), F4Light::AnalogIn::power_status_flags(), Linux::ToneAlarm::set_note(), DataFlash_Class::structure(), SystemCoreClockUpdate(), systemInit(), DataFlash_Class::unit(), and USB_OTG_FlushTxFifo().

systick_uptime_millis

volatile uint64_t systick_uptime_millis

System elapsed time, in milliseconds

Referenced by SysTick_Handler(), systick_init(), and systick_uptime().