Encapsulates the ARM sysTick counter, which is used for computing delays. ARM-core specific function that enables the ARM systick timer on Kinetis uCs. the timer is 24 bit so allows measurement of intervals up to 2^24/CORE_SYSTICK_HZ secs=0.35s for a 48MHz uC. More...

#include "issdk_hal.h"

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Macros
#define	SYST_CSR SysTick->CTRL

#define	SYST_RVR SysTick->LOAD

#define	SYST_CVR SysTick->VAL

Functions
void	SysTick_Handler (void)

uint32_t	SysTick_GetOVFCount (void)

void	BOARD_SystickEnable (void)
	Function to enable systicks framework. More...

void	BOARD_SystickStart (int32_t *pStart)
	Function to Record the Start systick. More...

int32_t	BOARD_SystickElapsedTicks (int32_t *pStart)
	Function to compute the Elapsed systicks. More...

uint32_t	BOARD_SystickElapsedTime_us (int32_t *pStart)
	Function to compute the Elapsed Time. More...

void	BOARD_DELAY_ms (uint32_t delay_ms)
	Function to insert delays. More...

Variables
uint32_t	g_ovf_stamp

volatile uint32_t	g_ovf_counter = 0

Detailed Description

Encapsulates the ARM sysTick counter, which is used for computing delays. ARM-core specific function that enables the ARM systick timer on Kinetis uCs. the timer is 24 bit so allows measurement of intervals up to 2^24/CORE_SYSTICK_HZ secs=0.35s for a 48MHz uC.

Definition in file systick_utils.c.

Macro Definition Documentation

◆ SYST_CSR

#define SYST_CSR SysTick->CTRL

Definition at line 45 of file systick_utils.c.

Referenced by BOARD_SystickEnable().

◆ SYST_CVR

#define SYST_CVR SysTick->VAL

Definition at line 47 of file systick_utils.c.

Referenced by BOARD_SystickElapsedTicks(), and BOARD_SystickStart().

◆ SYST_RVR

#define SYST_RVR SysTick->LOAD

Definition at line 46 of file systick_utils.c.

Referenced by BOARD_SystickElapsedTicks(), and BOARD_SystickEnable().

Function Documentation

◆ BOARD_DELAY_ms()

void BOARD_DELAY_ms ( uint32_t delay_ms )

Function to insert delays.

This function blocks for the specified milli seconds by using the elapsed systicks to determine time delays.

Parameters

[in] delay_ms The required time to block.

Returns: void.

Constraints:: None. Yes

Definition at line 116 of file systick_utils.c.

References BOARD_SystickElapsedTicks(), BOARD_SystickStart(), and int32_t().

Referenced by ADS_DetectShield(), ADS_MMA9553Query(), DIFF_P_I2C_Initialize(), DIFF_P_SPI_Initialize(), FXLC95000_SPI_Initialize(), FXLS8962_I2C_DeInit(), FXLS8962_SPI_Deinit(), MMA9553_I2C_Initialize(), MMA9553_SPI_Initialize(), Sensor_I2C_BlockWrite(), and Sensor_SPI_BlockWrite().

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◆ BOARD_SystickElapsedTicks()

int32_t BOARD_SystickElapsedTicks ( int32_t * pStart )

Function to compute the Elapsed systicks.

This function computes the elapsed ticks by getting the difference of the current tick to the one in the arguement.

Parameters

[in] pStart Pointer to the variable contating the start systick.

Returns: int32_t The elapsed systicks.

Constraints:: None. Yes

Definition at line 87 of file systick_utils.c.

References g_ovf_stamp, int32_t(), SYST_CVR, SYST_RVR, and SysTick_GetOVFCount().

Referenced by BOARD_DELAY_ms(), and BOARD_SystickElapsedTime_us().

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◆ BOARD_SystickElapsedTime_us()

uint32_t BOARD_SystickElapsedTime_us ( int32_t * pStart )

Function to compute the Elapsed Time.

This function computes the elapsed Time in micro seconds by getting the difference of the current tick to the one in the arguement. It also updates the start tick to the current systick.

Parameters

[in] pStart Pointer to the variable contating the start systick.