SysHwTimer.c File Reference

Hardware dependent timer module for Atmel AVR. More...

Go to the source code of this file.

Macros
#define	USE_TIMER_0
#define	TIMER_INT_VECT_COMP   TIMER0_COMP_vect

Functions
void	HwTimerInit (void)
	Initialize the hardware time. More...
uint32_t	HwTimerGetValue (void)
	Get the value of globalTimer variable guarded by disable/enable interrupts. More...
	ISR (TIMER_INT_VECT_COMP)
	Interrupt service routine for timer interrupt. More...

Variables
static uint32_t	ulGlobalTimer = 0
	Gets incremented every TIMER_RESOLUTION_MS milliseconds by interrupt. More...

Detailed Description

Hardware dependent timer module for Atmel AVR.

Supplies a tick count.

History:

• 2002-12-14 sb:Stolen idea and prototypes from TD. and implemented Atmel AVR version.
• 2002-01-01 sb:Another version that now supports either Timer 0 or Timer 2 (ATmega only!)
• 2002-01-05 sb:Make HwTimerGetValue() atomic.
• 2007-01-01 ba: Copied from sb HwTimer and modified to get a timertick of 1mS as precise as possible. For a first step we use Timer0 in outputcapture- mode. The function names have not been changed for ease of use with sb timer.h
• 2007-01-20 ba: Added declarations and functions for FREMOClock
• 2007-02-11 ba: Added code for generation of pulses for clock line
• 2007-02-25 ba: Removed all specific functions and code. Only PushButton and SysTimerUserInterupt are called. All user specific code should be added in
• 2008-03-16 ba: Fixed error in Timercomparevalue 250->249
• 2015-04-24 StS: Remove unnecessary whitespace and change to unified format

Version

$Id: SysHwTimer.c 159 2016-09-03 06:51:47Z pischky $

Author

Stefan Bormann

Bernd Wisotzki

Definition in file SysHwTimer.c.

Macro Definition Documentation

#define TIMER_INT_VECT_COMP   TIMER0_COMP_vect

Definition at line 78 of file SysHwTimer.c.

#define USE_TIMER_0

Definition at line 55 of file SysHwTimer.c.

Function Documentation

uint32_t HwTimerGetValue

(

void

)

Get the value of globalTimer variable guarded by disable/enable interrupts.

Returns

the value of globalTimer

Definition at line 210 of file SysHwTimer.c.

void HwTimerInit

(

void

)

Initialize the hardware time.

Called from main before interrupts are enabled .

Definition at line 115 of file SysHwTimer.c.

ISR

(

TIMER_INT_VECT_COMP

)

Interrupt service routine for timer interrupt.

Runs with global interrupts disabled.

Definition at line 223 of file SysHwTimer.c.

Here is the call graph for this function:

Variable Documentation

uint32_t ulGlobalTimer = 0

static

Gets incremented every TIMER_RESOLUTION_MS milliseconds by interrupt.

Read by other parts of the program with HwTimerGetValue.

Definition at line 89 of file SysHwTimer.c.