Timer

Table of Contents

• Features Supported
• Features NOT Supported
• Important Usage Guidelines
• Example Usage
• API

Features Supported

• APIs to setup timer configuration
• APIs to start and stop the timer
• APIs to get the current timer count
• APIs to check for counter overflow and clear timer overflow interrupt

Features NOT Supported

NA

Important Usage Guidelines

• Supports continues and oneshot mode
• When configuring the timer period in micro second the 'periodInNsec' should be set to 0

Attention

Timer(TIMER2) is used for the system tick functionality in c7x is also availbale to uses as a timer peripheral for a53 core. Hence use TIMER2 for single purpose either system tick functionality in c7x or timer peripheral for a53 core

Example Usage

Include the below file to access the APIs,

#include <kernel/dpl/TimerP.h>

Example usage to initialize the timer

    TimerP_Params timerParams;
    /* setup timer but dont start it */
    TimerP_Params_init(&timerParams);
    timerParams.inputPreScaler    = 1u;
    timerParams.inputClkHz        = 250u*1000u*1000u;
    timerParams.periodInUsec      = 10u*1000u;
    timerParams.oneshotMode       = 0;
    timerParams.enableOverflowInt = 1;
    TimerP_setup(timerBaseAddr, &timerParams);

Example usage to start the timer

    /* start the tick timer */
    TimerP_start(timerBaseAddr);

Example usage to get the current count value

    uint32_t count;
 
    /* start the tick timer */
    count = TimerP_getCount(timerBaseAddr);
    (void) count; /* kill warning of variable set but not used */

Example usage to stop the timer

    /* stop the tick timer */
    TimerP_stop(timerBaseAddr);

API

APIs for timer setup and control