[Timer API]

 void vTimerSetTimerID( TimerHandle_t xTimer, void *pvNewID );

An identifier (ID) is assigned to a software timer when the timer is created, and can be changed at any time using the vTimerSetTimerID() API function.

If the same callback function is assigned to multiple timers, the timer identifier can be inspected inside the callback function to determine which timer actually expired.

The timer identifier can also be used to store data in the timer between calls to the timer’s callback function.

xTimer   The timer being updated.
pvNewID   The handle to which the timer’s identifier will be set.
Example usage:

/* A callback function assigned to a timer. */
void TimerCallbackFunction( TimerHandle_t pxExpiredTimer )
uint32_t ulCallCount;

    /* A count of the number of times this timer has expired
    and executed its callback function is stored in the
    timer's ID.  Retrieve the count, increment it, then save
    it back into the timer's ID. */
    ulCallCount =
        ( uint32_t ) pvTimerGetTimerID( pxExpiredTimer );
    vTimerSetTimerID( pxExpiredTimer, ( void * ) ulCallCount );

Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News

FreeRTOS v10.2.1 is available for immediate download. MIT licensed, includes 64-bit RISC-V, NXP Cortex-M33 demo & Nuvoton Cortex-M23 demo & STM32H745 dual core (AMP) demo.

New Updates to MIT licensed IoT MQTT and POSIX libraries are now available. New library IoT HTTPS is available.  Includes demo projects.

View a recording of the “OTA Update Security and Reliability” webinar, presented by TI and AWS.


FreeRTOS and other embedded software careers at AWS.

FreeRTOS Partners
ARM Connected RTOS partner for all ARM microcontroller cores
Espressif ESP32
IAR Partner
Microchip Premier RTOS Partner
STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0
Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers
OpenRTOS and SafeRTOS
Xilinx Microblaze and Zynq partner