Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem


Timing methods

Posted by Nobody/Anonymous on August 18, 2005
I would like to be able to set a pin high for a certain amount of time and then set it low at the end of the specified time.

I am using an ATmega128 chip and I would like to be able to obtain this pulsing of the bit without doing inline assembly code. I didn't see a specific timer function in the RTOS and my only thought as far as being able to do some timing with the RTOS was to set the bit and then delay the task that turned the bit off for a certain amount of ticks. This would provide some measure of timing, but not the most accurate, and it does not seem the best way. If anybody has any suggestions, please let me know.


RE: Timing methods

Posted by Nobody/Anonymous on August 19, 2005
What sort of frequency do you require? You can just set one of the timer output peripherals on the chip to do this with no software overhead. If low frequency then you could also use a timer interrupt (just like the RTOS tick).

RE: Timing methods

Posted by Nobody/Anonymous on August 19, 2005
The internal clock on the chip runs at 14.7456 MHz. I want to be able to do timing in milliseconds.

Yah, I had it pointed out to me that I should just check into the timers on the chip. I will do that.

Thanks for the help,

[ Back to the top ]    [ About FreeRTOS ]    [ Privacy ]    [ Sitemap ]    [ ]

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

Latest News

NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.

Version 10.1.1 of the FreeRTOS kernel is available for immediate download. MIT licensed.

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

RTOS partner of NXP for all NXP ARM microcontrollers


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