Quality RTOS & Embedded Software

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


Loading

AVR32 Semaphore Scheduler Problem

Posted by Markus Groh on September 25, 2010
Hi!

I'm relatively new to FreeRTOS. I'm using an Atmel AVR MCU (UC3A0512) on the EVK1100 Evaluation Board. Actually I'm making my first experiences in mutitasking. So I have a serious problem I'm not able to solve :(

I use an GPIO-Interrupt wich evokes an ISR. This ISR works fine (traced it via usart debugging messages). This ISR 'gives' an Semaphore (binary) with
xSemaphoreGiveFromISR(gpiointerrupt,&xHighPriorityTaskWoken);

This evokes a high priority task which blocks for this semaphore. I also traced this behavior via usart. This Semaphore was taken, code executes, task wants again take the semaphore....and then everything crashed. The MCU stops, no lower tasks resumed.
Has anybody a tip or a solution for my problem? Something I'm making wrong, but after a lot of tests I didn't find a solution and it irks me.

Thanks a lot!

RE: AVR32 Semaphore Scheduler Problem

Posted by Markus Groh on September 26, 2010
Ok, I solved my problem. It was an error in the function protoype of the ISR.

I simply forgot the compiler attribute for the AVR-port

__attribute__ ((naked))

Now, everything works fine.


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




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

Latest News

Meet us at Embedded World. Hall 3A-525.

Hear from Richard Barry at Embedded World. Feb 28, 16:00, Hall 4-428.

Video: Watch James Gosling & Richard Barry at re:Invent, Las Vegas 2017.

FreeRTOS kernel V10.0.1 is available for immediate download. Now MIT licensed.


FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

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