Quality RTOS & Embedded Software

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




Loading

portYIELD_FROM_ISR + atmega32

Posted by zvonko on May 12, 2010
hi, this is the sample code from freertos website
, how do i use portYIEED_FROM_ISR with atmega32, i cant find this macro in the portable code,
or can i just use taskYIELD() macro inside an ISR ?


/* Timer ISR */
void vTimerISR( void * pvParameters )
{
static unsigned portCHAR ucLocalTickCount = 0;
static signed portBASE_TYPE xHigherPriorityTaskWoken;

/* A timer tick has occurred. */

... Do other time functions.

/* Is it time for vATask() to run? */
xHigherPriorityTaskWoken = pdFALSE;
ucLocalTickCount++;
if( ucLocalTickCount >= TICKS_TO_WAIT )
{
/* Unblock the task by releasing the semaphore. */
xSemaphoreGiveFromISR( xSemaphore, &xHigherPriorityTaskWoken );

/* Reset the count so we release the semaphore again in 10 ticks time. */
ucLocalTickCount = 0;
}

/* If xHigherPriorityTaskWoken was set to true you
we should yield. The actual macro used here is
port specific. */
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}

RE: portYIELD_FROM_ISR + atmega32

Posted by Richard on May 12, 2010
portYIELD_FROM_ISR() does not exist for the 8 bit AVR - hence you cannot find it. You can use taskYIELD() directly, but only as the last instruction in an interrupt handler.

Take a look at the SIGNAL( SIG_UART_RECV ) function in FreeRTOS/Demo/AVR_ATMega323_WinAVR/serial/serial.c for a GCC example. Alternatively take a look at __interrupt void SIG_UART_RECV( void ) in FreeRTOS/Demo/AVR_ATMega323_IAR/serial/serial.c for an IAR example.

Regards.


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




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

Latest News

FreeRTOS kernel V10 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