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[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [May 2010 Threads] portYIELD_FROM_ISR + atmega32Posted 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 + atmega32Posted 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.
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