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[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [April 2010 Threads] Interruption Priority ProblemPosted by GabrielV on April 28, 2010 Hello!
I´m working with the Free RTOS with the PIC32 and i´m triying to use UART RX interruptions to listen to a printer command response, but i´m having the fallowing problem:
The main routine runs the fallowing code:
SYSTEMConfig(GetSystemClock(), SYS_CFG_WAIT_STATES | SYS_CFG_PCACHE); INTEnableSystemMultiVectoredInt();
/*Hardware initialization*/ InitializeBoard();
/*Synchonization objects initialization*/ InitializeSystemObjects();
/*Temporal section with tests of libraries outside of the RTOS environment*/ PrinterDemo(); /***********/
/*Creation of application tasks*/ InitializeTask(); //INTEnableInterrupts(); /* Finally start the scheduler. */ vTaskStartScheduler();
The Interrupt priority for UART RX was 1 and the code executed until a breakpoint in InitializeTask(); but the printer demo, that receives a byte for printer status didnt received anything.
But when I commented the function InitializeSystemObjects(); the I didnt have problems receiving the byte trough RX UART Interruption.
the InitializeSystemObjects() code: { _lcmQueue = xQueueCreate( LCM_TASK_QUEUE_DEEP, sizeof( xLCDMessage )); _actionButtonQueue = xQueueCreate( ACTION_BUTTON_QUEUE_EVENTS_DEEP, sizeof( ActionButtonEvent )); vSemaphoreCreateBinary( _i2C1Semaphore); }
And Finally, if I increment the Interrupt Priority for the RX interruption to 4 it works fine.
Can someone help me with this issue? Why isnt the UART interruption working even when the scheduler didnt started yet and moreover why I have to use such a high priority when I initialize thos system Objects?
Thanks in advance
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