Quality RTOS & Embedded Software

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


Loading

Interruption Priority Problem

Posted 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


[ 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.

Meet Richard Barry and learn about running FreeRTOS on RISC-V at FOSDEM 2019

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.


Careers

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

Renesas

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