Quality RTOS & Embedded Software

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


ColdFire V2, Edge Port Module, Supervisor Mod

Posted by David Towery on July 10, 2011
Hi, I have a naive question that I can't answer myself because my dev board blew up and I'm waiting on a new one. I'm completely new to programming ColdFires at the register level, and I'm trying to antipicate a problem that may crop up.

I'm coding for the M52221Demo board (FreeScale ColdFire V2 MCF52221) and I need to configure a couple of IRQ lines in the EdgePort module. According to the FreeScale manual, the following registers can only be accessed in Supervisor mode:
EPPAR (pin assignment reg), EPDDR (data direction reg), EPIER (interrupt enable reg).
The demo code for the 52221 doesn't illustrate any use of IRQs. How do I best access these registers to configure the IRQ lines? Do I have to set Supervisor Mode? If so, does FreeRTOS provide any easy way to do this? If not, I guess I have to mess with the System Control Module -- can anyone summarize the steps I need to take there to enter and exit Supervisor mode? Any example code (or just pointers to the best sections to read in the 52221 Ref Manual) would be appreciated.

RE: ColdFire V2, Edge Port Module, Supervisor Mod

Posted by David Towery on July 10, 2011
I just answered my own question. I should have read further down the documentation page for the 52221Demo board. All tasks run with supervisor privileges anyway (thank goodness!), so it's not an issue.

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

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

Latest News

FreeRTOS v10.2.0 is available for immediate download. MIT licensed, and including RISC-V and ARMv8-M (Cortex-M33) demos.

NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.

View a recording of the "OTA Update Security and Reliability" webinar, presented by TI and AWS.


FreeRTOS and other embedded software careers at AWS.

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Cadence Tensilica Cortes

Espressif ESP32

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

Xilinx Microblaze and Zynq partner