Quality RTOS & Embedded Software

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


Code Warrior Banked Freescale HCs12

Posted by Phil Wolstencroft on August 27, 2010
In the Port.c file where the 'pxPortInitialiseStack' function is defined, the value for the CCR, (line 152), should be changed to 0x40 from 0.

Setting the CCR to zero enables the XIRQ.

If the XIRQ functionality is wanted it would be more appropriate to enable it specifically somewhere else, since it is a one time operation and once enabled cannot be turned of again until a reset is performed.


RE: Code Warrior Banked Freescale HCs12

Posted by Dave on August 27, 2010
Sounds like a good thing to add to the feature request tracker. I know its not a feature request but it will allow it to get added to the todo list (doesn't mean it will actually get done, but it won't get lost).

RE: Code Warrior Banked Freescale HCs12

Posted by Phil Wolstencroft on August 29, 2010
I'll do that.

We should also consider the STOP instruction control bit (bit 8 of the CCR).
The current initialization code turns it on as well, however it is possible to turn the it off again under s/ware control.
If the default initialization code keeps it turned off then each task must turn it on if it is wanted.

To keep it turned off by default, the CCR should be initialized to 0xC0.


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

Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2016 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.

Latest News:

FreeRTOS V9.0.0 is now available for download.

Free TCP/IP and file system demos for the RTOS

Sponsored Links

⇓ Now With No Code Size Limit! ⇓
⇑ Free Download Without Registering ⇑

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Renesas Electronics Gold Alliance RTOS Partner.jpg

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Atmel RTOS partner supporting ARM Cortex-M3 and AVR32 microcontrollers

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Xilinx Microblaze and Zynq partner

Silicon Labs low power RTOS partner

Altera RTOS partner for Nios II and Cortex-A9 SoC

Freescale Alliance RTOS Member supporting ARM and ColdFire microcontrollers

Infineon ARM Cortex-M microcontrollers

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

Cypress RTOS partner supporting ARM Cortex-M3

Fujitsu RTOS partner supporting ARM Cortex-M3 and FM3

Microsemi (previously Actel) RTOS partner supporting ARM Cortex-M3

Atollic Partner

IAR Partner

Keil ARM Partner

Embedded Artists