|
|
|
| tnkernel-coldfire-1-0.zip |
|
This
ZIP archive contains:
|
|
| |
- A TNKernel for Freescale ColdFire port source code
- An examples source code for the Freescale ColdFire MCF52231 MCU
- A projects for the Freescale CodeWarrior 7.1 and IAR ColdFire v.1.22 compilers
|
|
|
1. Hardware specifics
With a ColdFire V2 core, TNKernel uses PIT0
timer as system timer source.
TNKernel operates in a supervisor mode.
2.Nested interrupts
TNKernel for ColdFire supports nested interrupts.
To recognize a nested interrupt condition, a two macros are used:
A function tn_inside_int() uses status register SR flags
(but only after the system’s start):
3.Context switching with ColdFire CPU
With ColdFire core, TNKernel uses a software
interrupt (TRAP #10) to request context switch.
It makes the system context switch similar for
both interrupts context switch and regular tasks context switch and simplifies a register
save/restore procedure.
For a MCF52231 CPU with EMAC
support, the EMAC registers saving/loading
routine is included into context switch procedure.
4.Examples
A TNKernel port for ColdFire core comes with 3 examples:
|
1.
|
tn_cw_1
|
A reference performance calculation - empty OS without user tasks (for CodeWarrrior compiler only).
|
|
2.
|
tn_cw_2
tn_iar_2
|
A base OS functionality (tasks, UART, etc) (for CodeWarrrior compiler and
IAR ColdFire compiler). The project settings for IAR
contains a ‘Simulator’ as the target,
but output code has been tested in the CPU (it was loaded into the CPU
FLASH by the CodeWarrior flash programmer).
|
|
3.
|
tn_cw_3
|
A full-feature hi-speed UART support with TxD DMA and RxD DMA (includes semaphores,
queues, fixed-sized memory pools) (for CodeWarrrior compiler only).
|
|
