📄 os_cpu_c.c
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/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
* (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
* All Rights Reserved
*
*
*
* File : OS_CPU_C.C
* By : Lorenzo Altieri AltieriL@ee.nec.de
*********************************************************************************************************
*/
/*
*********************************************************************************************************
Company : NEC Elecronics GmbH
Title : OS CPU C code MODULE
Description : RTOS kernel (hardware-specific) functions
File : OS_CPU_A.asm
Type : compiler Green Hills
Library :
Author : Lorenzo Altieri AltieriL@ee.nec.de
Comments :
Revisions :
Version : (Version) (dd/mm/yy) changes
x.xx ddmmyy Create file
0.01 09/03/2004
*********************************************************************************************************
*/
#define OS_CPU_GLOBALS
#include <os_cpu.h>
#include <os_cfg.h>
#include <ucos_ii.h>
//#include "Inc\df3239.h" /* if you want to use some I/O for debugging pouposes */
//#include "Inc\type.h"
//#include "Inc\df3239extIO.h"
/*
*********************************************************************************************************
* INITIALIZE A TASK'S STACK
*
* Description: This function is called by either OSTaskCreate() or OSTaskCreateExt() to initialize the
* stack frame of the task being created. This function is highly processor specific.
*
* Arguments : task is a pointer to the task code
*
* pdata is a pointer to a user supplied data area that will be passed to the task
* when the task first executes.
*
* ptos is a pointer to the top of stack. It is assumed that 'ptos' points to
* a 'free' entry on the task stack. If OS_STK_GROWTH is set to 1 then
* 'ptos' will contain the HIGHEST valid address of the stack. Similarly, if
* OS_STK_GROWTH is set to 0, the 'ptos' will contains the LOWEST valid address
* of the stack.
*
* opt specifies options that can be used to alter the behavior of OSTaskStkInit().
* (see uCOS_II.H for OS_TASK_OPT_???).
*
* Returns : Always returns the location of the new top-of-stack' once the processor registers have
* been placed on the stack in the proper order.
*
* Note(s) : Interrupts are enabled when your task starts executing. You can change this by setting the
* PSW to 0x0002 instead. In this case, interrupts would be disabled upon task startup. The
* application code would be responsible for enabling interrupts at the beginning of the task
* code. You will need to modify OSTaskIdle() and OSTaskStat() so that they enable
* interrupts. Failure to do this will make your system crash!
*********************************************************************************************************
*/
OS_STK *OSTaskStkInit(void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
INT32U *stk;
opt = opt; /* 'opt' is not used, prevent warning */
stk = (INT32U *)ptos; /* Load stack pointer */
stk = (INT32U *)ptos; /* Load stack pointer */
*(--stk) = (INT32U) ptos; /* task stack pointer */
*(--stk) = (INT32U) 0x00000000; /* Task PSW = Interrupts disabled */
*(--stk) = (INT32U) task; /* Task's PC code */
*(--stk) = (INT32U) 0x31313131; /* r31 Link pointer */
*(--stk) = (INT32U) 0x30303030; /* r30 */
*(--stk) = (INT32U) 0x29292929; /* r29 */
*(--stk) = (INT32U) 0x28282828; /* r28 Frame pointer/permanent/ */
*(--stk) = (INT32U) 0x27272727; /* r27 */
*(--stk) = (INT32U) 0x26262626; /* r26 */
*(--stk) = (INT32U) 0x25252525; /* r25 */
*(--stk) = (INT32U) 0x24242424; /* r24 */
*(--stk) = (INT32U) 0x23232323; /* r23 */
*(--stk) = (INT32U) 0x22222222; /* r22 */
*(--stk) = (INT32U) 0x21212121; /* r21 */
*(--stk) = (INT32U) 0x20202020; /* r20 */
*(--stk) = (INT32U) 0x19191919; /* r19 */
*(--stk) = (INT32U) 0x18181818; /* r18 */
*(--stk) = (INT32U) 0x17171717; /* r17 */
*(--stk) = (INT32U) 0x16161616; /* r16 */
*(--stk) = (INT32U) 0x15151515; /* r15 */
*(--stk) = (INT32U) 0x14141414; /* r14 */
*(--stk) = (INT32U) 0x13131313; /* r13 */
*(--stk) = (INT32U) 0x12121212; /* r12 */
*(--stk) = (INT32U) 0x11111111; /* r11 */
*(--stk) = (INT32U) 0x10101010; /* r10 Function return value/temporary */
*(--stk) = (INT32U) 0x09090909; /* r9 Parameters */
*(--stk) = (INT32U) 0x08080808; /* r8 Parameters */
*(--stk) = (INT32U) 0x07070707; /* r7 Parameters */
*(--stk) = (INT32U) 0x06060606; /* r6 Parameters */
*(--stk) = (INT32U) 0x05050505; /* r5 Temporary or Rosda base */
*(--stk) = (INT32U) 0x02020202; /* r2 Temporary*/
*(--stk) = (INT32U) 0x01010101; /* r1 Address generation in compiler and assembler*/
return ((OS_STK *)stk);
}
/*$PAGE*/
#if OS_CPU_HOOKS_EN
/*
*********************************************************************************************************
* OS INITIALIZATION HOOK
* (BEGINNING)
*
* Description: This function is called by OSInit() at the beginning of OSInit().
*
* Arguments : none
*
* Note(s) : 1) Interrupts should be disabled during this call.
*********************************************************************************************************
*/
#if OS_VERSION > 204
void OSInitHookBegin (void)
{
}
#endif
/*
*********************************************************************************************************
* OS INITIALIZATION HOOK
* (END)
*
* Description: This function is called by OSInit() at the end of OSInit().
*
* Arguments : none
*
* Note(s) : 1) Interrupts should be disabled during this call.
*********************************************************************************************************
*/
#if OS_VERSION > 203
void OSInitHookEnd (void)
{
}
#endif
/*
*********************************************************************************************************
* TASK CREATION HOOK
*
* Description: This function is called when a task is created.
*
* Arguments : ptcb is a pointer to the task control block of the task being created.
*
* Note(s) : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
void OSTaskCreateHook(OS_TCB *ptcb)
{
ptcb = ptcb; /* Prevent compiler warning */
}
/*
*********************************************************************************************************
* TASK DELETION HOOK
*
* Description: This function is called when a task is deleted.
*
* Arguments : ptcb is a pointer to the task control block of the task being deleted.
*
* Note(s) : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
void OSTaskDelHook (OS_TCB *ptcb)
{
ptcb = ptcb; /* Prevent compiler warning */
}
/*
*********************************************************************************************************
* TASK SWITCH HOOK
*
* Description: This function is called when a task switch is performed. This allows you to perform other
* operations during a context switch.
*
* Arguments : none
*
* Note(s) : 1) Interrupts are disabled during this call.
* 2) It is assumed that the global pointer 'OSTCBHighRdy' points to the TCB of the task that
* will be 'switched in' (i.e. the highest priority task) and, 'OSTCBCur' points to the
* task being switched out (i.e. the preempted task).
*********************************************************************************************************
*/
void OSTaskSwHook (void)
{
}
/*
*********************************************************************************************************
* STATISTIC TASK HOOK
*
* Description: This function is called every second by uC/OS-II's statistics task. This allows your
* application to add functionality to the statistics task.
*
* Arguments : none
*********************************************************************************************************
*/
void OSTaskStatHook (void)
{
// P5=P5 ^ 0x02; I/O for debugging pouposes */
}
/*
*********************************************************************************************************
* OSTCBInit() HOOK
*
* Description: This function is called by OSTCBInit() after setting up most of the TCB.
*
* Arguments : ptcb is a pointer to the TCB of the task being created.
*
* Note(s) : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
#if OS_VERSION > 203
void OSTCBInitHook (OS_TCB *ptcb)
{
ptcb = ptcb; /* Prevent Compiler warning */
}
#endif
/*
*********************************************************************************************************
* TICK HOOK
*
* Description: This function is called every tick.
*
* Arguments : none
*
* Note(s) : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
void OSTimeTickHook (void)
{
// P5=P5 ^ 0x04; I/O for debugging pouposes */
// BuzzerSound(); /* Process buzzer ticks */
}
/*
*********************************************************************************************************
* IDLE TASK HOOK
*
* Description: This function is called by the idle task. This hook has been added to allow you to do
* such things as STOP the CPU to conserve power.
*
* Arguments : none
*
* Note(s) : 1) Interrupts are enabled during this call.
*********************************************************************************************************
*/
#if OS_VERSION >= 251
void OSTaskIdleHook (void)
{
}
#endif
#endif
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