📄 os_cpu_c.c
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/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
* (c) Copyright 1992-2003, Jean J. Labrosse, Weston, FL
* All Rights Reserved
*
* ZiLOG eZ80-Specific code
*
* File : OS_CPU_C.C
* By : Jean J. Labrosse
* Revised : Douglas Beattie Jr., ICONIX Research (30-MAY-2003)
* Port Version : v1.00 (for uC/OS-II V2.52 or higher)
* By : Douglas Beattie Jr. <beattidp@ieee.org>
*********************************************************************************************************
*/
#define OS_CPU_GLOBALS
#ifndef OS_MASTER_FILE
#include "includes.h"
#endif
/*
*********************************************************************************************************
* 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) : 1) Interrupts are enabled when your task starts executing.
* 2) The IAR compiler would pass 'pdata' in the DE register pair if the task function was
* called by another function.
*********************************************************************************************************
*/
OS_STK *OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
OS_STK *stk;
//opt = opt; /* 'opt' is not used, prevent compiler warning */
stk = (OS_STK *)ptos; /* Load stack pointer */
/* ------- SIMULATE CALL TO FUNCTION WITH ARGUMENT ------- */
*--stk = (OS_STK)pdata; /* argument */
*--stk = (OS_STK)task; /* Save task address */
/* ----------------- SETUP STACK FRAME ------------------- */
*--stk = (OS_STK)task; /* Saved PC from ISR (Simulated) */
/* Primary registers: */
*--stk = (OS_STK)0x001100; /* AF */
*--stk = (OS_STK)0x222222; /* BC */
*--stk = (OS_STK)0x333333; /* DE */
*--stk = (OS_STK)0x444444; /* HL */
/* Alternate registers: */
*--stk = (OS_STK)0x555555; /* AF */
*--stk = (OS_STK)0x666666; /* BC */
*--stk = (OS_STK)0x777777; /* DE */
*--stk = (OS_STK)0x888888; /* HL */
*--stk = (OS_STK)0x999999; /* IX */
*--stk = (OS_STK)0xAAAAAA; /* IY */
return ((OS_STK *)stk); /* --------------- RETURN NEW TOP OF STACK --------------- */
}
/*$PAGE*/
/*
*********************************************************************************************************
* OS INITIALIZATION HOOK
* (BEGINNING)
*
* Description: This function is called by OSInit() at the beginning of OSInit().
*
* Arguments : none
*
* Note(s) : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN && OS_VERSION > 203
void OSInitHookBegin (void)
{
}
#endif
/*
*********************************************************************************************************
* OS INITIALIZATION HOOK
* (END)
*
* Description: This function is called by OSInit() at the end of OSInit().
*
* Arguments : none
*
* Returns : none
*
* Note(s) :
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN && OS_VERSION > 203
void OSInitHookEnd (void)
{
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* 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.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN
void OSTaskCreateHook (OS_TCB *ptcb)
{
ptcb = ptcb; /* Prevent compiler warning */
}
#endif
/*
*********************************************************************************************************
* 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.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN
void OSTaskDelHook (OS_TCB *ptcb)
{
ptcb = ptcb; /* Prevent compiler warning */
}
#endif
/*
*********************************************************************************************************
* 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).
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN
void OSTaskSwHook (void)
{
//putch('.');
}
#endif
/*
*********************************************************************************************************
* 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
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN
void OSTaskStatHook (void)
{
}
#endif
/*
*********************************************************************************************************
* 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_CPU_HOOKS_EN && 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.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN
void OSTimeTickHook (void)
{
}
#endif
/*
*********************************************************************************************************
* IDLE HOOK
*
* Description: This function is called by idle task when no other higher
* priority task is ready to run; can be used to force the
* processor into low-power mode (for battery products), to
* conserver energy when no other tasks need to be serviced.
*
* Arguments : none
*
* Note(s) : 1) Interrupts should be ENABLED during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN
void OSTaskIdleHook (void)
{
/* put the CPU into low-power mode */
/* do nothing for now */
/* we can also put L.E.D. toggle test code here,
to verify initial bring-up of the system */
}
#endif
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