?? os_cpu_c.c
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/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
* ATmega128 Specific code for V2.8x
*
* File : OS_CPU_C.C
* By : Xiawei <xiawei0311@gmail.com>
* AVR-GCC version : 4.1.1 , WinAVR 20070122
* Date : September 9th,2007
*********************************************************************************************************
*/
#define OS_CPU_GLOBALS
#include <avr/io.h>
#include "os_cpu.h"
#include "os_cfg.h"
#include "ucos_ii.h"
/*
*********************************************************************************************************
* LOCAL GLOBAL VARIABLES
*********************************************************************************************************
*/
#if OS_VERSION >= 281 && OS_TMR_EN > 0
static INT16U OSTmrCtr;
#endif
/*
*********************************************************************************************************
* 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_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void OSInitHookBegin (void)
{
#if OS_VERSION >= 281 && OS_TMR_EN > 0
OS_CPU_TmrCtr = 0;
#endif
}
#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_CPU_HOOKS_EN > 0 && 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 > 0
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 > 0
void OSTaskDelHook (OS_TCB *ptcb)
{
ptcb = ptcb; /* Prevent compiler warning */
}
#endif
/*
*********************************************************************************************************
* 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_CPU_HOOKS_EN > 0 && OS_VERSION >= 251
void OSTaskIdleHook (void)
{
}
#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 > 0
void OSTaskStatHook (void)
{
}
#endif
/*$PAGE*/
/*
**********************************************************************************************************
* 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
*
* p_arg 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 the
* highest valid address on 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
* SREG to 0x00 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!
*
* The AVR return stack is placed OS_TASK_HARD_STK_SIZE bytes before the bottom of the task's
* stack.
*
* (1) IMPORTANT: The ICC compiler handles function pointers by actually passing the pointer
* to a location in Flash that actually contains the pointer to the function.
*
* (2) IMPORTANT: You MUST set OSTaskStkSize and OSTaskStkSizeHard BEFORE calling OSInit()
* to initialize the Idle and statistic tasks stacks.
**********************************************************************************************************
*/
OS_STK *OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
OS_STK* stk;
opt=opt;/*廢物,防止編譯器報警*/
stk=ptos;/*得到棧頂指針*/
*stk-- = (INT8U)(((INT16U)task)&0xFF);
*stk-- = (INT8U)(((INT16U)task)>>8);
*stk-- = (INT8U)0x00; /* R0 = 0x00 */
*stk-- = (INT8U)0x01; /* R1 = 0x00 */
*stk-- = (INT8U)0x02; /* R2 = 0x00 */
*stk-- = (INT8U)0x03; /* R3 = 0x00 */
*stk-- = (INT8U)0x04; /* R4 = 0x00 */
*stk-- = (INT8U)0x05; /* R5 = 0x00 */
*stk-- = (INT8U)0x06; /* R6 = 0x00 */
*stk-- = (INT8U)0x07; /* R7 = 0x00 */
*stk-- = (INT8U)0x08; /* R8 = 0x00 */
*stk-- = (INT8U)0x09; /* R9 = 0x00 */
*stk-- = (INT8U)0x10; /* R10 = 0x00 */
*stk-- = (INT8U)0x11; /* R11 = 0x00 */
*stk-- = (INT8U)0x12; /* R12 = 0x00 */
*stk-- = (INT8U)0x13; /* R13 = 0x00 */
*stk-- = (INT8U)0x14; /* R14 = 0x00 */
*stk-- = (INT8U)0x15; /* R15 = 0x00 */
*stk-- = (INT8U)0x16; /* R16 = 0x00 */
*stk-- = (INT8U)0x17; /* R17 = 0x00 */
*stk-- = (INT8U)0x18; /* R18 = 0x00 */
*stk-- = (INT8U)0x19; /* R19 = 0x00 */
*stk-- = (INT8U)0x20; /* R20 = 0x00 */
*stk-- = (INT8U)0x21; /* R21 = 0x00 */
*stk-- = (INT8U)0x22; /* R22 = 0x00 */
*stk-- = (INT8U)0x23; /* R23 = 0x00 */
*stk-- = (INT8U)(((INT16U)pdata)&0xFF); /* Simulate call to function with argument */
*stk-- = (INT8U)(((INT16U)pdata)>>8); /* R24, R25 contains argument pointer pdata */
*stk-- = (INT8U)0x26; /* R26 = 0x00 */
*stk-- = (INT8U)0x27; /* R27 = 0x00 */
*stk-- = (INT8U)0x28; /* R28 = 0x00 */
*stk-- = (INT8U)0x29; /* R29 = 0x00 */
*stk-- = (INT8U)0x30; /* R30 = 0x00 */
*stk-- = (INT8U)0x31; /* R31 = 0x00 */
*stk-- = (INT8U)0x80; /* SREG = Interrupts enabled */
return ((OS_STK *)stk);
}
/*$PAGE*/
/*
*********************************************************************************************************
* 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 > 0) && (OS_TASK_SW_HOOK_EN > 0)
void OSTaskSwHook (void)
{
}
#endif
/*
*********************************************************************************************************
* OS_TCBInit() HOOK
*
* Description: This function is called by OS_TCBInit() 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 > 0 && 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 > 0) && (OS_TIME_TICK_HOOK_EN > 0)
void OSTimeTickHook (void)
{
#if OS_VERSION >= 281 && OS_TMR_EN > 0
OSTmrCtr++;
if (OSTmrCtr >= (OS_TICKS_PER_SEC / OS_TMR_CFG_TICKS_PER_SEC)) {
OSTmrCtr = 0;
OSTmrSignal();
}
#endif
}
#endif
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