📄 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
* (c) Copyright ARM Limited 1999. All rights reserved.
*
* ARM Specific code
*
*
* File : OS_CPU_C.C
*
* Modification : 21/08/00 EL
*********************************************************************************************************
*/
#define OS_CPU_GLOBALS
#include "includes.h"
#include "44b.h"
#include "44blib.h"
#include "uhal.h"
/*
*********************************************************************************************************
* 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)
{
}
#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
*
* 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!
*********************************************************************************************************
*/
#if OS_VERSION >= 251
OS_STK *OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
#else
void *OSTaskStkInit (void (*task)(void *pd), void *pdata, void *ptos, INT16U opt)
#endif
{
unsigned int *stk ;
opt = opt; /* 'opt' is not used, prevent warning */
stk = (unsigned int *)ptos; /* Load stack pointer */
/* build a context for the new task */
*--stk = (unsigned int) task; /* pc */
*--stk = (unsigned int) task; /* lr */
*--stk = 0; /* r12 */
*--stk = 0; /* r11 */
*--stk = 0; /* r10 */
*--stk = 0; /* r9 */
*--stk = 0; /* r8 */
*--stk = 0; /* r7 */
*--stk = 0; /* r6 */
*--stk = 0; /* r5 */
*--stk = 0; /* r4 */
*--stk = 0; /* r3 */
*--stk = 0; /* r2 */
*--stk = 0; /* r1 */
*--stk = (unsigned int) pdata; /* r0 */
*--stk = (SVC32MODE|0x0); /* cpsr IRQ, FIQ disable*/
*--stk = (SVC32MODE|0x0); /* spsr IRQ, FIQ disable */
return ((void *)stk);
}
/*
*********************************************************************************************************
* OSTCBInit() 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
/*$PAGE*/
#if OS_CPU_HOOKS_EN
/*
*********************************************************************************************************
* 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)
{
}
/*
*********************************************************************************************************
* TICK HOOK
*
* Description: This function is called every tick. It is currently unused, therefore commented out
* in OS_CORE
*
* Arguments : none
*
* Note(s) : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
void OSTimeTickHook (void)
{
}
#endif
/* Initialize an ARM Target board */
void ARMTargetInit(void)
{
rSYSCFG=CACHECFG; // Using 8KB Cache
Uart_Select(0); // Select UART0
sys_init(); /* Initial 44B0X's Interrupt,Port and UART */
/* ---- Tell the world who we are ---------------------------------- */
// print To UART0
uHALr_printf("\n*==================================*\n");
uHALr_printf("*= Embest Corporation =*\n");
uHALr_printf("*==================================*\n");
uHALr_printf("*========== R&D Center ==========*\n");
uHALr_printf("*===== support@embedinfo.com ======*\n");
uHALr_printf("*=== OS Version:%d ===*\n\r",OSVersion());
uHALr_printf(" uCOS-II Running... \n") ;
/* ---- disable the MMU ------------------------------------- */
//uHALr_ResetMMU();
/* ---- disable interrupts (IRQs) --------------------------------- */
ARMDisableInt();
/* Define pre & post-process routines for Interrupt */
uHALir_DefineIRQ((void *)IrqStart, (void *)IrqFinish, (void *) 0);
uHALr_InitInterrupts();
uHALr_InitTimers();
} /* targetInit */
/* start the ARM target running */
void ARMTargetStart(void)
{
/* request the system timer */
if (uHALr_RequestSystemTimer((void *) OSTimeTick,
(const unsigned char *)"uCOS-II") <= 0)
uHALr_printf("Timer/IRQ busy\n");
/* Start system timer & enable the interrupt. */
uHALr_InstallSystemTimer();
SysENInterrupt(BIT_TIMER0|BIT_EINT4567);
}
extern void IRQContextSwap(void); /* post DispatchIRQ processing (the _real_ one) */
/* just 'notice' that we need to change context [called in OSIntExit]*/
int need_to_swap_context = 0 ;
void OSIntCtxSw(void)
{
need_to_swap_context = 1;
}
/* This is what uCOS does at the start of an IRQ */
void IrqStart(void)
{
/* increment nesting counter */
OSIntNesting++;
}
/* This is what uCOS does at the end of an IRQ */
void *IrqFinish(void)
{
OSIntExit() ;
if (need_to_swap_context)
{
need_to_swap_context = 0 ;
return ((void *)IRQContextSwap);
}
else
{
return (void *)0;
}
}
void UserIRQ0(void)
{
SysDISInterrupt(BIT_GLOBAL); // avoid interrupt nesting
rI_ISPC = BIT_EINT4567; //clear pending_bit
rEXTINTPND = 0xf; //clear EXTINTPND reg.
//OSIntEnter() ;
uHALr_printf("*======= 86-755-25631365 ========*\n");
//Eint4567Isr();
SysENInterrupt(BIT_GLOBAL);
//OSIntExit() ;
}
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