os_cpu_c.c
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上传日期:2017-01-28
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- /*
- *********************************************************************************************************
- * uC/OS-II
- * The Real-Time Kernel
- *
- *
- * (c) Copyright 2006, Micrium, Weston, FL
- * All Rights Reserved
- *
- * ARM Cortex-M3 Port
- *
- * File : OS_CPU_C.C
- * Version : V2.86
- * By : Jean J. Labrosse
- *
- * For : ARMv7M Cortex-M3
- * Mode : Thumb2
- * Toolchain : RealView Development Suite
- * RealView Microcontroller Development Kit (MDK)
- * ARM Developer Suite (ADS)
- * Keil uVision
- *********************************************************************************************************
- */
- #define OS_CPU_GLOBALS
- #include <ucos_ii.h>
- /*
- *********************************************************************************************************
- * LOCAL VARIABLES
- *********************************************************************************************************
- */
- #if OS_TMR_EN > 0
- static INT16U OSTmrCtr;
- #endif
- /*
- *********************************************************************************************************
- * SYS TICK DEFINES
- *********************************************************************************************************
- */
- #define OS_CPU_CM3_NVIC_ST_CTRL (*((volatile INT32U *)0xE000E010)) /* SysTick Ctrl & Status Reg. */
- #define OS_CPU_CM3_NVIC_ST_RELOAD (*((volatile INT32U *)0xE000E014)) /* SysTick Reload Value Reg. */
- #define OS_CPU_CM3_NVIC_ST_CURRENT (*((volatile INT32U *)0xE000E018)) /* SysTick Current Value Reg. */
- #define OS_CPU_CM3_NVIC_ST_CAL (*((volatile INT32U *)0xE000E01C)) /* SysTick Cal Value Reg. */
- #define OS_CPU_CM3_NVIC_ST_CTRL_COUNT 0x00010000 /* Count flag. */
- #define OS_CPU_CM3_NVIC_ST_CTRL_CLK_SRC 0x00000004 /* Clock Source. */
- #define OS_CPU_CM3_NVIC_ST_CTRL_INTEN 0x00000002 /* Interrupt enable. */
- #define OS_CPU_CM3_NVIC_ST_CTRL_ENABLE 0x00000001 /* Counter mode. */
- /*
- *********************************************************************************************************
- * 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_TMR_EN > 0
- OSTmrCtr = 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
- /*
- *********************************************************************************************************
- * 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)
- {
- #if OS_APP_HOOKS_EN > 0
- App_TaskCreateHook(ptcb);
- #else
- (void)ptcb; /* Prevent compiler warning */
- #endif
- }
- #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)
- {
- #if OS_APP_HOOKS_EN > 0
- App_TaskDelHook(ptcb);
- #else
- (void)ptcb; /* Prevent compiler warning */
- #endif
- }
- #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)
- {
- #if OS_APP_HOOKS_EN > 0
- App_TaskIdleHook();
- #endif
- }
- #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)
- {
- #if OS_APP_HOOKS_EN > 0
- App_TaskStatHook();
- #endif
- }
- #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
- *
- * 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
- * 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_xxx).
- *
- * 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) All tasks run in Thread mode, using process stack.
- *********************************************************************************************************
- */
- OS_STK *OSTaskStkInit (void (*task)(void *p_arg), void *p_arg, OS_STK *ptos, INT16U opt)
- {
- OS_STK *stk;
- (void)opt; /* 'opt' is not used, prevent warning */
- stk = ptos; /* Load stack pointer */
- /* Registers stacked as if auto-saved on exception */
- *(stk) = (INT32U)0x01000000L; /* xPSR */
- *(--stk) = (INT32U)task; /* Entry Point */
- *(--stk) = (INT32U)0xFFFFFFFEL; /* R14 (LR) (init value will cause fault if ever used)*/
- *(--stk) = (INT32U)0x12121212L; /* R12 */
- *(--stk) = (INT32U)0x03030303L; /* R3 */
- *(--stk) = (INT32U)0x02020202L; /* R2 */
- *(--stk) = (INT32U)0x01010101L; /* R1 */
- *(--stk) = (INT32U)p_arg; /* R0 : argument */
- /* Remaining registers saved on process stack */
- *(--stk) = (INT32U)0x11111111L; /* R11 */
- *(--stk) = (INT32U)0x10101010L; /* R10 */
- *(--stk) = (INT32U)0x09090909L; /* R9 */
- *(--stk) = (INT32U)0x08080808L; /* R8 */
- *(--stk) = (INT32U)0x07070707L; /* R7 */
- *(--stk) = (INT32U)0x06060606L; /* R6 */
- *(--stk) = (INT32U)0x05050505L; /* R5 */
- *(--stk) = (INT32U)0x04040404L; /* R4 */
- return (stk);
- }
- /*
- *********************************************************************************************************
- * 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)
- {
- #if OS_APP_HOOKS_EN > 0
- App_TaskSwHook();
- #endif
- }
- #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)
- {
- #if OS_APP_HOOKS_EN > 0
- App_TCBInitHook(ptcb);
- #else
- (void)ptcb; /* Prevent compiler warning */
- #endif
- }
- #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_APP_HOOKS_EN > 0
- App_TimeTickHook();
- #endif
- #if OS_TMR_EN > 0
- OSTmrCtr++;
- if (OSTmrCtr >= (OS_TICKS_PER_SEC / OS_TMR_CFG_TICKS_PER_SEC)) {
- OSTmrCtr = 0;
- OSTmrSignal();
- }
- #endif
- }
- #endif
- /*
- *********************************************************************************************************
- * OS_CPU_SysTickHandler()
- *
- * Description: Handle the system tick (SysTick) interrupt, which is used to generate the uC/OS-II tick
- * interrupt.
- *
- * Arguments : none.
- *
- * Note(s) : 1) This function MUST be placed on entry 15 of the Cortex-M3 vector table.
- *********************************************************************************************************
- */
- void OS_CPU_SysTickHandler (void)
- {
- OS_CPU_SR cpu_sr;
- OS_ENTER_CRITICAL(); /* Tell uC/OS-II that we are starting an ISR */
- OSIntNesting++;
- OS_EXIT_CRITICAL();
- OSTimeTick(); /* Call uC/OS-II's OSTimeTick() */
- OSIntExit(); /* Tell uC/OS-II that we are leaving the ISR */
- }
- /*
- *********************************************************************************************************
- * OS_CPU_SysTickInit()
- *
- * Description: Initialize the SysTick.
- *
- * Arguments : none.
- *
- * Note(s) : 1) This function MUST be called after OSStart() & after processor initialization.
- *********************************************************************************************************
- */
- void OS_CPU_SysTickInit (void)
- {
- INT32U cnts;
- cnts = OS_CPU_SysTickClkFreq() / OS_TICKS_PER_SEC;
- OS_CPU_CM3_NVIC_ST_RELOAD = (cnts - 1);
- /* Enable timer. */
- OS_CPU_CM3_NVIC_ST_CTRL |= OS_CPU_CM3_NVIC_ST_CTRL_CLK_SRC | OS_CPU_CM3_NVIC_ST_CTRL_ENABLE;
- /* Enable timer interrupt. */
- OS_CPU_CM3_NVIC_ST_CTRL |= OS_CPU_CM3_NVIC_ST_CTRL_INTEN;
- }