📄 os_cpu_c.c
字号:
/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
* (c) Copyright 2002, Jean J. Labrosse, Weston, FL
* All Rights Reserved
*
*
* PIC24 MPLab Port
*
*
* File : OS_CPU_C.C
* By : Eric Shufro
* Port Version : V2.81 and higher)
*********************************************************************************************************
*/
#include "uCOS_II.H"
/*
*********************************************************************************************************
* LOCALS
*********************************************************************************************************
*/
#if 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_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
/*$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)
{
#if OS_VIEW_MODULE > 0
OSView_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)
{
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
/*
*********************************************************************************************************
* 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
void OSTaskSwHook (void)
{
#if OS_VIEW_MODULE > 0
OSView_TaskSwHook();
#endif
}
#endif
/*
*********************************************************************************************************
* 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
/*
*********************************************************************************************************
* 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
void OSTimeTickHook (void)
{
#if OS_VIEW_MODULE > 0
// OSView_TickHook();
#endif
#if OS_TMR_EN > 0
OSTmrCtr++;
if (OSTmrCtr >= (OS_TICKS_PER_SEC / OS_TMR_CFG_TICKS_PER_SEC)) {
OSTmrCtr = 0;
OSTmrSignal();
}
#endif
}
#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) : 1) You may pass a task creation parameters through the opt variable. You MUST only use the
* upper 8 bits of 'opt' because the lower bits are reserved by uC/OS-II. If you make
* changes to the code below, you will need to ensure that it doesn't affect the behaviour
* of OSTaskIdle() and OSTaskStat().
* 2) Registers are initialized to make them easy to differentiate with a debugger.
*********************************************************************************************************
*/
OS_STK *OSTaskStkInit( void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt) {
INT16U x;
INT8U pc_high;
pc_high = (INT8U)(((INT32U)task >> 16) & 0x7F);
*ptos++ = (OS_STK)task; /* Simulate a call to the task by putting 32 bits of data */
*ptos++ = (OS_STK)pc_high; /* data on the stack. */
/* Simulate an interrupt */
*ptos++ = (OS_STK)task; /* Put the address of this task on the stack (PC) */
x = 0; /* Set the SR to enable ALL interrupts */
if (CORCONbits.IPL3) { //tbh080510 /* Check the CPU's current interrupt level 3 bit */
x |= 0x0080; /* If set, then save the priority level bit in x bit [7] */
}
*ptos++ = (OS_STK)(x | (INT16U)pc_high); /* Push the SR Low, CORCON IPL3 and PC (22..16) */
*ptos++ = pdata; /* Initialize register W0 */
*ptos++ = 0x1111; /* Initialize register W1 */
*ptos++ = 0x2222; /* Initialize register W2 */
*ptos++ = 0x3333; /* Initialize register W3 */
*ptos++ = 0x4444; /* Initialize register W4 */
*ptos++ = 0x5555; /* Initialize register W5 */
*ptos++ = 0x6666; /* Initialize register W6 */
*ptos++ = 0x7777; /* Initialize register W7 */
*ptos++ = 0x8888; /* Initialize register W8 */
*ptos++ = 0x9999; /* Initialize register W9 */
*ptos++ = 0xAAAA; /* Initialize register W10 */
*ptos++ = 0xBBBB; /* Initialize register W11 */
*ptos++ = 0xCCCC; /* Initialize register W12 */
*ptos++ = 0xDDDD; /* Initialize register W13 */
*ptos++ = 0xEEEE; /* Initialize register W14 */
*ptos++ = TBLPAG; /* Push the Data Table Page Address on to the stack */
*ptos++ = PSVPAG; /* Push the Program Space Visability Register on the stack */
*ptos++ = RCOUNT; /* Push the Repeat Loop Counter Register on to the stack */
*ptos++ = 0; /* Push 0 for the SR to ensure all interrupts are enabled */
*ptos++ = CORCON; /* Push the Core Control Register on to the stack */
return ptos; /* Return the stack pointer to the new tasks stack */
}
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -