uCOS移植代码 for 8051

2008-6-27 09:28:14 6433

0 uCOS移植代码 for 8051 OS_CPU_C.C /* ******************************************************************************** * 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 * os_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! ******************************************************************************** / / at89c55wd PDL(sp form LOW to HIGH)： (堆栈指针所指的栈顶数据为有效数据) 装入堆栈指针ptos到stkstk--> 入栈：task底高 (高内存) 入 \|\| 入栈：ACC 栈 \|\| 入栈：B 顺 \|\| 入栈：DPH //暂时忽略第二指针序 \|\| 入栈：DPL \| / \| 入栈：PSW \| \| 入栈：R7- R4 \|______\| 入栈：os_pdata(R3,R2,R1)用寄存器传递os_pdata 入栈：R0 (底内存) // 入栈： DPS?? //双数据指针选择寄存器?? // 入栈：PC 自己应该参照编译器定义入栈/出栈顺序，写出来备以后查阅 / OS_STK OSTaskStkInit (void (task)(void pd)LG_REENTRANT, void os_pdata, OS_STK ptos, INT16U opt) LG_REENTRANT { //INT16U stk; OS_STK stk; opt = opt; /* 'opt' is not used, prevent warning / stk = (OS_STK )ptos; /* Load stack pointer / //装入堆栈指针ptos到stk stk = 0; //入栈：R0 stk -= sizeof(void ); (void *)stk = (void )os_pdata; //用寄存器传递 os_pdata --stk = 4; //入栈：R4-R7 --stk = 5; --stk = 6; --stk = 7; --stk = PSW; //入栈：PSW --stk = 'L'; //入栈：DPL --stk = 'H'; //入栈：DPH //暂时忽略第二指针 --stk = 'B'; //入栈：B --stk = 'A'; //入栈：ACC --stk = ((INT16U)task & 0xff00) >> 8; //保存任务地址 --stk = (INT16U)task & 0x00ff; --stk = 15; //入栈个数 //END return ((OS_STK )stk); } /$PAGE/ / ******************************************************************************** * INITIALIZE A TASK'S STACK FOR FLOATING POINT EMULATION ******************************************************************************** / /$PAGE/ //void OSTaskStkInit_FPE_x86 (OS_STK pptos, OS_STK ppbos, INT32U psize) //{ //} /$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 void OSTaskSwHook (void) LG_REENTRANT { } #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) LG_REENTRANT { 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) LG_REENTRANT { } #endif / ****************************************************************************** *********************** * 中断服务程序外挂 * NOTE : 注意:所有中断外挂都在临界区之外,用户可以自行控制进/退临界区 ******************************************************************************** / #if OS_ISR_T1_EN > 0 void OSISR_T1HOOK (void) LG_REENTRANT { / 请在这里输入中断服务程序 / } #endif #if OS_ISR_INT0_EN > 0 void OSISR_INT0HOOK (void) LG_REENTRANT { / 请在这里输入中断服务程序 / } #endif #if OS_ISR_INT1_EN > 0 void OSISR_INT1HOOK (void) LG_REENTRANT { / 请在这里输入中断服务程序 / } #endif #if OS_ISR_S0_EN > 0 void OSISR_S0HOOK (void) LG_REENTRANT { / 请在这里输入中断服务程序 / } #endif ---------------- **************************************************************************** ********************* uC/OS-II The Real-Time Kernel (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL All Rights Reserved at89c55wd Specific code LARGE MEMORY MODEL keil C/C++ V7.2 (at89c55wd Compatible Target) File : OS_CPU_A.ASM By : Jean J. Labrosse Port by : 牛毅 2005-04-25->2005-04-28 QQ:75011221 niuyimail@126.com 修补 : 2005-05-02-01:30 (增加了中断管理和临界区宏) 修补 : 2005-05-16-13:00 (修补_CopySPtoC_XBP的漏洞, 有标记处%%%%????%%%%%%) *************************************************************************** ********************* #include "OS_CFG.H" NAME OS_CPU_A *************************************************************************** ********************* 要使用的外部函数和公共数据 *************************************************************************** ********************* EXTRN CODE (_?OSIntExit) EXTRN CODE (_?OSTimeTick) EXTRN CODE (_?OSTaskSwHook) IF OS_ISR_T1_EN <> 0 EXTRN CODE (_?OSISR_T1HOOK) ENDIF IF OS_ISR_INT0_EN <> 0 EXTRN CODE (_?OSISR_INT0HOOK) ENDIF IF OS_ISR_INT1_EN <> 0 EXTRN CODE (_?OSISR_INT1HOOK) ENDIF IF OS_ISR_S0_EN <> 0 EXTRN CODE (_?OSISR_S0HOOK) ENDIF EXTRN DATA (?C_XBP) DT?C_XBP SEGMENT DATA RSEG DT?C_XBP ?C_XBP: C_XBP: DS 1 ?STACK SEGMENT IDATA RSEG ?STACK ?STACK: Stack: DS 40 EXTRN BIT (OSRunning) EXTRN XDATA (OSIntNesting) EXTRN XDATA (OSTickDOSCtr) EXTRN XDATA (OSPrioHighRdy) EXTRN XDATA (OSPrioCur) EXTRN XDATA (OSTCBCur) EXTRN XDATA (OSTCBHighRdy) *************************************************************************** ********************* MACRO DEFINE *************************************************************************** ********************* PUSHALL MACRO PUSH PC PUSH ACC PUSH B PUSH DPH PUSH DPL PUSH PSW IRP REG, MOV A, REG PUSH ACC ENDM ENDM POPALL MACRO IRP REG, POP ACC MOV REG, A ENDM POP PSW POP DPL POP DPH POP B POP ACC RET/RETI ENDM OS_ENTER_CRITICAL MACRO MOV B,IE ;因为所有程序没有使用 B寄存器,所以使用了B寄存器作为IE暂存 CLR EA ENDM OS_EXIT_CRITICAL MACRO MOV IE,B ;因为所有程序没有使用 B寄存器,所以使用了B寄存器作为IE暂存 ENDM *************************************************************************** ********************* 供外部使用的函数 *************************************************************************** *********************** PUBLIC _?OSTickISR PUBLIC _?OSStartHighRdy PUBLIC _?OSCtxSw PUBLIC _?OSIntCtxSw /$PAGE/ ***************************************************************************** ********************* 函数体段 *************************************************************************** ********************* *************************************************************************** ********************** 用户中断程序区之定时器中断 1 OSISR_T1() *************************************************************************** ********************** IF OS_ISR_T1_EN <> 0 CSEG AT 001BH ;设置T0中断向量 LJMP _OSISR_T1 ?PR?_OSISR_T1?OS_CPU_A SEGMENT CODE RSEG ?PR?_OSISR_T1?OS_CPU_A _OSISR_T1: OS_ENTER_CRITICAL (1)保存处理器寄存器先PUSH到SP在COPY到?C_XBP PUSHALL LCALL _CopySPtoC_XBP ;COPY SP 的内容到? C_XBP (2)记忆中断的嵌套层OSIntNesting++ 进入中断 (3) if (OSIntNesting == 1) OSTCBCur->OSTCBStkPtr <= ?C_XBP LCALL _Enter_INT OS_EXIT_CRITICAL (4)调用中断服务外挂 LCALL _?OSISR_T1HOOK ;在这里进行中断服务 OS_ENTER_CRITICAL (5) Call OSTimeTick(); LCALL _?OSTimeTick (6) Call OSIntExit(); LCALL _?OSIntExit (7) 恢复处理器寄存器 ;没有高优先级任务在就绪队列中 LCALL _ComCtxSw2 LCALL _CopyC_XBPtoSP POPALL OS_EXIT_CRITICAL RETI ENDIF *************************************************************************** ********************** 用户中断程序区之外部中断0 OSISR_INT0() *************************************************************************** ********************** IF OS_ISR_INT0_EN <> 0 CSEG AT 0003H ;设置T0中断向量 LJMP _OSISR_INT0 ?PR?_OSISR_INT0?OS_CPU_A SEGMENT CODE RSEG ?PR?_OSISR_INT0?OS_CPU_A _OSISR_INT0: OS_ENTER_CRITICAL (1)保存处理器寄存器先PUSH到SP在COPY到?C_XBP PUSHALL LCALL _CopySPtoC_XBP ;COPY SP 的内容到? C_XBP (2)记忆中断的嵌套层OSIntNesting++ 进入中断 (3) if (OSIntNesting == 1) OSTCBCur->OSTCBStkPtr <= ?C_XBP LCALL _Enter_INT OS_EXIT_CRITICAL (4)调用中断服务外挂 LCALL _?OSISR_INT0HOOK ;在这里进行中断服务 OS_ENTER_CRITICAL (5) Call OSTimeTick(); LCALL _?OSTimeTick (6) Call OSIntExit(); LCALL _?OSIntExit (7) 恢复处理器寄存器 ;没有高优先级任务在就绪队列中 LCALL _ComCtxSw2 LCALL _CopyC_XBPtoSP POPALL OS_EXIT_CRITICAL RETI ENDIF *************************************************************************** ********************** 用户中断程序区之外部中断1 OSISR_INT1() *************************************************************************** ********************** IF OS_ISR_INT1_EN <> 0 CSEG AT 0013H ;设置T0中断向量 LJMP _OSISR_INT1 ?PR?_OSISR_INT1?OS_CPU_A SEGMENT CODE RSEG ?PR?_OSISR_INT1?OS_CPU_A _OSISR_INT1: OS_ENTER_CRITICAL (1)保存处理器寄存器先PUSH到SP在COPY到?C_XBP PUSHALL LCALL _CopySPtoC_XBP ;COPY SP 的内容到? C_XBP (2)记忆中断的嵌套层OSIntNesting++ 进入中断 (3) if (OSIntNesting == 1) OSTCBCur->OSTCBStkPtr <= ?C_XBP LCALL _Enter_INT OS_EXIT_CRITICAL (4)调用中断服务外挂 LCALL _?OSISR_INT1HOOK ;在这里进行中断服务 OS_ENTER_CRITICAL (5) Call OSTimeTick(); LCALL _?OSTimeTick (6) Call OSIntExit(); LCALL _?OSIntExit (7) 恢复处理器寄存器 ;没有高优先级任务在就绪队列中 LCALL _ComCtxSw2 LCALL _CopyC_XBPtoSP POPALL OS_EXIT_CRITICAL RETI ENDIF *************************************************************************** ********************** 用户中断程序区之串口中断0 OSISR_S0() *************************************************************************** ********************** IF OS_ISR_S0_EN <> 0 CSEG AT 0023H ;设置T0中断向量 LJMP _OSISR_S0 ?PR?_OSISR_S0?OS_CPU_A SEGMENT CODE RSEG ?PR?_OSISR_S0?OS_CPU_A _OSISR_S0: OS_ENTER_CRITICAL (1)保存处理器寄存器先PUSH到SP在COPY到?C_XBP PUSHALL LCALL _CopySPtoC_XBP ;COPY SP 的内容到? C_XBP (2)记忆中断的嵌套层OSIntNesting++ 进入中断 (3) if (OSIntNesting == 1) OSTCBCur->OSTCBStkPtr <= ?C_XBP LCALL _Enter_INT OS_EXIT_CRITICAL (4)调用中断服务外挂 LCALL _?OSISR_S0HOOK ;在这里进行中断服务 OS_ENTER_CRITICAL (5) Call OSTimeTick(); LCALL _?OSTimeTick (6) Call OSIntExit(); LCALL _?OSIntExit (7) 恢复处理器寄存器 ;没有高优先级任务在就绪队列中 LCALL _ComCtxSw2 LCALL _CopyC_XBPtoSP POPALL OS_EXIT_CRITICAL RETI ENDIF *************************************************************************** ********************** START MULTITASKING void OSStartHighRdy(void) LG_REENTRANT 出栈后就意味着启动了第一个任务 The stack frame is assumed to look as follows: 出 / 出栈：task 底高 (高内存) 栈 \|\| 出栈：ACC 顺 \|\| 出栈：B 序 \|\| 出栈：DPH //暂时忽略第二指针 \| \|\| \| 出栈：DPL \| \| 出栈：PSW \|______________\| 出栈：R7-R4 出栈： os_pdata(R3,R2,R1)用寄存器传递os_pdata OSTCBHighRdy->OSTCBStkPtr --> 出栈：R0 (底内存) Note : OSStartHighRdy() MUST: a) Call OSTaskSwHook() then, b) Set OSRunning to TRUE, c) Switch to the highest priority task. *************************************************************************** ********************** ?PR?_?OSStartHighRdy?OS_CPU_A SEGMENT CODE 第3个问号表示重入函数 RSEG ?PR?_?OSStartHighRdy?OS_CPU_A ;函数体段 _?OSStartHighRdy: USING 0 OS_ENTER_CRITICAL LCALL _?OSTaskSwHook ;调用OSTaskSwHook(); SETB OSRunning ;OSRunning= TRUE; 切换到最高优先级的任务 JMP CtxSw ;MOV ?C_XBP,0 *************************************************************************** ********************** PERFORM A CONTEXT SWITCH (From task level) void OSCtxSw(void) Note(s): 1) Upon entry, OSTCBCur points to the OS_TCB of the task to suspend OSTCBHighRdy points to the OS_TCB of the task to resume 2) The stack frame of the task to suspend looks as follows: SP -> OFFSET of task to suspend (Low memory) SEGMENT of task to suspend PSW of task to suspend (High memory) 3) The stack frame of the task to resume looks as follows: 出 / 用RET 出栈：task底高地址 (高内存) 栈 \|\| 出栈：ACC 顺 \|\| 出栈：B 序 \|\| 出栈：DPH //暂时忽略第二指针 \| \|\| \| 出栈：DPL \| \| 出栈：PSW \|______________\| 出栈：R0 出栈：os_pdata (R1,R2,R3)用寄存器传递os_pdata OSTCBHighRdy->OSTCBStkPtr --> 出栈：R4-R7 (底内存) Flags to load in PSW (High memory) 任务级切换： 1:PUSHALL 2:?C_BXP<=(SP) 3:OSTCBCur->OSTCBStkPtr<=?C_BXP 4: ... 5:?C_BXP<=OSTCBHighRdy->OSTCBStkPtr 6:(SP)<=?C_BXP 7:POPALL 8:RET *************************************************************************** ************************ ?PR?_?OSCtxSw?OS_CPU_A SEGMENT CODE RSEG ?PR?_?OSCtxSw?OS_CPU_A _?OSCtxSw: USING 0 OS_ENTER_CRITICAL (1)保存处理器的寄存器 PUSHALL (2)拷贝SP(系统)堆栈中的内容到?C_XBP， SP 满向上然后清空它(即MOV SP,#?STACK-1) ?C_XBP 满向下 LCALL _CopySPtoC_XBP ;COPY SP 的内容到? C_XBP (3)在当前任务的任务控制块中保存当前任务(旧任务)的堆栈指针 OSTCBCur->OSTCBStkPtr=?C_XBP MOV DPH,#HIGH(OSTCBCur) MOV DPL, #LOW(OSTCBCur) INC DPTR ;指针是3字节的把我害死了 MOVX A,@DPTR MOV R1,A INC DPTR MOVX A,@DPTR MOV DPH,R1 MOV DPL,A INC DPTR ;指针是3字节的把我害死了 MOV A,?C_XBP MOVX @DPTR,A INC DPTR MOV A,?C_XBP+1 MOVX @DPTR,A IntCtxSw: (4)调用OSTaskSwHook(); (5)OSTCBCur = OSTCBHighRdy; (6)OSPrioCur = OSPrioHighRdy; LCALL _ComCtxSw1 (7)得到将要重新开始运行的任务(新任务)的堆栈指针 ?C_XBP = OSTCBHighRdy->OSTCBStkPtr;(0x0217) (8)拷贝原任务(新任务)中的?C_XBP到SP(系统)堆栈中 SP 满向上然后清空它(即?C_XBP中的原堆栈内容) ?C_XBP 满向下 CtxSw: LCALL _ComCtxSw2 LCALL _CopyC_XBPtoSP (9)从新任务堆栈中恢复处理器所有寄存器的值 POPALL OS_EXIT_CRITICAL (10)执行返回指令 SETB EA ;强行开中断!!!!!! RET /$PAGE/ ***************************************************************************** ********************** PERFORM A CONTEXT SWITCH (From an ISR) void OSIntCtxSw(void) ;中断级切换:在OSInExit()中已判断了有高优先级的任务在就绪队列中,所以直接切换到高优先级任务 *************************************************************************** ********************** ?PR?_?OSIntCtxSw?OS_CPU_A SEGMENT CODE RSEG ?PR?_?OSIntCtxSw?OS_CPU_A _?OSIntCtxSw: USING 0 OS_ENTER_CRITICAL ACALL _IntRETI JMP IntCtxSw _IntRETI: RETI *************************************************************************** ********************** HANDLE TICK ISR *************************************************************************** ********************** CSEG AT 000BH ;设置T0中断向量 LJMP _?OSTickISR ?PR?_?OSTickISR?OS_CPU_A SEGMENT CODE RSEG ?PR?_?OSTickISR?OS_CPU_A _?OSTickISR: USING 0 CLR EA (1)保存处理器寄存器先PUSH到SP在COPY到?C_XBP OSTCBHighRdy PUSHALL LCALL _CopySPtoC_XBP ;COPY SP 的内容到? C_XBP (2)记忆中断的嵌套层OSIntNesting++ 进入中断 (3) if (OSIntNesting == 1) OSTCBCur->OSTCBStkPtr <= ?C_XBP LCALL _Enter_INT (4)Clear inter CLR TR0 ;TR0;清中断 (5)[TH0,TL0]<= New Value MOV TH0,#3CH ;TH0=0x3ch; MOV TL0,#0B0H ;TL0=0x0b0h; SETB TR0 MOV P1,0 (6) Call OSTimeTick(); LCALL _?OSTimeTick (7) Call OSIntExit(); LCALL _?OSIntExit (8) 恢复处理器寄存器 ;没有高优先级任务在就绪队列中 LCALL _ComCtxSw2 LCALL _CopyC_XBPtoSP POPALL SETB EA (9) 执行中断返回指令 RETI *************************************************************************** *********************** 内部函数 : ComCtxSw1() ;(4)调用OSTaskSwHook(); ;(5)OSTCBCur = OSTCBHighRdy; ;(6)OSPrioCur = OSPrioHighRdy; *************************************************************************** *********************** ?PR?_ComCtxSw1?OS_CPU_A SEGMENT CODE RSEG ?PR?_ComCtxSw1?OS_CPU_A _ComCtxSw1: 调用OSTaskSwHook(); LCALL _?OSTaskSwHook ;中断是关着的 OSTCBCur = OSTCBHighRdy; MOV DPH,#HIGH(OSTCBHighRdy) MOV DPL, #LOW(OSTCBHighRdy) MOVX A,@DPTR MOV R3,A INC DPTR MOVX A,@DPTR MOV R2,A INC DPTR MOVX A,@DPTR MOV R1,A MOV DPH,#HIGH(OSTCBCur) MOV DPL, #LOW(OSTCBCur) MOV A,R3 MOVX @DPTR,A INC DPTR MOV A,R2 MOVX @DPTR,A INC DPTR MOV A,R1 MOVX @DPTR,A OSPrioCur = OSPrioHighRdy; MOV DPH,#HIGH(OSPrioHighRdy) MOV DPL, #LOW(OSPrioHighRdy) MOVX A,@DPTR MOV R7,A MOV DPH,#HIGH(OSPrioCur) MOV DPL, #LOW(OSPrioCur) MOV A,R7 MOVX @DPTR,A RET *************************************************************************** 内部函数 : ComCtxSw2() ;(7)得到将要重新开始运行的任务(新任务)的堆栈指针 ;?C_XBP = OSTCBHighRdy->OSTCBStkPtr;(0x0217) *************************************************************************** ?PR?_ComCtxSw2?OS_CPU_A SEGMENT CODE RSEG ?PR?_ComCtxSw2?OS_CPU_A _ComCtxSw2: POP ACC ;因为函数调用而调整 SP,并保存到R1,R2 MOV R1,ACC POP ACC MOV R2,ACC 得到将要重新开始运行的任务(新任务)的堆栈指针 C_XBP = OSTCBHighRdy->OSTCBStkPtr;(0x0217) MOV DPH,#HIGH(OSTCBCur) ;结构:OSTCBHighRdy- >OSTCBStkPtr{[][H][L]}->?C_XBP MOV DPL, #LOW(OSTCBCur) INC DPTR ;跳过指针类型编号 MOVX A,@DPTR INC DPTR MOV R3,A ;读出高字节为了得到新任务的任务栈指针 MOVX A,@DPTR ;读出底字节 MOV DPH,R3 MOV DPL,A INC DPTR MOVX A,@DPTR MOV ?C_XBP,A INC DPTR MOVX A,@DPTR MOV ?C_XBP+1,A MOV ACC,R2 ;从R1,R2中恢复SP PUSH ACC MOV ACC,R1 PUSH ACC RET *************************************************************************** 内部函数 : CopyC_XBPtoSP() ?C_XBP => SP ;拷贝原任务(新任务)中的?C_XBP到SP(系统)堆栈中 SP 满向上 ;然后清空它(即?C_XBP中的原堆栈内容) ?C_XBP 满向下 *************************************************************************** ?PR?_CopyC_XBPtoSP?OS_CPU_A SEGMENT CODE RSEG ?PR?_CopyC_XBPtoSP?OS_CPU_A _CopyC_XBPtoSP: OSTCBHighRdy POP ACC ;因为函数调用而调整 SP,并保存到R1,R2 MOV R1,ACC POP ACC MOV R2,ACC MOV DPH,?C_XBP MOV DPL,?C_XBP+1 MOVX A,@DPTR MOV R7,A ;读出SP栈元素的总数 MOV SP,#?STACK-1 COPYCXBP_TO_SP: ;拷贝?C_XBP的内容到SP中 INC DPTR MOVX A,@DPTR PUSH ACC DJNZ R7,COPYCXBP_TO_SP INC DPTR MOV A,DPH MOV ?C_XBP,A MOV A,DPL MOV ?C_XBP+1,A MOV ACC,R2 ;从R1,R2中恢复SP PUSH ACC MOV ACC,R1 PUSH ACC RET *************************************************************************** 内部函数 : CopySPtoC_XBP() ?C_XBP <= SP ;(2)拷贝SP(系统)堆栈中的内容到?C_XBP， SP 满向上 ;然后清空它(即MOV SP,#?STACK-1) ?C_XBP 满向下 *************************************************************************** ?PR?_CopySPtoC_XBP?OS_CPU_A SEGMENT CODE RSEG ?PR?_CopySPtoC_XBP?OS_CPU_A _CopySPtoC_XBP: ;OSTCBHighRdy POP ACC ;因为函数调用而调整 SP,并保存到R1,R2 MOV R1,ACC POP ACC MOV R2,ACC MOV DPH,?C_XBP MOV DPL,?C_XBP+1 MOV R7,#?STACK-1 MOV A,SP SUBB A,R7 ;因为SP-(?STACK-1)不可能为零所以不用判断0 MOV R7,A MOV R6,A INC DPTR;%%%%????%%%%%% ;不用防止!!! 以前的注释:防止多减一个单元 COPYSP_TO_CXBP: ;拷贝SP的内容到?C_XBP中 MOV A,DPL SUBB A,0 JNZ NOZERO DEC DPH NOZERO: DEC DPL POP ACC MOVX @DPTR,A DJNZ R7,COPYSP_TO_CXBP MOV A,DPL SUBB A,0 JNZ NOZERO2 DEC DPH NOZERO2: DEC DPL MOV A,R6 MOVX @DPTR,A ;?C_XBP栈顶保存的是 SP栈元素的总数 MOV A,DPH ;?C_XBP是满向下不用减了 MOV ?C_XBP,A MOV A,DPL MOV ?C_XBP+1,A MOV ACC,R2 ;从R1,R2中恢复SP PUSH ACC MOV ACC,R1 PUSH ACC RET *************************************************************************** 内部函数 : Enter_INT () ;(2)记忆中断的嵌套层OSIntNesting++ 进入中断 ;(3) if (OSIntNesting == 1) ; OSTCBCur->OSTCBStkPtr <= ?C_XBP *************************************************************************** *********************** ?PR?_Enter_INT?OS_CPU_A SEGMENT CODE RSEG ?PR?_Enter_INT?OS_CPU_A _Enter_INT: (2)记忆中断的嵌套层OSIntNesting++ 进入中断 MOV DPH,#HIGH(OSIntNesting) MOV DPL, #LOW(OSIntNesting) MOVX A,@DPTR INC A MOVX @DPTR,A (3) if (OSIntNesting == 1) OSTCBCur->OSTCBStkPtr <= C_XBP DEC A JNZ NOONE MOV DPH,#HIGH(OSTCBCur) MOV DPL, #LOW(OSTCBCur) INC DPTR ;指针是3字节的把我害死了 MOVX A,@DPTR MOV R1,A INC DPTR MOVX A,@DPTR MOV DPH,R1 MOV DPL,A INC DPTR ;指针是3字节的把我害死了 MOV A,?C_XBP MOVX @DPTR,A INC DPTR MOV A,?C_XBP+1 MOVX @DPTR,A NOONE: RET END *************************************************************************** 文件结束 ***************************************************************************** 0
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