📄 os_mutex.src
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; .\OS_MUTEX.SRC generated from: SOURCE\OS_MUTEX.C
; COMPILER INVOKED BY:
; D:\tools\Keil\C51\BIN\C51.EXE SOURCE\OS_MUTEX.C LARGE OPTIMIZE(SIZE) REGFILE(.\OS_AT89C55WD.ORC) BROWSE NOINTPROMOTE INCDIR(D:\MY\empolder\uCOS-II\MCS-51\AT89C55WD\Keil 7_5\) DEBUG OBJECTEXTEND NOPRINT SRC(.\OS_MUTEX.SRC)
$NOMOD51
NAME OS_MUTEX
P0 DATA 080H
P1 DATA 090H
P2 DATA 0A0H
P3 DATA 0B0H
AC BIT 0D0H.6
T0 BIT 0B0H.4
T2_EX BIT 090H.1
T1 BIT 0B0H.5
EA BIT 0A8H.7
T2 BIT 090H.0
IE DATA 0A8H
P0_0 BIT 080H.0
P1_0 BIT 090H.0
P0_1 BIT 080H.1
P2_0 BIT 0A0H.0
P1_1 BIT 090H.1
P0_2 BIT 080H.2
P2_1 BIT 0A0H.1
P1_2 BIT 090H.2
P0_3 BIT 080H.3
P2_2 BIT 0A0H.2
P1_3 BIT 090H.3
P0_4 BIT 080H.4
P2_3 BIT 0A0H.3
P1_4 BIT 090H.4
P0_5 BIT 080H.5
EXF2 BIT 0C8H.6
RD BIT 0B0H.7
P2_4 BIT 0A0H.4
P1_5 BIT 090H.5
P0_6 BIT 080H.6
P2_5 BIT 0A0H.5
P1_6 BIT 090H.6
P0_7 BIT 080H.7
ES BIT 0A8H.4
P2_6 BIT 0A0H.6
P1_7 BIT 090H.7
P2_7 BIT 0A0H.7
IP DATA 0B8H
RI BIT 098H.0
CY BIT 0D0H.7
INT0 BIT 0B0H.2
TI BIT 098H.1
INT1 BIT 0B0H.3
RCAP2H DATA 0CBH
PS BIT 0B8H.4
SP DATA 081H
OV BIT 0D0H.2
RCAP2L DATA 0CAH
C_T2 BIT 0C8H.1
WR BIT 0B0H.6
RCLK BIT 0C8H.5
TCLK BIT 0C8H.4
PCON DATA 087H
SBUF DATA 099H
SCON DATA 098H
TMOD DATA 089H
TCON DATA 088H
IE0 BIT 088H.1
IE1 BIT 088H.3
B DATA 0F0H
CP_RL2 BIT 0C8H.0
ACC DATA 0E0H
ET0 BIT 0A8H.1
TF0 BIT 088H.5
ET1 BIT 0A8H.3
TF1 BIT 088H.7
ET2 BIT 0A8H.5
TF2 BIT 0C8H.7
RB8 BIT 098H.2
TH0 DATA 08CH
IT0 BIT 088H.0
EX0 BIT 0A8H.0
TH1 DATA 08DH
IT1 BIT 088H.2
EX1 BIT 0A8H.2
TB8 BIT 098H.3
TH2 DATA 0CDH
P BIT 0D0H.0
SM0 BIT 098H.7
TL0 DATA 08AH
SM1 BIT 098H.6
TL1 DATA 08BH
SM2 BIT 098H.5
TL2 DATA 0CCH
PT0 BIT 0B8H.1
PT1 BIT 0B8H.3
RS0 BIT 0D0H.3
TR0 BIT 088H.4
PT2 BIT 0B8H.5
RS1 BIT 0D0H.4
TR1 BIT 088H.6
TR2 BIT 0C8H.2
PX0 BIT 0B8H.0
PX1 BIT 0B8H.2
DPH DATA 083H
DPL DATA 082H
EXEN2 BIT 0C8H.3
REN BIT 098H.4
T2MOD DATA 0C9H
T2CON DATA 0C8H
DPS DATA 0A2H
RXD BIT 0B0H.0
TXD BIT 0B0H.1
F0 BIT 0D0H.5
F1 BIT 0D0H.1
PSW DATA 0D0H
; /*
; *********************************************************************************************************
; * uC/OS-II
; * The Real-Time Kernel
; * MUTUAL EXCLUSION SEMAPHORE MANAGEMENT
; *
; * (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL
; * All Rights Reserved
; *
; * File : OS_MUTEX.C
; * By : Jean J. Labrosse
; *********************************************************************************************************
; */
;
; #ifndef OS_MASTER_FILE
; #include "includes.h"
; #endif
;
; /*
; *********************************************************************************************************
; * LOCAL CONSTANTS
; *********************************************************************************************************
; */
;
; #define OS_MUTEX_KEEP_LOWER_8 0x00FF
; #define OS_MUTEX_KEEP_UPPER_8 0xFF00
;
; #define OS_MUTEX_AVAILABLE 0x00FF
;
;
; #if OS_MUTEX_EN > 0
; /*
; *********************************************************************************************************
; * ACCEPT MUTUAL EXCLUSION SEMAPHORE
; *
; * Description: This function checks the mutual exclusion semaphore to see if a resource is available.
; * Unlike OSMutexPend(), OSMutexAccept() does not suspend the calling task if the resource is
; * not available or the event did not occur.
; *
; * Arguments : pevent is a pointer to the event control block
; *
; * err is a pointer to an error code which will be returned to your application:
; * OS_NO_ERR if the call was successful.
; * OS_ERR_EVENT_TYPE if 'pevent' is not a pointer to a mutex
; * OS_ERR_PEVENT_NULL 'pevent' is a NULL pointer
; * OS_ERR_PEND_ISR if you called this function from an ISR
; *
; * Returns : == 1 if the resource is available, the mutual exclusion semaphore is acquired
; * == 0 a) if the resource is not available
; * b) you didn't pass a pointer to a mutual exclusion semaphore
; * c) you called this function from an ISR
; *
; * Warning(s) : This function CANNOT be called from an ISR because mutual exclusion semaphores are
; * intended to be used by tasks only.
; *********************************************************************************************************
; */
;
; #if OS_MUTEX_ACCEPT_EN > 0
; INT8U OSMutexAccept (OS_EVENT *pevent, INT8U *err)LG_REENTRANT
; {
; #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
; OS_CPU_SR cpu_sr;
; #endif
;
;
; if (OSIntNesting > 0) { /* Make sure it's not called from an ISR */
; *err = OS_ERR_PEND_ISR;
; return (0);
; }
; #if OS_ARG_CHK_EN > 0
; if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
; *err = OS_ERR_PEVENT_NULL;
; return (0);
; }
; if (pevent->OSEventType != OS_EVENT_TYPE_MUTEX) { /* Validate event block type */
; *err = OS_ERR_EVENT_TYPE;
; return (0);
; }
; #endif
; OS_ENTER_CRITICAL(); /* Get value (0 or 1) of Mutex */
; if ((pevent->OSEventCnt & OS_MUTEX_KEEP_LOWER_8) == OS_MUTEX_AVAILABLE) {
; pevent->OSEventCnt &= OS_MUTEX_KEEP_UPPER_8; /* Mask off LSByte (Acquire Mutex) */
; pevent->OSEventCnt |= OSTCBCur->OSTCBPrio; /* Save current task priority in LSByte */
; pevent->OSEventPtr = (void *)OSTCBCur; /* Link TCB of task owning Mutex */
; OS_EXIT_CRITICAL();
; *err = OS_NO_ERR;
; return (1);
; }
; OS_EXIT_CRITICAL();
; *err = OS_NO_ERR;
; return (0);
; }
; #endif
;
; /*$PAGE*/
; /*
; *********************************************************************************************************
; * CREATE A MUTUAL EXCLUSION SEMAPHORE
; *
; * Description: This function creates a mutual exclusion semaphore.
; *
; * Arguments : prio is the priority to use when accessing the mutual exclusion semaphore. In
; * other words, when the semaphore is acquired and a higher priority task
; * attempts to obtain the semaphore then the priority of the task owning the
; * semaphore is raised to this priority. It is assumed that you will specify
; * a priority that is LOWER in value than ANY of the tasks competing for the
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