os_mbox.ls1
来自「在51单片机上移植成功的UCOS-II操作系统源代码,包括源代码及相关注释」· LS1 代码 · 共 498 行 · 第 1/2 页
LS1
498 行
A51 MACRO ASSEMBLER OS_MBOX 09/09/2007 21:12:36 PAGE 1
MACRO ASSEMBLER A51 V7.10
OBJECT MODULE PLACED IN OS_MBOX.OBJ
ASSEMBLER INVOKED BY: D:\Keil\C51\BIN\A51.EXE OS_MBOX.src PR(.\OS_MBOX.ls1) EP DEBUG
LOC OBJ LINE SOURCE
1 ; .\OS_MBOX.SRC generated from: OS_MBOX.C
2 ; COMPILER INVOKED BY:
3 ; D:\Keil\C51\BIN\C51.EXE OS_MBOX.C LARGE BROWSE DEBUG OBJECTEXTEND SRC(.\OS_MBOX.SR
C)
4
5 $nomod51
6
7 NAME OS_MBOX
8
0080 9 P0 DATA 080H
0090 10 P1 DATA 090H
00A0 11 P2 DATA 0A0H
00B0 12 P3 DATA 0B0H
00B4 13 T0 BIT 0B0H.4
00D6 14 AC BIT 0D0H.6
00B5 15 T1 BIT 0B0H.5
00AF 16 EA BIT 0A8H.7
00A8 17 IE DATA 0A8H
00B7 18 RD BIT 0B0H.7
00AC 19 ES BIT 0A8H.4
00B8 20 IP DATA 0B8H
0098 21 RI BIT 098H.0
00B2 22 INT0 BIT 0B0H.2
00D7 23 CY BIT 0D0H.7
0099 24 TI BIT 098H.1
00B3 25 INT1 BIT 0B0H.3
00BC 26 PS BIT 0B8H.4
0081 27 SP DATA 081H
00D2 28 OV BIT 0D0H.2
00B6 29 WR BIT 0B0H.6
0099 30 SBUF DATA 099H
0087 31 PCON DATA 087H
0098 32 SCON DATA 098H
0089 33 TMOD DATA 089H
0088 34 TCON DATA 088H
0089 35 IE0 BIT 088H.1
008B 36 IE1 BIT 088H.3
00F0 37 B DATA 0F0H
00E0 38 ACC DATA 0E0H
00A9 39 ET0 BIT 0A8H.1
00AB 40 ET1 BIT 0A8H.3
008D 41 TF0 BIT 088H.5
008F 42 TF1 BIT 088H.7
009A 43 RB8 BIT 098H.2
008C 44 TH0 DATA 08CH
00A8 45 EX0 BIT 0A8H.0
0088 46 IT0 BIT 088H.0
008D 47 TH1 DATA 08DH
009B 48 TB8 BIT 098H.3
00AA 49 EX1 BIT 0A8H.2
008A 50 IT1 BIT 088H.2
00D0 51 P BIT 0D0H.0
009F 52 SM0 BIT 098H.7
008A 53 TL0 DATA 08AH
009E 54 SM1 BIT 098H.6
008B 55 TL1 DATA 08BH
009D 56 SM2 BIT 098H.5
00B9 57 PT0 BIT 0B8H.1
A51 MACRO ASSEMBLER OS_MBOX 09/09/2007 21:12:36 PAGE 2
00BB 58 PT1 BIT 0B8H.3
00D3 59 RS0 BIT 0D0H.3
008C 60 TR0 BIT 088H.4
00D4 61 RS1 BIT 0D0H.4
008E 62 TR1 BIT 088H.6
00B8 63 PX0 BIT 0B8H.0
00BA 64 PX1 BIT 0B8H.2
0083 65 DPH DATA 083H
0082 66 DPL DATA 082H
009C 67 REN BIT 098H.4
00B0 68 RXD BIT 0B0H.0
00B1 69 TXD BIT 0B0H.1
00D5 70 F0 BIT 0D0H.5
00D0 71 PSW DATA 0D0H
72 ; /*
73 ; *****************************************************************************************
****************
74 ; * uC/OS-II
75 ; * The Real-Time Kernel
76 ; * MESSAGE MAILBOX MANAGEMENT
77 ; *
78 ; * (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
79 ; * All Rights Reserved
80 ; *
81 ; * V2.00
82 ; *
83 ; * File : OS_MBOX.C
84 ; * By : Jean J. Labrosse
85 ; *****************************************************************************************
****************
86 ; */
87 ;
88 ; #ifndef OS_MASTER_FILE
89 ; #include "includes.h"
90 ; #endif
91 ;
92 ; #if OS_MBOX_EN
93 ; /*
94 ; *****************************************************************************************
****************
95 ; * ACCEPT MESSAGE FROM MAILBOX
96 ; *
97 ; * Description: This function checks the mailbox to see if a message is available. Unlike
OSMboxPend(),
98 ; * OSMboxAccept() does not suspend the calling task if a message is not avail
able.
99 ; *
100 ; * Arguments : pevent is a pointer to the event control block
101 ; *
102 ; * Returns : != (void *)0 is the message in the mailbox if one is available. The mail
box is cleared
103 ; * so the next time OSMboxAccept() is called, the mailbox will
be empty.
104 ; * == (void *)0 if the mailbox is empty or if you didn't pass the proper eve
nt pointer.
105 ; *****************************************************************************************
****************
106 ; */
107 ;
108 ; void *OSMboxAccept (OS_EVENT *pevent) reentrant
109 ; {
110 ; void *msg;
111 ;
112 ;
113 ; OS_ENTER_CRITICAL();
114 ; if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type
A51 MACRO ASSEMBLER OS_MBOX 09/09/2007 21:12:36 PAGE 3
*/
115 ; OS_EXIT_CRITICAL();
116 ; return ((void *)0);
117 ; }
118 ; msg = pevent->OSEventPtr;
119 ; if (msg != (void *)0) { /* See if there is already a me
ssage */
120 ; pevent->OSEventPtr = (void *)0; /* Clear the mailbox
*/
121 ; }
122 ; OS_EXIT_CRITICAL();
123 ; return (msg); /* Return the message received
(or NULL) */
124 ; }
125 ; /*$PAGE*/
126 ; /*
127 ; *****************************************************************************************
****************
128 ; * CREATE A MESSAGE MAILBOX
129 ; *
130 ; * Description: This function creates a message mailbox if free event control blocks are a
vailable.
131 ; *
132 ; * Arguments : msg is a pointer to a message that you wish to deposit in the ma
ilbox. If
133 ; * you set this value to the NULL pointer (i.e. (void *)0) then
the mailbox
134 ; * will be considered empty.
135 ; *
136 ; * Returns : != (void *)0 is a pointer to the event control clock (OS_EVENT) associate
d with the
137 ; * created mailbox
138 ; * == (void *)0 if no event control blocks were available
139 ; *****************************************************************************************
****************
140 ; */
141 ;
142 ; OS_EVENT *OSMboxCreate (void *msg) reentrant
143 ; {
144 ; OS_EVENT *pevent;
145 ;
146 ;
147 ; OS_ENTER_CRITICAL();
148 ; pevent = OSEventFreeList; /* Get next free event control block
*/
149 ; if (OSEventFreeList != (OS_EVENT *)0) { /* See if pool of free ECB pool was empt
y */
150 ; OSEventFreeList = (OS_EVENT *)OSEventFreeList->OSEventPtr;
151 ; }
152 ; OS_EXIT_CRITICAL();
153 ; if (pevent != (OS_EVENT *)0) {
154 ; pevent->OSEventType = OS_EVENT_TYPE_MBOX;
155 ; pevent->OSEventPtr = msg; /* Deposit message in event control bloc
k */
156 ; OSEventWaitListInit(pevent);
157 ; }
158 ; return (pevent); /* Return pointer to event control block
*/
159 ; }
160 ; /*$PAGE*/
161 ; /*
162 ; *****************************************************************************************
****************
163 ; * PEND ON MAILBOX FOR A MESSAGE
164 ; *
165 ; * Description: This function waits for a message to be sent to a mailbox
A51 MACRO ASSEMBLER OS_MBOX 09/09/2007 21:12:36 PAGE 4
166 ; *
167 ; * Arguments : pevent is a pointer to the event control block associated with the
desired mailbox
168 ; *
169 ; * timeout is an optional timeout period (in clock ticks). If non-zero
, your task will
170 ; * wait for a message to arrive at the mailbox up to the amount
of time
171 ; * specified by this argument. If you specify 0, however, your
task will wait
172 ; * forever at the specified mailbox or, until a message arrives
.
173 ; *
174 ; * err is a pointer to where an error message will be deposited. P
ossible error
175 ; * messages are:
176 ; *
177 ; * OS_NO_ERR The call was successful and your task rece
ived a message.
178 ; * OS_TIMEOUT A message was not received within the spec
ified timeout
179 ; * OS_ERR_EVENT_TYPE Invalid event type
180 ; * OS_ERR_PEND_ISR If you called this function from an ISR an
d the result
181 ; * would lead to a suspension.
182 ; *
183 ; * Returns : != (void *)0 is a pointer to the message received
184 ; * == (void *)0 if no message was received or you didn't pass the proper poi
nter to the
185 ; * event control block.
186 ; *****************************************************************************************
****************
187 ; */
188 ;
189 ; void *OSMboxPend (OS_EVENT *pevent, INT16U timeout, INT8U *err) reentrant
190 ; {
191 ; void *msg;
192 ;
193 ;
194 ; OS_ENTER_CRITICAL();
195 ; if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type
*/
196 ; OS_EXIT_CRITICAL();
197 ; *err = OS_ERR_EVENT_TYPE;
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