📄 os_mbox.lst
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\ ??OSMboxDel_11:
\ 000000AC .... ADR.N R0,??DataTable3 ;; "\?"
\ 000000AE C9F81400 STR R0,[R9, #+20]
227 #endif
228 pevent->OSEventType = OS_EVENT_TYPE_UNUSED;
\ 000000B2 0020 MOVS R0,#+0
\ 000000B4 89F80000 STRB R0,[R9, #+0]
229 pevent->OSEventPtr = OSEventFreeList; /* Return Event Control Block to free list */
\ 000000B8 .... LDR.N R0,??DataTable3_2
\ 000000BA 0068 LDR R0,[R0, #+0]
\ 000000BC C9F80400 STR R0,[R9, #+4]
230 pevent->OSEventCnt = 0u;
\ 000000C0 0020 MOVS R0,#+0
\ 000000C2 A9F80800 STRH R0,[R9, #+8]
231 OSEventFreeList = pevent; /* Get next free event control block */
\ 000000C6 .... LDR.N R0,??DataTable3_2
\ 000000C8 C0F80090 STR R9,[R0, #+0]
232 OS_EXIT_CRITICAL();
\ 000000CC 4046 MOV R0,R8
\ 000000CE ........ BL OS_CPU_SR_Restore
233 if (tasks_waiting == OS_TRUE) { /* Reschedule only if task(s) were waiting */
\ 000000D2 F6B2 UXTB R6,R6 ;; ZeroExt R6,R6,#+24,#+24
\ 000000D4 012E CMP R6,#+1
\ 000000D6 01D1 BNE.N ??OSMboxDel_12
234 OS_Sched(); /* Find highest priority task ready to run */
\ 000000D8 ........ BL OS_Sched
235 }
236 *perr = OS_ERR_NONE;
\ ??OSMboxDel_12:
\ 000000DC 0020 MOVS R0,#+0
\ 000000DE 2870 STRB R0,[R5, #+0]
237 pevent_return = (OS_EVENT *)0; /* Mailbox has been deleted */
\ 000000E0 0020 MOVS R0,#+0
\ 000000E2 0700 MOVS R7,R0
238 break;
\ 000000E4 05E0 B.N ??OSMboxDel_10
239
240 default:
241 OS_EXIT_CRITICAL();
\ ??OSMboxDel_7:
\ 000000E6 4046 MOV R0,R8
\ 000000E8 ........ BL OS_CPU_SR_Restore
242 *perr = OS_ERR_INVALID_OPT;
\ 000000EC 0720 MOVS R0,#+7
\ 000000EE 2870 STRB R0,[R5, #+0]
243 pevent_return = pevent;
\ 000000F0 4F46 MOV R7,R9
244 break;
245 }
246 return (pevent_return);
\ ??OSMboxDel_10:
\ 000000F2 3800 MOVS R0,R7
\ ??OSMboxDel_1:
\ 000000F4 BDE8F283 POP {R1,R4-R9,PC} ;; return
247 }
248 #endif
249
250 /*$PAGE*/
251 /*
252 *********************************************************************************************************
253 * PEND ON MAILBOX FOR A MESSAGE
254 *
255 * Description: This function waits for a message to be sent to a mailbox
256 *
257 * Arguments : pevent is a pointer to the event control block associated with the desired mailbox
258 *
259 * timeout is an optional timeout period (in clock ticks). If non-zero, your task will
260 * wait for a message to arrive at the mailbox up to the amount of time
261 * specified by this argument. If you specify 0, however, your task will wait
262 * forever at the specified mailbox or, until a message arrives.
263 *
264 * perr is a pointer to where an error message will be deposited. Possible error
265 * messages are:
266 *
267 * OS_ERR_NONE The call was successful and your task received a
268 * message.
269 * OS_ERR_TIMEOUT A message was not received within the specified 'timeout'.
270 * OS_ERR_PEND_ABORT The wait on the mailbox was aborted.
271 * OS_ERR_EVENT_TYPE Invalid event type
272 * OS_ERR_PEND_ISR If you called this function from an ISR and the result
273 * would lead to a suspension.
274 * OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer
275 * OS_ERR_PEND_LOCKED If you called this function when the scheduler is locked
276 *
277 * Returns : != (void *)0 is a pointer to the message received
278 * == (void *)0 if no message was received or,
279 * if 'pevent' is a NULL pointer or,
280 * if you didn't pass the proper pointer to the event control block.
281 *********************************************************************************************************
282 */
283 /*$PAGE*/
\ In section .text, align 2, keep-with-next
284 void *OSMboxPend (OS_EVENT *pevent,
285 INT32U timeout,
286 INT8U *perr)
287 {
\ OSMboxPend:
\ 00000000 2DE9F041 PUSH {R4-R8,LR}
\ 00000004 0400 MOVS R4,R0
\ 00000006 0D00 MOVS R5,R1
\ 00000008 1600 MOVS R6,R2
288 void *pmsg;
289 #if OS_CRITICAL_METHOD == 3u /* Allocate storage for CPU status register */
290 OS_CPU_SR cpu_sr = 0u;
\ 0000000A 5FF00008 MOVS R8,#+0
291 #endif
292
293
294
295 #ifdef OS_SAFETY_CRITICAL
296 if (perr == (INT8U *)0) {
297 OS_SAFETY_CRITICAL_EXCEPTION();
298 return ((void *)0);
299 }
300 #endif
301
302 #if OS_ARG_CHK_EN > 0u
303 if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
304 *perr = OS_ERR_PEVENT_NULL;
305 return ((void *)0);
306 }
307 #endif
308 if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
\ 0000000E 2078 LDRB R0,[R4, #+0]
\ 00000010 0128 CMP R0,#+1
\ 00000012 03D0 BEQ.N ??OSMboxPend_0
309 *perr = OS_ERR_EVENT_TYPE;
\ 00000014 0120 MOVS R0,#+1
\ 00000016 3070 STRB R0,[R6, #+0]
310 return ((void *)0);
\ 00000018 0020 MOVS R0,#+0
\ 0000001A 74E0 B.N ??OSMboxPend_1
311 }
312 if (OSIntNesting > 0u) { /* See if called from ISR ... */
\ ??OSMboxPend_0:
\ 0000001C .... LDR.N R0,??DataTable3_1
\ 0000001E 0078 LDRB R0,[R0, #+0]
\ 00000020 0028 CMP R0,#+0
\ 00000022 03D0 BEQ.N ??OSMboxPend_2
313 *perr = OS_ERR_PEND_ISR; /* ... can't PEND from an ISR */
\ 00000024 0220 MOVS R0,#+2
\ 00000026 3070 STRB R0,[R6, #+0]
314 return ((void *)0);
\ 00000028 0020 MOVS R0,#+0
\ 0000002A 6CE0 B.N ??OSMboxPend_1
315 }
316 if (OSLockNesting > 0u) { /* See if called with scheduler locked ... */
\ ??OSMboxPend_2:
\ 0000002C .... LDR.N R0,??DataTable3_3
\ 0000002E 0078 LDRB R0,[R0, #+0]
\ 00000030 0028 CMP R0,#+0
\ 00000032 03D0 BEQ.N ??OSMboxPend_3
317 *perr = OS_ERR_PEND_LOCKED; /* ... can't PEND when locked */
\ 00000034 0D20 MOVS R0,#+13
\ 00000036 3070 STRB R0,[R6, #+0]
318 return ((void *)0);
\ 00000038 0020 MOVS R0,#+0
\ 0000003A 64E0 B.N ??OSMboxPend_1
319 }
320 OS_ENTER_CRITICAL();
\ ??OSMboxPend_3:
\ 0000003C ........ BL OS_CPU_SR_Save
\ 00000040 8046 MOV R8,R0
321 pmsg = pevent->OSEventPtr;
\ 00000042 6068 LDR R0,[R4, #+4]
\ 00000044 0700 MOVS R7,R0
322 if (pmsg != (void *)0) { /* See if there is already a message */
\ 00000046 002F CMP R7,#+0
\ 00000048 08D0 BEQ.N ??OSMboxPend_4
323 pevent->OSEventPtr = (void *)0; /* Clear the mailbox */
\ 0000004A 0020 MOVS R0,#+0
\ 0000004C 6060 STR R0,[R4, #+4]
324 OS_EXIT_CRITICAL();
\ 0000004E 4046 MOV R0,R8
\ 00000050 ........ BL OS_CPU_SR_Restore
325 *perr = OS_ERR_NONE;
\ 00000054 0020 MOVS R0,#+0
\ 00000056 3070 STRB R0,[R6, #+0]
326 return (pmsg); /* Return the message received (or NULL) */
\ 00000058 3800 MOVS R0,R7
\ 0000005A 54E0 B.N ??OSMboxPend_1
327 }
328 OSTCBCur->OSTCBStat |= OS_STAT_MBOX; /* Message not available, task will pend */
\ ??OSMboxPend_4:
\ 0000005C .... LDR.N R0,??DataTable3_4
\ 0000005E 0068 LDR R0,[R0, #+0]
\ 00000060 90F83400 LDRB R0,[R0, #+52]
\ 00000064 50F00200 ORRS R0,R0,#0x2
\ 00000068 .... LDR.N R1,??DataTable3_4
\ 0000006A 0968 LDR R1,[R1, #+0]
\ 0000006C 81F83400 STRB R0,[R1, #+52]
329 OSTCBCur->OSTCBStatPend = OS_STAT_PEND_OK;
\ 00000070 .... LDR.N R0,??DataTable3_4
\ 00000072 0068 LDR R0,[R0, #+0]
\ 00000074 0021 MOVS R1,#+0
\ 00000076 80F83510 STRB R1,[R0, #+53]
330 OSTCBCur->OSTCBDly = timeout; /* Load timeout in TCB */
\ 0000007A .... LDR.N R0,??DataTable3_4
\ 0000007C 0068 LDR R0,[R0, #+0]
\ 0000007E 0563 STR R5,[R0, #+48]
331 OS_EventTaskWait(pevent); /* Suspend task until event or timeout occurs */
\ 00000080 2000 MOVS R0,R4
\ 00000082 ........ BL OS_EventTaskWait
332 OS_EXIT_CRITICAL();
\ 00000086 4046 MOV R0,R8
\ 00000088 ........ BL OS_CPU_SR_Restore
333 OS_Sched(); /* Find next highest priority task ready to run */
\ 0000008C ........ BL OS_Sched
334 OS_ENTER_CRITICAL();
\ 00000090 ........ BL OS_CPU_SR_Save
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