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/*----------------------------------------------------------------------------
* RL-ARM - RTX
*----------------------------------------------------------------------------
* Name: RT_MAILBOX.C
* Purpose: Implements waits and wake-ups for mailbox messages
* Rev.: V4.60
*----------------------------------------------------------------------------
*
* Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*---------------------------------------------------------------------------*/
#include "rt_TypeDef.h"
#include "RTX_Config.h"
#include "rt_System.h"
#include "rt_List.h"
#include "rt_Mailbox.h"
#include "rt_MemBox.h"
#include "rt_Task.h"
#ifdef __CORTEX_A9
#include "rt_HAL_CA.h"
#else
#include "rt_HAL_CM.h"
#endif
/*----------------------------------------------------------------------------
* Functions
*---------------------------------------------------------------------------*/
/*--------------------------- rt_mbx_init -----------------------------------*/
void rt_mbx_init (OS_ID mailbox, U16 mbx_size) {
/* Initialize a mailbox */
P_MCB p_MCB = mailbox;
p_MCB->cb_type = MCB;
p_MCB->state = 0;
p_MCB->isr_st = 0;
p_MCB->p_lnk = NULL;
p_MCB->first = 0;
p_MCB->last = 0;
p_MCB->count = 0;
p_MCB->size = (mbx_size + sizeof(void *) - sizeof(struct OS_MCB)) /
(U32)sizeof (void *);
}
/*--------------------------- rt_mbx_send -----------------------------------*/
OS_RESULT rt_mbx_send (OS_ID mailbox, void *p_msg, U16 timeout) {
/* Send message to a mailbox */
P_MCB p_MCB = mailbox;
P_TCB p_TCB;
if ((p_MCB->p_lnk != NULL) && (p_MCB->state == 1)) {
/* A task is waiting for message */
p_TCB = rt_get_first ((P_XCB)p_MCB);
#ifdef __CMSIS_RTOS
rt_ret_val2(p_TCB, 0x10/*osEventMessage*/, (U32)p_msg);
#else
*p_TCB->msg = p_msg;
rt_ret_val (p_TCB, OS_R_MBX);
#endif
rt_rmv_dly (p_TCB);
rt_dispatch (p_TCB);
}
else {
/* Store message in mailbox queue */
if (p_MCB->count == p_MCB->size) {
/* No free message entry, wait for one. If message queue is full, */
/* then no task is waiting for message. The 'p_MCB->p_lnk' list */
/* pointer can now be reused for send message waits task list. */
if (timeout == 0) {
return (OS_R_TMO);
}
if (p_MCB->p_lnk != NULL) {
rt_put_prio ((P_XCB)p_MCB, os_tsk.run);
}
else {
p_MCB->p_lnk = os_tsk.run;
os_tsk.run->p_lnk = NULL;
os_tsk.run->p_rlnk = (P_TCB)p_MCB;
/* Task is waiting to send a message */
p_MCB->state = 2;
}
os_tsk.run->msg = p_msg;
rt_block (timeout, WAIT_MBX);
return (OS_R_TMO);
}
/* Yes, there is a free entry in a mailbox. */
p_MCB->msg[p_MCB->first] = p_msg;
rt_inc (&p_MCB->count);
if (++p_MCB->first == p_MCB->size) {
p_MCB->first = 0;
}
}
return (OS_R_OK);
}
/*--------------------------- rt_mbx_wait -----------------------------------*/
OS_RESULT rt_mbx_wait (OS_ID mailbox, void **message, U16 timeout) {
/* Receive a message; possibly wait for it */
P_MCB p_MCB = mailbox;
P_TCB p_TCB;
/* If a message is available in the fifo buffer */
/* remove it from the fifo buffer and return. */
if (p_MCB->count) {
*message = p_MCB->msg[p_MCB->last];
if (++p_MCB->last == p_MCB->size) {
p_MCB->last = 0;
}
if ((p_MCB->p_lnk != NULL) && (p_MCB->state == 2)) {
/* A task is waiting to send message */
p_TCB = rt_get_first ((P_XCB)p_MCB);
#ifdef __CMSIS_RTOS
rt_ret_val(p_TCB, 0/*osOK*/);
#else
rt_ret_val(p_TCB, OS_R_OK);
#endif
p_MCB->msg[p_MCB->first] = p_TCB->msg;
if (++p_MCB->first == p_MCB->size) {
p_MCB->first = 0;
}
rt_rmv_dly (p_TCB);
rt_dispatch (p_TCB);
}
else {
rt_dec (&p_MCB->count);
}
return (OS_R_OK);
}
/* No message available: wait for one */
if (timeout == 0) {
return (OS_R_TMO);
}
if (p_MCB->p_lnk != NULL) {
rt_put_prio ((P_XCB)p_MCB, os_tsk.run);
}
else {
p_MCB->p_lnk = os_tsk.run;
os_tsk.run->p_lnk = NULL;
os_tsk.run->p_rlnk = (P_TCB)p_MCB;
/* Task is waiting to receive a message */
p_MCB->state = 1;
}
rt_block(timeout, WAIT_MBX);
#ifndef __CMSIS_RTOS
os_tsk.run->msg = message;
#endif
return (OS_R_TMO);
}
/*--------------------------- rt_mbx_check ----------------------------------*/
OS_RESULT rt_mbx_check (OS_ID mailbox) {
/* Check for free space in a mailbox. Returns the number of messages */
/* that can be stored to a mailbox. It returns 0 when mailbox is full. */
P_MCB p_MCB = mailbox;
return (p_MCB->size - p_MCB->count);
}
/*--------------------------- isr_mbx_send ----------------------------------*/
void isr_mbx_send (OS_ID mailbox, void *p_msg) {
/* Same function as "os_mbx_send", but to be called by ISRs. */
P_MCB p_MCB = mailbox;
rt_psq_enq (p_MCB, (U32)p_msg);
rt_psh_req ();
}
/*--------------------------- isr_mbx_receive -------------------------------*/
OS_RESULT isr_mbx_receive (OS_ID mailbox, void **message) {
/* Receive a message in the interrupt function. The interrupt function */
/* should not wait for a message since this would block the rtx os. */
P_MCB p_MCB = mailbox;
if (p_MCB->count) {
/* A message is available in the fifo buffer. */
*message = p_MCB->msg[p_MCB->last];
if (p_MCB->state == 2) {
/* A task is locked waiting to send message */
rt_psq_enq (p_MCB, 0);
rt_psh_req ();
}
rt_dec (&p_MCB->count);
if (++p_MCB->last == p_MCB->size) {
p_MCB->last = 0;
}
return (OS_R_MBX);
}
return (OS_R_OK);
}
/*--------------------------- rt_mbx_psh ------------------------------------*/
void rt_mbx_psh (P_MCB p_CB, void *p_msg) {
/* Store the message to the mailbox queue or pass it to task directly. */
P_TCB p_TCB;
void *mem;
if (p_CB->p_lnk != NULL) switch (p_CB->state) {
#ifdef __CMSIS_RTOS
case 3:
/* Task is waiting to allocate memory, remove it from the waiting list */
mem = rt_alloc_box(p_msg);
if (mem == NULL) break;
p_TCB = rt_get_first ((P_XCB)p_CB);
rt_ret_val(p_TCB, (U32)mem);
p_TCB->state = READY;
rt_rmv_dly (p_TCB);
rt_put_prio (&os_rdy, p_TCB);
break;
#endif
case 2:
/* Task is waiting to send a message, remove it from the waiting list */
p_TCB = rt_get_first ((P_XCB)p_CB);
#ifdef __CMSIS_RTOS
rt_ret_val(p_TCB, 0/*osOK*/);
#else
rt_ret_val(p_TCB, OS_R_OK);
#endif
p_CB->msg[p_CB->first] = p_TCB->msg;
rt_inc (&p_CB->count);
if (++p_CB->first == p_CB->size) {
p_CB->first = 0;
}
p_TCB->state = READY;
rt_rmv_dly (p_TCB);
rt_put_prio (&os_rdy, p_TCB);
break;
case 1:
/* Task is waiting for a message, pass the message to the task directly */
p_TCB = rt_get_first ((P_XCB)p_CB);
#ifdef __CMSIS_RTOS
rt_ret_val2(p_TCB, 0x10/*osEventMessage*/, (U32)p_msg);
#else
*p_TCB->msg = p_msg;
rt_ret_val (p_TCB, OS_R_MBX);
#endif
p_TCB->state = READY;
rt_rmv_dly (p_TCB);
rt_put_prio (&os_rdy, p_TCB);
break;
} else {
/* No task is waiting for a message, store it to the mailbox queue */
if (p_CB->count < p_CB->size) {
p_CB->msg[p_CB->first] = p_msg;
rt_inc (&p_CB->count);
if (++p_CB->first == p_CB->size) {
p_CB->first = 0;
}
}
else {
os_error (OS_ERR_MBX_OVF);
}
}
}
/*----------------------------------------------------------------------------
* end of file
*---------------------------------------------------------------------------*/
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