mirror of
https://github.com/ARMmbed/DAPLink.git
synced 2025-07-16 15:07:29 +08:00
249 lines
7.1 KiB
C
249 lines
7.1 KiB
C
/**
|
|
* @file rt_Mailbox.c
|
|
* @brief
|
|
*
|
|
* DAPLink Interface Firmware
|
|
* Copyright (c) 2009-2016, ARM Limited, All Rights Reserved
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
* not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include "rt_TypeDef.h"
|
|
#include "RTX_Config.h"
|
|
#include "rt_System.h"
|
|
#include "rt_List.h"
|
|
#include "rt_Mailbox.h"
|
|
#include "rt_Task.h"
|
|
#include "rt_HAL_CM.h"
|
|
|
|
|
|
/*----------------------------------------------------------------------------
|
|
* 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->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->count == 0) {
|
|
/* A task is waiting for message */
|
|
p_TCB = rt_get_first ((P_XCB)p_MCB);
|
|
*p_TCB->msg = p_msg;
|
|
p_TCB->ret_val = OS_R_MBX;
|
|
rt_rmv_dly (p_TCB);
|
|
rt_dispatch (p_TCB);
|
|
os_tsk.run->ret_val = OS_R_OK;
|
|
}
|
|
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;
|
|
/* Signal the 'isr_mbx_receive ()' that the task is waiting */
|
|
/* to send a message */
|
|
p_MCB->isr_st = 1;
|
|
}
|
|
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) {
|
|
/* A task is waiting to send message */
|
|
p_TCB = rt_get_first ((P_XCB)p_MCB);
|
|
p_TCB->ret_val = OS_R_OK;
|
|
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);
|
|
os_tsk.run->ret_val = OS_R_OK;
|
|
}
|
|
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;
|
|
}
|
|
rt_block(timeout, WAIT_MBX);
|
|
os_tsk.run->msg = message;
|
|
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->isr_st == 1) {
|
|
/* A task is locked waiting to send message */
|
|
p_MCB->isr_st = 2;
|
|
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;
|
|
|
|
/* Check if this was an 'isr_mbx_receive ()' post service request. */
|
|
if (p_CB->p_lnk != NULL && p_CB->isr_st == 2) {
|
|
/* A task is waiting to send message, remove it from the waiting list. */
|
|
p_CB->isr_st = 0;
|
|
p_TCB = rt_get_first ((P_XCB)p_CB);
|
|
p_TCB->ret_val = OS_R_OK;
|
|
/* Store the message to the mailbox queue. */
|
|
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;
|
|
}
|
|
goto rdy;
|
|
}
|
|
/* A task is waiting for message, pass the message to task directly. */
|
|
if (p_CB->p_lnk != NULL && p_CB->count == 0) {
|
|
p_TCB = rt_get_first ((P_XCB)p_CB);
|
|
*p_TCB->msg = p_msg;
|
|
p_TCB->ret_val = OS_R_MBX;
|
|
rdy:p_TCB->state = READY;
|
|
rt_rmv_dly (p_TCB);
|
|
rt_put_prio (&os_rdy, p_TCB);
|
|
}
|
|
else {
|
|
/* No task is waiting for message, store the message 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
|
|
*---------------------------------------------------------------------------*/
|
|
|