Ejemplo n.º 1
0
/**
 * @brief   Get a message from the queue.
 */
osEvent osMessageGet(osMessageQId queue_id,
                     uint32_t millisec) {

  msg_t msg;
  osEvent event;

  event.def.message_id = queue_id;

  if (port_is_isr_context()) {

    /* Waiting makes no sense in ISRs so any value except "immediate"
       makes no sense.*/
    if (millisec != 0) {
      event.status = osErrorValue;
      return event;
    }

    chSysLockFromISR();
    msg = chMBFetchI((mailbox_t *)queue_id, (msg_t*)&event.value.v);
    chSysUnlockFromISR();
  }
  else {
    msg = chMBFetch((mailbox_t *)queue_id,
                    (msg_t*)&event.value.v,
                    (systime_t)millisec);
  }

  /* Returned event type.*/
  event.status = msg == MSG_OK ? osEventMessage : osEventTimeout;
  return event;
}
Ejemplo n.º 2
0
/**
 * @brief   Restores the specified execution status and leaves a critical zone.
 * @note    A call to @p chSchRescheduleS() is automatically performed
 *          if exiting the critical zone and if not in ISR context.
 *
 * @param[in] sts       the system status to be restored.
 *
 * @xclass
 */
void chSysRestoreStatusX(syssts_t sts) {

  if (port_irq_enabled(sts)) {
    if (port_is_isr_context()) {
      chSysUnlockFromISR();
    }
    else {
      chSchRescheduleS();
      chSysUnlock();
    }
  }
}
Ejemplo n.º 3
0
/**
 * @brief   Returns the execution status and enters a critical zone.
 * @details This functions enters into a critical zone and can be called
 *          from any context. Because its flexibility it is less efficient
 *          than @p chSysLock() which is preferable when the calling context
 *          is known.
 * @post    The system is in a critical zone.
 *
 * @return              The previous system status, the encoding of this
 *                      status word is architecture-dependent and opaque.
 *
 * @xclass
 */
syssts_t chSysGetStatusAndLockX(void)  {

  syssts_t sts = port_get_irq_status();
  if (port_irq_enabled(sts)) {
    if (port_is_isr_context()) {
      chSysLockFromISR();
    }
    else {
      chSysLock();
    }
  }
  return sts;
}
Ejemplo n.º 4
0
/**
 * @brief   Put a message in the queue.
 */
osStatus osMessagePut(osMessageQId queue_id,
                      uint32_t info,
                      uint32_t millisec) {
  msg_t msg;

  if (port_is_isr_context()) {

    /* Waiting makes no sense in ISRs so any value except "immediate"
       makes no sense.*/
    if (millisec != 0)
      return osErrorValue;

    chSysLockFromISR();
    msg = chMBPostI((mailbox_t *)queue_id, (msg_t)info);
    chSysUnlockFromISR();
  }
  else
    msg = chMBPost((mailbox_t *)queue_id, (msg_t)info, (systime_t)millisec);

  return msg == MSG_OK ? osOK : osEventTimeout;
}