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RTOS osMessagePut usage problem

lampo over 10 years ago

It takes me several days for debbuging ,but didn't work.

when the para 'timeout' of osMessagePut(id,info,timeout) is not set to 0,
then the program crashes with info 'OS_ERROR_MBX_OVF' , which means mailbox overflow.
But with timeout setting to 0,everything seems ok.

It really confuses me. Can anyone help me ? Thanks a lot!

The main frame of my program is as follows
(it is from mdk example 'CAN_Ex', basically not changed much )

osPoolDef(rlcan_mpool, 80, CAN_msg);
osMessageQDef(rlcan_msgq_tx, 20, CAN_msg);

/* Thread1, used to send can message */
while(1)
{
        ...
        /* check if  hardware is free for send */
        if (CAN_hw_tx_empty (ctrl) == CAN_OK)
        {
                CAN_hw_wr (ctrl, msg);     /* Send message */
        }
        else
        {
                ptrmsg = osPoolAlloc(rlcan_mpool);

                  /* for timeout is not 0, it crashes after ISR getting about 16 messages */
                result = osMessagePut(rlcan_msgq_tx, ptrmsg, 10);
                if (result != osOK) osPoolFree(rlcan_mpool, ptrmsg);
        }
        osDelay (500);
}


/* ISR, interrupt generates after msg sending succeeds */

void CAN0_ORed_Message_buffer_IRQHandler (void)
{
        ...
        iflag1 = CANc->IFLAG1; //iflag1 will be set if  msg sending succeeds

        while(iflag1)
        {
                iflag1 = 0;

                 /* it crashes after getting about 16 messages */
                 evt = osMessageGet(rlcan_msgq_tx[CTRL0], 0);
                if (evt.status == osEventMessage)
                {
                        CAN_hw_wr (CTRL,evt.value.p);  /* Send message */
                        osPoolFree(rlcan_mpool, evt.value.p);
                }
                iflag1 = CANc->IFLAG1; //check whether iflag1 is set again
        }
}

Parents

0 lampo over 10 years ago in reply to ChenTang

thanks,Chen. I had read the details regarding osMessagePut(). The parameter millisec is indeed 0 for using osMessageGet() in ISR.

And I can see the result of osMessagePut with 'printf', it shows that before entering ISR(where osMessageGet is called), osMessagePut has already returned,as showing below.

I'm really confused now.

/* Thread1, used to send can message */
while(1)
{
        ...
        /* check if  hardware is free for send */
        if (CAN_hw_tx_empty (ctrl) == CAN_OK)
        {
                CAN_hw_wr (ctrl, msg);     /* Send message */
        }
        else
        {
                ptrmsg = osPoolAlloc(rlcan_mpool);

                result = osMessagePut(rlcan_msgq_tx, ptrmsg, 10);
                if (result != osOK)
                {
                   osPoolFree(rlcan_mpool, ptrmsg);
                   printf("after osPoolFree");
                }
        }
        osDelay (500);
}

Reply

0 lampo over 10 years ago in reply to ChenTang

thanks,Chen. I had read the details regarding osMessagePut(). The parameter millisec is indeed 0 for using osMessageGet() in ISR.

And I can see the result of osMessagePut with 'printf', it shows that before entering ISR(where osMessageGet is called), osMessagePut has already returned,as showing below.

I'm really confused now.

/* Thread1, used to send can message */
while(1)
{
        ...
        /* check if  hardware is free for send */
        if (CAN_hw_tx_empty (ctrl) == CAN_OK)
        {
                CAN_hw_wr (ctrl, msg);     /* Send message */
        }
        else
        {
                ptrmsg = osPoolAlloc(rlcan_mpool);

                result = osMessagePut(rlcan_msgq_tx, ptrmsg, 10);
                if (result != osOK)
                {
                   osPoolFree(rlcan_mpool, ptrmsg);
                   printf("after osPoolFree");
                }
        }
        osDelay (500);
}

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