CC1310: Cannot open again after RF shutdown

weihan.ji

Part Number: CC1310

hi all

I find that when I'm using the CC1310 radio frequency delivery function, sometimes the radio frequency function cannot be turned on，The program will stop at the following code：

{ rfHandle = RF_open(&rfObject, RF_pProp_hsm, (RF_RadioSetup*)RF_pCmdRadioSetup_hsm, &rfParams);}

and even when radio works properly，if i use the following code to close radio,then i cannot open it anymore .

{ rfHandle = RF_open(&rfObject, RF_pProp_hsm, (RF_RadioSetup*)RF_pCmdRadioSetup_hsm, &rfParams);
RF_close(rfHandle);}

over 6 years ago

0 weihan.ji over 6 years ago

Intellectual 580 points

What is the meaning of the “RF_pCmdFs_preDef->fractFreq = 0x0000”parameter?

0 TER over 6 years ago in reply to weihan.ji

TI__Guru**** 317180 points

fractFreq is described in table 23-24 in .

The easiest is to use SmartRF Studio to calculate it.

0 Richard W. over 6 years ago

TI__Genius 14860 points

Hi,

your question and code example are ambiguous. Can you please confirm that you are doing the following:

rfHandle = RF_open(...); /* Open the driver the first time */
// ...
RF_close(rfHandle); /* Close the RF driver instance */
// ...
rfHandle = RF_open(...); /* Open the driver the second time */

For every RF_open(), you must have a matching RF_close() before you can re-open it again.

0 weihan.ji over 6 years ago in reply to Richard W.

Intellectual 580 points

Hi Richard,

Thank you for your answer，I mean,I did the following code：

rfHandle = RF_open(...); /* Open the driver the first time */
// ...
RF_close(rfHandle); /* Close the RF driver instance */
// ...
rfHandle = RF_open(...); /* Open the driver the second time */
Initially, because my program was running for some time, the RF module could not be open，

So I tried using the code above to debug it， and then, if I'm using RF_close after RF_open,i cannot open it again by using RF_open

0 Richard W. over 6 years ago in reply to weihan.ji

TI__Genius 14860 points

Hi,

I have never seen this behavior. Are you maybe step-debugging with interrupts disabled? If not, can you please create a minimal and self-containing example which shows this error including the information about which SDK version you are using?

Thanks

0 weihan.ji over 6 years ago in reply to Richard W.

Intellectual 580 points

Hi Richard,

I used the example of Resource Explorer, Follow the path shown below

I use the rfPacketRx and rfPacketTx to send and receive data，if i added the 121 and 122 lines in rfPacketTx.c as follows：

RF_close(rfHandle); //
rfHandle = RF_open(&rfObject, &RF_prop, (RF_RadioSetup*)&RF_cmdPropRadioDivSetup, &rfParams);

Then can't work properly.

Thanks again for your answer.

0 weihan.ji over 6 years ago in reply to weihan.ji

Intellectual 580 points

0 Richard W. over 6 years ago in reply to weihan.ji

TI__Genius 14860 points

Hi,

thank you. Now I can understand the problem. You are basically doing this:

    curtime = RF_getCurrentTime();
    while(1)
    {
        // ...
        RF_close();
    
        // ... 
        RF_open();
        
        curtime += PACKET_INTERVAL;
        RF_cmdPropTx.startTime = curtime;

        RF_runCmd(rfHandle, (RF_Op*)&RF_cmdPropTx, RF_PriorityNormal, NULL, 0);
    }

This cannot work. The rfPacketTx example uses absolute start triggers (TRIG_ABSTIME). The base time stamp is obtained with RF_getCurrentTime() before the while loop and then constantly increased. When you close and re-open the driver in between, these timestamps are not valid anymore. In your case, the RF driver seems to interpret the timestamp as a time very far in the future and wait for a very long time.

Why do you want to close the RF driver instance? If you want to force the RF core to go into standby, you can use RF_yield(). Please read more about the driver power management in this document. You may also use TRIG_NOW as a start trigger instead. The rfPacketTx example is not really a good example to show spontaneous transmission.

0 weihan.ji over 6 years ago in reply to Richard W.

Intellectual 580 points

Hi Richard，

Thank you very much for your professional answer，it has helped me a lot.

I see what you mean，but I think I should have done the following：


        RF_open();
        //
        RF_close();
    
        // ... 
        RF_open();

    while(1)
    {
       
        curtime = RF_getCurrentTime();
        curtime += PACKET_INTERVAL;
        RF_cmdPropTx.startTime = curtime;

        RF_runCmd(rfHandle, (RF_Op*)&RF_cmdPropTx, RF_PriorityNormal, NULL, 0);
    }

Is there any mistake in this code that I don't know? Thanks again.

0 Richard W. over 6 years ago in reply to weihan.ji

TI__Genius 14860 points

Hi,

this looks ok to me as long as you do not re-use time stamps after RF_close().

RF_open();
// Here you can now use time stamps obtained by RF_getCurrentTime()
// and calculate new time stamps for future command execution.
RF_close();

RF_open();
// You cannot use the time stamps from above anymore. 
// You need to call RF_getCurrentTime() again.

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CC1310: Cannot open again after RF shutdown