CC2530 Mini ZNP Kit - Bidirectional communication between Coordinator and end device

Hi,

The coordinator's short address is always 0x0000. Use destinationShortAddress=0 when calling afSendData() (AF/ZDO interface) or sendData() (Simple API interface).

Regards,

Kristof

hello Kristof, Thank you for your reply

I have communication from End device to Coordinator working smoothly !

My final aim is a Bidirectional Communication between Coordinator & End Device

Breaking down my task I tried to make the coordinator transmit and end device receive; & thinking later to make it bidirectional ? m i in the right way?

-------------------------------------------------------------------------------------------------------------

To make Coordinator transmit 1 byte data to End device

--------------------------------------------------------------------------------------------------------------------------------------

Coordinator Code

 while(1)
    {
        unsigned char testMessage[] = {0x0B};   
        afSendData(DEFAULT_ENDPOINT,0x0000, 0, TEST_CLUSTER, testMessage, 1);
    } 

End Device Code

while (1)
    {
        setLed(1);
        
         /* Now the network is running - continually poll for any received messages from the ZNP */
#ifdef FIND_MAC_ADDRESS_OF_SENDER  //define this to print out sender's MAC address
   displayReceivedMessagesAndFindDevice();
#else
   displayReceivedMessages();
#endif  

        handleReturnValue();
        clearLeds();        
        HAL_SLEEP();
    }

************************

HyperTerminal

------------------------------

Basic Communications Example - END DEVICE - using AFZDO
Accelerometer Registers: whoAmI = 53, revId = 10
Calibrating VLO...
VLO = 12422 Hz;  Done.
Success
Setting StartupOptions
Success
Reset the ZNP
Success
Setting Zigbee Device Type
Success
Registering Application
Success
Starting the Application
Success
Rx: 01 45 C0 06

On Network! HhU¹‘¥¹Message 0 #################################################
################################################################################
###########################################################

Uh, Sorry..

When you get a message from the End Device you can extract the short address in the following way: 

unsigned int ansAddr = CONVERT_TO_INT(znpBuf[SRSP_HEADER_SIZE+4],znpBuf[SRSP_HEADER_SIZE+5]);

Regards,

Kristof

Edit: The offsets in the znpBuf can be different, I use this code with UART communication, not SPI.

When I debug the code, at End Device = > SRDY_IS_HIGH is not going low(meaning no message is coming right?) so the code is locked up at the line while (SRDY_IS_HIGH()); & never go to pollAndDisplay(); to execute CONVERT_TO_INT(znpBuf[2], znpBuf[1]) == ZDO_STATE_CHANGE_IND
but in the console I see a '#' keep coming...??

----------------------------------------------------------------------------------------------------------------------------------------

void waitForDeviceState(unsigned char expectedState)
{
    unsigned char state = 0xFF;
    while (state != expectedState)
    {
        while (SRDY_IS_HIGH());         
        pollAndDisplay();
        if (CONVERT_TO_INT(znpBuf[2], znpBuf[1]) == ZDO_STATE_CHANGE_IND)
            state = znpBuf[SRSP_PAYLOAD_START];
    }
}

/** Waits for SRDY to go low, indicating a message has arrived. Displays the msg to console. */
void displayReceivedMessages()
{
    while (1)
    {       
        while (SRDY_IS_HIGH());         
        pollAndDisplay();
    }
}

When I debug the code, at End Device

In displayReceivedMessages() the code is locked up at while (SRDY_IS_HIGH());   i.e. SRDY never goes low, indicating a message has arrived
& never go to pollAndDisplay();

but in the console I see a '#' keep coming...??

----------------------------------------------------------------------------------------------------------------------------------------

void pollAndDisplay()
{
        spiPoll();
        if (znpBuf[SRSP_LENGTH_FIELD] > 0)
        {
            printf("Rx: ");
            printHexBytes(znpBuf, (znpBuf[SRSP_LENGTH_FIELD] + SRSP_HEADER_SIZE));
            znpBuf[SRSP_LENGTH_FIELD] = 0;
        }
}

/** Waits for SRDY to go low, indicating a message has arrived. Displays the msg to console. */
void displayReceivedMessages()
{
    while (1)
    {       
        while (SRDY_IS_HIGH());         
        pollAndDisplay();
    }
}

Hi,

Try to use 0xFFFF as short address when sending messages from the Coordinator. 0xFFFF is the broadcast short address defined as ALL_DEVICES in znp_interface.h.

Regards,

Kristof

Thanks a lot Kristof

Where do u get these information like 0xFFFF is broadcast short address ??
Can you please share that guide to me? I am going through the code to understand things

Thanks, Sharika

Ok, I forgot to mention the CC2530ZNP_interface_specification.pdf (TI literature number SWRA312) ...

Regards,

Kristof

Hi, 

Also read the "Z-Stack Developer's Guide.pdf" (SWRA176)

Regards,

Kristof

Thanks kristof,

Bidirectional communication works smoothly now using broadcast :

 afSendData(DEFAULT_ENDPOINT,DEFAULT_ENDPOINT,0XFFFF, TEST_CLUSTER, testMessage, 6);

Howevr I am unable to do a unicast in "basic_comms_coordinator_afzdo"

Please let me know if you have any idea about unicast

~Sharika

I encounter the similar problem using sample code in "example_basic_comms_xxx_afzdo.c".

I tried the solutions about broadcast from Coordinator, it works from coordinator to end device.

However, if the coordinator receives information from end device to process first and then sends back. The end device never receives any signal from coordinator ( the SRDY_IS_HIGH() never go low )

I have tried for both broadcast and specify destination short address, and they didn't work.

Any idea about where the problem is ? Thanks.

the simplified code is listed following:

[Coordinator]------------------------------------------------

 while (1)

{

  while (SRDY_IS_HIGH());  //Receive something here, it works well...

  pollAndDisplay();

  // do something ..

  afSendData(DEFAULT_ENDPOINT, DEFAULT_ENDPOINT, 0XFFFF, TEST_CLUSTER, data, 2);

  handleReturnValue();

}

[End device]------------------------------------------------

 while (1)

{

  afSendData(DEFAULT_ENDPOINT,DEFAULT_ENDPOINT,0, TEST_CLUSTER, data, 2);

  handleReturnValue();

  delayMs(500); //wait for coordinator

   while ( SRDY_IS_HIGH() );  //the SRDY_IS_HIGH() never go low here ...
   pollAndDisplay();

   //Do something ...

}

I put a "delayMs(1000)" before calling afSendData() in Coordinator, and the bidirectional communication works !

Hey guys, I know it's been a while but I was wondering, where in the original sample code did you make the modifications? I have tried many different aproaches a to where to modify it but I keep getting "error -31" at the wait for message method.

Thank you just for reading this!

Hi, I use "example_basic_comms_coordinator_afzdo" and "example_basic_comms_end_device_afzdo" for code modifications. All the modifications are made in the main function. Try to put a delay function after receiving a message before you send something via afSendData.

hi,Sharika Kumar

pls send me a source code link of  Bidirectional Communication between Coordinator & End Device....

pls u can send to my mail id also navorammu@gmail.com

Thanks,