How do I Send UUID Address as one string (via UART)?

[StKe_3927516]

I have a custom board that, among other things, includes the cyble 222014-01 and a cell modem. I have basic UART working between the modules. I need to be able to send the BLE's UUID as one string to the Cell Modem, but I am having issues.

(please be nice to me, if this is a simple fix; I am new-ish to embedded and C)

I found basic code to print the UUID (as multiple prints):

                localAddr.type = 0u;

                CyBle_GetDeviceAddress(&localAddr);

                for(i = CYBLE_GAP_BD_ADDR_SIZE; i > 0u; i--)

                {

                    DBG_PRINTF("%2.2x", localAddr.bdAddr[i-1]);

                }

My current code is (btw, I've tried many variations):

                        localAddr.type = 0u;

                        if(CyBle_GetDeviceAddress(&localAddr) == CYBLE_ERROR_OK){

                            for(uint k = CYBLE_GAP_BD_ADDR_SIZE; k > 0u; k--){

                                char tempChar;

                                sprintf(&tempChar, "%d", localAddr.bdAddr[i-1]);

                                ThisAddress = (unsigned char)tempChar;

                            }

                        }

And, it sends:

{000000_lqç[M߇МN@²]×èvqÑÉ£Us>/•Ú«<SI>¿©ÝÄ.¬H}ù¡ÒŸÇßRœÂßtÞŒ*géú#ìôýûß×ýyjÖé<DLE>ë#<ETX>S+½8U\íþÖ"Å<SYN>“aÊÕÎÁ<SO>×GIÿÆ—îë+ÄÃéŒÿZç½ä~Ûeé6gvÙë¯Ïß<GS>“ÇÐñ„)|]ÆÆ7×<DC3/XOFF>‰·Ø÷øYR—WÙvKu™7*Äѧìò<DC1/XON>Ž¬þ'衈p5µµÓ7ùh—¯¦ê”פ¯–_žs©<NAK>éR5½§FÚíW6ùw<EM>XíÿL¾«®Ú밍œêÏÅîÝi‡iulœü˜¡Ô=<ENQ>Fû¶ç<STX>>Ì»´ÿîÿ{ÿºÿV½<DEL>ŸAT

[StKe_3927516]

With my code changed to:

                        localAddr.type = 0u;

                        if(CyBle_GetDeviceAddress(&localAddr) == CYBLE_ERROR_OK){

                            for(uint k = CYBLE_GAP_BD_ADDR_SIZE; k > 0u; k--){

                                char tempChar;

                                //sprintf(&tempChar, "%d", localAddr.bdAddr[i-1]);

                                //ThisAddress = (unsigned char)tempChar;

                                sprintf(&tempChar, "%2.2x", localAddr.bdAddr[i-1]);

                                SendCommand(&tempChar);

                            }

                        }

It now prints/sends: 000000000000

In topdesign, I set the BLE to "Silicon generated "Company assigned" part of device address"

[GyanC_36]

Hi Steve,

  Were you able to get the data over UART ?

You can refer code examples from below link ...where some of the examples do send the device address over UART.

https://github.com/cypresssemiconductorco/PSoC-4-BLE/tree/master/100_Projects_in_100_Days

-Gyan

[StKe_3927516]

Hi Gyan,

I have not been able to get it to work.

Thank you for the resource. Do you know which one(s)?

-Steve

[StKe_3927516]

I have code that now gives me this:

804929199580

When the actual UUID is:

00a0509ab3d5

Am I missing a conversion somewhere?

[MiRo_263836]

Looking like you are sending decimal but you want to send hex.  Use the debugger and see what tempChar is each time before you do the SendCommand.

[ScottKerstein]

Hello Steve,

Could you post the code which gave you this result, please?

"I have code that now gives me this:

804929199580

When the actual UUID is:

00a0509ab3d5"

The CyBle_GetDeviceAddress() function needs to be called after CYBLE_STACK_ON, i.e. after the stack has been initialized. If you call it before that, the function might return invalid data.

Scott

[StKe_3927516]

                    if(CYBLE_EVT_STACK_ON){

                        localAddr.type = 0x00; //public = 0, Random = 1

                        CYBLE_API_RESULT_T CyBle_GetDeviceAddress(CYBLE_GAP_BD_ADDR_T* localAddr);

                        if(CyBle_GetDeviceAddress(&localAddr) == CYBLE_ERROR_OK){

                            for(uint8 k = CYBLE_GAP_BD_ADDR_SIZE; k > 0; k--){

                                char tempChar;

                                sprintf(&tempChar, "%.2x", (unsigned char)localAddr.bdAddr[k-1]);

                                SendCommand(&tempChar); //send command via uart

                            }

                        }

                    }

[ScottKerstein]

Confirm that the BLE stack component has been started.

This example code was taken from "Day 25" main.c.

int main()
{

    /* Start BLE component */
    CyBle_Start(AppCallBack);

.

.

.

.

void AppCallBack(uint32 event, void* eventParam)

{

    CYBLE_API_RESULT_T apiResult;

    CYBLE_GAP_BD_ADDR_T localAddr;

    uint32  i = 0u;

    switch (event)

    {

        /**********************************************************

        *                       General Events

        ***********************************************************/

        case CYBLE_EVT_STACK_ON: /* This event received when component is Started */

            /* Enter into discoverable mode so that remote can search it. */

            apiResult = CyBle_GappStartAdvertisement(CYBLE_ADVERTISING_FAST);

            if(apiResult != CYBLE_ERROR_OK)

            {

                DBG_PRINTF("StartAdvertisement API Error: %d \r\n", apiResult);

            }

            DBG_PRINTF("Bluetooth On, StartAdvertisement with addr: ");

            localAddr.type = 0u;

            CyBle_GetDeviceAddress(&localAddr);

            for(i = CYBLE_GAP_BD_ADDR_SIZE; i > 0u; i--)

            {

                DBG_PRINTF("%2.2x", localAddr.bdAddr[i-1]);

            }

            DBG_PRINTF("\r\n");

            break;

        case CYBLE_EVT_HARDWARE_ERROR:    /* This event indicates that some internal HW error has occurred. */

            DBG_PRINTF("CYBLE_EVT_HARDWARE_ERROR\r\n");

            break;

[StKe_3927516]

My 'if' statement makes sure the BLE stack is on. -- it is turned on in another part of the code.

When my code is run on the device, it goes into the 'if' statement, therefore, it is on.

[ScottKerstein]

Hmmm.  What does the debugger see for tempChar each time before if does the SendCommand?

[StKe_3927516]

While in debug mode,

the localAddr.bdAddr is:

0x80

0x95

0x19

0x29

0x49

0x80

When going through the loop, the TempChar is:

0x38 '8'

0x34 '4'

0x32 '2'

0x31 '1'

0x39 '9'

0x38 '8'

BTW, if I do "random," it is all 0x00

And, it doesn't matter if I check the "Silicon generated "Company assigned" part of device" in GAP settings or not.

[MotooTanaka]

Hi,

May be I'm off the point, but I'd rather write something like

=======

for (uint k = CYBLE_GAP_BD_ADDR_SIZE; k > 0u ; k--) {

    char tempChar[3] ;

    sprintf(tempChar, "%02x", localAddr.bdAddr[k-1] ;

    SendCommand(tempChar) ;

}

=======

moto

[StKe_3927516]

Moto,

That makes more sense for the TempChar part, but it still doesn't answer why the address is wrong compared to what is being shown when advertised.

-Steve

[StKe_3927516]

Just so you all know, this is saying the device address is 804929199580 no matter which device I program/use.

This thread/question also mentions the same address PRIVACY :LE Create Connection Command

[StKe_3927516 · Accepted solution]

I got it!

I had to put CyBle_ProcessEvents();  after the  CyBle_Start(AppCallBack);  for some reason.

Maybe because I start my UART before the BLE.

Either way, I have it working.

ps - why does the default example code print the MAC Address (UUID) backwards?