CC2652P: BLE observer from Simple_central example

Tomas Varela

Part Number: CC2652P
Other Parts Discussed in Thread: SYSCONFIG

Hello,

We are developing a BLE observer for beacons. For this, we based our CC2652P firmware on the simple_central example and we are using LAUNCHXL-CC1352P-2 development kit. I need this observer to scan continuously and without restrictions of amount of devices.

In order to have this working, I had to made a few changes to the project and I would like you to validate them:

Set DEFAULT_MAX_SCAN_RES to 0.
GAP device init with GAP_PROFILE_OBSERVER.
Set Scan Type to Passive; Scan Interval to 150ms, Scan Window to 150ms and Scan Duration to 5000ms.
I start discover using SimpleCentral_doDiscoverDevices(0) in two places: when GAP_DEVICE_INIT_DONE_EVENT and after SC_EVT_SCAN_DISABLED.
I print beacon's data in SimpleCentral_processAppMsg.

However, I still have some problems:

In https://dev.ti.com/tirex/explore/node?node=AKvX4BPHvI6W3ea9a0OTxA__pTTHBmu__LATEST&r=krol.2c__3.10.00.15 it says that I should set DEFAULT_SCAN_DURATION to 0. However, as you can see in this picture, I cannot. Does this affect my "continuously scanning"?

If I use UUID filter, should I do something with numScanRes? I don't fully understand what is the scanned device list used for.

And finally, my biggest problem is with the display/UART. I need the CC2652 to send beacon's data to another MCU that will process it. I am having issues disabling the display in order to use a simple UART just to send data bytes. How should I do this? I have already disabled Menu and Two button menu and I thought that display_printf would just write the dat over the UART but it does write other characters related to display management too. I have seen https://dev.ti.com/tirex/content/simplelink_academy_cc13x0sdk_2_10_02_10/modules/debug/debugging_output/debugging_output.html but I cannot understand how to implement it in this case.

Thanks!

over 5 years ago

0 Marie H over 5 years ago

TI__Guru* 83011 points

Hi Tomas,

What version are you using? (This looks like a known issue that we fixed in SimpleLink CC13x2/CC26x2 SDK 3.40.)

Regarding the UART, it sounds like the display driver is still configured to use uart. Please open the Display view in Sysconfig and double-check this.

0 Tomas Varela over 5 years ago in reply to Marie H

Intellectual 575 points

Hi Marie,

I am using SimpleLink CC13x2 26x2 SDK (4.10.00.78). How can I be sure that my device will continuously be scanning?

Regarding the UART, I managed to remove Display and I am using now UART_write, is that ok?

EDIT: UART PROBLEM

I have this code in order to send beacon data through UART:

                   uint8 beacon_len = 6 + 1 + pAdvRpt->dataLen;
                   uint8 txbuf[beacon_len];
                   txbuf[6] = pAdvRpt->rssi;
                   memcpy(txbuf, pAdvRpt->addr, 6);
                   memcpy(&txbuf[7], pAdvRpt->pData, pAdvRpt->dataLen);
                   UART_write(handle, txbuf, beacon_len);

txbuf is in 0x200062DC as seen in the picture:

and beacon_len is 25 so I would expect to receive A8 70 FE 0D D5 E2 DA 02 01 06 03 03 DE DE 07 FF DE DE 00 72 A2 FD 02 0A 08

However, I am receiving A8 70 FE 0D D5 E2 DA 02 01 06 03 03 DE DE 07 FF DE DE 00 72 A2 FD 02 0A 0D 08

I don't understand where is that 0D coming from and why is UART_write printing more bytes than the amount that is told to...

Solved: (it was a carriage return)

  UART_init();
  UART_Params_init(&params);
  params.writeDataMode = UART_DATA_BINARY;
  handle = UART_open(CONFIG_UART_0, &params);

Thanks!

0 Tomas Varela over 5 years ago in reply to Marie H

Intellectual 575 points

Hi Marie,

Is there any solution to my continuously scanning problem? Everything else is working OK, I just need to make sure that I am being a Beacon Observer 100% of the time.

Thanks!

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CC2652P: BLE observer from Simple_central example