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CC2541: Communication between two devices

BRUNO CHAVES
Intellectual 820 points
Part Number: CC2541
Other Parts Discussed in Thread: BLE-STACK

Hi!

I'm developing an application with two HM-11 modules that uses CC2541 MCU, the thing is that I need that one device control the other via BLE. In my case, when one GPIO of the central device change it's state it sends a message to the peripheral one to blink a LED. So, my doubt is how can I make this devices connect to each other without any visual interfaces like phones and other things?

Regards,

Bruno

  • 0
    Guru 735685 points

    I suggest you to start from SimpleBLECentral and SimpleBLEPeripheral examples in BLE-Stack to do this.

  • 0
    TI__Guru** 101460 points

    Hi Bruno,

    Please follow 's suggestions. Let us know if you need additional help!

    Regards,

  • 0 in reply to Clément
    Intellectual 820 points

    Hi, Clément and Yikai!

    I loadead SImplePeripheral and SimpleCentral on two different devices, and configured the LEDs and a periodic task to each one in a way that I will be able to monitor pairing events. So, my doubt is if both devices are supposed to scan , advertise , pair and connect to each other automatically or must I do something in the codes to it happens?

    Regards,

    Bruno.

  • 0 in reply to BRUNO CHAVES
    Guru 735685 points

    SImpleBLEPeripheral would do advertising automatically but SimpleBLECentral doesn't do scan and pairing automatically. You have to revise SimpleBLECentral by yourself. Adding GAPCentralRole_StartDiscovery at where you want to start scanning in your SimpleBLECentral application and do pairing in simpleBLEGATTDiscoveryEvent by yourself.

  • 0 in reply to YiKai Chen
    Intellectual 820 points

    Hi!

    Thanks for the reply. Is there any implemantion example of this thing I'm trying to do? I've been reasearching for days and it seems that I will spend a lot of time to actually do it, but I'm in a hurry to make it work. If are there any examples of USB dongle implementation , it would be nice too!

    Thanks,

    Bruno

  • 0 in reply to BRUNO CHAVES
    Guru 735685 points

    TI only provides generic examples to show you how BLE central and peripheral works. For specific purpose and customization, you have to do it by yourself.

  • 0 in reply to YiKai Chen
    Intellectual 820 points

    Hi, Yikai!

    I added "GAPCentralRole_StartDiscovery()" to my periodic task and now I'm trying to see the scan results with the UART. So,after studying the simpleBLEcentral.c code and the software guide I concluded that I need to use  "simpleBLECentralEventCB( gapCentralRoleEvent_t *pEvent )"  function to get scan results via  simpleBLEScanRes variable , but I don't know how to use this function on my periodic task. What  simpleBLECentralEventCB(...) parameter should be passed?  Am I supposed to create an gapCentralRoleEvent_t struct or is it already done?

  • 0 in reply to BRUNO CHAVES
    Guru 735685 points

    After you call GAPCentralRole_StartDiscovery and there is any device scanned, BLE stack would trigger "case GAP_DEVICE_DISCOVERY_EVENT:" in simpleBLECentralEventCB automatically.