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CCS/CC2640: How to read data from I2C and update data in BLE service

Jianlin Zhou
Expert 1230 points
Part Number: CC2640
Other Parts Discussed in Thread: CC2650, , TMP112, CC2650STK, BLE-STACK, TMP007

Tool/software: Code Composer Studio

Hello,

I'm working on cc2640 and want to read temperature from a TMP112 temperature sensor which is communicating through I2C. I'm using the CC2650 LP and design the prototype based on Project Zero example. I create a service and a characteristic for temperature data reading. I have realize the temperature reading in the RTOS. Could anyone tell me how to read the temperature in the project app and update the data in my service?

Thanks a lot!

  • 0
    TI__Mastermind 33460 points
    Hello,

    I would recommend one of the I2C examples from TI-RTOS with project zero.

    For example if you TI RTOS 2.20.02.18 installed then you can reference this example (it uses the STK, but the same concept applies to launchpad)

    file:///C:/ti/tirtos_cc13xx_cc26xx_2_20_01_08/examples/TI/CC2650STK/i2ctmp007/README.html
  • 0 in reply to Sean2
    Expert 1230 points
    Hello Sean,

    Thank you for your quick response. I can print the I2C temperature value on the console, but the problem is that I can not send this data to BLE service. My question is more like: how can I run a I2C task in the BLE task?

    Best,
    Jianlin
  • 0 in reply to Sean2
    Prodigy 10 points
    Hi Sean,

    I have the same problem stated by Jianlin. I was wondering whether you can follow up on it?

    Thank you so much!
  • 0 in reply to Yong Kong
    TI__Mastermind 33460 points

    Hello,

    In order to communicate with the BLE-stack a TI-RTOS task must be icall enabled. There is a section that covers adding ICALL functionality to an existing task here:

    However, what I recommend is the opposite approach. Start with a project that already has BLE in it (i.e. project zero) and add the I2C code to that task.

  • 0 in reply to Sean2
    TI__Mastermind 33460 points
    Additionally, we will have an example of reading I2C sensor data from a tmp007 and sending over BLE. it is coming soon within our simplelink academy module on dev.ti.com/tirex/#/. Stay posted.
  • 0 in reply to Sean2
    TI__Genius 12815 points

    The temperature reading SimpleLink Academy Lab that Sean referred to is now online! You can find it in SimpleLink Academy in CCS Resource Explorer or at dev.ti.com in the Software-> SimpleLink CC2640R2 SDK - v:1.30.00.25 -> SimpleLink Academy folder. It is called Bluetooth low energy + Sensors BoosterPack. Please try it out and let us know if you have any further questions!

  • 0 in reply to RachelP
    Expert 1230 points

    Thank you Rachel! I will definitely look at that example.  

  • 0 in reply to RachelP
    Expert 1230 points
    Hello Rachel,

    I have a question on the thread management regarding to this example. In the example, the as temperature is changing, which means the characteristic value is changing. In this case, will the char_changeCallBack function continuously catch the latest temperature value or the temperature measurement thread will only be activated when the client is calling for reading the value?

    Thanks,
    Jianlin
  • 0 in reply to Jianlin Zhou
    TI__Genius 12815 points

    Hi Jianlin,

    The SimpleLink Academy lab module only shows creating a new service and characteristic with read properties. So it is only updated when the device receives a read request. In order to continuously update, you would need to enable notifications. If you need help with enabling notifications, you can see Task 5 in the Custom Profile Lab

  • 0 in reply to RachelP
    Expert 1230 points
    Hello Rachel,

    I have posted another question which is on the using 32khz crustal-less model. I'm also using the project zero example on CC2650 LP. I followed the "Running Bluetooth® low energy on CC2640 Without 32 kHz Crystal" guidance.
    However, when I got the following errors when I modified the Project_Zero_APP project:

    #1965 cannot open source file "ti/drivers/power/PowerCC26XX.h" rcosc_calibration.c /ProjectZeroApp_CC2650LAUNCHXL/Startup line 54 C/C++ Problem
    #20 identifier "CCFG_MODE_CONF_VDDR_TRIM_SLEEP_TC_M" is undefined ccfg_app_ble_rcosc.c /ProjectZeroApp_CC2650LAUNCHXL/Startup line 461 C/C++ Problem
    #20 identifier "CCFG_MODE_CONF_VDDR_TRIM_SLEEP_TC_S" is undefined ccfg_app_ble_rcosc.c /ProjectZeroApp_CC2650LAUNCHXL/Startup line 461 C/C++ Problem
    #20 identifier "CCFG_SIZE_AND_DIS_FLAGS_DIS_GPRAM_M" is undefined ccfg_app_ble_rcosc.c /ProjectZeroApp_CC2650LAUNCHXL/Startup line 460 C/C++ Problem
    #20 identifier "CCFG_SIZE_AND_DIS_FLAGS_DIS_GPRAM_S" is undefined ccfg_app_ble_rcosc.c /ProjectZeroApp_CC2650LAUNCHXL/Startup line 460 C/C++ Problem
    #20 identifier "PowerCC26XX_calibrate" is undefined CC2650_LAUNCHXL.c /ProjectZeroApp_CC2650LAUNCHXL/Startup line 102 C/C++ Problem
    #20 identifier "PowerCC26XX_Config" is undefined CC2650_LAUNCHXL.c /ProjectZeroApp_CC2650LAUNCHXL/Startup line 99 C/C++ Problem
    #20 identifier "PowerCC26XX_standbyPolicy" is undefined CC2650_LAUNCHXL.c /ProjectZeroApp_CC2650LAUNCHXL/Startup line 101 C/C++ Problem
    gmake: *** [Startup/CC2650_LAUNCHXL.obj] Error 1 ProjectZeroApp_CC2650LAUNCHXL C/C++ Problem



    1.Could you please tell me how to set the correct configuration and enable RCOSC_LF?

    2.Besides, I will use the 4*4 CC2640 package, what board configuration should I change? I found almost every example is based on 7*7 package chip. Could you please provide an example on the small package chip?

    Thanks,
    Jianlin