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CC2541 sample code for IR Generation & Learning

Rushit Gandhi
Prodigy 85 points
Other Parts Discussed in Thread: CC2541, CC2538, CC2530, CC2533

We want to add the IR Generation & Learning in our CC2541 based device,

so can you please provide me the details on how can we do it with a sample code for it ?

From (http://www.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=swra323) I could know that 

HAL files for the NEC,SIRC & RC5 were available for CC2538 is it available for CC2541 if yes please guide me how can i add it into our simple BLE Peripheral device & If it is not can you provide me the HAL files & procedure to add it?

  • 0
    TI__Guru** 106705 points

    Hi Rushit,

    The files you are linking to are for CC2530 and CC2533. These are very similar devices to the CC2541 so you should be able to use the code as-is.

    Cheers,
    Fredrik

  • 0 in reply to Fredrik K
    Prodigy 85 points

    fedrik : Thanks for the response but i am not able to access therefore codes & get it,therefore trying to work on the procedures given by CC2541's user guide to get the IR signal out by timer 1 & Timer 3.

    1.Please tell me how to do the calculation to set the value of T3CC1(duty cycle = 33%) & T3CC0 (period to have carrier 38Khz waveform).If possible with example 

    2.Please tell me how to do the calculation to set the value of T1CCH0 & L0(mark = 560 us) & T1CCH1 & L1 (total ). If possible with example

    3.On which Peripheral pin i will get the IR out signal(I tried to look on every pin but cannot get it) & setting for that?

    Please find below my code for the Details :

    T1CTL = 0x02;Configuration
    T1CCTL0 = 0x64;Configuration
    T3CCTL0 = 0x64;Configuration


    T3CC1 = 127; // Carrier wave duty cycle Need to Calculate
    T3CC0 = 0xff; // PWM signal period Need to Calculate

    T3CTL = 0x12; // start */ ; Is it required in our case ?

    T1CC0H = 0x12;  // Need to Calculate
    T1CC0L = 0x12;  // Need to Calculate
    T1CC1H = 0x06;  // Need to Calculate
    T1CC1L = 0x06;  // Need to Calculate

    I am running short on time & could not find details or any example code on this,so please guide me on this asap?

  • 0 in reply to Rushit Gandhi
    TI__Guru** 106705 points

    Hi Rushit,

    What do you mean you are not able to get the code? It is a link to a zip file on the page you are linking to in your first post.

    BR,

    Fredrik

  • 0 in reply to Rushit Gandhi
    TI__Guru** 106705 points

    The IR signal will be output on P1.1.


    Fredrik

  • 0 in reply to Fredrik K
    Prodigy 85 points
    Thanks Fredrik for the details.
  • 0 in reply to Fredrik K
    Prodigy 20 points
    Hey Fredrik
    Is there a provision to redirect the IR out to an alternate pin instead of the P1.1.....??


    MSR
  • 0 in reply to Mohit Singh Rathod
    Prodigy 20 points

    Well no worries it seems the IR out is just T1 Ch1 out so using alternate location -1 for timer 1 the IR-OUT signal can be obtained on P0.3 as well.



    --
    MSR

  • 0 in reply to Mohit Singh Rathod
    Prodigy 85 points

    Just for your Info : CC2541 user guide page no.79 section 7.3(GPIO) : "The output drive strength is 4 mA on all outputs, except for the two high-drive outputs, P1.0 and P1.1,which each have 20-mA output drive strength".

    On P0.3 you will get only 4mA output current,Therefore IR out is recommended to be on P1.1 which have 20mA output current.