CC2640: PWM

Hello Richard,

I might not have time to follow you through stepbystep the whole process, but I can try to run the PWM example on CC2650LP and let you know how that works.

C:\ti\tirtos_cc13xx_cc26xx_2_21_01_08\examples\TI\CC2650_LAUNCHXL\pwmled

Questions:

1. Do you have a TI DK (launchpad) to prototype on?

2. Do you have a logic analyzer to verify output signals on PINs? If not this is highly recommended.

Notes:

1. please use the latest release ble_sdk_2_02_02_25 and tirtos_cc13xx_cc26xx_2_21_01_08.

2. In the release notes for ble_sdk_2_02_02_25 the recommended and tested CCS version and compiler version is:

CCS 7.4.0 (Build 15 or later) with  TI ARM Compiler 16.9.4.LTS

I ran the pwmled example successfully on the LP. I had to change the sleep duration for it to work smoothly:

//    tskParams.arg0 = 50;
    tskParams.arg0 = 5000;

You can also increase pwmPeriod to reduce intensity even further in addition to controlling the duty cycle (duty)

When you integrate with a ble stack example try to disable power saving during implementation (xPOWER_SAVING).

Hi, I used Oscilloscope to check but there are not PWM  signal on desire GPIO port. I have a confusion:

- I integrated PWM Driver into current TI KeyFob sample project and compiled, executed successfully.

hPWM = PWM_open(CC2650_PWM0, &params);

hPWM is not NULL when finishing PWM_open.

I turn LED on before invoking pwm_job, PWM is not working

I turned LED off before invoking pwm_job, PWM is not working also.

In my program structure, I defined 2 function: pwm_int and pwm_job

pwm_int will be initialized only one time when the program start.

pwm_job will be in the  loop

//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

static void KeyFobDemo_taskFxn(UArg a0, UArg a1){

// Initialize application

 KeyFobDemo_init();

 ///////////////////////////////////////////////////////////

 // Application main loop

 for (;;)

 {

    .......

    .......

    .......

    if (events & KFD_APR_EVT)

   {

     events &= ~KFD_APR_EVT;

     apr_drv();

   }

    .............

    .............

    .............

 }

}

//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

static void KeyFobDemo_init(void)

{

      .........

      .........

      apr_inz();

}

//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

*****************************************
*										*
*			Initialize					*
*										*
****************************************
*/
void apr_inz( void )
{
  ......
  ......
  pwm_int();
}

/*
*****************************************
**
*			                *
*					*
*****************************************
*/
void apr_drv( void )
{
  BYTE i;
  sw_job();
  ad_job();
  ble_connect_job();
  blower_job();
  check_charge();
  led_job();
  pwm_job(); 
  sw_clear();
   .........
   ..........
}
/*
*****************************************
*                                       *
*                                       *
*                                       *
*****************************************
*/
static void pwm_int(void)   //hvi1hc
{
    PWM_Params params;
    //uint16_t   pwmPeriod = 3000;      // Period and duty in microseconds
    //uint16_t   duty      = 0;
    //uint16_t   dutyInc   = 100;

    PWM_Params_init(&params);
    //params.dutyUnit = PWM_DUTY_US;
    params.dutyUnit = PWM_DUTY_FRACTION;
    params.dutyValue = 10;
    //params.periodUnit = PWM_PERIOD_US;
    params.periodUnit = PWM_PERIOD_US;
    params.periodValue = pwmPeriod;
    //pwm1 = PWM_open(Board_PWM0, &params);
    hPWM = PWM_open(CC2650_PWM0, &params);

    if (hPWM == NULL) {
        //System_abort("Board_PWM0 did not open");
        Task_exit();
    }
    PWM_start(hPWM);
}

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

static void pwm_job(void)
{

    PWM_setDuty(hPWM, duty);
    duty = (duty + dutyInc);
    if (duty == pwmPeriod || (!duty)) {
        dutyInc = - dutyInc;
    }

}

4540.EMAIL CLARIFICATION.html

I also attached an email (HTML format) which described detail Steps I did to integrate PWM Driver into TI KeyFob Code.

Kindly take a look and let me know if any.

Many Thanks!