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Starterware/CC1350: PWM Support

Tim Simerly
Genius 9985 points
Part Number: CC1350
Other Parts Discussed in Thread: CC2650

Tool/software: Starterware

Dear Support:

It's not clear from reading the data sheet - can you tell me how many PWM outputs can be supported with the CC1350 and CC2650?  In providing me a number, can you provide a reference as to how you came up with the number?

Thanks,
Tim

  • 0
    TI__Genius 9985 points

    Dear Support:

    Resending - ok, I'm going to guess.  I say it's 8.  Is that correct and if so where is the documentation that makes this crystal clear?  Please advise.

    Thanks,
    Tim

  • 0 in reply to Tim Simerly
    TI__Expert 6540 points

    Hi Tim, I have never actually tried running all PWM outputs at the same time, but I also believe you can run 8 16bit PWM's or 4 32bit PWM's.

    In driverlib file PWMTimerCC26XX.h, the function:

    /*!
*  @brief  PWMTimer26XX Hardware attributes
*
*  These fields are used by the driver to set up underlying PIN and GPTimer
*  driver statically. A sample structure is shown below:
*
*  @code
*  // PWM configuration, one per PWM output
*  PWMTimerCC26XX_HwAttrs pwmtimerCC26xxHWAttrs[CC2650_PWMCOUNT] = {
*   { .pwmPin = CC2650_LAUNCHXL_PWMPIN0, .gpTimerUnit = CC2650_LAUNCHXL_GPTIMER0A } ,
*   { .pwmPin = CC2650_LAUNCHXL_PWMPIN1, .gpTimerUnit = CC2650_LAUNCHXL_GPTIMER0B } ,
*   { .pwmPin = CC2650_LAUNCHXL_PWMPIN2, .gpTimerUnit = CC2650_LAUNCHXL_GPTIMER1A } ,
*   { .pwmPin = CC2650_LAUNCHXL_PWMPIN3, .gpTimerUnit = CC2650_LAUNCHXL_GPTIMER1B } ,
*   { .pwmPin = CC2650_LAUNCHXL_PWMPIN4, .gpTimerUnit = CC2650_LAUNCHXL_GPTIMER2A } ,
*   { .pwmPin = CC2650_LAUNCHXL_PWMPIN5, .gpTimerUnit = CC2650_LAUNCHXL_GPTIMER2B } ,
*   { .pwmPin = CC2650_LAUNCHXL_PWMPIN6, .gpTimerUnit = CC2650_LAUNCHXL_GPTIMER3A } ,
*   { .pwmPin = CC2650_LAUNCHXL_PWMPIN7, .gpTimerUnit = CC2650_LAUNCHXL_GPTIMER3B } ,
*  };
*    @endcode
*/
typedef struct PWMTimerCC26XX_HwAttrs
{
    PIN_Id  pwmPin;               /*!< PIN to output PWM signal on */
    uint8_t gpTimerUnit;          /*!< GPTimer unit index (0A, 0B, 1A..) */
} PWMTimerCC26XX_HwAttrs;

    ...states 8 PWM configurations, but I see that they are ‘grouped’ as A and B. I guess this correlates to the fact that you can have up to 4 32bit PWMs and 8 16bit PWM configurations.

    The CC1350_LAUNCHXL board file states:
    #define Board_PWM0              CC1350_LAUNCHXL_PWM0
#define Board_PWM1              CC1350_LAUNCHXL_PWM1
#define Board_PWM2              CC1350_LAUNCHXL_PWM2
#define Board_PWM3              CC1350_LAUNCHXL_PWM3
#define Board_PWM4              CC1350_LAUNCHXL_PWM4
#define Board_PWM5              CC1350_LAUNCHXL_PWM5
#define Board_PWM6              CC1350_LAUNCHXL_PWM6
#define Board_PWM7              CC1350_LAUNCHXL_PWM7
  • 0 in reply to FredG
    TI__Genius 9985 points
    Hey Fred:

    Thanks for responding - yes I saw this in the code which is why I was thinking 8. Although the datasheet wasn't clear on this, I do see the section on Timers in the TRM does specifically indicate that it is 8 which is consistent with the code above. I think I am clear on this now.

    Thanks,
    Tim