how to config the Prescaler of the Timer.

The driver is taking care of this for you.

Please see that function

static void GPTimerCC26XXSetLoadMatch(GPTimerCC26XX_Handle handle, GPTimerCC26XX_Value loadMatchVal, uint32_t regPre, uint32_t regLoadMatch)

It extracts bit[16:23] of loadMatchVal and write it into prescaler.

/*!
 *  @brief  Shared code to be used by GPTimerCC26XX_setLoadValue / GPTimerCC26XX_setMatchValue
 *          Sets load/match values using input value and register offset for
 *          prescaler and load/match register
 *          Functions calling this should specifiy which the register offset
 *          within the module base to the corresponding timer A register.
 */
static void GPTimerCC26XXSetLoadMatch(GPTimerCC26XX_Handle handle, GPTimerCC26XX_Value loadMatchVal, uint32_t regPre, uint32_t regLoadMatch)
{
    /* Get the pointer to the object and hwAttrs */
    GPTimerCC26XX_HWAttrs const *hwAttrs = handle->hwAttrs;
    GPTimerCC26XX_Object        *object  = handle->object;
    uint32_t offset = GPT_LUT[handle->timerPart].offset;

    /* Split value into correct timer and prescaler register for 16 bit modes. */
    if (object->width == GPT_CONFIG_16BIT)
    {
        /* Upper byte is used by prescaler */
        uint8_t prescaleValue = 0xFF & (loadMatchVal >> 16);
        /* Discard upper byte (24 bits max) */
        loadMatchVal &= 0xFFFF;

        /* Set prescale value */
        HWREG(hwAttrs->baseAddr + offset + regPre) = prescaleValue;
    }

    /* Set load / match value */
    HWREG(hwAttrs->baseAddr + offset + regLoadMatch) = loadMatchVal;
}

i set the match value to be 0x3FFFE~0xFFFFFF, Maximum Time is always 2.7ms.

i think there must be other problems. could you give me  some examples about how to config the Timer?

hanks a lot!！

You can find the timer example on the driver file. The official support version is in TI-RTOS 2.20.

TI-RTOS can be downloaded here :

The GPTimer driver can be found here after downloaded :

C:\ti\tirtos_cc13xx_cc26xx_2_20_01_08\products\tidrivers_cc13xx_cc26xx_2_20_01_10\packages\ti\drivers\timer

in GPTimerCC26xx.h, there is code snippet of how to configure timer:

   GPTimerCC26XX_Handle hTimer;
   void timerCallback(GPTimerCC26XX_Handle handle, GPTimerCC26XX_IntMask interruptMask) {
       // interrupt callback code goes here. Minimize processing in interrupt.
   }
 
   void taskFxn(UArg a0, UArg a1) {
     GPTimerCC26XX_Params params;
     GPTimerCC26XX_Params_init(&params);
     params.width          = GPT_CONFIG_16BIT;
     params.mode           = GPT_MODE_PERIODIC_UP;
     params.debugStallMode = GPTimerCC26XX_DEBUG_STALL_OFF;
     hTimer = GPTimerCC26XX_open(CC2650_GPTIMER0A, &params);
     if(hTimer == NULL) {
       Log_error0("Failed to open GPTimer");
       Task_exit();
     }
 
     Types_FreqHz  freq;
     BIOS_getCpuFreq(&freq);
     GPTimerCC26XX_Value loadVal = freq.lo / 1000 - 1; //47999
     GPTimerCC26XX_setLoadValue(hTimer, loadVal);
     GPTimerCC26XX_registerInterrupt(hTimer, timerCallback, GPT_INT_TIMEOUT);
 
     GPTimerCC26XX_start(hTimer);
 
     while(1) {
       Task_sleep(BIOS_WAIT_FOREVER);
     }
   }

Dear Christin,

i have done these, it works as excepted.but the Timer Max period is 2.7ms,so i want to config the TAPR =0x04
i use the Driver: cc26xx_2_20_00_08.
in the GPTimerCC26xx.h,i find no function to config the TAPR register, so I have been looking for a way to config the TAPR,Does the new version cc26xx_2_20_01_08 include this function to config the TAPR?

Regards,
LiNan

Dear Christin,

I have solved this proble.i make a miske :

i called the function :

GPTimeCC26XX_setMatchValue() rather than GPTimeCC26XX_setLoaderValue() 

so the Timer worked error.

Thank u for your help and your patience!

Regards,

LiNan