TMS570LS1227: code run too long

Part Number: TMS570LS1227

Team

I test the time that the below function consume, and found that it need to take about 1 microsecond, the platform is TMS570LS1227 with 180Mhz.

         adcStartConversion(adcREG1,adcGROUP1);

It seem the code is not long, why need to take about 1 microsecond to run?

void adcStartConversion(adcBASE_t *adc, uint32 group)
{
    uint32 index = (adc == adcREG1) ? 0U : 1U;

/* USER CODE BEGIN (7) */
/* USER CODE END */

    /** - Setup FiFo size */
    adc->GxINTCR[group] = s_adcFiFoSize[index][group];

    /** - Start Conversion */
    adc->GxSEL[group] = s_adcSelect[index][group];

    /**   @note The function adcInit has to be called before this function can be used. */

/* USER CODE BEGIN (8) */
/* USER CODE END */
}