MSP430FR6007: LEA usage issue

Hi team,

The customer has the following 2 questions when testing LEA:

1. The customer uses the result obtained by adc and directly multiplies by LEA, and the result is incorrect: (The complete code is here)

void main(void)
{
    msp_status status;
    msp_mpy_iq31_params mpyParams;
    msp_fft_iq31_params fftParams;
    
    // ----ADC Raw data ----------
    _q15 test[SAMPLES] = {22, 23, 17, 12, 15, 15, 17, 27, 24, 17, 17, 22, 18, 24, 24, 19, 18, 23, 21, 16, 16, 16, 14, 16, 24, 21, 13, 18, 17, 0, 10, 68, 79, -16, -95, -12, 170, 163, -95, -235, 20, 333, 204, -241, -355, 77, 475, 244, -338, -452, 114, 598, 282, -437, -547, 145, 688, 325, -475, -624, 114, 747, 385, -510, -691, 112, 817, 445, -531, -748, 101, 855, 470, -539, -782, 79, 868, 500, -541, -813, 58, 885, 522, -545, -831, 60, 896, 533, -527, -808, 53, 845, 477, -496, -682, 104, 676, 292, -376, -414, 74, 366, 198, -85, -153, -53, 52, 121, 136, 31, -152, -177, 70, 318, 211, -184, -374, -38, 431, 386, -174, -513, -134, 485, 475, -180, -567, -136, 497, 468, -162, -503, -144, 381, 400, -57, -377, -171, 271, 369, 14, -307, -194, 176, 310, 71, -210, -173, 106, 249, 88, -144, -138, 68, 192, 81, -91, -108, 36, 135, 72, -42, -61, 22, 96, 70, -11, -42, 9, 69, 56, -4, -25, 11, 49, 46, 7, -15, 13, 49, 41, 16, 6, 12, 26, 26, 8, -4, 10, 33, 35, 17, 11, 23, 23, 23, 20, 11, 11, 20, 31, 24, 16, 22, 24, 23, 24, 14, 12, 16, 22, 25, 22, 18, 17, 25, 26, 20, 16, 16, 20, 17, 21, 22, 14, 10, 18, 24, 19, 15, 17, 16, 22, 37, 28, 17, 12, 16, 28, 28, 9, 3, 19, 30, 20, 12, 14, 20, 26, 29, 22, 6, 14, 30, 40, 20};
    uint16_t i =0 ;

    /* Disable WDT */
    WDTCTL = WDTPW + WDTHOLD;

#ifdef __MSP430_HAS_PMM__
    /* Disable GPIO power-on default high-impedance mode for FRAM devices */
    PM5CTL0 &= ~LOCKLPM5;
#endif

    /* Initialize input signal and Hamming window */
//    initSignal();
//    initHamming();
    //--------The ADC raw value is assigned to input here .
    for(i = 0; i < SAMPLES;i++){
        input[i] = test[i];
        window[i] = 2;
    }
    /* Multiply input signal by generated Hamming window */
    mpyParams.length = SAMPLES;
    //--------First multiply the original ADC value by 2, and the result here is not right 
    status = msp_mpy_iq31(&mpyParams, input, window, input);
    msp_checkStatus(status);
    
   //--------------Because the previous calculation is incorrect, does the FFT have any meaning here? 
    /* Initialize the fft parameter structure. */
    fftParams.length = SAMPLES;
    fftParams.bitReverse = 1;
    fftParams.twiddleTable = msp_cmplx_twiddle_table_256_q15;

    /* Perform real FFT with no scaling */
    msp_benchmarkStart(MSP_BENCHMARK_BASE, 64);
    status = msp_fft_iq31(&fftParams, input);
    cycleCount = msp_benchmarkStop(MSP_BENCHMARK_BASE);
    msp_checkStatus(status);
    
    /* End of program. */
    __no_operation();
}

2. How to multiply the result of the ADC acquisition int integer data LEA, if it's needed to convert to use? This conversion is very time consuming if using an operational conversion. Is it possible to provide relevant application cases for reference?

Could you help resolve this case? Thanks!

Best Regards,

Cherry