bl_mcu_sdk/examples/dsp/HelperFunctions/ref_helper.c

#include "ref.h"

float32_t scratchArray[8192 * 2];

riscv_cfft_instance_f32 ref_cfft_sR_f32_len8192 = {8192, 0, 0, 0};

q31_t ref_sat_n(q31_t num, uint32_t bits)
{
    int32_t posMax, negMin;
    uint32_t i;

    posMax = 1;
    for (i = 0; i < (bits - 1); i++) {
        posMax = posMax * 2;
    }

    if (num > 0) {
        posMax = (posMax - 1);

        if (num > posMax) {
            num = posMax;
        }
    } else {
        negMin = -posMax;

        if (num < negMin) {
            num = negMin;
        }
    }
    return (num);
}

q31_t ref_sat_q31(q63_t num)
{
    if (num > (q63_t)INT_MAX) {
        return INT_MAX;
    } else if (num < (q63_t)0xffffffff80000000ll) {
        return INT_MIN;
    } else {
        return (q31_t)num;
    }
}

q15_t ref_sat_q15(q31_t num)
{
    if (num > (q31_t)SHRT_MAX) {
        return SHRT_MAX;
    } else if (num < (q31_t)0xffff8000) {
        return SHRT_MIN;
    } else {
        return (q15_t)num;
    }
}

q7_t ref_sat_q7(q15_t num)
{
    if (num > (q15_t)SCHAR_MAX) {
        return SCHAR_MAX;
    } else if (num < (q15_t)0xff80) {
        return SCHAR_MIN;
    } else {
        return (q7_t)num;
    }
}

float32_t ref_pow(float32_t a, uint32_t b)
{
    uint32_t i;
    float32_t r = a;

    for (i = 1; i < b; i++) {
        r *= a;
    }

    if (b == 0) {
        return 1;
    }

    return r;
}