RM开发

uint32_t lut_cal(uint32_t *lut, uint32_t x_base, uint32_t x_step, uint32_t index_base,
    uint32_t in_max, uint32_t in_data, uint32_t lut_sz) {
        
    uint32_t index_off = (in_data - x_base) >> x_step;
    uint32_t index = index_off + index_base;
    assert(index < lut_sz && index >= 0);
    uint32_t y0 = lut[index];
    uint32_t y1 = lut[min(index + 1, lut_sz - 1)];
    uint32_t frac = in_data - ((index_off << x_step) + x_base);
    uint32_t y;    
    assert(y1 >= y0);
    if (in_data <= in_max) {
        y = (((y1 - y0) * frac) >> x_step) + y0;
    } else {
        y = y0;
    }
    return y;
}