#include <stdio.h>
#include <stdint.h>

/* Clarke transform test - compile with ARM GCC */
#define Q15_MULT(a, b) (((int32_t)(a) * (int32_t)(b)) >> 15)
#define ONE_OVER_SQRT3_Q15  18919  /* Q15: 1/√3 */

typedef struct {
    int16_t Alpha;
    int16_t Beta;
} Clarke_t;

void Clarke_Transform(int16_t Ia, int16_t Ib, Clarke_t *out) {
    out->Alpha = Ia;
    int32_t tmp = (int32_t)Ia + 2 * (int32_t)Ib;
    out->Beta  = (int16_t)(Q15_MULT((int16_t)tmp, ONE_OVER_SQRT3_Q15));
}

int main(void) {
    Clarke_t out;
    Clarke_Transform(10000, -5000, &out);
    printf("Ia=%d, Ib=%d -> Ialpha=%d, Ibeta=%d\n", 10000, -5000, out.Alpha, out.Beta);
    printf("ARM GCC compile test: PASS\n");
    return 0;
}