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Improve code in calibration module

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Mario Hüttel 2020-11-02 18:20:17 +01:00
parent e37001e3c4
commit 7b1ae3bdc6
1 changed files with 27 additions and 26 deletions
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53
stm-firmware/calibration.c
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@ -92,7 +92,7 @@ static float calculate_mean(float *values, uint32_t count)
} while (--loop_cnt > 0);
}
return sum/(float)count;
return sum / (float)count;
}
static float calculate_standard_deviation(float *values, uint32_t count, float mean)
@ -103,35 +103,36 @@ static float calculate_standard_deviation(float *values, uint32_t count, float m
float res;
switch (remainder) {
case 0: do { sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 7: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 6: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 5: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 4: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 3: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 2: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 1: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 0: do {
sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 7: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 6: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 5: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 4: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 3: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 2: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
case 1: sum += (*values - mean) * (*values - mean);
values++;
/* FALLTHRU */
} while (--loop_cnt > 0);
}
sum /= (float)count;
/* Compute the square roor using the FPU.
/* Compute the square root using the FPU.
* The constraint 't' tells GCC to use a floating point register
*/
__asm__ __volatile__("vsqrt.f32 %0, %1" : "=t"(res) : "t"(sum));