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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); } while (--loop_cnt > 0);
} }
return sum/(float)count; return sum / (float)count;
} }
static float calculate_standard_deviation(float *values, uint32_t count, float mean) 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; float res;
switch (remainder) { switch (remainder) {
case 0: do { sum += (*values - mean) * (*values - mean); case 0: do {
values++; sum += (*values - mean) * (*values - mean);
/* FALLTHRU */ values++;
case 7: sum += (*values - mean) * (*values - mean); /* FALLTHRU */
values++; case 7: sum += (*values - mean) * (*values - mean);
/* FALLTHRU */ values++;
case 6: sum += (*values - mean) * (*values - mean); /* FALLTHRU */
values++; case 6: sum += (*values - mean) * (*values - mean);
/* FALLTHRU */ values++;
case 5: sum += (*values - mean) * (*values - mean); /* FALLTHRU */
values++; case 5: sum += (*values - mean) * (*values - mean);
/* FALLTHRU */ values++;
case 4: sum += (*values - mean) * (*values - mean); /* FALLTHRU */
values++; case 4: sum += (*values - mean) * (*values - mean);
/* FALLTHRU */ values++;
case 3: sum += (*values - mean) * (*values - mean); /* FALLTHRU */
values++; case 3: sum += (*values - mean) * (*values - mean);
/* FALLTHRU */ values++;
case 2: sum += (*values - mean) * (*values - mean); /* FALLTHRU */
values++; case 2: sum += (*values - mean) * (*values - mean);
/* FALLTHRU */ values++;
case 1: sum += (*values - mean) * (*values - mean); /* FALLTHRU */
values++; case 1: sum += (*values - mean) * (*values - mean);
/* FALLTHRU */ values++;
/* FALLTHRU */
} while (--loop_cnt > 0); } while (--loop_cnt > 0);
} }
sum /= (float)count; 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 * The constraint 't' tells GCC to use a floating point register
*/ */
__asm__ __volatile__("vsqrt.f32 %0, %1" : "=t"(res) : "t"(sum)); __asm__ __volatile__("vsqrt.f32 %0, %1" : "=t"(res) : "t"(sum));