Revision 975af07c
Fixed overflow in current calculation
| toolbox/current.c | ||
|---|---|---|
| 4 | 4 |
#include <math.h> |
| 5 | 5 |
|
| 6 | 6 |
#define CYCLES_PER_SECOND 60 // wall power |
| 7 |
#define SAMPLES_PER_CYCLE 10
|
|
| 8 |
#define N_SAMPLES 20
|
|
| 7 |
#define SAMPLES_PER_CYCLE 16
|
|
| 8 |
#define N_SAMPLES 48
|
|
| 9 | 9 |
|
| 10 | 10 |
unsigned int samples[N_SAMPLES]; |
| 11 | 11 |
int sample_idx; |
| ... | ... | |
| 93 | 93 |
sei(); |
| 94 | 94 |
|
| 95 | 95 |
/* calculate the variance using sum and sum_sq */ |
| 96 |
return (N_SAMPLES*_sum_sq - _sum*_sum) / (N_SAMPLES*(N_SAMPLES-1)); |
|
| 96 |
return (N_SAMPLES*_sum_sq - (unsigned long)_sum*_sum) / |
|
| 97 |
(N_SAMPLES*(N_SAMPLES-1)); |
|
| 97 | 98 |
} |
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