core/math/series.c
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /** | ||
| 2 | * @file series.c | ||
| 3 | * @brief Reducing a run of samples to the few numbers a chart draws from. | ||
| 4 | * | ||
| 5 | * @ingroup lib_core | ||
| 6 | */ | ||
| 7 | #include "math/series.h" | ||
| 8 | |||
| 9 | 4 | int series_range(const uint8_t *samples, int count, uint8_t no_sample, | |
| 10 | int *lo, int *hi, int *last) | ||
| 11 | { | ||
| 12 | 4 | int lo_val = 0; | |
| 13 | 4 | int hi_val = 0; | |
| 14 | 4 | int last_val = 0; | |
| 15 | 4 | int valid = 0; | |
| 16 | |||
| 17 |
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19 | for (int i = 0; i < count; i++) |
| 18 | { | ||
| 19 | 15 | int value = samples[i]; | |
| 20 |
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15 | if (value == no_sample) |
| 21 | { | ||
| 22 | 8 | continue; | |
| 23 | } | ||
| 24 | |||
| 25 |
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7 | if (valid == 0 || value < lo_val) |
| 26 | { | ||
| 27 | 4 | lo_val = value; | |
| 28 | } | ||
| 29 |
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7 | if (valid == 0 || value > hi_val) |
| 30 | { | ||
| 31 | 6 | hi_val = value; | |
| 32 | } | ||
| 33 | 7 | last_val = value; // slots run oldest to newest, so the last real one is the most recent | |
| 34 | 7 | valid++; | |
| 35 | } | ||
| 36 | |||
| 37 |
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4 | if (valid > 0) |
| 38 | { | ||
| 39 | 3 | *lo = lo_val; | |
| 40 | 3 | *hi = hi_val; | |
| 41 | 3 | *last = last_val; | |
| 42 | } | ||
| 43 | 4 | return valid; | |
| 44 | } | ||
| 45 | |||
| 46 | 2 | int series_max_u16(const uint16_t *values, int count) | |
| 47 | { | ||
| 48 | 2 | int hi = 0; | |
| 49 |
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6 | for (int i = 0; i < count; i++) |
| 50 | { | ||
| 51 |
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4 | if (values[i] > hi) |
| 52 | { | ||
| 53 | 2 | hi = values[i]; | |
| 54 | } | ||
| 55 | } | ||
| 56 | 2 | return hi; | |
| 57 | } | ||
| 58 |