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Use a common function for finding Tone Key index from received Tone Frequency (#1218)

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* Common function for finding CTCSS tone index from freq
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Mark Thompson 2023-06-30 00:37:43 -05:00 • committed by GitHub
parent 99809c7919
commit cdd524b9f3
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6 changed files with 64 additions and 75 deletions
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41
firmware/application/tone_key.cpp
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@ -73,9 +73,9 @@ const tone_key_t tone_keys = {
{"34 M3", 218.100},
{"35 M4", 225.700},
{"49 9Z", 229.100},
{"36 --", 233.600},
{"37 --", 241.800},
{"38 --", 250.300},
{"36 M5", 233.600},
{"37 M6", 241.800},
{"38 M7", 250.300},
{"50 0Z", 254.100},
{"Axient 28kHz", 28000.0},
{"Senn. 32.768k", 32768.0},
@ -113,6 +113,36 @@ std::string tone_key_string(tone_index index) {
return tone_keys[index].first;
}
std::string tone_key_string_by_value(uint32_t value) {
return tone_key_string(tone_key_index_by_value(value));
}
tone_index tone_key_index_by_value(uint32_t value) {
float diff;
float min_diff{(float)value};
float fvalue{(float)((min_diff + 50.0) / 100.0)};
tone_index min_idx{-1};
tone_index idx;
// Find nearest match
for (idx = 0; idx < (tone_index)tone_keys.size(); idx++) {
diff = abs(fvalue - tone_keys[idx].second);
if (diff < min_diff) {
min_idx = idx;
min_diff = diff;
} else {
// list is sorted in frequency order; if diff is getting larger than we've passed it
break;
}
}
// Arbitrary confidence threshold
if (min_diff < 40.0)
return min_idx;
else
return -1;
}
tone_index tone_key_index_by_string(char* str) {
if (!str)
return -1;
@ -123,9 +153,4 @@ tone_index tone_key_index_by_string(char* str) {
return -1;
}
/* tone_index tone_key_index_by_value( int32_t freq )
{
return -1 ;
} */
} // namespace tonekey