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Optimise the min/max calculation.

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This commit is contained in:
Jonathan Naylor
2016-06-14 19:17:40 +01:00
parent 0c635f5132
commit ea68dcb89c
1 changed files with 6 additions and 13 deletions
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YSFRX.cpp
+6 -13
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@@ -110,22 +110,15 @@ void CYSFRX::processNone(q15_t sample)
// Fuzzy matching of the data sync bit sequence // Fuzzy matching of the data sync bit sequence
if (countBits32((m_symbolBuffer & YSF_SYNC_SYMBOLS_MASK) ^ YSF_SYNC_SYMBOLS) <= SYNC_SYMBOL_ERRS) { if (countBits32((m_symbolBuffer & YSF_SYNC_SYMBOLS_MASK) ^ YSF_SYNC_SYMBOLS) <= SYNC_SYMBOL_ERRS) {
uint16_t ptr = m_symbolPtr + 1U;
if (ptr >= YSF_SYNC_LENGTH_SYMBOLS)
ptr = 0U;
q15_t max = -16000; q15_t max = -16000;
q15_t min = 16000; q15_t min = 16000;
for (uint8_t i = 0U; i < YSF_SYNC_LENGTH_SYMBOLS; i++) { for (uint8_t i = 0U; i < YSF_SYNC_LENGTH_SYMBOLS; i++) {
if (m_symbols[ptr] > max) q15_t val = m_symbols[i];
max = m_symbols[ptr]; if (val > max)
if (m_symbols[ptr] < min) max = val;
min = m_symbols[ptr]; if (val < min)
min = val;
ptr++;
if (ptr >= YSF_SYNC_LENGTH_SYMBOLS)
ptr = 0U;
} }
q15_t centre = (max + min) >> 1; q15_t centre = (max + min) >> 1;
@@ -133,7 +126,7 @@ void CYSFRX::processNone(q15_t sample)
q31_t v1 = (max - centre) * SCALING_FACTOR; q31_t v1 = (max - centre) * SCALING_FACTOR;
q15_t threshold = q15_t(v1 >> 15); q15_t threshold = q15_t(v1 >> 15);
ptr = m_symbolPtr + 1U; uint16_t ptr = m_symbolPtr + 1U;
if (ptr >= YSF_SYNC_LENGTH_SYMBOLS) if (ptr >= YSF_SYNC_LENGTH_SYMBOLS)
ptr = 0U; ptr = 0U;