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Add the NXDN TX preamble.

This commit is contained in:
Jonathan Naylor 2018-01-11 18:29:58 +00:00
parent 99dafe6327
commit d69df42de4
1 changed files with 6 additions and 3 deletions
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9
NXDNTX.cpp
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@ -34,8 +34,8 @@ const q15_t NXDN_LEVELB = 561;
const q15_t NXDN_LEVELC = -561; const q15_t NXDN_LEVELC = -561;
const q15_t NXDN_LEVELD = -1683; const q15_t NXDN_LEVELD = -1683;
const uint8_t NXDN_START_SYNC = 0x77U; const uint8_t NXDN_PREAMBLE[] = {0x57U, 0x75U, 0xFDU};
const uint8_t NXDN_END_SYNC = 0xFFU; const uint8_t NXDN_SYNC = 0x5FU;
CNXDNTX::CNXDNTX() : CNXDNTX::CNXDNTX() :
m_buffer(1500U), m_buffer(1500U),
@ -62,7 +62,10 @@ void CNXDNTX::process()
if (m_poLen == 0U) { if (m_poLen == 0U) {
if (!m_tx) { if (!m_tx) {
for (uint16_t i = 0U; i < m_txDelay; i++) for (uint16_t i = 0U; i < m_txDelay; i++)
m_poBuffer[m_poLen++] = NXDN_START_SYNC; m_poBuffer[m_poLen++] = NXDN_SYNC;
m_poBuffer[m_poLen++] = NXDN_PREAMBLE[0U];
m_poBuffer[m_poLen++] = NXDN_PREAMBLE[1U];
m_poBuffer[m_poLen++] = NXDN_PREAMBLE[2U];
} else { } else {
for (uint8_t i = 0U; i < NXDN_FRAME_LENGTH_BYTES; i++) { for (uint8_t i = 0U; i < NXDN_FRAME_LENGTH_BYTES; i++) {
uint8_t c = m_buffer.get(); uint8_t c = m_buffer.get();