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Add extra idle frames at the start of a DMR DMO transmission.

c4fmdemod
Jonathan Naylor 2017-03-12 18:36:41 +00:00
parent bcbfb66131
commit 3814d4243c
3 changed files with 40 additions and 7 deletions
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40
DMRDMOTX.cpp
View File

@ -41,6 +41,12 @@ const q15_t DMR_LEVELB[] = { 213, 213, 213, 213, 213};
const q15_t DMR_LEVELC[] = {-213, -213, -213, -213, -213};
const q15_t DMR_LEVELD[] = {-640, -640, -640, -640, -640};
// The PR FILL and Data Sync pattern.
const uint8_t IDLE_DATA[] =
{0x53U, 0xC2U, 0x5EU, 0xABU, 0xA8U, 0x67U, 0x1DU, 0xC7U, 0x38U, 0x3BU, 0xD9U,
0x36U, 0x00U, 0x0DU, 0xFFU, 0x57U, 0xD7U, 0x5DU, 0xF5U, 0xD0U, 0x03U, 0xF6U,
0xE4U, 0x65U, 0x17U, 0x1BU, 0x48U, 0xCAU, 0x6DU, 0x4FU, 0xC6U, 0x10U, 0xB4U};
CDMRDMOTX::CDMRDMOTX() :
m_fifo(),
@ -49,7 +55,9 @@ m_modState(),
m_poBuffer(),
m_poLen(0U),
m_poPtr(0U),
m_txDelay(240U) // 200ms
m_txDelay(14U), // 240ms
m_idle(),
m_frameCount(0U)
{
::memset(m_modState, 0x00U, 70U * sizeof(q15_t));
@ -62,14 +70,26 @@ void CDMRDMOTX::process()
{
if (m_poLen == 0U && m_fifo.getData() > 0U) {
if (!m_tx) {
for (uint16_t i = 0U; i < m_txDelay; i++)
m_poBuffer[m_poLen++] = 0x00U;
} else {
m_frameCount = 0U;
for (unsigned int i = 0U; i < 72U; i++)
m_poBuffer[m_poLen++] = 0x00U;
for (unsigned int i = 0U; i < DMR_FRAME_LENGTH_BYTES; i++)
m_poBuffer[i] = m_fifo.get();
m_poBuffer[i] = m_idle[i];
} else {
for (unsigned int i = 0U; i < 72U; i++)
m_poBuffer[m_poLen++] = 0x00U;
if (m_frameCount >= m_txDelay) {
for (unsigned int i = 0U; i < DMR_FRAME_LENGTH_BYTES; i++)
m_poBuffer[i] = m_fifo.get();
} else {
for (unsigned int i = 0U; i < DMR_FRAME_LENGTH_BYTES; i++)
m_poBuffer[i] = m_idle[i];
}
m_frameCount++;
}
m_poPtr = 0U;
@ -146,6 +166,14 @@ uint8_t CDMRDMOTX::getSpace() const
void CDMRDMOTX::setTXDelay(uint8_t delay)
{
m_txDelay = 600U + uint16_t(delay) * 12U; // 500ms + tx delay
m_txDelay = 10U + uint32_t(delay) / 6U;
}
void CDMRDMOTX::setColorCode(uint8_t colorCode)
{
::memcpy(m_idle, IDLE_DATA, DMR_FRAME_LENGTH_BYTES);
CDMRSlotType slotType;
slotType.encode(colorCode, DT_IDLE, m_idle);
}

6
DMRDMOTX.h
View File

@ -37,6 +37,8 @@ public:
uint8_t getSpace() const;
void setColorCode(uint8_t colorCode);
private:
CSerialRB m_fifo;
arm_fir_instance_q15 m_modFilter;
@ -44,7 +46,9 @@ private:
uint8_t m_poBuffer[1200U];
uint16_t m_poLen;
uint16_t m_poPtr;
uint16_t m_txDelay;
uint32_t m_txDelay;
uint8_t m_idle[DMR_FRAME_LENGTH_BYTES];
uint32_t m_frameCount;
void writeByte(uint8_t c);
};

1
SerialPort.cpp
View File

@ -270,6 +270,7 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
dmrDMOTX.setTXDelay(txDelay);
dmrTX.setColorCode(colorCode);
dmrDMOTX.setColorCode(colorCode);
dmrRX.setColorCode(colorCode);
dmrRX.setDelay(dmrDelay);
dmrDMORX.setColorCode(colorCode);