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Add KISS receive.

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This commit is contained in:
Jonathan Naylor 2020-06-21 17:22:27 +01:00
parent 38f59236ae
commit 27c9ad43ec
2 changed files with 86 additions and 18 deletions
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100
AX25Network.cpp
View file

@ -37,11 +37,9 @@ const unsigned char AX25_TFESC = 0xDDU;
CAX25Network::CAX25Network(const std::string& port, unsigned int speed, bool debug) :
m_serial(port, SERIAL_SPEED(speed), false), // XXX
m_txData(NULL),
m_txLength(0U),
m_txOffset(0U),
m_rxData(NULL),
m_rxLength(0U),
m_rxComplete(false),
m_rxLastChar(0U),
m_debug(debug),
m_enabled(false)
{
@ -69,36 +67,103 @@ bool CAX25Network::write(const unsigned char* data, unsigned int length)
{
assert(data != NULL);
m_txLength = 0U;
m_txOffset = 0U;
if (!m_enabled)
return true;
m_txData[m_txLength++] = AX25_FEND;
m_txData[m_txLength++] = AX25_KISS_DATA;
unsigned int txLength = 0U;
m_txData[txLength++] = AX25_FEND;
m_txData[txLength++] = AX25_KISS_DATA;
for (unsigned int i = 0U; i < length; i++) {
unsigned char c = data[i];
switch (c) {
case AX25_FEND:
m_txData[m_txLength++] = AX25_FESC;
m_txData[m_txLength++] = AX25_TFEND;
m_txData[txLength++] = AX25_FESC;
m_txData[txLength++] = AX25_TFEND;
break;
case AX25_FESC:
m_txData[m_txLength++] = AX25_FESC;
m_txData[m_txLength++] = AX25_TFESC;
m_txData[txLength++] = AX25_FESC;
m_txData[txLength++] = AX25_TFESC;
break;
default:
m_txData[m_txLength++] = c;
m_txData[txLength++] = c;
break;
}
}
m_txData[m_txLength++] = AX25_FEND;
m_txData[txLength++] = AX25_FEND;
if (m_debug)
CUtils::dump(1U, "AX25 Network Data Sent", m_txData, m_txLength);
CUtils::dump(1U, "AX25 Network Data Sent", m_txData, txLength);
return m_serial.write(m_txData, m_txLength);
return m_serial.write(m_txData, txLength);
}
unsigned int CAX25Network::read(unsigned char* data, unsigned int length)
{
assert(data != NULL);
bool complete = false;
unsigned char c;
while (m_serial.read(&c, 1U) > 0U) {
if (m_rxLength == 0U && c == AX25_FEND)
m_rxData[m_rxLength++] = c;
else if (m_rxLength > 0U)
m_rxData[m_rxLength++] = c;
if (m_rxLength > 1U && c == AX25_FEND) {
complete = true;
break;
}
}
if (!m_enabled)
return 0U;
if (!complete)
return 0U;
if (m_rxLength == 0U)
return 0U;
if (m_rxData[1U] != AX25_KISS_DATA) {
m_rxLength = 0U;
return 0U;
}
complete = false;
unsigned int dataLen = 0U;
for (unsigned int i = 2U; i < m_rxLength; i++) {
unsigned char c = m_rxData[i];
if (c == AX25_FEND) {
complete = true;
break;
} else if (c == AX25_TFEND && m_rxLastChar == AX25_FESC) {
data[dataLen++] = AX25_FEND;
} else if (c == AX25_TFESC && m_rxLastChar == AX25_FESC) {
data[dataLen++] = AX25_FESC;
} else if (c != AX25_FESC) {
data[dataLen++] = c;
}
m_rxLastChar = c;
}
if (!complete)
return 0U;
if (m_debug)
CUtils::dump(1U, "AX25 Network Data Received", m_rxData, m_rxLength);
m_rxLength = 0U;
m_rxLastChar = 0U;
return dataLen;
}
void CAX25Network::reset()
@ -115,4 +180,9 @@ void CAX25Network::close()
void CAX25Network::enable(bool enabled)
{
m_enabled = enabled;
if (enabled && !m_enabled) {
m_rxLastChar = 0U;
m_rxLength = 0U;
}
}

4
AX25Network.h
View file

@ -44,11 +44,9 @@ public:
private:
CSerialController m_serial;
unsigned char* m_txData;
unsigned int m_txLength;
unsigned int m_txOffset;
unsigned char* m_rxData;
unsigned int m_rxLength;
bool m_rxComplete;
unsigned char m_rxLastChar;
bool m_debug;
bool m_enabled;
};