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TPUART full duplex handling

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This commit is contained in:
Mike Pieper 2021-12-18 09:11:45 +01:00
parent fb74931bec
commit 910ccae31b
2 changed files with 219 additions and 161 deletions
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375
src/knx/tpuart_data_link_layer.cpp
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@ -11,6 +11,9 @@
#include <stdio.h>
#include <string.h>
// Activate trace output
//#define DBG_TRACE
// NCN5120
//#define NCN5120
@ -75,14 +78,22 @@
#define U_STOP_MODE_IND 0x2B
#define U_SYSTEM_STAT_IND 0x4B
//loop states
#define IDLE 0
#define RX_FIRST_BYTE 1
#define RX_L_DATA 2
#define RX_WAIT_DATA_CON 3
#define TX_FRAME 4
//tx states
enum {
TX_IDLE,
TX_FRAME,
TX_WAIT_ECHO,
TX_WAIT_CONN
};
#define BYTE_TIMEOUT 10 //milli seconds
//rx states
enum {
RX_WAIT_START,
RX_L_DATA,
RX_WAIT_EOP
};
#define EOP_TIMEOUT 2 //milli seconds; end of layer-2 packet gap
#define CONFIRM_TIMEOUT 500 //milli seconds
#define RESET_TIMEOUT 100 //milli seconds
@ -107,134 +118,136 @@ void TpUartDataLinkLayer::loop()
if (!_enabled)
return;
switch (_loopState)
bool isEchoComplete = false; // Flag that a complete echo is received
bool dataConnMsg = 0; // The DATA_CONN message just seen or 0
bool isEOP = (millis() - _lastByteRxTime > EOP_TIMEOUT); // Flag that an EOP gap is seen
switch (_rxState)
{
case IDLE:
case RX_WAIT_START:
if (_platform.uartAvailable())
{
_loopState = RX_FIRST_BYTE;
}
else
{
if (!_waitConfirm && !isTxQueueEmpty())
{
loadNextTxFrame();
_loopState = TX_FRAME;
}
}
break;
case TX_FRAME:
if (sendSingleFrameByte() == false)
{
_waitConfirm = true;
_waitConfirmStartTime = millis();
_loopState = IDLE;
}
break;
case RX_FIRST_BYTE:
rxByte = _platform.readUart();
_lastByteRxTime = millis();
_RxByteCnt = 0;
_xorSum = 0;
if ((rxByte & L_DATA_MASK) == L_DATA_STANDARD_IND)
{
buffer[_RxByteCnt++] = rxByte;
_xorSum ^= rxByte;
_RxByteCnt++; //convert to L_DATA_EXTENDED
_convert = true;
_loopState = RX_L_DATA;
break;
}
else if ((rxByte & L_DATA_MASK) == L_DATA_EXTENDED_IND)
{
buffer[_RxByteCnt++] = rxByte;
_xorSum ^= rxByte;
_convert = false;
_loopState = RX_L_DATA;
break;
}
else if ((rxByte & L_DATA_CON_MASK) == L_DATA_CON)
{
println("got unexpected L_DATA_CON");
}
else if (rxByte == L_POLL_DATA_IND)
{
// not sure if this can happen
println("got L_POLL_DATA_IND");
}
else if ((rxByte & L_ACKN_MASK) == L_ACKN_IND)
{
// this can only happen in bus monitor mode
println("got L_ACKN_IND");
}
else if (rxByte == U_RESET_IND)
{
println("got U_RESET_IND");
}
else if ((rxByte & U_STATE_IND) == U_STATE_IND)
{
print("got U_STATE_IND: 0x");
rxByte = _platform.readUart();
#ifdef DBG_TRACE
print(rxByte, HEX);
println();
}
else if ((rxByte & U_FRAME_STATE_MASK) == U_FRAME_STATE_IND)
{
print("got U_FRAME_STATE_IND: 0x");
print(rxByte, HEX);
println();
}
else if ((rxByte & U_CONFIGURE_MASK) == U_CONFIGURE_IND)
{
print("got U_CONFIGURE_IND: 0x");
print(rxByte, HEX);
println();
}
else if (rxByte == U_FRAME_END_IND)
{
println("got U_FRAME_END_IND");
}
else if (rxByte == U_STOP_MODE_IND)
{
println("got U_STOP_MODE_IND");
}
else if (rxByte == U_SYSTEM_STAT_IND)
{
print("got U_SYSTEM_STAT_IND: 0x");
while (true)
{
int tmp = _platform.readUart();
if (tmp < 0)
continue;
#endif
_lastByteRxTime = millis();
print(tmp, HEX);
// Check for layer-2 packets
_RxByteCnt = 0;
_xorSum = 0;
if ((rxByte & L_DATA_MASK) == L_DATA_STANDARD_IND)
{
buffer[_RxByteCnt++] = rxByte;
_xorSum ^= rxByte;
_RxByteCnt++; //convert to L_DATA_EXTENDED
_convert = true;
_rxState = RX_L_DATA;
#ifdef DBG_TRACE
println("RLS");
#endif
break;
}
println();
else if ((rxByte & L_DATA_MASK) == L_DATA_EXTENDED_IND)
{
buffer[_RxByteCnt++] = rxByte;
_xorSum ^= rxByte;
_convert = false;
_rxState = RX_L_DATA;
#ifdef DBG_TRACE
println("RLX");
#endif
break;
}
// Handle all single byte packets here
else if ((rxByte & L_DATA_CON_MASK) == L_DATA_CON)
{
dataConnMsg = rxByte;
}
else if (rxByte == L_POLL_DATA_IND)
{
// not sure if this can happen
println("got L_POLL_DATA_IND");
}
else if ((rxByte & L_ACKN_MASK) == L_ACKN_IND)
{
// this can only happen in bus monitor mode
println("got L_ACKN_IND");
}
else if (rxByte == U_RESET_IND)
{
println("got U_RESET_IND");
}
else if ((rxByte & U_STATE_IND) == U_STATE_IND)
{
print("got U_STATE_IND:");
if (rxByte & 0x80) print (" SC");
if (rxByte & 0x40) print (" RE");
if (rxByte & 0x20) print (" TE");
if (rxByte & 0x10) print (" PE");
if (rxByte & 0x08) print (" TW");
println();
}
else if ((rxByte & U_FRAME_STATE_MASK) == U_FRAME_STATE_IND)
{
print("got U_FRAME_STATE_IND: 0x");
print(rxByte, HEX);
println();
}
else if ((rxByte & U_CONFIGURE_MASK) == U_CONFIGURE_IND)
{
print("got U_CONFIGURE_IND: 0x");
print(rxByte, HEX);
println();
}
else if (rxByte == U_FRAME_END_IND)
{
println("got U_FRAME_END_IND");
}
else if (rxByte == U_STOP_MODE_IND)
{
println("got U_STOP_MODE_IND");
}
else if (rxByte == U_SYSTEM_STAT_IND)
{
print("got U_SYSTEM_STAT_IND: 0x");
while (true)
{
int tmp = _platform.readUart();
if (tmp < 0)
continue;
print(tmp, HEX);
break;
}
println();
}
else
{
print("got UNEXPECTED: 0x");
print(rxByte, HEX);
println();
}
}
else
{
print("got UNEXPECTED: 0x");
print(rxByte, HEX);
println();
}
_loopState = IDLE;
break;
case RX_L_DATA:
if (millis() - _lastByteRxTime > BYTE_TIMEOUT)
if (isEOP)
{
_RxByteCnt = 0;
_loopState = IDLE;
println("Timeout during RX_L_DATA");
_rxState = RX_WAIT_START;
print("EOP inside RX_L_DATA");
printHex(" => ", buffer, _RxByteCnt);
break;
}
if (!_platform.uartAvailable())
break;
_lastByteRxTime = millis();
rxByte = _platform.readUart();
#ifdef DBG_TRACE
print(rxByte, HEX);
#endif
if (_RxByteCnt == MAX_KNX_TELEGRAM_SIZE)
{
_loopState = IDLE;
_rxState = RX_WAIT_EOP;
println("invalid telegram size");
}
else
@ -280,6 +293,7 @@ void TpUartDataLinkLayer::loop()
c |= 0x01;
}
// Hint: We can send directly here, this doesn't disturb other transmissions
_platform.writeUart(c);
}
}
@ -299,18 +313,21 @@ void TpUartDataLinkLayer::loop()
}
if (_isEcho)
{
_loopState = RX_WAIT_DATA_CON;
isEchoComplete = true;
}
else
{
frameBytesReceived(_receiveBuffer, _RxByteCnt + 2);
_loopState = IDLE;
}
_rxState = RX_WAIT_START;
#ifdef DBG_TRACE
println("RX_WAIT_START");
#endif
}
else
{
println("frame with invalid crc ignored");
_loopState = IDLE;
_rxState = RX_WAIT_EOP;
}
}
else
@ -318,54 +335,93 @@ void TpUartDataLinkLayer::loop()
_xorSum ^= rxByte;
}
break;
case RX_WAIT_DATA_CON:
case RX_WAIT_EOP:
if (isEOP)
{
_RxByteCnt = 0;
_rxState = RX_WAIT_START;
#ifdef DBG_TRACE
println("RX_WAIT_START");
#endif
break;
}
if (!_platform.uartAvailable())
break;
rxByte = _platform.readUart();
_lastByteRxTime = millis();
if ((rxByte & L_DATA_CON_MASK) == L_DATA_CON)
{
//println("L_DATA_CON received");
dataConBytesReceived(_receiveBuffer, _RxByteCnt + 2, ((rxByte & SUCCESS) > 0));
_waitConfirm = false;
delete[] _sendBuffer;
_sendBuffer = 0;
_sendBufferLength = 0;
_loopState = IDLE;
}
else
{
//should not happen
println("expected L_DATA_CON not received");
dataConBytesReceived(_receiveBuffer, _RxByteCnt + 2, false);
_waitConfirm = false;
delete[] _sendBuffer;
_sendBuffer = 0;
_sendBufferLength = 0;
_loopState = IDLE;
}
rxByte = _platform.readUart();
#ifdef DBG_TRACE
print(rxByte, HEX);
#endif
break;
default:
break;
}
if (_waitConfirm)
// Check for spurios DATA_CONN message
if (dataConnMsg && _txState != TX_WAIT_CONN && _txState != TX_WAIT_ECHO) {
println("got unexpected L_DATA_CON");
}
switch (_txState)
{
if (millis() - _waitConfirmStartTime > CONFIRM_TIMEOUT)
{
println("L_DATA_CON not received within expected time");
uint8_t cemiBuffer[MAX_KNX_TELEGRAM_SIZE];
cemiBuffer[0] = 0x29;
cemiBuffer[1] = 0;
memcpy((cemiBuffer + 2), _sendBuffer, _sendBufferLength);
dataConBytesReceived(cemiBuffer, _sendBufferLength + 2, false);
_waitConfirm = false;
delete[] _sendBuffer;
_sendBuffer = 0;
_sendBufferLength = 0;
if (_loopState == RX_WAIT_DATA_CON)
_loopState = IDLE;
}
case TX_IDLE:
if (!isTxQueueEmpty())
{
loadNextTxFrame();
_txState = TX_FRAME;
#ifdef DBG_TRACE
println("TX_FRAME");
#endif
}
break;
case TX_FRAME:
if (sendSingleFrameByte() == false)
{
_waitConfirmStartTime = millis();
_txState = TX_WAIT_ECHO;
#ifdef DBG_TRACE
println("TX_WAIT_ECHO");
#endif
}
break;
case TX_WAIT_ECHO:
case TX_WAIT_CONN:
if (isEchoComplete)
{
_txState = TX_WAIT_CONN;
#ifdef DBG_TRACE
println("TX_WAIT_CONN");
#endif
}
else if (dataConnMsg)
{
bool waitEcho = (_txState == TX_WAIT_ECHO);
if (waitEcho) {
println("L_DATA_CON without echo");
}
dataConBytesReceived(_receiveBuffer, _RxByteCnt + 2, !waitEcho && ((dataConnMsg & SUCCESS) > 0));
delete[] _sendBuffer;
_sendBuffer = 0;
_sendBufferLength = 0;
_txState = TX_IDLE;
}
else if (millis() - _waitConfirmStartTime > CONFIRM_TIMEOUT)
{
println("L_DATA_CON not received within expected time");
uint8_t cemiBuffer[MAX_KNX_TELEGRAM_SIZE];
cemiBuffer[0] = 0x29;
cemiBuffer[1] = 0;
memcpy((cemiBuffer + 2), _sendBuffer, _sendBufferLength);
dataConBytesReceived(cemiBuffer, _sendBufferLength + 2, false);
delete[] _sendBuffer;
_sendBuffer = 0;
_sendBufferLength = 0;
_txState = TX_IDLE;
#ifdef DBG_TRACE
println("TX_IDLE");
#endif
}
break;
}
}
@ -496,6 +552,9 @@ bool TpUartDataLinkLayer::sendSingleFrameByte()
cmd[0] = U_L_DATA_END_REQ | _TxByteCnt;
cmd[1] = _sendBuffer[_TxByteCnt];
#ifdef DBG_TRACE
print(cmd[1], HEX);
#endif
_platform.writeUart(cmd, 2);
_TxByteCnt++;

5
src/knx/tpuart_data_link_layer.h
View File

@ -31,16 +31,15 @@ class TpUartDataLinkLayer : public DataLinkLayer
private:
bool _enabled = false;
bool _waitConfirm = false;
uint8_t* _sendBuffer = 0;
uint16_t _sendBufferLength = 0;
uint8_t _receiveBuffer[MAX_KNX_TELEGRAM_SIZE];
uint8_t _loopState = 0;
uint8_t _txState = 0;
uint8_t _rxState = 0;
uint16_t _RxByteCnt = 0;
uint16_t _TxByteCnt = 0;
uint8_t _oldIdx = 0;
bool _isEcho = false;
bool _isAddressed = false;
bool _convert = false;
uint8_t _xorSum = 0;
uint32_t _lastByteRxTime;