eive-obsw/bsp_hosted/comIF/ArduinoComIF.cpp

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#include "ArduinoComIF.h"
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#include <fsfw/globalfunctions/CRC.h>
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#include <fsfw/globalfunctions/DleEncoder.h>
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#include <fsfw/serviceinterface/ServiceInterfaceStream.h>
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#include "ArduinoCookie.h"
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// This only works on Linux
#ifdef LINUX
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#include <fcntl.h>
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#include <termios.h>
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#include <unistd.h>
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#elif WIN32
#include <strsafe.h>
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#include <windows.h>
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#endif
#include <cstring>
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ArduinoComIF::ArduinoComIF(object_id_t setObjectId, bool promptComIF, const char *serialDevice)
: rxBuffer(MAX_PACKET_SIZE * MAX_NUMBER_OF_SPI_DEVICES * 10, true), SystemObject(setObjectId) {
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#ifdef LINUX
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initialized = false;
serialPort = ::open("/dev/ttyUSB0", O_RDWR);
if (serialPort < 0) {
// configuration error
printf("Error %i from open: %s\n", errno, strerror(errno));
return;
}
struct termios tty;
memset(&tty, 0, sizeof tty);
// Read in existing settings, and handle any error
if (tcgetattr(serialPort, &tty) != 0) {
printf("Error %i from tcgetattr: %s\n", errno, strerror(errno));
return;
}
tty.c_cflag &= ~PARENB; // Clear parity bit, disabling parity
tty.c_cflag &= ~CSTOPB; // Clear stop field, only one stop bit used in communication
tty.c_cflag |= CS8; // 8 bits per byte
tty.c_cflag &= ~CRTSCTS; // Disable RTS/CTS hardware flow control
tty.c_lflag &= ~ICANON; // Disable Canonical Mode
tty.c_oflag &= ~OPOST; // Prevent special interpretation of output bytes (e.g. newline chars)
tty.c_oflag &= ~ONLCR; // Prevent conversion of newline to carriage return/line feed
tty.c_cc[VTIME] = 0; // Non Blocking
tty.c_cc[VMIN] = 0;
cfsetispeed(&tty, B9600); // Baudrate
if (tcsetattr(serialPort, TCSANOW, &tty) != 0) {
// printf("Error %i from tcsetattr: %s\n", errno, strerror(errno));
return;
}
initialized = true;
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#elif WIN32
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DCB serialParams = {0};
// we need to ask the COM port from the user.
if (promptComIF) {
sif::info << "Please enter the COM port (c to cancel): " << std::flush;
std::string comPort;
while (hCom == INVALID_HANDLE_VALUE) {
std::getline(std::cin, comPort);
if (comPort[0] == 'c') {
break;
}
const TCHAR *pcCommPort = comPort.c_str();
hCom = CreateFileA(pcCommPort, // port name
GENERIC_READ | GENERIC_WRITE, // Read/Write
0, // No Sharing
NULL, // No Security
OPEN_EXISTING, // Open existing port only
0, // Non Overlapped I/O
NULL); // Null for Comm Devices
if (hCom == INVALID_HANDLE_VALUE) {
if (GetLastError() == 2) {
sif::error << "COM Port does not found!" << std::endl;
} else {
TCHAR err[128];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), err, sizeof(err), NULL);
// Handle the error.
sif::info << "CreateFileA Error code: " << GetLastError() << std::endl;
sif::error << err << std::flush;
}
sif::info << "Please enter a valid COM port: " << std::flush;
}
}
}
serialParams.DCBlength = sizeof(serialParams);
if (baudRate == 9600) {
serialParams.BaudRate = CBR_9600;
}
if (baudRate == 115200) {
serialParams.BaudRate = CBR_115200;
} else {
serialParams.BaudRate = baudRate;
}
serialParams.ByteSize = 8;
serialParams.Parity = NOPARITY;
serialParams.StopBits = ONESTOPBIT;
SetCommState(hCom, &serialParams);
COMMTIMEOUTS timeout = {0};
// This will set the read operation to be blocking until data is received
// and then read continuously until there is a gap of one millisecond.
timeout.ReadIntervalTimeout = 1;
timeout.ReadTotalTimeoutConstant = 0;
timeout.ReadTotalTimeoutMultiplier = 0;
timeout.WriteTotalTimeoutConstant = 0;
timeout.WriteTotalTimeoutMultiplier = 0;
SetCommTimeouts(hCom, &timeout);
// Serial port should now be read for operations.
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#endif
}
ArduinoComIF::~ArduinoComIF() {
#ifdef LINUX
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::close(serialPort);
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#elif WIN32
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CloseHandle(hCom);
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#endif
}
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ReturnValue_t ArduinoComIF::initializeInterface(CookieIF *cookie) { return returnvalue::OK; }
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ReturnValue_t ArduinoComIF::sendMessage(CookieIF *cookie, const uint8_t *data, size_t len) {
ArduinoCookie *arduinoCookie = dynamic_cast<ArduinoCookie *>(cookie);
if (arduinoCookie == nullptr) {
return INVALID_COOKIE_TYPE;
}
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return sendMessage(arduinoCookie->command, arduinoCookie->address, data, len);
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}
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ReturnValue_t ArduinoComIF::getSendSuccess(CookieIF *cookie) { return returnvalue::OK; }
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ReturnValue_t ArduinoComIF::requestReceiveMessage(CookieIF *cookie, size_t requestLen) {
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return returnvalue::OK;
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}
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ReturnValue_t ArduinoComIF::readReceivedMessage(CookieIF *cookie, uint8_t **buffer, size_t *size) {
handleSerialPortRx();
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ArduinoCookie *arduinoCookie = dynamic_cast<ArduinoCookie *>(cookie);
if (arduinoCookie == nullptr) {
return INVALID_COOKIE_TYPE;
}
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*buffer = arduinoCookie->replyBuffer.data();
*size = arduinoCookie->receivedDataLen;
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return returnvalue::OK;
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}
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ReturnValue_t ArduinoComIF::sendMessage(uint8_t command, uint8_t address, const uint8_t *data,
size_t dataLen) {
if (dataLen > UINT16_MAX) {
return TOO_MUCH_DATA;
}
// being conservative here
uint8_t sendBuffer[(dataLen + 6) * 2 + 2];
sendBuffer[0] = DleEncoder::STX_CHAR;
uint8_t *currentPosition = sendBuffer + 1;
size_t remainingLen = sizeof(sendBuffer) - 1;
size_t encodedLen = 0;
ReturnValue_t result =
DleEncoder::encode(&command, 1, currentPosition, remainingLen, &encodedLen, false);
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if (result != returnvalue::OK) {
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return result;
}
currentPosition += encodedLen;
remainingLen -= encodedLen; // DleEncoder will never return encodedLen > remainingLen
result = DleEncoder::encode(&address, 1, currentPosition, remainingLen, &encodedLen, false);
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if (result != returnvalue::OK) {
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return result;
}
currentPosition += encodedLen;
remainingLen -= encodedLen; // DleEncoder will never return encodedLen > remainingLen
uint8_t temporaryBuffer[2];
// note to Lukas: yes we _could_ use Serialize here, but for 16 bit it is a bit too much...
temporaryBuffer[0] = dataLen >> 8; // we checked dataLen above
temporaryBuffer[1] = dataLen;
result =
DleEncoder::encode(temporaryBuffer, 2, currentPosition, remainingLen, &encodedLen, false);
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if (result != returnvalue::OK) {
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return result;
}
currentPosition += encodedLen;
remainingLen -= encodedLen; // DleEncoder will never return encodedLen > remainingLen
// encoding the actual data
result = DleEncoder::encode(data, dataLen, currentPosition, remainingLen, &encodedLen, false);
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if (result != returnvalue::OK) {
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return result;
}
currentPosition += encodedLen;
remainingLen -= encodedLen; // DleEncoder will never return encodedLen > remainingLen
uint16_t crc = CRC::crc16ccitt(&command, 1);
crc = CRC::crc16ccitt(&address, 1, crc);
// fortunately the length is still there
crc = CRC::crc16ccitt(temporaryBuffer, 2, crc);
crc = CRC::crc16ccitt(data, dataLen, crc);
temporaryBuffer[0] = crc >> 8;
temporaryBuffer[1] = crc;
result =
DleEncoder::encode(temporaryBuffer, 2, currentPosition, remainingLen, &encodedLen, false);
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if (result != returnvalue::OK) {
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return result;
}
currentPosition += encodedLen;
remainingLen -= encodedLen; // DleEncoder will never return encodedLen > remainingLen
if (remainingLen > 0) {
*currentPosition = DleEncoder::ETX_CHAR;
}
remainingLen -= 1;
encodedLen = sizeof(sendBuffer) - remainingLen;
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#ifdef LINUX
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ssize_t writtenlen = ::write(serialPort, sendBuffer, encodedLen);
if (writtenlen < 0) {
// we could try to find out what happened...
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return returnvalue::FAILED;
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}
if (writtenlen != encodedLen) {
// the OS failed us, we do not try to block until everything is written, as
// we can not block the whole system here
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return returnvalue::FAILED;
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}
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return returnvalue::OK;
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#elif WIN32
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return returnvalue::OK;
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#endif
}
void ArduinoComIF::handleSerialPortRx() {
#ifdef LINUX
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uint32_t availableSpace = rxBuffer.availableWriteSpace();
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uint8_t dataFromSerial[availableSpace];
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ssize_t bytesRead = read(serialPort, dataFromSerial, sizeof(dataFromSerial));
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if (bytesRead < 0) {
return;
}
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rxBuffer.writeData(dataFromSerial, bytesRead);
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uint8_t dataReceivedSoFar[rxBuffer.getMaxSize()];
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uint32_t dataLenReceivedSoFar = 0;
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rxBuffer.readData(dataReceivedSoFar, sizeof(dataReceivedSoFar), true, &dataLenReceivedSoFar);
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// look for STX
size_t firstSTXinRawData = 0;
while ((firstSTXinRawData < dataLenReceivedSoFar) &&
(dataReceivedSoFar[firstSTXinRawData] != DleEncoder::STX_CHAR)) {
firstSTXinRawData++;
}
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if (dataReceivedSoFar[firstSTXinRawData] != DleEncoder::STX_CHAR) {
// there is no STX in our data, throw it away...
rxBuffer.deleteData(dataLenReceivedSoFar);
return;
}
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uint8_t packet[MAX_PACKET_SIZE];
size_t packetLen = 0;
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size_t readSize = 0;
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ReturnValue_t result = DleEncoder::decode(dataReceivedSoFar + firstSTXinRawData,
dataLenReceivedSoFar - firstSTXinRawData, &readSize,
packet, sizeof(packet), &packetLen);
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size_t toDelete = firstSTXinRawData;
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if (result == returnvalue::OK) {
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handlePacket(packet, packetLen);
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// after handling the packet, we can delete it from the raw stream,
// it has been copied to packet
toDelete += readSize;
}
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// remove Data which was processed
rxBuffer.deleteData(toDelete);
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#elif WIN32
#endif
}
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void ArduinoComIF::setBaudrate(uint32_t baudRate) { this->baudRate = baudRate; }
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void ArduinoComIF::handlePacket(uint8_t *packet, size_t packetLen) {
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uint16_t crc = CRC::crc16ccitt(packet, packetLen);
if (crc != 0) {
// CRC error
return;
}
uint8_t command = packet[0];
uint8_t address = packet[1];
uint16_t size = (packet[2] << 8) + packet[3];
if (size != packetLen - 6) {
// Invalid Length
return;
}
switch (command) {
case ArduinoCookie::SPI: {
// ArduinoCookie **itsComplicated;
auto findIter = spiMap.find(address);
if (findIter == spiMap.end()) {
// we do no know this address
return;
}
ArduinoCookie &cookie = findIter->second;
if (packetLen > cookie.maxReplySize + 6) {
packetLen = cookie.maxReplySize + 6;
}
std::memcpy(cookie.replyBuffer.data(), packet + 4, packetLen - 6);
cookie.receivedDataLen = packetLen - 6;
} break;
default:
return;
}
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}