81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
// This code was taken from: https://code.google.com/archive/p/arduino-xmodem
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// (https://code.google.com/archive/p/arduino-xmodem)
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// which was released under GPL V3:
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software Foundation,
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// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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// -----------------------------------------------------------------------------
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typedef enum {
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Crc,
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ChkSum
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} transfer_t;
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class XModem {
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private:
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//delay when receive bytes in frame - 7 secs
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static const int receiveDelay;
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//retry limit when receiving
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static const int rcvRetryLimit;
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//holds readed byte (due to dataAvail())
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int byte;
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//expected block number
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unsigned char blockNo;
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//extended block number, send to dataHandler()
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unsigned long blockNoExt;
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//retry counter for NACK
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int retries;
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//buffer
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char buffer[133];
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//repeated block flag
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bool repeatedBlock;
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TimeoutSerial *serial;
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int (*recvChar)(int);
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void (*sendData)(const char *data, int len);
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bool (*dataHandler)(unsigned long number, char *buffer, int len);
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unsigned short crc16_ccitt(char *buf, int size);
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bool dataAvail(int delay);
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int dataRead(int delay);
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void dataWrite(char symbol);
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bool receiveFrameNo(void);
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bool receiveData(void);
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bool checkCrc(void);
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bool checkChkSum(void);
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bool receiveFrames(transfer_t transfer);
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bool sendNack(void);
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void init(void);
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void sendSerialData(const char *data, int len);
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int recvSerialChar(int);
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bool transmitFrames(transfer_t);
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unsigned char generateChkSum(const char *buffer, int len);
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public:
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static const unsigned char NACK;
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static const unsigned char ACK;
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static const unsigned char SOH;
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static const unsigned char EOT;
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static const unsigned char CAN;
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XModem(TimeoutSerial *serial);
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XModem(TimeoutSerial *serial,bool (*dataHandler)(unsigned long, char*, int));
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bool receive();
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bool transmit();
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};
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