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XModem.h
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XModem.h
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typedef enum {
Crc,
ChkSum
} transfer_t;
class XModem {
private:
//delay when receive bytes in frame - 7 secs
static const int receiveDelay;
//retry limit when receiving
static const int rcvRetryLimit;
//holds readed byte (due to dataAvail())
int byte;
//expected block number
unsigned char blockNo;
//extended block number, send to dataHandler()
unsigned long blockNoExt;
//retry counter for NACK
int retries;
//buffer
char buffer[128];
//repeated block flag
bool repeatedBlock;
int (*recvChar)(int);
void (*sendChar)(char);
bool (*dataHandler)(unsigned long number, char *buffer, int len);
unsigned short crc16_ccitt(char *buf, int size);
bool dataAvail(int delay);
int dataRead(int delay);
void dataWrite(char symbol);
bool receiveFrameNo(void);
bool receiveData(void);
bool checkCrc(void);
bool checkChkSum(void);
bool receiveFrames(transfer_t transfer);
bool sendNack(void);
void init(void);
bool transmitFrames(transfer_t);
unsigned char generateChkSum(void);
public:
static const unsigned char NACK;
static const unsigned char ACK;
static const unsigned char SOH;
static const unsigned char EOT;
static const unsigned char CAN;
XModem(int (*recvChar)(int), void (*sendChar)(char));
XModem(int (*recvChar)(int), void (*sendChar)(char),
bool (*dataHandler)(unsigned long, char*, int));
bool receive();
bool transmit();
};