141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
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/*
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Copyright 2018-2019 Bo Zimmerman
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include <FS.h>
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class XModem
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{
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typedef enum
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{
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Crc,
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ChkSum
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} transfer_t;
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private:
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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[128];
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//repeated block flag
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bool repeatedBlock;
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File *xfile = null;
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ZSerial xserial;
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int (*recvChar)(ZSerial *ser, int);
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void (*sendChar)(ZSerial *ser, char);
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bool (*dataHandler)(File *xfile, 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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bool transmitFrames(transfer_t);
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unsigned char generateChkSum(void);
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public:
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static const unsigned char XMO_NACK = 21;
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static const unsigned char XMO_ACK = 6;
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static const unsigned char XMO_SOH = 1;
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static const unsigned char XMO_EOT = 4;
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static const unsigned char XMO_CAN = 0x18;
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static const int receiveDelay=7000;
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static const int rcvRetryLimit = 10;
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XModem(File &f,
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FlowControlType commandFlow,
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int (*recvChar)(ZSerial *ser, int),
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void (*sendChar)(ZSerial *ser, char),
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bool (*dataHandler)(File *xfile, unsigned long, char*, int));
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bool receive();
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bool transmit();
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};
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static int xReceiveSerial(ZSerial *ser, int del)
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{
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unsigned long end=micros() + (del * 1000L);
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while(micros() < end)
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{
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serialOutDeque();
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if(ser->available() > 0)
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{
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int c=ser->read();
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logSerialIn(c);
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return c;
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}
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yield();
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}
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return -1;
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}
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static void xSendSerial(ZSerial *ser, char c)
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{
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ser->write((uint8_t)c);
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ser->flush();
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}
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static bool xUDataHandler(File *xfile, unsigned long number, char *buf, int sz)
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{
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for(int i=0;i<sz;i++)
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xfile->write((uint8_t)buf[i]);
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return true;
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}
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static bool xDDataHandler(File *xfile, unsigned long number, char *buf, int sz)
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{
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for(int i=0;i<sz;i++)
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{
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int c=xfile->read();
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if(c<0)
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{
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if(i==0)
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return false;
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buf[i] = (char)26;
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}
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else
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buf[i] = (char)c;
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}
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return true;
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}
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static boolean xDownload(FlowControlType commandFlow, File &f, String &errors)
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{
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XModem xmo(f,commandFlow, xReceiveSerial, xSendSerial, xDDataHandler);
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bool result = xmo.transmit();
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return result;
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}
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static boolean xUpload(FlowControlType commandFlow, File &f, String &errors)
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{
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XModem xmo(f,commandFlow, xReceiveSerial, xSendSerial, xUDataHandler);
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bool result = xmo.receive();
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return result;
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}
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