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Utilizar memoria flash para tabela de CRC #38

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Utilizar memoria flash para tabela de CRC #38

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6d305e8
Utilizar memoria flash para tabela de CRC
jPerotto Jun 28, 2018
3c3680f
Update ModbusSerial.h
jPerotto Jun 28, 2018
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29 changes: 23 additions & 6 deletions libraries/ModbusSerial/ModbusSerial.h
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
/*
ModbusSerial.h - Header for ModbusSerial Library
Copyright (C) 2014 Andr� Sarmento Barbosa
Copyright (C) 2014 André Sarmento Barbosa
*/
#include <Arduino.h>
#include <Modbus.h>
Expand All @@ -9,11 +9,17 @@
#define MODBUSSERIAL_H

//#define USE_SOFTWARE_SERIAL
#define USE_FLASH_PROGMEM


#ifdef USE_SOFTWARE_SERIAL
#include <SoftwareSerial.h>
#endif

#ifdef USE_FLASH_PROGMEM
#include <avr/pgmspace.h>
#endif

class ModbusSerial : public Modbus {
private:
Stream* _port;
Expand Down Expand Up @@ -41,8 +47,14 @@ class ModbusSerial : public Modbus {
bool send(byte* frame);
};

/* Table of CRC values for high�order byte */
const byte _auchCRCHi[] = {
/* Table of CRC values for high–order byte */
#ifndef USE_FLASH_PROGMEM
const byte _auchCRCHi[] = {
#endif

#ifdef USE_FLASH_PROGMEM
const byte _auchCRCHi[] PROGMEM = {
#endif
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01,
Expand All @@ -62,8 +74,14 @@ const byte _auchCRCHi[] = {
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
0x40};

/* Table of CRC values for low�order byte */
const byte _auchCRCLo[] = {
/* Table of CRC values for low–order byte */
#ifndef USE_FLASH_PROGMEM
const byte _auchCRCLo[] = {
#endif

#ifdef USE_FLASH_PROGMEM
const byte _auchCRCLo[] PROGMEM = {
#endif
0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4,
0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD,
Expand All @@ -83,4 +101,3 @@ const byte _auchCRCLo[] = {
0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80,
0x40};

#endif //MODBUSSERIAL_H