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Gets messages form the pc and translates it to I2C and back.
Dependencies: DevInterfaces I2Cinterfaces MCP4725 mbed
Diff: Translator.h
- Revision:
- 2:2330ad8b1baa
- Parent:
- 0:b40341017545
--- a/Translator.h Wed May 18 11:35:45 2016 +0000 +++ b/Translator.h Wed Jun 15 10:53:32 2016 +0000 @@ -1,17 +1,51 @@ #pragma once +#define MAX(a,b) (((a) > (b)) ? (a) : (b)) + #include <string> #include "mbed.h" -#include "Utility.h" // Implements the Data-Link layer, translating a raw message to MessageInfo and back class Translator { + public: + enum EErrorCode { + SUCCES, + INCOMPLETE, + INVALID + }; + + // Rules over how the command is structured, indexes are per byte + struct Rules { + static const int StartCharIndex = 0; // Location of starting char + static const int CharsToReadIndex = 1; // Location of chars to read value + static const int AddressIndex = 2; // Location of pin address + static const int CommandIndex = 3; // Location of command type char + static const int DataIndex = 4; // Location of data start + + static const char StartChar = '!'; // Starting character + static const char ReadChar = 'r'; // Character to indicate read command + static const char WriteChar = 'w'; // Character to indicate write command + static const char OtherChar = 'o'; // Character to indicate other command + static const char ErrorChar = 'e'; // Character to indicate an error + + static const int PrefixSize = CharsToReadIndex + 1; // Number of chars in the prefix + static const int ReadDataSize = 5; // Number of chars used in read data + static const int WriteDataSize = 3; // Number of chars used in write data + static const int MaxDataSize = MAX(ReadDataSize, WriteDataSize); // Maximum size of data array + static const int EmptyDataCmdSize = DataIndex; // Number of chars in command if no data + static const int ReadCmdSize = EmptyDataCmdSize + ReadDataSize; // Size of a read command + static const int WriteCmdSize = EmptyDataCmdSize + WriteDataSize; // Size of a write command + static const int ErrorCmdSize = EmptyDataCmdSize; // Size of an error command + + static const int MaxCmdSize = MAX(ReadCmdSize, WriteCmdSize); // Maximum total command size + }; + // Contains easy retreivable message info struct MessageInfo { - enum ECommandType { NONE, READ, WRITE, OPTION, ERROR } CommandType; - int Channel; //Not used - int DacValue; + enum ECommandType { NONE, READ, WRITE, ERROR } CommandType; + int Address; + char Data[Rules::MaxCmdSize]; MessageInfo(); @@ -19,36 +53,10 @@ bool IsNone(); bool IsRead(); bool IsWrite(); - bool IsOption(); - }; - -private: - // Contains the raw message in bytes - const int8_t* _rawMessage; - // Size of the raw message - int _size; - // Message info, is populated in SetRawMessage - MessageInfo _message; - -public: - // Contains rules about how the raw message is formatted - struct Rules { - static int StartCharIndex; - static int8_t StartChar; - static int CharsToReadIndex; - static int CharsToReadOffset; - static int rwoIndex; - static int8_t ReadChar; - static int8_t WriteChar; - static int8_t OptionChar; - static int8_t ErrorChar; - //static int ChannelIndex; - static int DataIndex; - static int DataLength; + bool IsError(); - static int ReadCmdSize; - static int WriteCmdSize; - static int ErrorCmdSize; + // Resets all values to default + void Reset(); }; private: @@ -62,19 +70,14 @@ // cmdSize geeft de grootte van de pointer ZONDER het null karakter zodat het zowel veilig // kan gebruikt worden in printf en andere functies die geen null karakter vereisen (en waarbij // dus het NULL karakter niet zal ingelezen worden> - // Translate MessageInfo to raw int8_t* (NULL terminated) - static bool Translate(MessageInfo info, int8_t** const cmd, int* const cmdSize); + // Translate MessageInfo to raw char* (NULL terminated) + static bool Translate(MessageInfo info, char cmd[Rules::MaxCmdSize], int* const cmdSize); // <Hier bijvoorbeeld is het NULL karakter niet vereist omdat de grootte wordt opgevraagt - // Indien de int8_t* van vorige functie hier terug wordt in gezet volstaat het om ook zijn + // Indien de char* van vorige functie hier terug wordt in gezet volstaat het om ook zijn // cmdSize te gebruiken: het NULL karakter valt hier buiten en wordt daarom dus niet gelezen // Dit zal ik toevoegen aan de ondervonden problemen.> - // Translate raw int8_t* message to MessageInfo - static bool Translate(const int8_t* const cmd, int cmdSize, MessageInfo* const info); + // Translate raw char* message to MessageInfo + // Returns 0 if succesful, -1 if message too short, 1 for faulty/unrecoverable message + static EErrorCode Translate(const char* const cmd, int cmdSize, MessageInfo* const info); - -private: - void SetMessageInfo(); - void ResetMessageInfo(); - void InvalidateMessage(); - }; \ No newline at end of file