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72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
#pragma once
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//
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// FILE: RS485.h
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// AUTHOR: Rob Tillaart
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// DATE: 30-okt-2017
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// VERSION: 0.5.0
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// PURPOSE: Arduino library for RS485 modules
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// URL: https://github.com/RobTillaart/RS485
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#include "Arduino.h"
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#include "ASCII_CONTROL.h"
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#define RS485_LIB_VERSION (F("0.5.0"))
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class RS485 : public Stream
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{
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public:
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RS485(Stream * stream, uint8_t sendPin, uint8_t deviceID = 0);
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uint8_t getDeviceID();
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// Stream interface
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int available();
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int read();
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int peek();
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void flush();
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// Write
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size_t write(uint8_t c);
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size_t write(char * array, uint8_t length); // wrapper
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size_t write(uint8_t * array, uint8_t length);
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// Mode functions
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inline void setTXmode() { digitalWrite(_sendPin, HIGH); };
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inline void setRXmode() { digitalWrite(_sendPin, LOW); };
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uint8_t getMode() { return digitalRead(_sendPin) == HIGH; };
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// EXPERIMENTAL
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// - in a derived class?
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// - use at own risk
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// send ASCII encoded messages from one master to multiple clients.
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// msg[] = 32..127
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// len = 1.. 48 (internal receive buffer is 50)
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size_t send(uint8_t receiverID, uint8_t msg[], uint8_t len);
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bool receive(uint8_t &senderID, uint8_t msg[], uint8_t &len);
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// EXPERIMENTAL
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size_t send(uint8_t receiverID, char msg[], uint8_t len);
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bool receive(uint8_t &senderID, char msg[], uint8_t &len);
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private:
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Stream * _stream;
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uint8_t _sendPin = 0;
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uint8_t _deviceID = 0;
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uint16_t _microsPerByte = 1000;
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// EXPERIMENTAL
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uint8_t _bidx = 0;
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uint8_t _buffer[50]; // internal receive buffer
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};
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// -- END OF FILE --
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