Enables sending and receiving data using the RS-485 standard with RS-485 shields, like the MKR 485 Shield.
This library supports the Maxim Integrated MAX3157 and equivalent chipsets.
For more information about this library please visit us at http://www.arduino.cc/en/Reference/ArduinoRS485
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@dependabot rebase will rebase this PR@dependabot recreate will recreate this PR, overwriting any edits that have been made to it@dependabot merge will merge this PR after your CI passes on it@dependabot squash and merge will squash and merge this PR after your CI passes on it@dependabot cancel merge will cancel a previously requested merge and block automerging@dependabot reopen will reopen this PR if it is closed@dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually@dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)@dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)@dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)Related issue: https://github.com/arduino-libraries/ArduinoRS485/issues/29
I preferred to change the two lines (if and digitalwrite) instead of the pinmode one to keep consistency (in the remaining parts of the library DE is always before RE)
type: imperfection topic: codeHello
While debugging an (unrelated) issue I had a look at the source code of the library and found this in the end function in RS485.cpp (line 75 and following):
if (_rePin > -1) {
digitalWrite(_rePin, LOW);
pinMode(_dePin, INPUT);
}
if (_dePin > -1) {
digitalWrite(_dePin, LOW);
pinMode(_rePin, INPUT);
}
I think the _dePin and _rePin in the pinMode functions are swapped.
I assume this is not a real issue, since not a lot of people would use the end function, but for completeness sake maybe it is to fix
type: imperfection conclusion: resolved topic: codeThis modification will allow this library to be used with alternate serial ports on boards that have more than one hardware serial port. Changes originally found here: https://forum.arduino.cc/t/arduinomodbus-for-other-shields-and-with-different-serial-port/878764
type: enhancementAdd ::setDelays to set _preDelay an _postDelay not at ::begin.
This helps to reuse the library in already dependent libraries (e.g. ArduinoModbus) without changes downstream.
Tested successfully with ArduinoModbus on Arduino Portenta Machine Control.
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I followed some dmx-tutorial and wired my nano to pins A5 and A6 which are and were working great. Then I added an interrupt to the code with incoming pin 2 and it didn't work out with the this library anymore. I fixed the thing by commenting out definitions inside the #ifdef AVR part on the rs485.h and replacing the pins with A5 and A6 (like they are again underneath) and now I think everything works pretty much as they should on nano. I just really don't understand at this point, how did the dmx work earlier with A5 and A6?
type: imperfectionI want to used this with a standalone TTL to RS485 IC on a Teensy. Can you tell me what serial pins are used in the library for TX, RX, RE (receiver enable) and DE (driver enable). Also where in the code is the serial port and the control pins defined or can be changed?
In last update of ESP8266 SDK, I got many errors:
.pio\libdeps\esp12e\ArduinoRS485\src\RS485.cpp:65:28: error: invalid conversion from 'uint16_t' {aka 'short unsigned int'} to 'SerialConfig' [-fpermissive]
error occurs in _serial->begin call.
I solved problem with following changes:
In RS485.h:
#ifdef __AVR__
#define RS485_DEFAULT_DE_PIN 2
#define RS485_DEFAULT_RE_PIN -1
#elif defined(ESP32) || defined(ESP8266)
#define RS485_DEFAULT_DE_PIN 0
#define RS485_DEFAULT_RE_PIN 0
#else
#define RS485_DEFAULT_DE_PIN A6
#define RS485_DEFAULT_RE_PIN A5
#endif
#if defined(ESP32) || defined(ESP8266)
#define RS485_SER_CONF_TYPE SerialConfig
#else
#define RS485_SER_CONF_TYPE uint16_t
#endif
....
class RS485Class{
....
RS485_SER_CONF_TYPE _config;
...
}
In RS485.cpp:
_serial->begin(baudrate, (RS485_SER_CONF_TYPE)config);
Currently (1.0.0), the library automatically creates a RS485 object running on the SERIAL_PORT_HARDWARE serial port (https://github.com/arduino-libraries/ArduinoRS485/blob/master/src/RS485.cpp#L181).
Although it might be idiomatic for Arduino libraries to automatically create an object to work with, for this library it causes trouble on some platforms and use cases:
Serial, you still have to live with the automatically created RS485 object on Serial, which is a waste of memory.Serial is of type USBSerial. As the RS485 constructor only accepts HardwareSerial, and you cannot set another Serial port, this causes that the library cannot be compiled for these platforms. Workaround is to remove L181 of RS485.cpp.So actually, I propose two changes:
Stream as interface type for the RS485 constructor, so it can be created with HardwareSerial as well as with USBSerial interfaces.SERIAL_PORT_HARDWARE, but rather require the user to actively chose the desired port as a parameter in the begin method (I guess it is ok to have SERIAL_PORT_HARDWARE as the default value for the port parameter.) Drawback: This change is not backwards-compatible. Current users of the library will have to add a line to create the RS485 object manually.
#ifdef...endif clause to check for these boards.#define CONTROLLINO_MAXI or #define CONTROLLINO_MEGA in their sketch. In such a case, I added a clause inside src/RS485.h, which tries to load the CONTROLLINO library.Full Changelog: https://github.com/arduino-libraries/ArduinoRS485/compare/1.0.3...1.0.4
Source code(tar.gz)Full Changelog: https://github.com/arduino-libraries/ArduinoRS485/compare/1.0.2...1.0.3
Source code(tar.gz)
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