Implement Inverse flag to invert sense of RX and TX like SoftwareSerial #60
Description
As a user I need to reverse the sense of the RX and TX lines to communicate with a particular piece of hardware as in SoftwareSerial, but I also need the full-duplex communication support of AltSoftSerial.
Description
Please see Pull Request #59
New feature. Add the Inverse flag to AltSoftSerial Library with appropriate constructors. In the Transmission and Reception code, invert the outputs with the flag is true. When the flag is the default value of false, the code functions exactly as before. The original constructors are unchanged.
Steps To Reproduce Problem
New Feature.
Hardware & Software
Tested with an Sparkfun RedBoard Arduino
Arduino IDE version 1.18.10
Teensyduino version (if using Teensy)
1802 Membership Card running MCSMP20J ROM (with inverse logic on the RX and TX lines)
and for regression testing
1802 Membership Card running MCPSMP20A ROM (with positive logic on RX and TX lines)
Arduino Sketch
// Change the code below by your sketch (please try to give the smallest code which demonstrates the problem)
#include <Arduino.h>
/*
Serial Connections for 1802 Membership Card MCSMP20J
Arduino Pin MCard1802
9 (TX) /EF3 (RX) P1 - 27
8 (RX) Q (TX) P1 - 12
GND GND P1 - 1 (or P1 - 30)
*/
//Note: SoftwareSerial is *NOT* Full-duplex and won't work here.
#include <AltSoftSerial.h>
//RX pin 8, TX pin 9, with RX and TX inversion
AltSoftSerial altSerial(true);
void setup() {
//Initialize serial for input and debugging
Serial.begin(115200);
//Initialize AltSoftSerial for communication to 1802
altSerial.begin(1200);
Serial.println("Ready!");
//Establish communication with <CR>
altSerial.write('\r');
}
void loop() {
// If anything comes from Arduino IDE
if (Serial.available()) {
// get the new byte:
char nextChar = (char)Serial.read();
altSerial.write(nextChar);
//wait a bit for 1802 to process character sent
delay(20);
}
if (altSerial.available()) {
// get the new byte:
char inChar = (char) altSerial.read();
//Mask off high bit
inChar = (inChar & 0x7F);
//Write to Arduino Serial Monitor
Serial.write(inChar);
} // if altSerial.available
}I have submitted pull request #59 to add the support for the inverse argument to the AltSoftSerial library. Merging Pull Request #59 will close this issue.