Software emulated serial using hardware timers for improved compatibility

Overview

AltSoftSerial Library

Improved software emulated serial, using hardware timers for precise signal timing and availability of CPU time for other libraries to respond to interrupts during data AltSoftSerial data transmission and reception.

http://www.pjrc.com/teensy/td_libs_AltSoftSerial.html

AltSoftSerial on Teensy 2.0

If you need very low baud rates, check out SlowSoftSerial by Paul Williamson.

Issues
  • Add Support for ATMEGA328PB Please

    Add Support for ATMEGA328PB Please

    Description

    Describe your problem.

    Does not appear to have support for ATMEGA328PB.

    Steps To Reproduce Problem

    Please give detailed instructions needed for anyone to attempt to reproduce the problem.

    Just try compiling for ATMEGA328PB

    Hardware & Software

    ATMEGA328PB

    Errors or Incorrect Output

    Error while detecting libraries included by C:\Users\maeso\Documents\Arduino\libraries\AltSoftSerial\AltSoftSerial.cpp

    opened by maesoph 0
  • Support Request for Arduino Portenta

    Support Request for Arduino Portenta

    Support Request for Arduino Portenta

    The new Arduino Portenta has several UART's if using the Breakout Board but by itself it only has SerialUSB and Serial1 at D13, D14, which would be fine if it were single core but it is a dual core board. Any chance of getting AltSoftSerial working on this board. I would test any changes you suggest.

    I tried #define ARDUINO_AVR_SODAQ_MBILI which would use pins 5, 6 but it errored on #define ALTSS_BASE_FREQ F_CPU

    I will search a bit about that. Any opinions on if this could get running?

    opened by hpssjellis 1
  • Implement Inverse flag to invert sense of RX and TX like SoftwareSerial

    Implement Inverse flag to invert sense of RX and TX like SoftwareSerial

    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.

    opened by fourstix 2
  • Implement Inverse flag to invert sense of RX and TX like SoftwareSerial

    Implement Inverse flag to invert sense of RX and TX like SoftwareSerial

    This pull request implements the inverse flag so that AltSoftSerial inverts the sense of RX and TX similar to the inverse flag in SoftwareSerial library.

    Unlike the earlier pull request from @BikeMike, the inverse flag affects the sense of both the RX and TX pins. The earlier request only inverted the sense of one line, so it was a partial implementation. This pull request is a full implementation.

    This code has been tested with an inverse serial line device, and a device running with the normal sense of the lines. Code that ran fine with AltSoftSerial runs fine with this change.

    I implemented this change because I needed to reverse the sense of the lines to communicate with a particular piece of hardware, but I also need full-duplex communication.

    This change allows me to run AltSoftSerial to achieve those goals.

    opened by fourstix 1
  • Support for Teensy 4.0

    Support for Teensy 4.0

    Description

    I am unable to compile any sketches that include <AltSoftSerial.h> against the Teensy 4.0 items I've purchased.

    Steps To Reproduce Problem

    I am using Arduino IDE 1.8.10 and the latest Teensy Loader 1.48. I can compile sketches (but not upload) for all the Teensy boards under the IDE Tools\Board:\Boards Manager up through Teensy 3.6. In looking at the AltSoftSerial-master\config\AlstSoftSerial_Boards.h, Teensy 2.0, Teensy++2.0 and Teensy 3.x are listed (and other makes of boards), but nothing specifically w.r.t. a Teensy 4.0.

    Hardware & Software

    Board Teensy 4.0 Shields / modules used None Arduino IDE version 1.8.10 Teensyduino version (if using Teensy) 1.48 Version info & package name (from Tools > Boards > Board Manager) Teensy 2.0 through Teensy 4.0 Operating system & version Windows 10 Pro Any other software or hardware? None yet

    NOTE: I do have alternative AltSoftSerial installs, but they are all the current 1.4 version.

    Arduino Sketch

    Verbatim: --- #include <AltSoftSerial.h>

    AltSoftSerial altSerial;

    void setup() { Serial.begin(9600); Serial.println("AltSoftSerial Test Begin"); altSerial.begin(9600); altSerial.println("Hello World"); }

    void loop() { char c;

    if (Serial.available()) { c = Serial.read(); altSerial.print(c); } if (altSerial.available()) { c = altSerial.read(); Serial.print(c); } }

    Errors or Incorrect Output

    Arduino: 1.8.10 (Windows 10), TD: 1.48, Board: "Teensy 4.0, Serial, 600 MHz, Faster, US English"

    C:\Program Files (x86)\Arduino_1_8_10\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino_1_8_10\hardware -hardware C:\Users\glsw0\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino_1_8_10\tools-builder -tools C:\Program Files (x86)\Arduino_1_8_10\hardware\tools\avr -tools C:\Users\glsw0\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino_1_8_10\libraries -libraries C:\Users\glsw0\OneDrive\Documents\Arduino\libraries -fqbn=teensy:avr:teensy40:usb=serial,speed=600,opt=o2std,keys=en-us -ide-version=10810 -build-path C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522 -warnings=default -build-cache C:\Users\glsw0\AppData\Local\Temp\arduino_cache_74529 -verbose C:\Users\glsw0\OneDrive\Documents\Teensy\sketch_nov09a\sketch_nov09a.ino C:\Program Files (x86)\Arduino_1_8_10\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino_1_8_10\hardware -hardware C:\Users\glsw0\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino_1_8_10\tools-builder -tools C:\Program Files (x86)\Arduino_1_8_10\hardware\tools\avr -tools C:\Users\glsw0\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino_1_8_10\libraries -libraries C:\Users\glsw0\OneDrive\Documents\Arduino\libraries -fqbn=teensy:avr:teensy40:usb=serial,speed=600,opt=o2std,keys=en-us -ide-version=10810 -build-path C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522 -warnings=default -build-cache C:\Users\glsw0\AppData\Local\Temp\arduino_cache_74529 -verbose C:\Users\glsw0\OneDrive\Documents\Teensy\sketch_nov09a\sketch_nov09a.ino Using board 'teensy40' from platform in folder: C:\Program Using core 'teensy4' from platform in folder: C:\Program Detecting libraries used... "C:\Program Files (x86)\Arduino_1_8_10\hardware\teensy/../tools/arm/bin/arm-none-eabi-g++" -E -CC -x c++ -w -g -Wall -ffunction-sections -fdata-sections -nostdlib -std=gnu++14 -fno-exceptions -fpermissive -fno-rtti -fno-threadsafe-statics -felide-constructors -Wno-error=narrowing -mthumb -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-d16 -D__IMXRT1062__ -DTEENSYDUINO=148 -DARDUINO=10810 -DF_CPU=600000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH "-IC:\Program Files (x86)\Arduino_1_8_10\hardware\teensy\avr\cores\teensy4" "C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522\sketch\sketch_nov09a.ino.cpp" -o nul Alternatives for AltSoftSerial.h: [[email protected]] ResolveLibrary(AltSoftSerial.h) -> candidates: [[email protected]] "C:\Program Files (x86)\Arduino_1_8_10\hardware\teensy/../tools/arm/bin/arm-none-eabi-g++" -E -CC -x c++ -w -g -Wall -ffunction-sections -fdata-sections -nostdlib -std=gnu++14 -fno-exceptions -fpermissive -fno-rtti -fno-threadsafe-statics -felide-constructors -Wno-error=narrowing -mthumb -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-d16 -D__IMXRT1062__ -DTEENSYDUINO=148 -DARDUINO=10810 -DF_CPU=600000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH "-IC:\Program Files (x86)\Arduino_1_8_10\hardware\teensy\avr\cores\teensy4" "-IC:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial" "C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522\sketch\sketch_nov09a.ino.cpp" -o nul "C:\Program Files (x86)\Arduino_1_8_10\hardware\teensy/../tools/arm/bin/arm-none-eabi-g++" -E -CC -x c++ -w -g -Wall -ffunction-sections -fdata-sections -nostdlib -std=gnu++14 -fno-exceptions -fpermissive -fno-rtti -fno-threadsafe-statics -felide-constructors -Wno-error=narrowing -mthumb -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-d16 -D__IMXRT1062__ -DTEENSYDUINO=148 -DARDUINO=10810 -DF_CPU=600000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH "-IC:\Program Files (x86)\Arduino_1_8_10\hardware\teensy\avr\cores\teensy4" "-IC:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial" "C:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial\AltSoftSerial.cpp" -o nul Error while detecting libraries included by C:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial\AltSoftSerial.cpp Generating function prototypes... "C:\Program Files (x86)\Arduino_1_8_10\hardware\teensy/../tools/arm/bin/arm-none-eabi-g++" -E -CC -x c++ -w -g -Wall -ffunction-sections -fdata-sections -nostdlib -std=gnu++14 -fno-exceptions -fpermissive -fno-rtti -fno-threadsafe-statics -felide-constructors -Wno-error=narrowing -mthumb -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-d16 -D__IMXRT1062__ -DTEENSYDUINO=148 -DARDUINO=10810 -DF_CPU=600000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH "-IC:\Program Files (x86)\Arduino_1_8_10\hardware\teensy\avr\cores\teensy4" "-IC:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial" "C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522\sketch\sketch_nov09a.ino.cpp" -o "C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522\preproc\ctags_target_for_gcc_minus_e.cpp" "C:\Program Files (x86)\Arduino_1_8_10\tools-builder\ctags\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522\preproc\ctags_target_for_gcc_minus_e.cpp" Compiling sketch... "C:\Program Files (x86)\Arduino_1_8_10\hardware\teensy/../tools/precompile_helper" "C:\Program Files (x86)\Arduino_1_8_10\hardware\teensy\avr/cores/teensy4" "C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522" "C:\Program Files (x86)\Arduino_1_8_10\hardware\teensy/../tools/arm/bin/arm-none-eabi-g++" -x c++-header -O2 -g -Wall -ffunction-sections -fdata-sections -nostdlib -MMD -std=gnu++14 -fno-exceptions -fpermissive -fno-rtti -fno-threadsafe-statics -felide-constructors -Wno-error=narrowing -mthumb -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-d16 -D__IMXRT1062__ -DTEENSYDUINO=148 -DARDUINO=10810 -DF_CPU=600000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH "-IC:\Program Files (x86)\Arduino_1_8_10\hardware\teensy\avr/cores/teensy4" "C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522/pch/Arduino.h" -o "C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522/pch/Arduino.h.gch" "C:\Program Files (x86)\Arduino_1_8_10\hardware\teensy/../tools/arm/bin/arm-none-eabi-g++" -c -O2 -g -Wall -ffunction-sections -fdata-sections -nostdlib -MMD -std=gnu++14 -fno-exceptions -fpermissive -fno-rtti -fno-threadsafe-statics -felide-constructors -Wno-error=narrowing -mthumb -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-d16 -D__IMXRT1062__ -DTEENSYDUINO=148 -DARDUINO=10810 -DF_CPU=600000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH "-IC:\Users\glsw0\AppData\Local\Temp\arduino_build_872522/pch" "-IC:\Program Files (x86)\Arduino_1_8_10\hardware\teensy\avr\cores\teensy4" "-IC:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial" "C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522\sketch\sketch_nov09a.ino.cpp" -o "C:\Users\glsw0\AppData\Local\Temp\arduino_build_872522\sketch\sketch_nov09a.ino.cpp.o" In file included from C:\Users\glsw0\OneDrive\Documents\Teensy\sketch_nov09a\sketch_nov09a.ino:1:0:

    C:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial/AltSoftSerial.h: In static member function 'static void AltSoftSerial::begin(uint32_t)':

    C:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial/AltSoftSerial.h:37:25: error: 'F_BUS' was not declared in this scope

    #define ALTSS_BASE_FREQ F_BUS

                         ^
    

    C:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial/AltSoftSerial.h:47:43: note: in expansion of macro 'ALTSS_BASE_FREQ'

    static void begin(uint32_t baud) { init((ALTSS_BASE_FREQ + baud / 2) / baud); }

                                           ^
    

    Multiple libraries were found for "AltSoftSerial.h" Used: C:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial Using library AltSoftSerial at version 1.4 in folder: C:\Users\glsw0\OneDrive\Documents\Arduino\libraries\AltSoftSerial Error compiling for board Teensy 4.0.

    Regards.

    opened by GLBaxter 2
Releases(1.4)
Owner
Paul Stoffregen
Entrepreneur & electrical engineer with 29 years of professional experience and life-long passion for overly ambitious projects
Paul Stoffregen
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