One problem I have been having is an interrupt conflict when trying to use Servos as well as SoftSerial

Basically I am trying to use an Uno to read a GPS using SoftSerial but also control model Servos.

Hi, How can I communicate with two shields, a GPS using softserial 4,5 and a GSM shield using softserial 2,3. The baud rate for the GPS is 38400 and for the GSM is 9600. Both shields work fine separately.

i have made a program for sending a sms through a gsm module and i am using a SoftwareSerial , but how to include the SoftwareSerial library bcoz in my program when i write #include the SoftwareSerial is not turning orange

I tried the library with a UART crystal at 11.0592MHz. In theory there should be no communication errors. I modified the delay table. My results:

Serial.print:
– perfect until 115200baud.

Serial.read from Arduino terminal input:
– perfect until 38400baud.
– At 115200baud I can only read the first 4 characters correctly.

Serial.read from other Serial port of Arduino:
– perfect until 57600baud but with an other delay table (not compatible to Serial terminal read)

Is this baud rate limitation based on the crystal speed, or is my delay matrix not good enough?

The matrix:
// baud rxcenter rxintra rxstop tx
{ 115200, 2, 9, 9, 7, }, //puhh
{ 57600, 15, 21, 21, 19, }, //okay
{ 38400, 28, 33, 33, 32, }, //perfect

I am trying to use the 1284P with the Soft Serial library. I am using a “Bobdunio” which is using the mighty1284 core. When I compile the sketch wit the UNO I do not have any issue but when I try to compile it with the 1284 board I get:

C:\Program Files (x86)\Arduino\libraries\SoftwareSerial\SoftwareSerial.cpp: In member function ‘void SoftwareSerial::begin(long int)’:
C:\Program Files (x86)\Arduino\libraries\SoftwareSerial\SoftwareSerial.cpp:401: error: operands to ?: have different types ‘int’ and ‘uint8_t*’
C:\Program Files (x86)\Arduino\libraries\SoftwareSerial\SoftwareSerial.cpp:402: error: expected primary-expression before ‘]’ token
C:\Program Files (x86)\Arduino\libraries\SoftwareSerial\SoftwareSerial.cpp:402: error: operands to ?: have different types ‘int’ and ‘uint8_t*’
C:\Program Files (x86)\Arduino\libraries\SoftwareSerial\SoftwareSerial.cpp: In member function ‘void SoftwareSerial::end()’:
C:\Program Files (x86)\Arduino\libraries\SoftwareSerial\SoftwareSerial.cpp:417: error: expected primary-expression before ‘]’ token
C:\Program Files (x86)\Arduino\libraries\SoftwareSerial\SoftwareSerial.cpp:418: error: expected primary-expression before ‘]’ token
C:\Program Files (x86)\Arduino\libraries\SoftwareSerial\SoftwareSerial.cpp:418: error: operands to ?: have different types ‘int’ and ‘uint8_t*’

Any ideas how to fix it.

Hello everyone…
I am using Arduino for my project. N i m going to transmit camera images through zigbee module. My problem is that i have already connected 0 and 1 pin (TX, Rx) pins of Arduino with zigbee module and my camera is also UART enabled…so i think i have to use Softwareserial library. So suggest me some idea if any and give me code so that i can get idea. Thank You.

Mikel, I wonder if you could be so kind as to take a look at the following thread

http://forum.arduino.cc/index.php?topic=157297.0

A few people are having problems using Software Serial on AtMega1284P, which is becoming more popular.

I’m sure everyone would be very greatful for any insight you could provide towards resolving.

Many thanks

Mick

Hello, I simply want do his:

while (SoftSerial.available())
{
SoftSerial.write(SoftSerial.read());
}

But it don’t work like required… OK, it’s a software serial…

But what I miss is the sei(); in the .write fkt.

– Pit

Hi,

Please could you suggest the best way to add a timeout function to SoftwareSerial ports, in order to avoid lock-up in the event of a missing serial input?

Thanks, Mike.

hello , i need your help when i compile the example have error
(
In file included from NewSoftSerialExample.pde:1:
C:\Program Files (x86)\Arduino\libraries\GSM_Shield/NewSoftSerial.h:71: error: conflicting return type specified for ‘virtual void NewSoftSerial::write(uint8_t)’
C:\Program Files (x86)\Arduino\hardware\arduino\cores\arduino/Print.h:48: error: overriding ‘virtual size_t Print::write(uint8_t)’
)

Hi Mikal,
Thanks for the great library, especially the inversion feature!

I’m using the library with an ATtiny84, and I have two questions:
1. I’m only using Tx, and I would like to not have to dedicate a second pin to Rx. Is there any way to do that?
2. Also, in order to save space in the ATtiny, is there any way to just install the TX function without the Rx function?

Thanks… Ron

Hello,

Do you have any plans to add a timeout function to the SoftSerial library? If not, please could you suggest how best to implement this in a sketch?

Thanks, Mike.

Mikal,
Have one problem – how to use SoftSerial at 14.7456MHz? Library allow only 8/16/20MHz. I have this quartz for 0% transmissin error (Atmega32 datasheet, page 165).
So:
1) how to get DELAY_TABLE PROGMEM table for 14.7456MHz?
2) does 14.7456MHz is out of mind and should simple use 16MHz?

Best regards!
A.

Hello, I am trying to connect a TTL camera to a UdooQuad board. I initially got the code using the NewSoftSerial library but then i switched to the SoftwareSerial lib. I am getting multiple errors one saying “this SoftwareSerial supports only 20 16 and 8Mhz processors.” and a few others that state “error: SREG was not declared.” and “error:cli was not declared”.
I changed all the newSoftSerial parameters to SoftwareSerial but about 30 of these errors repeat themselves. Any idea on what these errrors mean?

thanks a lot

Hello Mikal iam trying to use two RF modules (CC1101) with two arduinos for sending the value of a potintiometer from one side to control a servo on the other side. the library doesn’t work even if it’s newsoftware or softwareserial . maybe I have some problem with writing the code. Can you help me ?
Thank you

that was a problem. I then tried two different boards and it worked thanks Mikal for your help. but still has problem with the code of combining the software serial library code with the code for Knob, check this code out please and feed me back

#include
#include
Servo myservo;
int potpin=0;
int val;
SoftwareSerial mySerial(10, 11); // RX, TX

void setup()

{
myservo.attach(9);
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}

Serial.println(val);

// set the data rate for the SoftwareSerial port
mySerial.begin(9600);
mySerial.println(val);
}

void loop() // run over and over
{
val = analogRead(potpin);
val = map(val, 0, 1023, 0, 179);
myservo.write(val);
delay(15);
if (mySerial.available())
Serial.write(potpin);
potpin = mySerial.read();
if (Serial.available())
mySerial.write(potpin);
potpin = Serial.read();
}

I am using Arduino 1.5.4, but SoftwareSerial seems to use the variant of flush() which was removed from the Arduino libraries such as Stream, Serial etc as from Arduino 1.0. Instead of waiting until any output has been transmitted, it deletes all data which are in the incoming buffer.

Is this intentional? If not, could it be updated?

Apart from this, it’s a very nice library!

Hi Mikal,
In C++, flush() is a standard function for flushing output streams. So it’s really confusing to find a function called flush which flushes input.
I suggest that the function should have a different name. How about iflush?
Hopefully this wouldn’t be a big problem for most people, as my guess is that it is not used very much.

All the best,
Robin

Mikal,

First off thanks for sharing your hard work.
I am not having any luck getting the SoftwareSerial to work with my Fio V3. I am trying to get data from a GP-635T GPS sensor. Every time I use your example “Simple test” I do not receive any data from the sensor when using the Software Serial library on pins 4(RX), and 3(TX). But if I modify the code to use the hardware serial instead, and hook the GPS up to that I do get some data in. Although it is not good data it appears I am not getting a lock. But for now I am focusing on the Software Serial issue. Have you or anyone else had any success using the Arduino Fio V3 and Software Serial? Any suggestions you or anyone else could provide would be great. Thanks for your time.

Hi Mikal:

Great library, but reading through the code .. the ring buffer is updated from an ISR so shouldn’t all methods that access the ring buffer (like read(), available(), etc.) disable interrupts while processing?

Regards,

Martin