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PaulStoffregen / AltSoftSerial

Software emulated serial using hardware timers for improved compatibility
http://www.pjrc.com/teensy/td_libs_AltSoftSerial.html
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Problem at 2400 baud (atmega328) #32

Closed simonecab closed 7 years ago

simonecab commented 7 years ago

This library is a great work. I need to use at the same time a GSM modem (on AltSoftSerial) and another device on SoftwareSerial that supports max 38Kbaud, thus I need to use the modem at 2400 baud. The issue is: at 2400 baud in some situation (but sistematically) the first bytes of some TX packets are not transmitted. This appears to be influenced by the previous bytes transmitted. I do not have performance issues so I could perform any kind of reset.

PaulStoffregen commented 7 years ago

Please check to make sure you have version 1.4.

If you want me to investigate, I need code and details to reproduce the problem. I do not investigate issues until complete info is posted.

simonecab commented 7 years ago

You are perfectly right! I understand so well. The version is 1.4. I'll try to reproduce the issue in a standalone manner (not easy due to custom hw!). I will try to reproduce the issue with a couple of atmega328, the second one with the HW serial at 2400baud doing a delayed echo.

If you have any hint (something like debug print or similar) please let me know! Just for info, now I have an ORRIBLE workaround, I put 8 spaces before the AT commands... this makes things working (so far) :-)

simonecab commented 7 years ago

I apologize! The problem is in the modem as far as I can understand.