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Implementation of the Arduino software serial library for the ESP8266 / ESP32. This fork implements interrupt service routine best practice. Hi there, I'm working on a project which uses a GPS and thus needs to acquire the data through the Serial port (software serial, in this case). I ran into a problem: since I'm doing other stuff inside the loop, which can take up to 350ms, sometimes the Serial buffer is not reached when the data comes from the GPS, and since the Serial buffer only holds up to 64B of memory, I end up losing most.
The SoftSerial page doesn't mention any restrictions for a 328 based boards and the Pro-Mini uses a 328 MCU. The page does mention that it uses pin change interrupts and that's why there are restrictions on which pins can be used on other Arduinos. D11 is the MOSI pin, Port B pin 3. D12 is the MISO pin, Port B pin 4.
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D13 is the SCLK pin, Port B pin 5. Those are PCINT3-5 which should, if configured properly, trigger PCI0. So I have to guess that the SoftSerial library isn't configuring that interrupt correctly or there's something in your code that's competing for use of those pins??? You're not including the SPI library or trying to do anything 'SPI-ish' are you?D8-10 are on Port B as well and so are served by PCI0 as well.D6, D7 are Port D, as are D4 and D5, so that's a different PCIx pin change interrupt. It's odd that D4 and D5 would work if D6 and D7 don't.Other than that I don't know.
![Software Serial Interrupt Software Serial Interrupt](http://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/166/Screen-Shot-2018_2D00_07_2D00_02-at-7.42.47-PM.png)
Have you searched for any SoftSerial problems related to D11 or D12 or D13 or??
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