Cannot configure latest espsoftwareserial to work with V9261F device

[Demonic098]

Older commit (git checkout f4f8fcf ) works without problem with V9261F device
older working serial init:

#define V9261F_BAUDRATE                 4800 
SoftwareSerial * _serial = NULL;
 . . .
 . . . 
  _serial = new SoftwareSerial(4, SW_SERIAL_UNUSED_PIN, true, 256);
  _serial->begin(V9261F_BAUDRATE);

But newer version doesn't work no matter how to configure :

            _serial = new SoftwareSerial(4, -1, true);
            _serial->enableIntTx(false);
            _serial->begin(V9261F_BAUDRATE, SWSERIAL_8O1);

I also tried 8O2, 8N1, 8N2, 8E1, 8E2
but according to V9261F manual

 -  A 11-bit byte, composed of 1-bit Start bit, 8-bit Data bits, 1-bit Parity bit (Odd), and 1-bit Stop bit
 -  Least significant bit (lsb) shifted in or out firstly when the chip receives or transmits a byte

[dok-net]

Why are you driving the lines in inverted logic?

[Demonic098]

because this is how it is physically connected

[Demonic098]

https://github.com/iotfridgesaver/WiFiPowerSensor/blob/master/PowerMeter.pdf
i use the following schematic and use gpio4 instead of gpio2

[svdrummer]

I checked the input current. Seems okay. Your drawing shows you are using an esp01. The RX pin is IO3. You said you are using io4

[Demonic098]

Its not my drawing. And i am using ESP-12E

[Demonic098]

and yes i am using GPIO04

[svdrummer]

Helps if we have the basics :)

[Demonic098]

v9261f sensor connected thru the optocoupler

[Demonic098]

http://www.vangotech.com/uploadpic/151321699962.pdf
UART configuration at page 53

[Demonic098]

if it really helps i can redraw the schematics according to my wiring diagram. I am using ESP-12E GPIO04 pin to read data from V9261F sensor thru optocoupler in inverted configuration.

[dok-net]

@Demonic098 Thanks for providing your hardware diagrams. There may be an issue with the altered pullup states since the three year old release you were using until now. Please carefully inspect the README, to setup you build environment correctly, and try out the latest EspSoftwareSerial release 6.14.0 that is part of ESP8266 Arduino Core's master branch.
Call this to disable internal pullup of the Rx pin, probably before calling begin():

    _serial->enableRxGPIOPullup(false);

[Demonic098]

@dok-net ok i'll do that but i don't think internal pullup resistor has any impact on anything since optocoupler on active high connects pin directly to ground.