Arduino Mega PS2, don't work after power on off

[Vindhyachal.takniki]

1.  I am using arduino mega 2560. A PS2 keyboard is connected to read keys & display on segment. Library used is PS2Keyboard.cpp - PS2Keyboard library Written by Christian Weichel <info@32leaves.net>

2. Issue faced is, when power in turned off & applied again on entire system(MCU+PS2 converter+usb keyboard), keyboard don't get initialized again automatically, that is I am not able to read any keys unless I remove the keyboard from socket & connect again, then I can read again.

3. There is small USb to PS2 converter used. Keyboard is usb.

4. what could be issue.

5. below is keyboard code:

const int DataPin = 19;
const int IRQpin =  18;
PS2Keyboard keyboard;


    keyboard.begin(DataPin, IRQpin); 
    keyboard.clear();
            c = keyboard.read();
            Serial.println(c);   

[brybot]

Are you able to get a scope trace on your data lines?

There is a #define option for INPUT_PULLUP, and the documentation mentions that PS2 keybaords contain pullup resistors. I wonder what your adapter is doing, and whether the pullups or lackthereof could be messing up the initialization. Especially if the pullup is latching up the processor through the GPIO.

https://www.pjrc.com/teensy/td_libs_PS2Keyboard.html

[Vindhyachal.takniki]

Hi,

rest of code works fine no issues in that.
Only ps2 keboard dont work.

I have tried both methods, pull up enable or diable in code, but both didnt worked.

Also why keyboard worked when i remove it & connect it again from usb porint., while converter remians connected, i dont understand this