MicroPython Forum (Archive)

Posted: **Fri Nov 26, 2021 1:24 pm**

I created a simple script to read scan codes from PS/2 Keyboard, like this:

from machine import UART
import os
import sys
import time
os.dupterm(None, 1)

keyCodes = {
  139: 'Q', 207: 'W', 194: 'E', 199: 'R', 134: 'T', 203: 'Y', 203: 'U', 161: 'I', 226: 'O', 231: 'P', 
  142: 'A', 205: 'S', 145: 'D', 213: 'F', 154: 'G', 217: 'H', 157: 'J', 224: 'K', 224: 'K', 229: 'L', 
  140: 'Z', 208: 'X', 209: 'C', 148: 'V', 152: 'B', 153: 'N', 204: 'M', 225: ',', 165: '.', 149: '_', 164: '?', 
  138: '1', 206: '2', 146: '3', 147: '4', 214: '5', 218: '6', 159: '7', 158: '8', 162: '9', 163: '0'
}

uart = UART(0, baudrate=10000,bits=8, parity=None, stop=1)
dataList = []

while True:
    if uart.any():
        data = bytearray(1)
        uart.readinto(data, 1)
        dataList.append(data[0])
        if len(dataList) == 3:
            if dataList[0] in keyCodes:
                sys.stdout.write(letter)
            elif data[0] == 220:
                sys.stdout.write("\n")
            dataList = []
            time.sleep_us(1000)

It works well and prints pressed characters from the keyboard.

However, I am not sure how can I feed the keypresses to STDIN, so they are treated by Python Interpreter in the same way as letters typed via WebRepl for example.

Any help would be appreciated.

Posted: **Fri Nov 26, 2021 6:16 pm**

You should be able to use os.dupterm: https://docs.micropython.org/en/latest/ ... os.dupterm to implement this.
Caveat - I haven't tried this myself.

Posted: **Fri Nov 26, 2021 8:30 pm**

Talking about dupterm, the code i pasted above is working on ESP8266.

I am not sure why dupterm seems to be behaving differently on ESP32. Any dupterm command with Index value different to 0 results in an error:
ValueError: invalid dupterm index

MicroPython Forum (Archive)

PS/2 Keyboard as STDIN

PS/2 Keyboard as STDIN

Re: PS/2 Keyboard as STDIN

Re: PS/2 Keyboard as STDIN