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33 Threads found on Keyboard Scan
I need to keep in my register playerAkeyb(7 downto 0) data about which key is down or not. Right not I am using testled for debugging. If I do not look which particular key was pressed, the code works well. If I check wether the key pressed was something particular(stored in playerAkeys(4)), then the behaviour is random(sometimes work, someti
The calculator would work by running a program in the 89C669. This is a microcontroller that is based on the 8051 core. These chips do nothing until programmed. The part must be programmed to scan the keyboard, interpret the keystrokes, perform the arithmetic, and display the results to the seven segment display. The reason, no one has respon
hi in this desing 7pins are engaged, then what is the use??? you can design same keyboard in 4x3 matrix with 7pins. regards
design a keyboard scanner that will scan a matrix of 4*4 and give out a four bit binary code of the key presses .Also it will assert a signal 'valid' when key is presses.Use with debounce
Hi guys! I'm searching for a method to adapting a PS/2 keyboard to a RS-232 serial port. The scope is to read the bits of each key pressed from the keyboard. With a simple software, I remain to listen on this COM port. I've realized a simpele connection: DATA --> RX VCC --> VCC GND --> GND The
Hi, is there a way to "scan" keyboard strokes during a verilog testbench simulation (instead of using a file) ? Thx
keyboard manual: (by pulling the "Clock" line low), so no other scan codes will be received until the input buffer is emptied. i need do: if key>null then lowbuffer anyone canb help me? many tanks
Translation from one code to the other is not difficult thing at all .. You will need a microcontroller which will take an ASCII character from serial port and, using a look-up table, will translate it from ASCII to PS/2 keyboard, and will output the new code through the same port or in any different way .. You will have to create a look-up table
There is code on AVR freaks that you should be able to adapt to the Mega
This is not so easy to do with a matrix keyboard as it will just read this first keypress in the scan routine. IanP has the right idea. I would do it with a timed subroutine of a few seconds which is entered when you press #. You could then add an offset to your normal codes to give you a new set. So the procedure would be to press # followed by an
EXT-interrupt or scan-mode all can realize this function EXT-interrupt: use two ext-interrupt input I/O for sw1 and sw2,it like keyboard circuit. scan-mode: with special interval time to scan sw1 and sw2,If it have press signal ,then enter sub-function to do with it.
tango_ang, can you post how you connected the keyboard to your cpu? I assume your rows are set high by your cpu so when you press two keys in different rows but in the same column you get a short circuit between the two rows. If all your rows are programmed as outputs one pin will have H level and the other pin will have low level and these t
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