Multiple Key Press using AVR ATmega128 and 4x4 keypad
时间：04-07
整理：3721RD
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Hello everyone....
I have bought a 4x4 matrix keypad and wish to implement it in my project involving AVR ATmega128.
I have successfully tested it and am able to detect SINGLE key-presses.
Next I wanted to implement mobile-phone type keypad using my 4x4 keypad where suppose i press a key
one then "1" is displayed but if i press the SAME KEY twice then "A" is displayed and similarly if I press the SAME KEY
THREE times in a row then "B" is to be displayed. This goes for all keys until a fully Alpha-Numeric keypad
is established.
That is the problem I am facing. I am unable to detect multiple key presses of the SAME KEY.
Also, the code needs to be small so that not much CPU Time is consumed there because
I have other big issues to take care with the CPU.
I would appreciate any help from you. Any code links would greatly ease my problems.
I have been searching GOOGLE for days but all in vain.
Thank you in advance..
I have bought a 4x4 matrix keypad and wish to implement it in my project involving AVR ATmega128.
I have successfully tested it and am able to detect SINGLE key-presses.
Next I wanted to implement mobile-phone type keypad using my 4x4 keypad where suppose i press a key
one then "1" is displayed but if i press the SAME KEY twice then "A" is displayed and similarly if I press the SAME KEY
THREE times in a row then "B" is to be displayed. This goes for all keys until a fully Alpha-Numeric keypad
is established.
That is the problem I am facing. I am unable to detect multiple key presses of the SAME KEY.
Also, the code needs to be small so that not much CPU Time is consumed there because
I have other big issues to take care with the CPU.
I would appreciate any help from you. Any code links would greatly ease my problems.
I have been searching GOOGLE for days but all in vain.
Thank you in advance..