Hi, i am new to ucontroller programming. I wanted to make some password and 7-segment display projects using 4x4 matrix keyboard as input, in C. I just need some simple example links or sample code or part to understand how to decode the keypad inputs. Thanks in advance.
Thanks for your guidence. I searched, i too got 5000 hits, but few sites has huge code structure, and few has very small ones. I gone through the codes also, but cant get easily, since compilers also different. So i thought that i may be wasting time. Then only i came here for help directly for keil. Because its easy for someone to direct me to a nice ones. Then i can read it confidentialy.
In other words, what you don't need is any source code at all!
What you do need is a basic understanding of the principles - irrespective of any processor, programming, or compiler.
You may be better to start looking for books or sites on basic (digital) electronics...
I knew basic concepts of Digital as well as C programing. That only made me to complete handson on led blinking, 7-segment driving, LCD display driving etc. that too googling myself and some reference books.
Right now i am experimenting with keypad and RS232 serial communication with 89c51. Even again and again going through the code for keypad to understand, i feel difficult to catch every steps. Anyhow i am going through your code. Will try to catch the concept soon. If i have doubt, the only option is asking others experts. Thats wat created the thread in this topic.
just a bit of help
keys must be debounced
Erik
You can use the Keypad encoder IC such as DFL-KEY55A or DFL-Key55B, which can convert the key pressed to RS232. Click on www.dafulaielectronics.com
You can use the Keypad encoder IC