Keypad with 4 digit 7 segment

[Dark_CCS]

I need code.

Project materials: PIC16F877A, 4x4 keypad, 4 digit on 7-Segment Display.

For example : If I press number '4' , the number will be shown on display. Then if I press number '5', the number will be shown and the number '4' will be kept and passed to left display. Then if I press number '3', the number will be shown and the number '5' will be kept and passed left. The number '4' will be passed again to the left. At the end if we want to look 7 segment display, we will see the numbers like this '4 5 3'. The process will be go like this. Every number will be shown and the before kept number will be pass to left.

[PCM programmer]

Create an array that holds 4 bytes.

Call the keypad routine to wait for a key to be pressed.

Shift the array to the left by 1 byte. Do this a byte at a time.

Write the character received from the keypad to the LSB of the array.

Copy the whole array to the display.