User manual

LPCXpresso Experiment Kit - User’s Guide

Page 65

Figure 36 – Breadboard Connections for 7-segment Display

The same eight outputs are used as in the experiments with the 8 running LEDs, except for LED4 and

LED5:

 LED1 (GPIO_4-LED-SSEL) corresponds to segment A

 LED2 (GPIO_8-LED-SSEL) corresponds to segment B

 LED3 (GPIO_9-LED-SSEL) corresponds to segment C

 GPIO_36 controls segment D

 GPIO_37 controls segment E

 LED6 (GPIO_23-LED) corresponds to segment F

 LED7 (GPIO_22-LED) corresponds to segment G

 LED8 (GPIO_21-LED) corresponds to segment DP

Create a program that increment a digit, 0-9 each second. It shall roll-over to 0 when 9 is reached. Let

the dot LED light for 100 ms after an increment.

A suitable program structure is to create a subroutine that takes a number (0-9) as input and sets the

appropriate segment outputs for each input value.

As a variation to above, modify the code so that every time you press the push-button the number is

incremented.

Another variation is to create a program that creates a “running one” segment in a circular structure

(segment A->B->C->D->E->F->A, etc.).