Digilent Basys MX3 - Connectivity; Functionality

Basys MX3™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 17 of 56
Figure 5.1. Button schematic diagram.
The Basys MX3 also has a red button labeled RESET. This button is connected directly to the MCLR pin of the PIC32
and will trigger it to be reset.
5.1 Connectivity
Label
Schematic
Name
PIC32 Pin
Pin Shared
With
Description
BTNU
BTNU
PGEC1/AN1/RPB1/CTED12/RB1
PGC
Button up
BTNL
BTNL
PGED1/AN0/RPB0/RB0
PGD
Button left
BTNC
BTNC
RPF0/PMD11/RF0
TRIG_1
Button center
BTNR
BTNR
AN8/RPB8/CTED10/RB8
S0_PWM
Button right
BTND
BTND
RPA15/RA15
S1_PWM
Button down
Table 5.1. Button connectivity.
All the pins must be defined as digital input: their corresponding TRIS bit must be set to 1, and analog function
must be disabled for pins corresponding to BTNU, BTNL, BTNR, BTND.
TRISBbits.TRISB1 = 1; // RB1 (BTNU) configured as input
ANSELBbits.ANSB1 = 0; // RB1 (BTNU) disabled analog
TRISBbits.TRISB0 = 1; // RB1 (BTNL) configured as input
ANSELBbits.ANSB0 = 0; // RB1 (BTNL) disabled analog
TRISFbits.TRISF4 = 1; // RF0 (BTNC) configured as input
TRISBbits.TRISB8 = 1; // RB8 (BTNR) configured as input
ANSELBbits.ANSB8 = 0; // RB8 (BTNR) disabled analog
TRISAbits.TRISA15 = 1; // RA15 (BTND) configured as input
5.2 Functionality
To read the buttons, the user needs to read the corresponding digital input pin, a value of 1 indicating the button is
pressed or 0 indicating the button is released: