Connectivity; Functionality - Digilent Basys MX3 Reference Manual

Basys MX3™ Board Reference Manual
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

Schematic
Label
Name
BTNU BTNU
BTNL BTNL
BTNC BTNC
BTNR BTNR
BTND BTND
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;
TRISAbits.TRISA15 = 1;
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:
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Figure 5.1. Button schematic diagram.
PIC32 Pin
PGEC1/AN1/RPB1/CTED12/RB1
PGED1/AN0/RPB0/RB0
RPF0/PMD11/RF0
AN8/RPB8/CTED10/RB8
RPA15/RA15
Table 5.1. Button connectivity.
// RB8 (BTNR) disabled analog
// RA15 (BTND) configured as input
Pin Shared
Description
With
PGC Button up
PGD Button left
TRIG_1 Button center
S0_PWM Button right
S1_PWM Button down
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