User manual

Basys MX3™ Board Reference Manual

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val = PORTBbits.RB1; // read BTNU

val = PORTBbits.RB0; // read BTNL

val = PORTFbits.RF0; // read BTNC

val = PORTBbits.RB8; // read BTNR

val = PORTAbits.RA15; // read BTND

Please note that if you want the buttons to trigger a specific functionality, proper software debouncing is required.

Library functions for using the buttons are contained in the Basys MX3 library pack, BTN library; however, the user

can easily use the buttons without the BTN library, as presented above.

5.3 Shared Pins

As shown in the connectivity Table 5.1 above, some pins are shared:

 Buttons BTNL and BTNU share functions with PGD and PGC signals used for programming. Therefore, the

following line should be inserted in the code, to disable their programming function.

#pragma config JTAGEN = OFF

 Buttons BTNR and BTND share the pins with S0_PWM and S1_PWM, explained in Servo headers section,

so these resources should be used exclusively.

 BTNC is shared with TRIG_1 signal in 2x15 Pins Debug Header, so it can be used to trigger events in an

Analog Discovery board experiment.

6 RGB LED

The Basys MX3 board contains one tri-color (RGB) LED. The LED allows the user to obtain any RGB color by

configuring the R, G and B color components.

Figure 6.1. RGB LED schematic diagram.

The usage of the RGB LED is the same as controlling three separate LEDs, one for each color. Figure 6.1 shows the

way the RGB LED is electrically connected on the Basys MX3.