UM0501

Demonstration applications

Doc ID 14320 Rev 3

13/23

2.8

PWM demo 1

This mode demonstrates the Timer peripheral operating in PWM mode. Make sure that the

JP14 jumper is installed in the bottom position (closer to the LCD).

1.

Entering the melody (see Figure 11):

The first LCD line shows the position of the note to enter.

o = Edit mode, the note is selected by using the RV1 potentiometer.

x = Protect mode, the note cannot be changed.

The second LCD line shows the notes to be played with the following convention:

a/A = LA

b/B = SI

c/C = DO

d/D = RE

e/E = MI

f/F = FA

g/G = SOL

s/S = silence or pause

A lowercase letter represent a brief note, and an uppercase letter a long note.

To modify a note, press the joystick LEFT or RIGHT to navigate the notes, and use the

RV1 potentiometer. Then press SEL to confirm.

Once all the notes have been defined, enter an end mark to play the melody.

8 = End of melody, the melody is played in a loop with varying octaves and note

durations.

Figure 11.

Defining the melody to be played

2.

Playing and saving the melody

●

Press SEL on the joystick to play the tune indefinitely.

●

Press the joystick UP to stop the melody.

Note:

Keep the joystick pressed UP for a short time to allow the action to be taken into account.

●

The second time UP is pressed, a message is displayed asking you whether you want

to save the melody or not (see Figure 12).

a)

If you press the KEY button, the melody is saved in the external EEPROM.

b)

If you press UP on the joystick, you exit from the demo without saving the melody.

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