MakingMusicWorkshop / Mbed 2 deprecated 4_accelerometer

use an accelerometer to generate sounds

Dependencies:   FXOS8700CQ mbed

main.cpp@0:c482a7d7d833, 2016-05-09 (annotated)

Committer:
maclobdell
Date:
Mon May 09 19:51:02 2016 +0000
Revision:
0:c482a7d7d833
Child:
1:c3cb527a2aa6
initial version - modified from https://github.com/janjongboom/sxsw

Who changed what in which revision?

UserRevisionLine numberNew contents of line
maclobdell 0:c482a7d7d833 1 #include "mbed.h" // this tells us to load mbed related functions
maclobdell 0:c482a7d7d833 2 #include "tones.h" // list of all the tones and their frequencies
maclobdell 0:c482a7d7d833 3 #include "fxos8700cq/fxos8700cq.h" // library for the accelerometer
maclobdell 0:c482a7d7d833 4
maclobdell 0:c482a7d7d833 5 InterruptIn btn2(SW2); // we create a variable 'btn2', use it as an in port
maclobdell 0:c482a7d7d833 6 InterruptIn btn3(SW3); // we create a variable 'btn3', use it as an in port
maclobdell 0:c482a7d7d833 7
maclobdell 0:c482a7d7d833 8 PwmOut buzzer(D3); // our buzzer is a PWM output (pulse-width modulation)
maclobdell 0:c482a7d7d833 9 AnalogIn pad(A0); // connect a pad to the analog input
maclobdell 0:c482a7d7d833 10
maclobdell 0:c482a7d7d833 11 Ticker readTicker;
maclobdell 0:c482a7d7d833 12
maclobdell 0:c482a7d7d833 13 // Set up the accelerometer (this is specific to the onboard one)
maclobdell 0:c482a7d7d833 14 InterruptIn accel_interrupt_pin(PTC13);
maclobdell 0:c482a7d7d833 15 FXOS8700CQ accel(PTE25, PTE24, FXOS8700CQ_SLAVE_ADDR1);
maclobdell 0:c482a7d7d833 16
maclobdell 0:c482a7d7d833 17 static void silence() {
maclobdell 0:c482a7d7d833 18 buzzer.write(0.0f); // silence!
maclobdell 0:c482a7d7d833 19 }
maclobdell 0:c482a7d7d833 20
maclobdell 0:c482a7d7d833 21 // this is our function that plays a tone.
maclobdell 0:c482a7d7d833 22 // Takes in a tone frequency, and after duration (in ms.) we stop playing again
maclobdell 0:c482a7d7d833 23 static void play_tone(int tone) {
maclobdell 0:c482a7d7d833 24 buzzer.period_us(tone);
maclobdell 0:c482a7d7d833 25 buzzer.write(0.10f); // 10% duty cycle, otherwise it's too loud
maclobdell 0:c482a7d7d833 26 }
maclobdell 0:c482a7d7d833 27
maclobdell 0:c482a7d7d833 28 static bool is_pad_high = false;
maclobdell 0:c482a7d7d833 29 static void read_pad() {
maclobdell 0:c482a7d7d833 30 // YOUR CODE HERE (2)
maclobdell 0:c482a7d7d833 31 }
maclobdell 0:c482a7d7d833 32
maclobdell 0:c482a7d7d833 33 static void play_note1() {
maclobdell 0:c482a7d7d833 34 play_tone(NOTE_C4);
maclobdell 0:c482a7d7d833 35 }
maclobdell 0:c482a7d7d833 36 static void play_note2() {
maclobdell 0:c482a7d7d833 37 play_tone(NOTE_D4);
maclobdell 0:c482a7d7d833 38 }
maclobdell 0:c482a7d7d833 39
maclobdell 0:c482a7d7d833 40 // YOUR CODE HERE (1)
maclobdell 0:c482a7d7d833 41
maclobdell 0:c482a7d7d833 42 // this code runs when the microcontroller starts up
maclobdell 0:c482a7d7d833 43 int main() {
maclobdell 0:c482a7d7d833 44 // play note when we fall
maclobdell 0:c482a7d7d833 45 btn2.fall(play_note1);
maclobdell 0:c482a7d7d833 46 btn3.fall(play_note2);
maclobdell 0:c482a7d7d833 47
maclobdell 0:c482a7d7d833 48 // silence when we rise
maclobdell 0:c482a7d7d833 49 btn2.rise(silence);
maclobdell 0:c482a7d7d833 50 btn3.rise(silence);
maclobdell 0:c482a7d7d833 51
maclobdell 0:c482a7d7d833 52 // accelerometer setup
maclobdell 0:c482a7d7d833 53 accel_interrupt_pin.fall(play_note3);
maclobdell 0:c482a7d7d833 54 accel_interrupt_pin.mode(PullUp);
maclobdell 0:c482a7d7d833 55
maclobdell 0:c482a7d7d833 56 accel.config_int(); // enabled interrupts from accelerometer
maclobdell 0:c482a7d7d833 57 accel.config_feature(); // turn on motion detection
maclobdell 0:c482a7d7d833 58 accel.enable(); // enable accelerometer
maclobdell 0:c482a7d7d833 59
maclobdell 0:c482a7d7d833 60 readTicker.attach(&read_pad, 0.03); // the address of the function to be attached (flip) and the interval (in seconds)
maclobdell 0:c482a7d7d833 61
maclobdell 0:c482a7d7d833 62 }