MakingMusicWorkshop / Mbed 2 deprecated 4_accelerometer

use an accelerometer to generate sounds

Dependencies:   FXOS8700CQ mbed

main.cpp@2:cc285ff20aac, 2016-05-12 (annotated)

Committer:
maclobdell
Date:
Thu May 12 17:34:47 2016 +0000
Revision:
2:cc285ff20aac
Parent:
1:c3cb527a2aa6 
fixed play tone function to not set frequency as the period

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 1:c3cb527a2aa6 3 #include "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
maclobdell 1:c3cb527a2aa6 10 Timeout tone_timeout; //TimeOut = a interrupt to call a function after a specified delay
maclobdell 0:c482a7d7d833 11
maclobdell 0:c482a7d7d833 12 // Set up the accelerometer (this is specific to the onboard one)
maclobdell 0:c482a7d7d833 13 InterruptIn accel_interrupt_pin(PTC13);
maclobdell 0:c482a7d7d833 14 FXOS8700CQ accel(PTE25, PTE24, FXOS8700CQ_SLAVE_ADDR1);
maclobdell 0:c482a7d7d833 15
maclobdell 0:c482a7d7d833 16 static void silence() {
maclobdell 0:c482a7d7d833 17 buzzer.write(0.0f); // silence!
maclobdell 0:c482a7d7d833 18 }
maclobdell 0:c482a7d7d833 19
maclobdell 0:c482a7d7d833 20 // this is our function that plays a tone.
maclobdell 0:c482a7d7d833 21 // Takes in a tone frequency, and after duration (in ms.) we stop playing again
maclobdell 0:c482a7d7d833 22 static void play_tone(int tone) {
maclobdell 2:cc285ff20aac 23 buzzer.period_us(1000000/(tone));
maclobdell 0:c482a7d7d833 24 buzzer.write(0.10f); // 10% duty cycle, otherwise it's too loud
maclobdell 0:c482a7d7d833 25 }
maclobdell 0:c482a7d7d833 26
maclobdell 0:c482a7d7d833 27 static void play_note1() {
maclobdell 0:c482a7d7d833 28 play_tone(NOTE_C4);
maclobdell 0:c482a7d7d833 29 }
maclobdell 0:c482a7d7d833 30 static void play_note2() {
maclobdell 0:c482a7d7d833 31 play_tone(NOTE_D4);
maclobdell 0:c482a7d7d833 32 }
maclobdell 0:c482a7d7d833 33
maclobdell 1:c3cb527a2aa6 34 // YOUR CODE HERE
maclobdell 0:c482a7d7d833 35
maclobdell 0:c482a7d7d833 36 // this code runs when the microcontroller starts up
maclobdell 0:c482a7d7d833 37 int main() {
maclobdell 0:c482a7d7d833 38 // play note when we fall
maclobdell 0:c482a7d7d833 39 btn2.fall(play_note1);
maclobdell 0:c482a7d7d833 40 btn3.fall(play_note2);
maclobdell 0:c482a7d7d833 41
maclobdell 0:c482a7d7d833 42 // silence when we rise
maclobdell 0:c482a7d7d833 43 btn2.rise(silence);
maclobdell 0:c482a7d7d833 44 btn3.rise(silence);
maclobdell 0:c482a7d7d833 45
maclobdell 0:c482a7d7d833 46 // accelerometer setup
maclobdell 0:c482a7d7d833 47 accel_interrupt_pin.fall(play_note3);
maclobdell 0:c482a7d7d833 48 accel_interrupt_pin.mode(PullUp);
maclobdell 0:c482a7d7d833 49
maclobdell 0:c482a7d7d833 50 accel.config_int(); // enabled interrupts from accelerometer
maclobdell 0:c482a7d7d833 51 accel.config_feature(); // turn on motion detection
maclobdell 0:c482a7d7d833 52 accel.enable(); // enable accelerometer
maclobdell 0:c482a7d7d833 53
maclobdell 0:c482a7d7d833 54 }