Print a message to a custom LED matrix and play a song on a piezo buzzer.
Dependencies: Adafruit_32x8matrix
Revision 9:d70273b3133b, committed 2021-11-03
- Comitter:
- maclobdell
- Date:
- Wed Nov 03 19:49:24 2021 +0000
- Parent:
- 8:5f5ceafa826d
- Child:
- 10:aa7764fae417
- Commit message:
- initial version
Changed in this revision
main.cpp | Show annotated file Show diff for this revision Revisions of this file |
tones.h | Show annotated file Show diff for this revision Revisions of this file |
--- a/main.cpp Mon Dec 11 19:23:47 2017 +0000 +++ b/main.cpp Wed Nov 03 19:49:24 2021 +0000 @@ -14,7 +14,8 @@ * limitations under the License. */ -#include "mbed.h" +#include "mbed.h" // this tells us to load mbed related functions +#include "tones.h" // list of all the tones and their frequencies #include "Adafruit_32x8matrix.h" @@ -27,16 +28,106 @@ I2C i2c(D14, D15); Adafruit_32x8matrix matrix(&i2c, I2C_ADDR1, I2C_ADDR2, ROTATION1, ROTATION2, BRIGHTNESS); +Thread displayThread; + +PwmOut buzzer(D3); // our buzzer is a PWM output (pulse-width modulation) + +static int BPM = 80; + +static void silence() { + buzzer.write(0.0f); // silence! +} + +// this is our function that plays a tone. +// Takes in a tone frequency, and after duration (in ms.) we stop playing again +static void play_tone(int tone) { + buzzer.period_us(1000000/(tone)); + buzzer.write(0.10f); // 10% duty cycle, otherwise it's too loud +} + +static void play_song(int notes_left, int* melody, int* duration) { + + // melody and duration are pointers, they point to the array of tones and durations we declared earlier + // every time we play a note we up these pointers (move one element forward) + // so the current tone is always the first element of melody (same for duration) + + int length; + + while(notes_left > 0) + { + + int tone = melody[0]; + // BPM is quarter notes per minute, so length in milliseconds is: + length = static_cast<int>(static_cast<float>(1000 / duration[0]) * (60000.0f / static_cast<float>(BPM * 1000))); + + play_tone(tone); + + // after half the length of this tone, we silence + wait_ms(length / 2); + silence(); + + //after the full length of this tone, call next note + wait_ms(length); + + // after the full length of this tone, we up the melody, and down the notes_left + + notes_left--; + melody++; + duration++; + + } + + // we're done! just finish this note and silence + wait_ms(length / 2); + silence(); +} + +void display_thread() +{ + char buffer [50]; + snprintf(buffer, 50, "GO TIGERS!\0"); //pass in max chars to prevent overflow + + for (int i = 0; i< 3; i++) { + matrix.playText(buffer,strlen(buffer), 1); + Thread::wait(250); + } +} int main() { - char buffer [50]; - - while(1) - { - snprintf(buffer, 50, "Hi, how are you today?\0"); //pass in max chars to prevent overflow - matrix.playText(buffer,strlen(buffer), 1); - - Thread::wait(10000); + + + // declare a melody + int melody[] = { + NOTE_G4, NOTE_C5, NOTE_E5, NOTE_G5, NOTE_E5, NOTE_G5 + }; + + // note durations: 4 = quarter note, 8 = eighth note, etc.: + // the rapid succession of 16th notes produces a twill effect + int duration[] = { + 8, 8, 8, 4, 8, 2 + }; + + + // melody & duration are on the heap, need to get them on the stack + int *m = new int[sizeof(melody) / sizeof(int)]; + memcpy(m, melody, sizeof(melody)); + int *d = new int[sizeof(duration) / sizeof(int)]; + memcpy(d, duration, sizeof(duration)); + + + if (sizeof(melody) != sizeof(duration)) { + printf("Melody and duration do not have same number of elements! Aborting!\r\n"); + return 1; } + + for (int i = 0; i< 3; i++) + { + displayThread.start(display_thread); + + play_song(sizeof(melody) / sizeof(int), m, d); + + Thread::wait(100); + } + return 0; }
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tones.h Wed Nov 03 19:49:24 2021 +0000 @@ -0,0 +1,94 @@ +#ifndef SXSW_TONES_H +#define SXSW_TONES_H + +#define NOTE_B0 31 +#define NOTE_C1 33 +#define NOTE_CS1 35 +#define NOTE_D1 37 +#define NOTE_DS1 39 +#define NOTE_E1 41 +#define NOTE_F1 44 +#define NOTE_FS1 46 +#define NOTE_G1 49 +#define NOTE_GS1 52 +#define NOTE_A1 55 +#define NOTE_AS1 58 +#define NOTE_B1 62 +#define NOTE_C2 65 +#define NOTE_CS2 69 +#define NOTE_D2 73 +#define NOTE_DS2 78 +#define NOTE_E2 82 +#define NOTE_F2 87 +#define NOTE_FS2 93 +#define NOTE_G2 98 +#define NOTE_GS2 104 +#define NOTE_A2 110 +#define NOTE_AS2 117 +#define NOTE_B2 123 +#define NOTE_C3 131 +#define NOTE_CS3 139 +#define NOTE_D3 147 +#define NOTE_DS3 156 +#define NOTE_E3 165 +#define NOTE_F3 175 +#define NOTE_FS3 185 +#define NOTE_G3 196 +#define NOTE_GS3 208 +#define NOTE_A3 220 +#define NOTE_AS3 233 +#define NOTE_B3 247 +#define NOTE_C4 262 +#define NOTE_CS4 277 +#define NOTE_D4 294 +#define NOTE_DS4 311 +#define NOTE_E4 330 +#define NOTE_F4 349 +#define NOTE_FS4 370 +#define NOTE_G4 392 +#define NOTE_GS4 415 +#define NOTE_A4 440 +#define NOTE_AS4 466 +#define NOTE_B4 494 +#define NOTE_C5 523 +#define NOTE_CS5 554 +#define NOTE_D5 587 +#define NOTE_DS5 622 +#define NOTE_E5 659 +#define NOTE_F5 698 +#define NOTE_FS5 740 +#define NOTE_G5 784 +#define NOTE_GS5 831 +#define NOTE_A5 880 +#define NOTE_AS5 932 +#define NOTE_B5 988 +#define NOTE_C6 1047 +#define NOTE_CS6 1109 +#define NOTE_D6 1175 +#define NOTE_DS6 1245 +#define NOTE_E6 1319 +#define NOTE_F6 1397 +#define NOTE_FS6 1480 +#define NOTE_G6 1568 +#define NOTE_GS6 1661 +#define NOTE_A6 1760 +#define NOTE_AS6 1865 +#define NOTE_B6 1976 +#define NOTE_C7 2093 +#define NOTE_CS7 2217 +#define NOTE_D7 2349 +#define NOTE_DS7 2489 +#define NOTE_E7 2637 +#define NOTE_F7 2794 +#define NOTE_FS7 2960 +#define NOTE_G7 3136 +#define NOTE_GS7 3322 +#define NOTE_A7 3520 +#define NOTE_AS7 3729 +#define NOTE_B7 3951 +#define NOTE_C8 4186 +#define NOTE_CS8 4435 +#define NOTE_D8 4699 +#define NOTE_DS8 4978 + +#endif