Lawrence Quizon / Mbed OS mini_piano

For MAX32630FTHR Demo Board: Plays piano notes mapped to keyboard keys interfaced through serial port (puTTY or powershell).

Dependencies:   SDFileSystem max32630fthr USBDevice

main.cpp@1:78ca0566c062, 2019-07-16 (annotated)

Committer:
Lugs
Date:
Tue Jul 16 02:07:49 2019 +0000
Revision:
1:78ca0566c062
Parent:
0:ad5ce0aff429
Child:
2:93da96b41127
ver 26,added docu;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Lugs 0:ad5ce0aff429 1 #include "mbed.h"
Lugs 0:ad5ce0aff429 2 #include "max32630fthr.h"
Lugs 0:ad5ce0aff429 3 #include "USBSerial.h"
Lugs 0:ad5ce0aff429 4 #include "stdio.h"
Lugs 0:ad5ce0aff429 5 #include "SDFileSystem.h"
Lugs 0:ad5ce0aff429 6
Lugs 0:ad5ce0aff429 7 //still needs BITS PER SAMPLE PARSING.
Lugs 0:ad5ce0aff429 8 //do this like so: PWM.write(WavValue/2^BPS)
Lugs 0:ad5ce0aff429 9
Lugs 0:ad5ce0aff429 10 #define BUFFER_SIZE 128
Lugs 0:ad5ce0aff429 11 #define HALF_BUFFER 64
Lugs 0:ad5ce0aff429 12
Lugs 0:ad5ce0aff429 13 DigitalOut rLED(LED1);
Lugs 0:ad5ce0aff429 14 DigitalOut gLED(LED2);
Lugs 0:ad5ce0aff429 15 DigitalOut bLED(LED3);
Lugs 0:ad5ce0aff429 16
Lugs 0:ad5ce0aff429 17 DigitalIn Button(P2_3);
Lugs 0:ad5ce0aff429 18
Lugs 0:ad5ce0aff429 19 MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
Lugs 0:ad5ce0aff429 20 PwmOut PWM(P5_6);
Lugs 0:ad5ce0aff429 21 AnalogIn POT(AIN_0);
Lugs 0:ad5ce0aff429 22 volatile int bufferPOS = 0;
Lugs 0:ad5ce0aff429 23 volatile unsigned int g=0;
Lugs 0:ad5ce0aff429 24
Lugs 0:ad5ce0aff429 25 Serial daplink(P2_1,P2_0);
Lugs 0:ad5ce0aff429 26 USBSerial microUSB;
Lugs 0:ad5ce0aff429 27 SDFileSystem sd(P0_5, P0_6, P0_4, P0_7, "sd");
Lugs 0:ad5ce0aff429 28
Lugs 0:ad5ce0aff429 29 float audioDataBuffer[BUFFER_SIZE];
Lugs 0:ad5ce0aff429 30
Lugs 0:ad5ce0aff429 31 struct WavFile
Lugs 0:ad5ce0aff429 32 {
Lugs 0:ad5ce0aff429 33 long int size;
Lugs 0:ad5ce0aff429 34 int channels;
Lugs 0:ad5ce0aff429 35 int sampleRate;
Lugs 0:ad5ce0aff429 36 int bitsPerSample;
Lugs 0:ad5ce0aff429 37 };
Lugs 0:ad5ce0aff429 38
Lugs 0:ad5ce0aff429 39 float potval,reading;
Lugs 0:ad5ce0aff429 40
Lugs 0:ad5ce0aff429 41 void placeNewSample(void)
Lugs 0:ad5ce0aff429 42 {
Lugs 0:ad5ce0aff429 43 PWM.write(audioDataBuffer[bufferPOS++]*!Button); //multiply by POT value for volume.
Lugs 0:ad5ce0aff429 44 bufferPOS = (bufferPOS+1) & 0x07F;
Lugs 0:ad5ce0aff429 45 }
Lugs 0:ad5ce0aff429 46
Lugs 0:ad5ce0aff429 47 int main()
Lugs 0:ad5ce0aff429 48 {
Lugs 0:ad5ce0aff429 49 WavFile Track;
Lugs 0:ad5ce0aff429 50 Ticker SampleTime;
Lugs 0:ad5ce0aff429 51
Lugs 1:78ca0566c062 52 daplink.printf("\f---DAPLINK SERIAL PORT---\r\n\r\nPLAY TONE VER 26 \r\n (CHANGEABLE TONE) MAX FREQUENCY: 1680. \r\n AFTER 1680Hz INPUTS CANNOT BE PROCESSED.\r\n\r\n");
Lugs 0:ad5ce0aff429 53 microUSB.printf("micro USB serial port\r\n");
Lugs 0:ad5ce0aff429 54 rLED = LED_ON;
Lugs 0:ad5ce0aff429 55 wait_ms(500);
Lugs 0:ad5ce0aff429 56 rLED = LED_OFF;
Lugs 0:ad5ce0aff429 57 gLED = LED_ON;
Lugs 0:ad5ce0aff429 58 wait_ms(500);
Lugs 0:ad5ce0aff429 59 bLED = LED_ON;
Lugs 0:ad5ce0aff429 60 gLED = LED_OFF;
Lugs 0:ad5ce0aff429 61
Lugs 0:ad5ce0aff429 62 printf("Generating sine...\r\n");
Lugs 0:ad5ce0aff429 63 int i;
Lugs 0:ad5ce0aff429 64 for(i=0; i<128;i++)
Lugs 0:ad5ce0aff429 65 {
Lugs 0:ad5ce0aff429 66 audioDataBuffer[i] =((1.0 + sin((double(i)/16.0*6.28318530717959)))/2.0); //formula copied from mbed example
Lugs 0:ad5ce0aff429 67 }
Lugs 0:ad5ce0aff429 68
Lugs 0:ad5ce0aff429 69 printf("Playing tone...\r\n");
Lugs 0:ad5ce0aff429 70
Lugs 0:ad5ce0aff429 71 int PlayingFreq = 500;
Lugs 0:ad5ce0aff429 72
Lugs 0:ad5ce0aff429 73 while(1)
Lugs 0:ad5ce0aff429 74 {
Lugs 0:ad5ce0aff429 75
Lugs 0:ad5ce0aff429 76 Track.sampleRate = PlayingFreq * 16; //TONE FREQ = SAMPLE RATE / SAMPLES PER CYCLE
Lugs 0:ad5ce0aff429 77
Lugs 0:ad5ce0aff429 78 PWM.period_us(1); //1MHz
Lugs 0:ad5ce0aff429 79
Lugs 0:ad5ce0aff429 80 float ticker_period = (float) 1/(Track.sampleRate);
Lugs 0:ad5ce0aff429 81
Lugs 0:ad5ce0aff429 82 printf("\r\nTicker Period: %f\tTicker Freq: %f\r\nTarget Freq: %i\r\n\r\n",ticker_period, 1/ticker_period, PlayingFreq);
Lugs 0:ad5ce0aff429 83
Lugs 0:ad5ce0aff429 84 SampleTime.attach(&placeNewSample,ticker_period);
Lugs 0:ad5ce0aff429 85 bLED = LED_OFF;
Lugs 0:ad5ce0aff429 86
Lugs 0:ad5ce0aff429 87 char c;
Lugs 0:ad5ce0aff429 88 char number[10];
Lugs 0:ad5ce0aff429 89 for(i=0;i<10 && c != '\r' && c != '\n'; i++)
Lugs 0:ad5ce0aff429 90 {
Lugs 0:ad5ce0aff429 91 c = daplink.getc();
Lugs 0:ad5ce0aff429 92 number[i] = c;
Lugs 0:ad5ce0aff429 93 }
Lugs 1:78ca0566c062 94
Lugs 0:ad5ce0aff429 95 gLED = LED_ON;
Lugs 0:ad5ce0aff429 96 PlayingFreq = strtol(number,NULL,0);
Lugs 0:ad5ce0aff429 97 gLED = LED_OFF;
Lugs 0:ad5ce0aff429 98 rLED = !rLED;
Lugs 0:ad5ce0aff429 99 SampleTime.detach();
Lugs 0:ad5ce0aff429 100 }
Lugs 0:ad5ce0aff429 101 };
Lugs 0:ad5ce0aff429 102