Diff: main.cpp

Revision:

0:ad5ce0aff429

Child:

1:78ca0566c062

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jul 16 02:02:52 2019 +0000
@@ -0,0 +1,101 @@
+#include "mbed.h"
+#include "max32630fthr.h"
+#include "USBSerial.h"
+#include "stdio.h"
+#include "SDFileSystem.h"
+
+//still needs BITS PER SAMPLE PARSING.
+//do this like so: PWM.write(WavValue/2^BPS)
+
+#define BUFFER_SIZE 128
+#define HALF_BUFFER 64
+
+DigitalOut rLED(LED1);
+DigitalOut gLED(LED2);
+DigitalOut bLED(LED3);
+
+DigitalIn Button(P2_3);
+
+MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
+PwmOut PWM(P5_6);
+AnalogIn POT(AIN_0);
+volatile int bufferPOS = 0;
+volatile unsigned int g=0;
+
+Serial daplink(P2_1,P2_0);
+USBSerial microUSB;
+SDFileSystem sd(P0_5, P0_6, P0_4, P0_7, "sd");
+
+float audioDataBuffer[BUFFER_SIZE];
+
+struct WavFile
+{
+    long int size;
+    int channels;
+    int sampleRate;
+    int bitsPerSample;
+};
+
+float potval,reading;
+
+void placeNewSample(void)
+{
+    PWM.write(audioDataBuffer[bufferPOS++]*!Button); //multiply by POT value for volume.
+    bufferPOS = (bufferPOS+1) & 0x07F;
+}
+
+int main()
+{   
+    WavFile Track;
+    Ticker SampleTime;
+    
+    daplink.printf("\f---DAPLINK SERIAL PORT---\r\n\r\nPLAY TONE VER 26 \r\n (CHANGEABLE TONE)\r\n\r\n");
+    microUSB.printf("micro USB serial port\r\n");
+    rLED = LED_ON;
+    wait_ms(500);
+    rLED = LED_OFF;
+    gLED = LED_ON;
+    wait_ms(500);
+    bLED = LED_ON;
+    gLED = LED_OFF;
+    
+    printf("Generating sine...\r\n");
+    int i;
+    for(i=0; i<128;i++)
+    {
+        audioDataBuffer[i] =((1.0 + sin((double(i)/16.0*6.28318530717959)))/2.0); //formula copied from mbed example
+    }
+    
+    printf("Playing tone...\r\n");
+    
+    int PlayingFreq = 500;
+    
+    while(1)
+    {
+    
+        Track.sampleRate = PlayingFreq * 16; //TONE FREQ = SAMPLE RATE / SAMPLES PER CYCLE
+        
+        PWM.period_us(1); //1MHz
+        
+        float ticker_period = (float) 1/(Track.sampleRate);
+        
+        printf("\r\nTicker Period: %f\tTicker Freq: %f\r\nTarget Freq: %i\r\n\r\n",ticker_period, 1/ticker_period, PlayingFreq);
+
+        SampleTime.attach(&placeNewSample,ticker_period);
+        bLED = LED_OFF;
+        
+        char c;
+        char number[10];
+        for(i=0;i<10 && c != '\r' && c != '\n'; i++)
+        {
+               c = daplink.getc();
+               number[i] = c;
+        }
+        gLED = LED_ON;
+        PlayingFreq = strtol(number,NULL,0);
+        gLED = LED_OFF;
+        rLED = !rLED;
+        SampleTime.detach();
+    }
+};
+