Hello,
I have been trying to figure out how to change my recordings filename saved on the SD card each time it resets instead of overwriting.
It doesn't need to be the date or anything. Just something sequential, i.e. recording1.wav, recording 2.wav and so on.
I have been trying to do this for days and being new to Arduino it is slightly tricky to get my head around things.
Below is the unedited code. The naming happens about half way through.
// Include libraries
#include <SdFat.h>
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
// SD card objects
SdFat sd;
SdFile rec;
// Constants
const int chipSelect = 10;
unsigned long fileSize = 0L;
unsigned long waveChunk = 16;
unsigned int waveType = 1;
unsigned int numChannels = 1;
unsigned long sampleRate = 22050;
unsigned long bytesPerSec = 22050;
unsigned int blockAlign = 1;
unsigned int bitsPerSample = 8;
unsigned long dataSize = 0L;
unsigned long recByteCount = 0L;
unsigned long recByteSaved = 0L;
const int ledStart = 7;
int recPressed = 0;
int stopPressed = 0;
unsigned long oldTime = 0L;
unsigned long newTime = 0L;
// Buffers
byte buf00[512]; // buffer array 1
byte buf01[512]; // buffer array 2
byte byte1, byte2, byte3, byte4;
unsigned int bufByteCount;
byte bufWrite;
// Counter
byte recordingEnded = false;
unsigned int counter;
unsigned int initial_count;
unsigned int maxCount = 5 * 1000; // 5 Seconds
void setup() { // THIS RUNS ONCE
// Setup timer & ADC
Setup_timer2();
Setup_ADC();
// Set output pins
pinMode(10, OUTPUT);
pinMode(ledStart, OUTPUT);
// Init SD card
if (sd.begin(chipSelect, SPI_FULL_SPEED)) {
for (int dloop = 0; dloop < 4; dloop++) {
digitalWrite(ledStart,!digitalRead(ledStart));
delay(100);
}
}
// If error
else {
while(1) {
digitalWrite(ledStart,!digitalRead(ledStart));
delay(500);
}
}
// Start recording
StartRec();
// Init counter
initial_count = millis();
}
void loop() { // THIS RUNS LOTS!
// Update counter
counter = millis() - initial_count;
// Stop recording if counter reached
if (counter > maxCount && !recordingEnded) {
recordingEnded = true;
StopRec();
}
// Update recording
if (recByteCount % 1024 == 512 && recPressed == 1) { rec.write(buf00,512); recByteSaved+= 512; } // save buf01 to card
if (recByteCount % 1024 == 0 && recPressed == 1) { rec.write(buf01,512); recByteSaved+= 512; } // save buf02 to card
}
void StartRec() { // begin recording process
digitalWrite(ledStart,HIGH);
recByteCount = 0;
recByteSaved = 0;
recPressed = 1; // recording button has been pressed
stopPressed = 0;
writeWavHeader();
sbi (TIMSK2, OCIE2A); // enable timer interrupt, start grabbing audio
}
void StopRec() { // stop recording process, update WAV header, close file
cbi (TIMSK2, OCIE2A); // disable timer interrupt
writeOutHeader();
digitalWrite(ledStart,LOW); // turn off recording LED
recPressed = 0;
}
void writeOutHeader() { // update WAV header with final filesize/datasize
rec.seekSet(4);
byte1 = recByteSaved & 0xff;
byte2 = (recByteSaved >> 8) & 0xff;
byte3 = (recByteSaved >> 16) & 0xff;
byte4 = (recByteSaved >> 24) & 0xff;
rec.write(byte1); rec.write(byte2); rec.write(byte3); rec.write(byte4);
rec.seekSet(40);
rec.write(byte1); rec.write(byte2); rec.write(byte3); rec.write(byte4);
rec.close();
}
void writeWavHeader() { // write out original WAV header to file
recByteSaved = 0;
rec.open("PLEASECHANGEME.wav", O_CREAT | O_TRUNC | O_RDWR);
rec.write("RIFF");
byte1 = fileSize & 0xff;
byte2 = (fileSize >> 8) & 0xff;
byte3 = (fileSize >> 16) & 0xff;
byte4 = (fileSize >> 24) & 0xff;
rec.write(byte1); rec.write(byte2); rec.write(byte3); rec.write(byte4);
rec.write("WAVE");
rec.write("fmt ");
byte1 = waveChunk & 0xff;
byte2 = (waveChunk >> 8) & 0xff;
byte3 = (waveChunk >> 16) & 0xff;
byte4 = (waveChunk >> 24) & 0xff;
rec.write(byte1); rec.write(byte2); rec.write(byte3); rec.write(byte4);
byte1 = waveType & 0xff;
byte2 = (waveType >> 8) & 0xff;
rec.write(byte1); rec.write(byte2);
byte1 = numChannels & 0xff;
byte2 = (numChannels >> 8) & 0xff;
rec.write(byte1); rec.write(byte2);
byte1 = sampleRate & 0xff;
byte2 = (sampleRate >> 8) & 0xff;
byte3 = (sampleRate >> 16) & 0xff;
byte4 = (sampleRate >> 24) & 0xff;
rec.write(byte1); rec.write(byte2); rec.write(byte3); rec.write(byte4);
byte1 = bytesPerSec & 0xff;
byte2 = (bytesPerSec >> 8) & 0xff;
byte3 = (bytesPerSec >> 16) & 0xff;
byte4 = (bytesPerSec >> 24) & 0xff;
rec.write(byte1); rec.write(byte2); rec.write(byte3); rec.write(byte4);
byte1 = blockAlign & 0xff;
byte2 = (blockAlign >> 8) & 0xff;
rec.write(byte1); rec.write(byte2);
byte1 = bitsPerSample & 0xff;
byte2 = (bitsPerSample >> 8) & 0xff;
rec.write(byte1); rec.write(byte2);
rec.write("data");
byte1 = dataSize & 0xff;
byte2 = (dataSize >> 8) & 0xff;
byte3 = (dataSize >> 16) & 0xff;
byte4 = (dataSize >> 24) & 0xff;
rec.write(byte1); rec.write(byte2); rec.write(byte3); rec.write(byte4);
}
void Setup_timer2() {
TCCR2B = _BV(CS21); // Timer2 Clock Prescaler to : 8
TCCR2A = _BV(WGM21); // Interupt frequency = 16MHz / (8 x 90 + 1) = 22191Hz
OCR2A = 90; // Compare Match register set to 90
}
void Setup_ADC() {
ADMUX = 0x65; // set ADC to read pin A5, ADLAR to 1 (left adjust)
cbi(ADCSRA,ADPS2); // set prescaler to 8 / ADC clock = 2MHz
sbi(ADCSRA,ADPS1);
sbi(ADCSRA,ADPS0);
}
ISR(TIMER2_COMPA_vect) {
sbi(ADCSRA, ADSC); // start ADC sample
while(bit_is_set(ADCSRA, ADSC)); // wait until ADSC bit goes low = new sample ready
recByteCount++; // increment sample counter
bufByteCount++;
if (bufByteCount == 512 && bufWrite == 0) {
bufByteCount = 0;
bufWrite = 1;
} else if (bufByteCount == 512 & bufWrite == 1) {
bufByteCount = 0;
bufWrite = 0;
}
if (bufWrite == 0) { buf00[bufByteCount] = ADCH; }
if (bufWrite == 1) { buf01[bufByteCount] = ADCH; }
// if (recByteCount % 1024 < 512) { // determine which buffer to store sample into
// buf01[recByteCount % 512] = ADCH;
// } else {
// buf02[recByteCount % 512] = ADCH;
// }
}