{"id":1447,"date":"2024-06-26T13:22:20","date_gmt":"2024-06-26T18:22:20","guid":{"rendered":"https:\/\/www.ken-beck.com\/words\/?p=1447"},"modified":"2024-06-26T13:42:18","modified_gmt":"2024-06-26T18:42:18","slug":"coding-with-chatgpt","status":"publish","type":"post","link":"https:\/\/www.ken-beck.com\/words\/2024\/06\/coding-with-chatgpt\/","title":{"rendered":"Coding with ChatGPT!"},"content":{"rendered":"\n

I’ve been working on code for a couple of Teensy Micro Controllers. One board records. The other plays back.<\/p>\n\n\n\n

I’m very close to having the desired functionality. But I’m getting down to some tweaks. I’ve been going back and forth with ChatGPT during the whole process. Here’s an example exchange.<\/p>\n\n\n

\n
\"\"
Player, Teensy 4.0… Photobombed by Mortimer<\/figcaption><\/figure>\n<\/div>\n\n
\n
\"\"
Recorder, Teensy 4.<\/figcaption><\/figure>\n<\/div>\n\n\n

Me: Works great. can the record LED respond to peaks instead of just be on when recording?<\/p>\n\n\n\n

ChatGPT:<\/p>\n\n\n\n

Sure, you can modify the code so that the recording LED (LED_PIN_1) responds to audio peaks instead of just staying on when recording. This can be done by analyzing the audio buffer data for peaks and toggling the LED accordingly.<\/p>\n\n\n\n

cppCopy code#include <Audio.h>\n#include <Wire.h>\n#include <SPI.h>\n#include <SD.h>\n#include <SerialFlash.h>\n#include <Bounce.h>\n\n\/\/ GUItool: begin automatically generated code\nAudioInputI2S            i2s1;           \/\/xy=168,145\nAudioRecordQueue         queue1;         \/\/xy=360,62\nAudioRecordQueue         queue2;         \/\/xy=389,145\nAudioConnection          patchCord1(i2s1, 0, queue1, 0);\nAudioConnection          patchCord2(i2s1, 1, queue2, 0);\nAudioControlSGTL5000     sgtl5000_1;     \/\/xy=265,212\n\/\/ GUItool: end automatically generated code\n\n\/\/ Use these with the Teensy Audio Shield\n#define SDCARD_CS_PIN    BUILTIN_SDCARD\n#define SDCARD_MOSI_PIN  11  \/\/ not actually used\n#define SDCARD_SCK_PIN   13  \/\/ not actually used\n\n#define LED_PIN_1 9  \/\/ LED indicating recording state\n#define LED_PIN_2 5  \/\/ LED indicating standby state (flashing)\n\n\/\/ Define the button pins\n#define BUTTON_RECORD 0\n#define BUTTON_STOP 1\n#define BUTTON_INCREMENT 2\n#define BUTTON_ERASE 3\n\n\/\/ Define the toggle switch pin\n#define TOGGLE_SWITCH_PIN 4\n\nBounce button0 = Bounce(BUTTON_RECORD, 15);  \/\/ Record\nBounce button1 = Bounce(BUTTON_STOP, 15);    \/\/ Stop\nBounce button2 = Bounce(BUTTON_INCREMENT, 15);  \/\/ Increment file name\nBounce button3 = Bounce(BUTTON_ERASE, 15);   \/\/ Erase\nBounce toggleSwitch = Bounce(TOGGLE_SWITCH_PIN, 15); \/\/ Toggle switch\n\n\/\/ Remember which mode we're doing\nint mode = 0;  \/\/ 0=stopped, 1=recording\n\n\/\/ The file where data is recorded\nFile frec;\nint fileNumber = 1;  \/\/ Start with RECORD1.WAV\n\nelapsedMillis blinkTime;\n\nvoid setup() {\n  Serial.begin(9600);\n  \n  \/\/ record queue uses this memory to buffer incoming audio.\n  AudioMemory(120);\n\n  \/\/ Enable the audio shield, select input, and enable output\n  sgtl5000_1.enable();\n  sgtl5000_1.inputSelect(AUDIO_INPUT_LINEIN);\n  sgtl5000_1.volume(0.5);\n\n  \/\/ Configure headphone and lineout settings\n  sgtl5000_1.lineOutLevel(13);  \/\/ Adjust line out level if needed\n  sgtl5000_1.dacVolume(0.5, 0.5); \/\/ Set initial DAC volumes\n  sgtl5000_1.headphoneSelect(AUDIO_HEADPHONE_DAC); \/\/ headphones monitor DAC output\n\n  \/\/ Initialize the SD card\n  SPI.setMOSI(SDCARD_MOSI_PIN);\n  SPI.setSCK(SDCARD_SCK_PIN);\n  if (!(SD.begin(SDCARD_CS_PIN))) {\n    \/\/ stop here if no SD card, but print a message\n    while (1) {\n      Serial.println(\"Unable to access the SD card\");\n      delay(500);\n    }\n  }\n  \n  pinMode(LED_PIN_1, OUTPUT);\n  pinMode(LED_PIN_2, OUTPUT);\n  pinMode(BUTTON_RECORD, INPUT_PULLUP);\n  pinMode(BUTTON_STOP, INPUT_PULLUP);\n  pinMode(BUTTON_INCREMENT, INPUT_PULLUP);\n  pinMode(BUTTON_ERASE, INPUT_PULLUP);\n  pinMode(TOGGLE_SWITCH_PIN, INPUT_PULLUP); \/\/ Toggle switch for input selection\n\n  digitalWrite(LED_PIN_2, HIGH);  \/\/ Turn on standby LED\n\n  delay(1000);\n}\n\nvoid loop() {\n  button0.update();\n  button1.update();\n  button2.update();\n  button3.update();\n  toggleSwitch.update(); \/\/ Update the toggle switch state\n\n  if (button0.fallingEdge()) {\n    startRecording();\n  }\n  \n  if (button1.fallingEdge()) {\n    stopAll();\n  }\n  \n  if (button2.fallingEdge()) {\n    incrementFileName();\n  }\n\n  if (button3.fallingEdge()) {\n    eraseWavRecordings();\n  }\n  if (mode == 1) {\n    continueRecording();\n  } else {\n    \/\/ Blink LED_PIN_2 to indicate standby mode\n    if (blinkTime >= 500) {\n      digitalWrite(LED_PIN_2, !digitalRead(LED_PIN_2)); \/\/ Toggle LED state\n      blinkTime = 0; \/\/ Reset blink timer\n    }\n  }\n\n  \/\/ Check the toggle switch to select the input\n  if (toggleSwitch.fallingEdge() || toggleSwitch.risingEdge()) {\n    if (digitalRead(TOGGLE_SWITCH_PIN) == LOW) {\n      sgtl5000_1.inputSelect(AUDIO_INPUT_MIC);\n      Serial.println(\"Switched to MIC input\");\n    } else {\n      sgtl5000_1.inputSelect(AUDIO_INPUT_LINEIN);\n      Serial.println(\"Switched to LINE input\");\n    }\n  }\n\n  \/\/ Update volumes\n  float recordVolume = analogRead(A0) \/ 1023.0;\n  float headphoneVolume = analogRead(A2) \/ 1023.0;\n  \/\/ Serial.print(\"Record Volume: \"); Serial.println(recordVolume);\n  \/\/ Serial.print(\"Headphone Volume: \"); Serial.println(headphoneVolume);\n  sgtl5000_1.lineInLevel(recordVolume * 15); \/\/ scale to appropriate range (0-15)\n  sgtl5000_1.volume(headphoneVolume); \/\/ scale to appropriate range (0-1)\n  sgtl5000_1.dacVolume(headphoneVolume, headphoneVolume); \/\/ update DAC volumes\n\n  \/\/ Update mic gain if MIC input is selected\n  if (digitalRead(TOGGLE_SWITCH_PIN) == LOW) {\n    float micGain = analogRead(A1) \/ 1023.0 * 63.0; \/\/ scale to appropriate range (0-63)\n    sgtl5000_1.micGain(micGain);\n  }\n}\n\nvoid startRecording() {\n  Serial.println(\"StartRecording\");\n  char fileName[13];\n  snprintf(fileName, sizeof(fileName), \"RECORD%d.WAV\", fileNumber);\n  if (SD.exists(fileName)) {\n    SD.remove(fileName);\n  }\n  frec = SD.open(fileName, FILE_WRITE);\n  if (frec) {\n    Serial.print(\"File Open: \");\n    Serial.println(fileName);\n\n    \/\/ Reserve space for the header\n    frec.seek(44);\n\n    queue1.begin();\n    queue2.begin();\n    mode = 1;\n    digitalWrite(LED_PIN_1, HIGH);  \/\/ Turn on recording LED\n    digitalWrite(LED_PIN_2, LOW);   \/\/ Turn off standby LED\n  }\n}\n\nvoid continueRecording() {\n  if (queue1.available() >= 2 && queue2.available() >= 2) {\n    byte buffer[512];\n    byte bufferL[256];\n    byte bufferR[256];\n    memcpy(bufferL, queue1.readBuffer(), 256);\n    memcpy(bufferR, queue2.readBuffer(), 256);\n    queue1.freeBuffer();\n    queue2.freeBuffer();\n    int b = 0;\n    int peakL = 0;  \/\/ To store peak value of left channel\n    int peakR = 0;  \/\/ To store peak value of right channel\n    for (int i = 0; i < 512; i += 4) {\n      buffer[i] = bufferL[b];\n      buffer[i + 1] = bufferL[b + 1];\n      buffer[i + 2] = bufferR[b];\n      buffer[i + 3] = bufferR[b + 1];\n      b += 2;\n\n      \/\/ Check for peak values\n      int16_t valL = (bufferL[b + 1] << 8) | bufferL[b];\n      int16_t valR = (bufferR[b + 1] << 8) | bufferR[b];\n      if (abs(valL) > peakL) peakL = abs(valL);\n      if (abs(valR) > peakR) peakR = abs(valR);\n    }\n    frec.write(buffer, 512);\n\n    \/\/ Adjust LED based on peak values\n    if (peakL > 5000 || peakR > 5000) {\n      digitalWrite(LED_PIN_1, HIGH);  \/\/ Turn on recording LED if peak is detected\n    } else {\n      digitalWrite(LED_PIN_1, LOW);   \/\/ Turn off recording LED if no peak\n    }\n  }\n}\n\nvoid stopRecording() {\n  Serial.println(\"StopRecording\");\n  queue1.end();\n  queue2.end();\n  \/\/ flush buffer\n  while (queue1.available() > 0 && queue2.available() > 0) {\n    queue1.readBuffer();\n    queue1.freeBuffer();\n    queue2.readBuffer();\n    queue2.freeBuffer();\n  }\n  uint32_t dataSize = frec.size() - 44;\n  frec.seek(0);\n  writeWavHeader(frec, 44100, 16, 2, dataSize);\n  frec.close();\n  mode = 0;\n  digitalWrite(LED_PIN_1, LOW);  \/\/ Turn off recording LED\n  digitalWrite(LED_PIN_2, HIGH); \/\/ Turn on standby LED\n}\n\nvoid stopAll() {\n  if (mode == 1) {\n    stopRecording();\n  }\n  Serial.println(\"StopAll\");\n}\n\nvoid incrementFileName() {\n  fileNumber++;\n  Serial.print(\"Incrementing file number to: \");\n  Serial.println(fileNumber);\n}\n\nvoid eraseWavRecordings() {\n  \/\/ Open the root directory\n  File root = SD.open(\"\/\");\n  \n  \/\/ Delete all .WAV files\n  deleteWavFiles(root);\n\n  \/\/ Close the root directory\n  root.close();\n\n  Serial.println(\"All .WAV recordings erased\");\n}\n\nvoid deleteWavFiles(File dir) {\n  while (true) {\n    File entry = dir.openNextFile();\n    if (!entry) {\n      \/\/ No more files\n      break;\n    }\n    if (entry.isDirectory()) {\n      deleteWavFiles(entry);  \/\/ Recursively delete directory contents\n    } else {\n      String fileName = entry.name();\n      if (fileName.endsWith(\".WAV\")) {\n        SD.remove(entry.name()); \/\/ Delete the file\n        Serial.print(\"Deleted: \");\n        Serial.println(fileName);\n      }\n    }\n    entry.close();\n  }\n}\n\nvoid writeWavHeader(File& file, uint32_t sampleRate, uint16_t bitsPerSample, uint16_t channels, uint32_t dataSize) {\n  uint32_t byteRate = sampleRate * channels * (bitsPerSample \/ 8);\n  uint16_t blockAlign = channels * (bitsPerSample \/ 8);\n\n  file.write(\"RIFF\");\n  file.write((dataSize + 36) & 0xff);\n  file.write(((dataSize + 36) >> 8) & 0xff);\n  file.write(((dataSize + 36) >> 16) & 0xff);\n  file.write(((dataSize + 36) >> 24) & 0xff);\n  file.write(\"WAVE\");\n  file.write(\"fmt \");\n  file.write(16 & 0xff);\n  file.write((16 >> 8) & 0xff);\n  file.write((16 >> 16) & 0xff);\n  file.write((16 >> 24) & 0xff);\n  file.write(1 & 0xff);\n  file.write((1 >> 8) & 0xff);\n  file.write(channels & 0xff);\n  file.write((channels >> 8) & 0xff);\n  file.write(sampleRate & 0xff);\n  file.write((sampleRate >> 8) & 0xff);\n  file.write((sampleRate >> 16) & 0xff);\n  file.write((sampleRate >> 24) & 0xff);\n  file.write(byteRate & 0xff);\n  file.write((byteRate >> 8) & 0xff);\n  file.write((byteRate >> 16) & 0xff);\n  file.write((byteRate >> 24) & 0xff);\n  file.write(blockAlign & 0xff);\n  file.write((blockAlign >> 8) & 0xff);\n  file.write(bitsPerSample & 0xff);\n  file.write((bitsPerSample >> 8) & 0xff);\n  file.write(\"data\");\n  file.write(dataSize & 0xff);\n  file.write((dataSize >> 8) & 0xff);\n  file.write((dataSize >> 16) & 0xff);\n  file.write((dataSize >> 24) & 0xff);\n}\n<\/code><\/pre>\n\n\n\n
Here’s a modified version of your code to achieve this:<\/p>\n\n\n\n
Changes made:<\/h3>\n\n\n\n
    \n
  1. Modified continueRecording<\/code> function<\/strong>: Added peak detection by analyzing the buffer data.<\/li>\n\n\n\n
  2. Updated LED control<\/strong>: Turn the LED on if a peak is detected and off if no peak is found.<\/li>\n<\/ol>\n\n\n\n
    This will make the recording LED respond to audio peaks, creating a visual indication of the audio levels being recorded.<\/p>\n\n\n\n
    Me:<\/p>\n\n\n\n
    gives this error message: \/Users\/kenbeck\/Documents\/Arduino\/Teensy41_WAV-recorder_PeakReadingLED\/Teensy41_WAV-recorder_PeakReadingLED.ino: In function ‘void continueRecording()’: \/Users\/kenbeck\/Documents\/Arduino\/Teensy41_WAV-recorder_PeakReadingLED\/Teensy41_WAV-recorder_PeakReadingLED.ino:191:36: warning: iteration 127 invokes undefined behavior [-Waggressive-loop-optimizations] 191 | int16_t valL = (bufferL[b + 1] << 8) | bufferL[b]; | ~~~~~~~~~~~~~^ \/Users\/kenbeck\/Documents\/Arduino\/Teensy41_WAV-recorder_PeakReadingLED\/Teensy41_WAV-recorder_PeakReadingLED.ino:183:23: note: within this loop 183 | for (int i = 0; i < 512; i += 4) { | ~~^~~~~<\/p>\n\n\n\n
    ChatGPT:<\/p>\n\n\n\n
    The error message you’re seeing indicates a problem with accessing out-of-bounds elements in the arrays bufferL<\/code> and bufferR<\/code>. This typically happens at the last iteration of the loop when b<\/code> is incremented beyond the valid index range for the arrays.<\/p>\n\n\n\n
    Here’s the corrected code to ensure the array bounds are not violated:<\/p>\n\n\n\n
    cppCopy code#include <Audio.h>\n#include <Wire.h>\n#include <SPI.h>\n#include <SD.h>\n#include <SerialFlash.h>\n#include <Bounce.h>\n\n\/\/ GUItool: begin automatically generated code\nAudioInputI2S            i2s1;           \/\/xy=168,145\nAudioRecordQueue         queue1;         \/\/xy=360,62\nAudioRecordQueue         queue2;         \/\/xy=389,145\nAudioConnection          patchCord1(i2s1, 0, queue1, 0);\nAudioConnection          patchCord2(i2s1, 1, queue2, 0);\nAudioControlSGTL5000     sgtl5000_1;     \/\/xy=265,212\n\/\/ GUItool: end automatically generated code\n\n\/\/ Use these with the Teensy Audio Shield\n#define SDCARD_CS_PIN    BUILTIN_SDCARD\n#define SDCARD_MOSI_PIN  11  \/\/ not actually used\n#define SDCARD_SCK_PIN   13  \/\/ not actually used\n\n#define LED_PIN_1 9  \/\/ LED indicating recording state\n#define LED_PIN_2 5  \/\/ LED indicating standby state (flashing)\n\n\/\/ Define the button pins\n#define BUTTON_RECORD 0\n#define BUTTON_STOP 1\n#define BUTTON_INCREMENT 2\n#define BUTTON_ERASE 3\n\n\/\/ Define the toggle switch pin\n#define TOGGLE_SWITCH_PIN 4\n\nBounce button0 = Bounce(BUTTON_RECORD, 15);  \/\/ Record\nBounce button1 = Bounce(BUTTON_STOP, 15);    \/\/ Stop\nBounce button2 = Bounce(BUTTON_INCREMENT, 15);  \/\/ Increment file name\nBounce button3 = Bounce(BUTTON_ERASE, 15);   \/\/ Erase\nBounce toggleSwitch = Bounce(TOGGLE_SWITCH_PIN, 15); \/\/ Toggle switch\n\n\/\/ Remember which mode we're doing\nint mode = 0;  \/\/ 0=stopped, 1=recording\n\n\/\/ The file where data is recorded\nFile frec;\nint fileNumber = 1;  \/\/ Start with RECORD1.WAV\n\nelapsedMillis blinkTime;\n\nvoid setup() {\n  Serial.begin(9600);\n  \n  \/\/ record queue uses this memory to buffer incoming audio.\n  AudioMemory(120);\n\n  \/\/ Enable the audio shield, select input, and enable output\n  sgtl5000_1.enable();\n  sgtl5000_1.inputSelect(AUDIO_INPUT_LINEIN);\n  sgtl5000_1.volume(0.5);\n\n  \/\/ Configure headphone and lineout settings\n  sgtl5000_1.lineOutLevel(13);  \/\/ Adjust line out level if needed\n  sgtl5000_1.dacVolume(0.5, 0.5); \/\/ Set initial DAC volumes\n  sgtl5000_1.headphoneSelect(AUDIO_HEADPHONE_DAC); \/\/ headphones monitor DAC output\n\n  \/\/ Initialize the SD card\n  SPI.setMOSI(SDCARD_MOSI_PIN);\n  SPI.setSCK(SDCARD_SCK_PIN);\n  if (!(SD.begin(SDCARD_CS_PIN))) {\n    \/\/ stop here if no SD card, but print a message\n    while (1) {\n      Serial.println(\"Unable to access the SD card\");\n      delay(500);\n    }\n  }\n  \n  pinMode(LED_PIN_1, OUTPUT);\n  pinMode(LED_PIN_2, OUTPUT);\n  pinMode(BUTTON_RECORD, INPUT_PULLUP);\n  pinMode(BUTTON_STOP, INPUT_PULLUP);\n  pinMode(BUTTON_INCREMENT, INPUT_PULLUP);\n  pinMode(BUTTON_ERASE, INPUT_PULLUP);\n  pinMode(TOGGLE_SWITCH_PIN, INPUT_PULLUP); \/\/ Toggle switch for input selection\n\n  digitalWrite(LED_PIN_2, HIGH);  \/\/ Turn on standby LED\n\n  delay(1000);\n}\n\nvoid loop() {\n  button0.update();\n  button1.update();\n  button2.update();\n  button3.update();\n  toggleSwitch.update(); \/\/ Update the toggle switch state\n\n  if (button0.fallingEdge()) {\n    startRecording();\n  }\n  \n  if (button1.fallingEdge()) {\n    stopAll();\n  }\n  \n  if (button2.fallingEdge()) {\n    incrementFileName();\n  }\n\n  if (button3.fallingEdge()) {\n    eraseWavRecordings();\n  }\n  if (mode == 1) {\n    continueRecording();\n  } else {\n    \/\/ Blink LED_PIN_2 to indicate standby mode\n    if (blinkTime >= 500) {\n      digitalWrite(LED_PIN_2, !digitalRead(LED_PIN_2)); \/\/ Toggle LED state\n      blinkTime = 0; \/\/ Reset blink timer\n    }\n  }\n\n  \/\/ Check the toggle switch to select the input\n  if (toggleSwitch.fallingEdge() || toggleSwitch.risingEdge()) {\n    if (digitalRead(TOGGLE_SWITCH_PIN) == LOW) {\n      sgtl5000_1.inputSelect(AUDIO_INPUT_MIC);\n      Serial.println(\"Switched to MIC input\");\n    } else {\n      sgtl5000_1.inputSelect(AUDIO_INPUT_LINEIN);\n      Serial.println(\"Switched to LINE input\");\n    }\n  }\n\n  \/\/ Update volumes\n  float recordVolume = analogRead(A0) \/ 1023.0;\n  float headphoneVolume = analogRead(A2) \/ 1023.0;\n  \/\/ Serial.print(\"Record Volume: \"); Serial.println(recordVolume);\n  \/\/ Serial.print(\"Headphone Volume: \"); Serial.println(headphoneVolume);\n  sgtl5000_1.lineInLevel(recordVolume * 15); \/\/ scale to appropriate range (0-15)\n  sgtl5000_1.volume(headphoneVolume); \/\/ scale to appropriate range (0-1)\n  sgtl5000_1.dacVolume(headphoneVolume, headphoneVolume); \/\/ update DAC volumes\n\n  \/\/ Update mic gain if MIC input is selected\n  if (digitalRead(TOGGLE_SWITCH_PIN) == LOW) {\n    float micGain = analogRead(A1) \/ 1023.0 * 63.0; \/\/ scale to appropriate range (0-63)\n    sgtl5000_1.micGain(micGain);\n  }\n}\n\nvoid startRecording() {\n  Serial.println(\"StartRecording\");\n  char fileName[13];\n  snprintf(fileName, sizeof(fileName), \"RECORD%d.WAV\", fileNumber);\n  if (SD.exists(fileName)) {\n    SD.remove(fileName);\n  }\n  frec = SD.open(fileName, FILE_WRITE);\n  if (frec) {\n    Serial.print(\"File Open: \");\n    Serial.println(fileName);\n\n    \/\/ Reserve space for the header\n    frec.seek(44);\n\n    queue1.begin();\n    queue2.begin();\n    mode = 1;\n    digitalWrite(LED_PIN_1, HIGH);  \/\/ Turn on recording LED\n    digitalWrite(LED_PIN_2, LOW);   \/\/ Turn off standby LED\n  }\n}\n\nvoid continueRecording() {\n  if (queue1.available() >= 2 && queue2.available() >= 2) {\n    byte buffer[512];\n    byte bufferL[256];\n    byte bufferR[256];\n    memcpy(bufferL, queue1.readBuffer(), 256);\n    memcpy(bufferR, queue2.readBuffer(), 256);\n    queue1.freeBuffer();\n    queue2.freeBuffer();\n    int b = 0;\n    int peakL = 0;  \/\/ To store peak value of left channel\n    int peakR = 0;  \/\/ To store peak value of right channel\n    for (int i = 0; i < 512; i += 4) {\n      buffer[i] = bufferL[b];\n      buffer[i + 1] = bufferL[b + 1];\n      buffer[i + 2] = bufferR[b];\n      buffer[i + 3] = bufferR[b + 1];\n\n      \/\/ Check for peak values\n      int16_t valL = (bufferL[b + 1] << 8) | bufferL[b];\n      int16_t valR = (bufferR[b + 1] << 8) | bufferR[b];\n      if (abs(valL) > peakL) peakL = abs(valL);\n      if (abs(valR) > peakR) peakR = abs(valR);\n\n      b += 2;\n    }\n    frec.write(buffer, 512);\n\n    \/\/ Adjust LED based on peak values\n    if (peakL > 5000 || peakR > 5000) {\n      digitalWrite(LED_PIN_1, HIGH);  \/\/ Turn on recording LED if peak is detected\n    } else {\n      digitalWrite(LED_PIN_1, LOW);   \/\/ Turn off recording LED if no peak\n    }\n  }\n}\n\nvoid stopRecording() {\n  Serial.println(\"StopRecording\");\n  queue1.end();\n  queue2.end();\n  \/\/ flush buffer\n  while (queue1.available() > 0 && queue2.available() > 0) {\n    queue1.readBuffer();\n    queue1.freeBuffer();\n    queue2.readBuffer();\n    queue2.freeBuffer();\n  }\n  uint32_t dataSize = frec.size() - 44;\n  frec.seek(0);\n  writeWavHeader(frec, 44100, 16, 2, dataSize);\n  frec.close();\n  mode = 0;\n  digitalWrite(LED_PIN_1, LOW);  \/\/ Turn off recording LED\n  digitalWrite(LED_PIN_2, HIGH); \/\/ Turn on standby LED\n}\n\nvoid stopAll() {\n  if (mode == 1) {\n    stopRecording();\n  }\n  Serial.println(\"StopAll\");\n}\n\nvoid incrementFileName() {\n  fileNumber++;\n  Serial.print(\"Incrementing file number to: \");\n  Serial.println(fileNumber);\n}\n\nvoid eraseWavRecordings() {\n  \/\/ Open the root directory\n  File root = SD.open(\"\/\");\n  \n  \/\/ Delete all .WAV files\n  deleteWavFiles(root);\n\n  \/\/ Close the root directory\n  root.close();\n\n  Serial.println(\"All .WAV recordings erased\");\n}\n\nvoid deleteWavFiles(File dir) {\n  while (true) {\n    File entry = dir.openNextFile();\n    if (!entry) {\n      \/\/ No more files\n      break;\n    }\n    if (entry.isDirectory()) {\n      deleteWavFiles(entry);  \/\/ Recursively delete directory contents\n    } else {\n      String fileName = entry.name();\n      if (fileName.endsWith(\".WAV\")) {\n        SD.remove(entry.name()); \/\/ Delete the file\n        Serial.print(\"Deleted: \");\n        Serial.println(fileName);\n      }\n    }\n    entry.close();\n  }\n}\n\nvoid writeWavHeader(File& file, uint32_t sampleRate, uint16_t bitsPerSample, uint16_t channels, uint32_t dataSize) {\n  uint32_t byteRate = sampleRate * channels * (bitsPerSample \/ 8);\n  uint16_t blockAlign = channels * (bitsPerSample \/ 8);\n\n  file.write(\"RIFF\");\n  file.write((dataSize + 36) & 0xff);\n  file.write(((dataSize + 36) >> 8) & 0xff);\n  file.write(((dataSize + 36) >> 16) & 0xff);\n  file.write(((dataSize + 36) >> 24) & 0xff);\n  file.write(\"WAVE\");\n  file.write(\"fmt \");\n  file.write(16 & 0xff);\n  file.write((16 >> 8) & 0xff);\n  file.write((16 >> 16) & 0xff);\n  file.write((16 >> 24) & 0xff);\n  file.write(1 & 0xff);\n  file.write((1 >> 8) & 0xff);\n  file.write(channels & 0xff);\n  file.write((channels >> 8) & 0xff);\n  file.write(sampleRate & 0xff);\n  file.write((sampleRate >> 8) & 0xff);\n  file.write((sampleRate >> 16) & 0xff);\n  file.write((sampleRate >> 24) & 0xff);\n  file.write(byteRate & 0xff);\n  file.write((byteRate >> 8) & 0xff);\n  file.write((byteRate >> 16) & 0xff);\n  file.write((byteRate >> 24) & 0xff);\n  file.write(blockAlign & 0xff);\n  file.write((blockAlign >> 8) & 0xff);\n  file.write(bitsPerSample & 0xff);\n  file.write((bitsPerSample >> 8) & 0xff);\n  file.write(\"data\");\n  file.write(dataSize & 0xff);\n  file.write((dataSize >> 8) & 0xff);\n  file.write((dataSize >> 16) & 0xff);\n  file.write((dataSize >> 24) & 0xff);\n}\n<\/code><\/pre>\n\n\n\n
    Changes made:<\/h3>\n\n\n\n
      \n
    1. Adjusted the loop condition in continueRecording<\/code><\/strong>: Ensured that b<\/code> does not exceed the valid index range for bufferL<\/code> and bufferR<\/code>.<\/li>\n<\/ol>\n\n\n\n
      This should prevent the undefined behavior and ensure the peak detection works correctly without accessing out-of-bounds array elements.<\/p>\n\n\n\n
      Me:<\/p>\n\n\n\n
      looks good. I’ll test and be back…<\/p>\n\n\n\n
      ChatGPT:<\/p>\n\n\n\n
      Great! Give it a test and let me know how it goes. If you encounter any issues or have further questions, I’m here to help. Happy coding! \ud83c\udfb5<\/p>\n\n\n
      \n
      \"GPT\"<\/figure>\n<\/div>\n\n\n
      <\/p>\n","protected":false},"excerpt":{"rendered":"
      I’ve been working on code for a couple of Teensy Micro Controllers. One board records. The other plays back. I’m […]<\/p>\n","protected":false},"author":1,"featured_media":1449,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[115,15,9],"tags":[116,119,90,118,117],"class_list":["post-1447","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-coding","category-electronics","category-mini-essay","tag-chatgpt","tag-coding","tag-diy","tag-microcontroller","tag-teensy"],"_links":{"self":[{"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/posts\/1447","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/comments?post=1447"}],"version-history":[{"count":5,"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/posts\/1447\/revisions"}],"predecessor-version":[{"id":1461,"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/posts\/1447\/revisions\/1461"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/media\/1449"}],"wp:attachment":[{"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/media?parent=1447"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/categories?post=1447"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ken-beck.com\/words\/wp-json\/wp\/v2\/tags?post=1447"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}