From Zero to Beeping Button
in One Conversation

Your Freenove ESP32-S3 board does not appear to be attached right now.

The only serial ports present are Bluetooth and the debug console — no USB serial devices were detected. Make sure you're using a data-capable USB cable, not a charge-only cable.

✓ Your ESP32-S3 is detected!

Serial port: /dev/cu.wchusbserial5AB90133721

The wch prefix confirms the CH343/WCH USB serial driver is working. This is your port for flashing and serial communication.

redo that but use a virtual environment. the venv should be stored in the repo

(User interrupted — Claude switched to venv approach)

python3 -m venv .venv
.venv/bin/pip install esptool
# esptool.py v4.11.0 ✓

Detected 8MB flash. Reading full image from the board…

.venv/bin/esptool.py --port /dev/cu.wchusbserial5AB90133721 \
  read_flash 0x0 0x800000 backup/flash_backup_default.bin

# Chip: ESP32-S3 (QFN56) rev v0.2
# PSRAM: 8MB (AP_3v3)
# Flash: 8MB → backup/flash_backup_default.bin ✓

Also wrote restore_default.sh — run it any time to restore the factory firmware.

Researching pin assignments from the official Freenove GitHub repo — downloading their TFT_eSPI setup zip and parsing the actual source files…

Writing sketches/beep_button/beep_button.ino with TFT_eSPI + FT6336U + I2S…

You're right — esptool.py handles the flashing. The pipeline is:

arduino-cli compiles .ino → binary → esptool.py flashes it.

Wrote flash-sketch-001-button-beep.sh which automatically:

• Installs arduino-cli via Homebrew if missing
• Adds Espressif board index and installs ESP32 core
• Installs TFT_eSPI + FT6336U libraries
• Patches TFT_eSPI User_Setup.h with FNK0086 config
• Compiles → build/
• Flashes bootloader + partitions + app via .venv/bin/esptool.py

./flash-sketch-001-button-beep.sh           # compile + flash
./flash-sketch-001-button-beep.sh --compile  # compile only
./flash-sketch-001-button-beep.sh --flash    # flash only

⚠ Error 1: Arduino-FT6336U not in Arduino registry — Freenove custom library.

→ Fixed: download zip directly from Freenove GitHub repo.

⚠ Error 2: Variable named touch clashes with TouchStatusEnum::touch inside the FT6336U library.

→ Fixed: renamed to ts.

⚠ Error 3: driver/i2s.h API deprecated in ESP32 Arduino core 3.x.

→ Fixed: migrated to driver/i2s_std.h with new channel API.

⚠ Error 4: boot_app0.bin lookup used ~/.arduino15 — macOS uses ~/Library/Arduino15.

→ Fixed: search both paths.

# Final flash output:
Wrote 386624 bytes at 0x00010000 in 4.9 seconds
Hash of data verified.
Hard resetting via RTS pin...
[flash] Flash complete. Board is resetting...

Redesigned as a toggle. Audio now runs as a FreeRTOS task on Core 0, continuously generating a sine wave into a phase accumulator. The UI loop on Core 1 simply flips a volatile bool beeping.

10ms fade-in/out envelope avoids clicks on start and stop.

• Tap once → button turns red, shows STOP, 880 Hz tone starts
• Tap again → button turns blue, shows BEEP, tone stops

// FreeRTOS audio task — Core 0
xTaskCreatePinnedToCore(beep_task, "beep", 4096, NULL, 1, NULL, 0);

// Loop on Core 1 — leading-edge toggle
if (hit && !prev_hit) {
    beeping = !beeping;
    draw_button(beeping);
}