ESP32 Sketch Uploader

A developer tool to upload ESP32 sketches and data to devices via serial or bootloader, with validation, progress tracking, and error handling.

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About This Tool

This tool targets embedded hardware teams that deploy ESP32 firmware and related data to devices in development or field environments. It replaces manual USB flashing with a repeatable, scripted process.
Conceptually, it opens a serial connection to the ESP32 bootloader, negotiates a stable transfer rate, and streams the firmware image and optional data payload in chunks. It validates each chunk using CRC checks and reports progress.
Unique differentiators include integrated verification, configurable chunk size, and optional data partition alignment. It supports batch deployments to multiple devices and produces a concise summary log. The tool emphasizes reliability, traceability, and compatibility with common ESP32 toolchains across Windows, Linux, and macOS.
It is designed for firmware engineers, test automation teams, and product groups who require repeatable, auditable deployments with clear failure modes and actionable logs.

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How to Use

Connect the ESP32 to the host via USB and identify the serial port.
Specify the firmware_path and optional data_path, along with baud_rate and any partition_map settings.
Enable optional erase_flash or verify_after_write as needed and start the upload process.
Monitor progress and logs; if a chunk CRC fails, retry according to configured policies.
Review the summary of flash regions mapped and verification results after completion.

Frequently Asked Questions

Find Quick Answers

How does progress reporting work?

Progress is reported as a 0-100% value reflecting transferred and verified data. The log includes per-chunk status, estimated completion time, and any retry counts, enabling post-mortem analysis if failures occur.

What if the device port is busy or inaccessible?

The tool returns a specific error code and a descriptive log message. It suggests checking permissions, closing other serial tools, and ensuring the correct port. A retry with alternate port is allowed if configured.

Can I verify after write?

Yes. If verify_after_write is enabled, each transferred chunk is CRC-checked against the source image. A mismatch triggers a retry or abort based on the configured policy, ensuring data integrity.

Does this support OTA-like updates?

The tool supports bootloader-based uploads and data transfers, but OTA orchestration beyond the basic bootloader sequence is out of scope. It focuses on reliable serial-based flashing and data deployment.

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