Public Access
mangavalkandClaude Opus 5.5
cefb76c1ad
- Uploader sends 'FLASH <baud>' first; the ESP32 restarts the Nano and bridges at that baud rate, then answers OK - --baud=auto (default) tries 57600 (old ATmegaBOOT) then 115200 (Optiboot) - Optional nano_reset GPIO (NPN to Nano RESET) pulses reset after power on, needed for Optiboot which skips the bootloader after a power cycle - Clear errors for outdated ESP32 firmware and missing wires - README: bootloader table, reset wire, troubleshooting Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
#pragma once
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#include <Arduino.h>
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#include <WiFi.h>
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// WiFi to serial bridge for flashing the Nano from the PC (pio run -e nano_ota -t upload).
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//
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// The uploader (tools/nano_net_upload.py) connects and first sends one line:
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// FLASH <baud>\n
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// with the baud rate of the Nano's bootloader (57600 old bootloader, 115200 Optiboot).
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// onStart(baud) then restarts the Nano into its bootloader, the bridge answers "OK\n",
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// and from then on bytes are copied between the TCP connection and the Nano's serial port
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// until the client disconnects or is idle too long. onEnd() is then called.
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class NanoFlashBridge
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{
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public:
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NanoFlashBridge(uint16_t port, HardwareSerial &serial, void (*onStart)(uint32_t baud), void (*onEnd)());
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void begin();
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// Call from loop(). Returns true while a flash session is running; the caller must not
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// send anything to the Nano then.
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bool handle();
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private:
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// Max wait for the FLASH line after connecting
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static const uint32_t HEADER_TIMEOUT = 2000;
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// Give up when no data moves in either direction for this long
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static const uint32_t IDLE_TIMEOUT = 10000;
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WiFiServer _server;
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WiFiClient _client;
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HardwareSerial &_serial;
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void (*_onStart)(uint32_t baud);
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void (*_onEnd)();
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bool _active = false;
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uint32_t _last_activity = 0;
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uint32_t _readHeader(WiFiClient &client);
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void _end();
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};
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