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In production, you'd use\n * a library like esptool-js for full ESP32/ESP8266 flashing capabilities.\n */\nexport class SerialService {\n private port: SerialPort | null = null;\n private reader: ReadableStreamDefaultReader | null = null;\n private writer: WritableStreamDefaultWriter | null = null;\n private connected = false;\n\n /**\n * Check if Web Serial API is supported\n */\n static isSupported(): boolean {\n return 'serial' in navigator;\n }\n\n /**\n * Get list of available serial ports\n */\n async getPorts(): Promise {\n if (!SerialService.isSupported()) {\n throw new Error('Web Serial API not supported');\n }\n return await navigator.serial.getPorts();\n }\n\n /**\n * Request access to a serial port\n */\n async requestPort(): Promise {\n if (!SerialService.isSupported()) {\n throw new Error('Web Serial API not supported');\n }\n \n return await navigator.serial.requestPort({\n filters: [\n // ESP32 development boards\n { usbVendorId: 0x10C4, usbProductId: 0xEA60 }, // CP210x\n { usbVendorId: 0x1A86, usbProductId: 0x7523 }, // CH340\n { usbVendorId: 0x0403, usbProductId: 0x6001 }, // FTDI\n { usbVendorId: 0x239A }, // Adafruit boards\n { usbVendorId: 0x303A }, // Espressif boards\n ]\n });\n }\n\n /**\n * Connect to a serial port\n */\n async connect(port?: SerialPort, baudRate: number = 115200): Promise {\n try {\n if (!port) {\n port = await this.requestPort();\n }\n\n await port.open({ \n baudRate,\n dataBits: 8,\n stopBits: 1,\n parity: 'none',\n flowControl: 'none'\n });\n\n this.port = port;\n this.reader = port.readable?.getReader() || null;\n this.writer = port.writable?.getWriter() || null;\n this.connected = true;\n\n console.log('Connected to serial port');\n } catch (error) {\n console.error('Failed to connect to serial port:', error);\n throw error;\n }\n }\n\n /**\n * Disconnect from serial port\n */\n async disconnect(): Promise {\n try {\n if (this.reader) {\n await this.reader.cancel();\n this.reader.releaseLock();\n this.reader = null;\n }\n\n if (this.writer) {\n await this.writer.close();\n this.writer = null;\n }\n\n if (this.port) {\n await this.port.close();\n this.port = null;\n }\n\n this.connected = false;\n console.log('Disconnected from serial port');\n } catch (error) {\n console.error('Error during disconnect:', error);\n throw error;\n }\n }\n\n /**\n * Check if connected\n */\n isConnected(): boolean {\n return this.connected && this.port !== null;\n }\n\n /**\n * Send data to the device\n */\n private async sendData(data: Uint8Array): Promise {\n if (!this.writer) {\n throw new Error('Not connected to serial port');\n }\n await this.writer.write(data);\n }\n\n /**\n * Read data from the device\n */\n private async readData(timeout: number = 5000): Promise {\n if (!this.reader) {\n throw new Error('Not connected to serial port');\n }\n\n return new Promise((resolve, reject) => {\n const timeoutId = setTimeout(() => {\n reject(new Error('Read timeout'));\n }, timeout);\n\n this.reader!.read().then(({ value, done }) => {\n clearTimeout(timeoutId);\n if (done || !value) {\n reject(new Error('No data received'));\n } else {\n resolve(value);\n }\n }).catch(reject);\n });\n }\n\n /**\n * Enter bootloader mode (simplified)\n */\n private async enterBootloader(): Promise {\n // This is a simplified implementation\n // Real implementation would handle DTR/RTS signals for ESP32/ESP8266\n console.log('Entering bootloader mode...');\n \n // Send break condition and sync\n const syncCommand = new Uint8Array([0xC0, 0x00, 0x08, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x07, 0x12, 0x20, 0xC0]);\n await this.sendData(syncCommand);\n \n // Wait for response\n try {\n await this.readData(2000);\n console.log('Bootloader sync successful');\n } catch (error) {\n console.warn('Bootloader sync may have failed:', error);\n }\n }\n\n /**\n * Read device information (mock implementation)\n */\n async readDeviceInfo(): Promise {\n if (!this.isConnected()) {\n throw new Error('Not connected to device');\n }\n\n try {\n await this.enterBootloader();\n \n // Mock device info - in real implementation, this would read from the chip\n const deviceInfo: DeviceInfo = {\n mac: this.generateMockMAC(),\n chipType: 'ESP32', // Would be detected from chip ID\n features: ['WiFi', 'Bluetooth', 'Flash Encryption'],\n flashSize: 4 * 1024 * 1024, // 4MB\n crystalFreq: 40000000 // 40MHz\n };\n\n return deviceInfo;\n } catch (error) {\n console.error('Failed to read device info:', error);\n throw error;\n }\n }\n\n /**\n * Flash firmware to device\n */\n async flashFirmware(\n firmware: ArrayBuffer,\n onProgress?: (progress: FlashProgress) => void\n ): Promise {\n if (!this.isConnected()) {\n throw new Error('Not connected to device');\n }\n\n try {\n const stages: FlashStage[] = ['connecting', 'reading_info', 'erasing', 'flashing', 'verifying', 'complete'];\n \n for (let i = 0; i < stages.length; i++) {\n const stage = stages[i];\n const progress = Math.round((i / (stages.length - 1)) * 100);\n \n onProgress?.({\n stage,\n progress,\n message: this.getStageMessage(stage)\n });\n\n // Simulate stage processing time\n await this.delay(stage === 'flashing' ? 3000 : 1000);\n\n if (stage === 'erasing') {\n await this.eraseFlash();\n } else if (stage === 'flashing') {\n await this.writeFlash(firmware, onProgress);\n }\n }\n\n console.log('Firmware flashing completed successfully');\n } catch (error) {\n console.error('Firmware flashing failed:', error);\n onProgress?.({\n stage: 'error',\n progress: 0,\n message: 'Flashing failed',\n error: error instanceof Error ? error.message : 'Unknown error'\n });\n throw error;\n }\n }\n\n /**\n * Erase flash memory\n */\n private async eraseFlash(): Promise {\n console.log('Erasing flash memory...');\n // Mock erase operation\n await this.delay(1000);\n }\n\n /**\n * Write firmware to flash\n */\n private async writeFlash(\n firmware: ArrayBuffer,\n onProgress?: (progress: FlashProgress) => void\n ): Promise {\n console.log('Writing firmware to flash...');\n \n const data = new Uint8Array(firmware);\n const blockSize = 1024; // 1KB blocks\n const totalBlocks = Math.ceil(data.length / blockSize);\n\n for (let i = 0; i < totalBlocks; i++) {\n const start = i * blockSize;\n const end = Math.min(start + blockSize, data.length);\n const block = data.slice(start, end);\n \n // Mock writing block\n await this.delay(50);\n \n const progress = Math.round((i / totalBlocks) * 100);\n onProgress?.({\n stage: 'flashing',\n progress,\n message: `Writing block ${i + 1}/${totalBlocks}`\n });\n }\n }\n\n /**\n * Reset device\n */\n async resetDevice(): Promise {\n if (!this.isConnected()) {\n throw new Error('Not connected to device');\n }\n\n console.log('Resetting device...');\n // Mock reset - real implementation would toggle DTR/RTS\n await this.delay(500);\n }\n\n /**\n * Generate mock MAC address\n */\n private generateMockMAC(): string {\n const mac = [];\n for (let i = 0; i < 6; i++) {\n mac.push(Math.floor(Math.random() * 256).toString(16).padStart(2, '0'));\n }\n return mac.join(':').toUpperCase();\n }\n\n /**\n * Get human-readable message for flash stage\n */\n private getStageMessage(stage: FlashStage): string {\n const messages: Record = {\n connecting: 'Connecting to device...',\n reading_info: 'Reading device information...',\n erasing: 'Erasing flash memory...',\n flashing: 'Writing firmware...',\n verifying: 'Verifying firmware...',\n complete: 'Flashing completed successfully!',\n error: 'An error occurred'\n };\n return messages[stage];\n }\n\n /**\n * Utility delay function\n */\n private delay(ms: number): Promise {\n return new Promise(resolve => setTimeout(resolve, ms));\n }\n\n /**\n * Get port information\n */\n getPortInfo(): { connected: boolean; port?: SerialPort } {\n return {\n connected: this.connected,\n port: this.port || undefined\n };\n }\n}\n\n// Export singleton instance\nexport const serialService = new SerialService();","deleted","label",[170,171,152],"frontend","services","permalink","https://www.val.town/x/canstralian/ESP32-FirmwareFlasher/code/frontend/services/serialService.ts","extension","actionData","errors"]