Ryan Malloy
068f38d7eb
NimBLE-based Nordic UART Service (NUS) bridge on ESP32-S3-DevKitC-1. Transparent passthrough: BLE client writes → UART1 TX → RS-422 → G2, and G2 → RS-422 → UART1 RX → BLE notifications. USB serial serves as debug monitor and fallback input. Uses two MAX485 modules (one locked TX, one locked RX) with a SparkFun BSS138 level converter for 3.3V/5V translation. Wiring schematic and RJ-12 pinout documented in docs/ble-bridge-wiring.md.
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
#pragma once
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// --- GPIO Pin Assignments ---
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// UART1 to RS-422 module via 3.3V<->5V level shifter
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#define PIN_RS422_TX 17 // ESP32 TX -> level shifter -> MAX490 RXD
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#define PIN_RS422_RX 18 // MAX490 TXD -> level shifter -> ESP32 RX
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// Onboard RGB LED (WS2812, DevKitC-1 V1.1)
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#define PIN_LED 38
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// --- RS-422 UART (UART1) ---
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#define RS422_BAUD 115200
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#define RS422_CONFIG SERIAL_8N1
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// --- BLE Configuration ---
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#define BLE_DEVICE_NAME "Travler-G2"
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#define BLE_MTU 517
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// Max payload per NUS notification (must fit in ATT_MTU - 3)
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#define BLE_NOTIFY_MAX 240
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// Nordic UART Service UUIDs
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#define NUS_SERVICE_UUID "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
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#define NUS_RX_UUID "6E400002-B5A3-F393-E0A9-E50E24DCCA9E" // Client writes here
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#define NUS_TX_UUID "6E400003-B5A3-F393-E0A9-E50E24DCCA9E" // ESP32 notifies here
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// --- Timing ---
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// Inter-byte coalescing window: collect bytes arriving within this
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// gap into one BLE notification instead of sending byte-by-byte
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#define COALESCE_MS 3
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// LED refresh interval
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#define LED_UPDATE_MS 50
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// --- LED ---
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#define LED_BRIGHTNESS 30 // 0-255, keep low to avoid blinding in enclosure
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#define LED_COUNT 1
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// --- Buffers ---
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#define UART_RX_BUF_SIZE 512
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