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refactor: Modbus 默认波特率 115200 + 资源分析重评估

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分析结论 (115200 vs 9600):
- TX 阻塞: 4.3ms (曾 44.8ms) → 活动态 CPU 仅 +2.9%
- 主循环延迟 < 半个测量窗, 不影响线圈检测/光耦/BLE
- 从"临界可用"变为"完全充裕"

固件修复:
- rs485_init: 硬编码 RS485_BAUD → 使用 g_storage_uart_baud (flash 可配)
- 协议文档: Modbus 默认 115200
- DLD154Tool: 串口默认 115200
This commit is contained in:
wangfq
2026-07-30 17:39:27 +08:00
parent 2088cc267c
commit 2142674c3e
5 changed files with 40 additions and 37 deletions
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docs/rs485-modbus-protocol.md
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@@ -15,7 +15,7 @@
|------|-----|
| 接口 | RS485 半双工 (UART0) |
| 引脚 | PA14 TX, PA15 RX, PA13 RE (方向控制) |
| 波特率 | 9600 (默认), 19200, 38400, 57600, 115200 |
| 波特率 | 9600 (700BS 默认), **115200 (Modbus 默认, 推荐)** |
| 数据位 | 8 |
| 校验 | 无 (N) |
| 停止位 | 1 |