wangfq
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docs: BLE+Modbus 双通道并发资源分析
关键发现:
- BLE TX 不阻塞CPU (CH59x 射频DMA自主发送), Modbus TX 阻塞4.3ms
- 两者使用不同硬件 (2.4GHz RF vs UART0), 无资源冲突
- BLE RF ISR 优先级最高, 可抢占 rs485_send 忙等 → BLE连接不中断
- 双通道全开 CPU 44.5%, 余量55%
- 同一迭代最坏: BLE准备(2ms) + Modbus TX(4.3ms) = 6.3ms
- 两者事件触发同源(继电器翻转), 在同一迭代内顺序处理
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