wangfq
3d4814bffe
fix(vd960DBN): init/clear 懒擦修复不断重启 — 34s 全量擦除超 IWDG 4s
现场: 烧录快照固件后 CH32V208 不断重启 + 串口乱码
根因: snap_init 首擦 751 扇区 ~34s (头在擦完才写→复位后仍全新→死循环);
snap_clear 34s / offlog_clear 2.8s 同类; 均超 IWDG 4s
修复(懒擦): init/clear 只擦写指针起点扇区 ~45ms, 其余由环形写切扇区
逻辑自动擦; clear 为逻辑清除 (count=0 旧数据不可读)
附带: usart_biz.c 非 0x7F 帧 %s 打印改 hex (Loop 数据当字符串=乱码源)
snapshot.h 线程模型注释修正 (lup_process_frame 实际在主循环 uart_srv)
测试: test_snapshot 9例(新增 lazy_erase) + offlog/ble_offlog 回归全过
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