问题解决了 3.3V 欠压

HLK-LD2402_TOOL.exe 提示串口设备打开失败

重新上电：
[2026-09-09 14:57:28.666]# RECV ASCII/1 <<<

[2026-09-09 14:57:29.385]# RECV ASCII/51 <<<
Error: flashDataLen is more than FLASH_PAGE_SIZE!

[2026-09-09 14:57:29.477]# RECV ASCII/10 <<<
ADC: 4095

[2026-09-09 14:14:51.207]# RECV HEX/1 <<<
F0

[2026-09-09 14:14:51.884]# RECV HEX/51 <<<
45 72 72 6F 72 3A 20 66 6C 61 73 68 44 61 74 61 4C 65 6E 20 69 73 20 6D 6F 72 65 20 74 68 61 6E 20 46 4C 41 53 48 5F 50 41 47 45 5F 53 49 5A 45 21 0D 0A

[2026-09-09 14:15:55.570]# RECV ASCII/8 <<<

[2026-09-09 14:16:10.193]# RECV HEX/2 <<<
C0 FF

[2026-09-09 14:16:10.873]# RECV HEX/51 <<<
45 72 72 6F 72 3A 20 66 6C 61 73 68 44 61 74 61 4C 65 6E 20 69 73 20 6D 6F 72 65 20 74 68 61 6E 20 46 4C 41 53 48 5F 50 41 47 45 5F 53 49 5A 45 21 0D 0A

[2026-09-09 14:16:19.742]# RECV ASCII/51 <<<
Error: flashDataLen is more than FLASH_PAGE_SIZE!

[2026-09-09 14:16:21.146]# RECV ASCII/10 <<<
ADC: 4095

HLK-LD2402 输入电压不是3.3v吗