一、描述你遇到的问题
使用hi2821开发板，编译sdk里面的uart数据传输测试 demo，用串口线接开发板的pin13 pin14管脚，点击发送数据没有反应。
二、你具体做的所有步骤结果截图
编译烧录UART数据传输测试demo,用串口线接开发板的pin13 pin14管脚，点击发送数据没有任何反应。
三、当前开发板状态全景照片
四、开发板串口所有日志
boot.
Flashboot Init!
Power On
Reboot cause:0xF0F0
Reboot count:0x0
Reboot count:0x0
Flash Init Succ!
No need to upgrade...
Jump to app! addr = 0x90115300
Debug uart init succ:80000
version: BS2X 1.0.11
This sdk only for BearPi_Pico H2821 development board !
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cpu 0 entering scheduler
LOS_QueueCreate queueId 0
LOS_QueueCreate queueId 1
bt at register ret = 80000005
bt at register ret = 80000005
[pm_sys]pm_sys_entry.
uart2 poll mode receive start!
