一、描述你遇到的问题
bearpi-hm nano工控板中，当GPIO2端口打开和关闭时电压不变化
二、你具体做的所有步骤结果截图
使用按钮实例测试板子，按功能按钮LED灯会变化，但是GPIO2电压无变化，怀疑是不是IO烧了，同时写入GPIO3也是如此，串口没有输出……
三、当前开发板状态全景照片
1 Answers
更换PWM实例后日志如下：
watchdog isr
syserr info start
kernel_ver : Hi3861V100 R001C00SPC025,2020-09-03 18:10:00
Exception Information
PC Task Name : PWMTask
PC Task ID = 2
Cur Task ID = 2
Task Stack Size = 0x200
Exception Type = 0x80000021
reg info
mepc = 0x3fa82c
mstatus = 0x1880
mtval = 0x0
mcause = 0x80000021
ccause = 0x0
ra = 0x3f5630
sp = 0xf2620
gp = 0x11a9c0
tp = 0x4dac6400
t0 = 0x3f8dc8
t1 = 0xffffffe0
t2 = 0x28282828
s0 = 0x6
s1 = 0x3e8
a0 = 0x6
a1 = 0xffffffff
a2 = 0x9c40
a3 = 0xe9384
a4 = 0xffffffff
a5 = 0xffffffff
a6 = 0x21212121
a7 = 0x20202020
s2 = 0x9c40
s3 = 0x12121212
s4 = 0x11111111
s5 = 0x10101010
s6 = 0x9090909
s7 = 0x8080808
s8 = 0x7070707
s9 = 0x6060606
s10 = 0x5050505
s11 = 0x4040404
t3 = 0x19191919
t4 = 0x18181818
t5 = 0x17171717
t6 = 0x16161616
memory info
Pool Addr = 0xe8300
Pool Size = 0x302c0
Fail Count = 0x0
Peek Size = 0x13fe0
Used Size = 0xff9c
task info
Name : PWMTask
ID = 2
Status = 0x14
Stack Index = 0x8
Stack Peak = 0x1d4
Stack Size = 0x200
SP = 0x119880
Stack : 0xf25a0 to 0xf27a0
Real SP = 0xf2620
Stack Overflow = 0
track_info
current_item:0x6
item_cnt:10
Index TrackType TrackID CurTime Data1 Data2
0001 0016 0007 0xbfd 0x3f5680 0x0
0002 0016 0007 0xbfe 0x41c244 0x0
0003 0016 0007 0xbff 0x41c238 0x0
0004 0065 0006 0xc00 0x41c238 0x3f5e78
0005 0065 0002 0xc00 0x3f5e78 0x41c238
0006 0016 0007 0xc00 0x3fa868 0x0
0007 0065 0007 0xbfb 0x3f5e78 0x3f5e78
0008 0065 0002 0xbfb 0x3f5e78 0x41c24a
0009 0016 0007 0xbfb 0x4a21b8 0x0
0010 0016 0007 0xbfc 0x3fa84a 0x0
Call Stack
Call Stack 0 -- 3f5684 addr:f26fc
Call Stack 1 -- 3f23e2 addr:f270c
Call Stack 2 -- 41c366 addr:f271c
Call Stack 3 -- 4a21c0 addr:f272c
Call Stack 4 -- 4a323a addr:f274c
Call Stack 5 -- 4a348c addr:f276c
Call Stack 6 -- 3f78c0 addr:f278c
Call Stack 7 -- 3f5e24 addr:f279c
Call Stack end
ready to OS start
sdk ver:Hi3861V100R001C00SPC025 2020-09-03 18:10:00
FileSystem mount ok.
wifi init success!