往串口发数据出现死机，日志如下
Current task sp data:
RA:2300b648, mstatus:80007880
A0:ffffffff A1:23085e48 A2:00000002 A3:00000014 A4:00000000 A5:00000003 A6:00000003 A7:4202f8ba
T0:23082938 T1:0000000f T2:a5a5a5a5 T3:00000000 T4:a5a5a5a5 T5:a5a5a5a5 T6:a5a5a5a5
S0:4201e5a4 S1:4201e000 S2:4200fa70 S3:42025494 S4:42013e78 S5:00000010 S6:23087000 S7:00000008
S8:23087000 S9:23083000 S10:23087000 S11:00000000
Exception Entry--->>>
mcause 38000005, mepc 2300b676, mtval 00000004
Exception code: 5
msg: Load access fault
请帮忙分析，谢谢！
