-2都是什么错误？中断触发给线程信号量引发系统错误

发布于 2020-12-11 17:45:13 浏览：1348 订阅该版

按键用HC164设计，HC164的一个输入引脚设置成中断模式，同时系统的一个485接口上有几个从设备，当从设备不接时，按下按键就触发以下错误但是当485从设备存在时不会出现该错误，用CmBacktrace追踪都是系统函数，这咋回事？
```
2020-12-11 17:39:15.668 R]thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
mbtcp_te  12  suspend 0x000002c8 0x00000800    73%   0x00000001 000
Mb_RTUM_   9  suspend 0x000000dc 0x00000800    44%   0x00000006 000
Mb_RTUM_   8  suspend 0x0000017c 0x00000800    49%   0x00000001 000
Mb_RTUS_   7  suspend 0x000001f4 0x00000800    30%   0x0000000a 000
tshell    20  suspend 0x00000184 0x00001000    09%   0x00000009 000
HC148_EX   6  ready   0x000000a0 0x00000200    41%   0x00000030 -02
wiz_stat  28  suspend 0x000000b8 0x00000800    16%   0x00000013 000
wiz        5  suspend 0x000000b0 0x00000200    72%   0x00000008 000
sample_L  14  ready   0x000001dc 0x00000800    43%   0x0000002e 000
sys_work  23  suspend 0x00000084 0x00000800    63%   0x00000001 000
tidle0    31  ready   0x00000060 0x00000100    53%   0x0000001f 000
timer      4  suspend 0x000000b0 0x00000200    88%   0x00000009 000
main      10  suspend 0x00000148 0x00000800    60%   0x0000000c 000

Firmware name: rtthread, hardware version: 1.0, software version: 1.0

Fault on interrupt or bare metal(no OS) environment

===== Thread stack information =====

addr: 20000bb8    data: deadbeef
  addr: 20000bbc    data: deadbeef
  addr: 20000bc0    data: 20002510
  addr: 20000bc4    data: 20003b38
  addr: 20000bc8    data: 20003b38
  addr: 20000bcc    data: 20002510
  addr: 20000bd0    data: 81dfffc0
  addr: 20000bd4    data: 0800701d
  addr: 20000bd8    data: 08006c54
  addr: 20000bdc    data: 0101000f
  addr: 20000be0    data: 20003b38
  addr: 20000be4    data: 20002510
  addr: 20000be8    data: 20008dd0
  addr: 20000bec    data: 20000bf0
  addr: 20000bf0    data: 2000200c
  addr: 20000bf4    data: 20003b24
  addr: 20000bf8    data: 00000000
  addr: 20000bfc    data: 00000000
  addr: 20000c00    data: 20000c08
  addr: 20000c04    data: 08006eef
  addr: 20000c08    data: 00000001
  addr: 20000c0c    data: 00000006
  addr: 20000c10    data: 20003b24
  addr: 20000c14    data: 00000001
  addr: 20000c18    data: 00000001
  addr: 20000c1c    data: 200024bc
  addr: 20000c20    data: 20000c28
  addr: 20000c24    data: 080078d5
  addr: 20000c28    data: 20000c30
  addr: 20000c2c    data: 200050d0
  addr: 20000c30    data: 20007a54
  addr: 20000c34    data: 200050d0
  addr: 20000c38    data: 20000c40
  addr: 20000c3c    data: 08007fad
  addr: 20000c40    data: 2000511c
  addr: 20000c44    data: 0000bd2d
  addr: 20000c48    data: 20000c50
  addr: 20000c4c    data: 2000430c
  addr: 20000c50    data: 20000c58
  addr: 20000c54    data: 0800383b
  addr: 20000c58    data: 20000ff4
  addr: 20000c5c    data: 20003b24
  addr: 20000c60    data: 20000c68
  addr: 20000c64    data: 08023961
  addr: 20000c68    data: 20004298
  addr: 20000c6c    data: ffffffed
  addr: 20000c70    data: 20000c94
  addr: 20000c74    data: 10000000
  addr: 20000c78    data: 00000000
  addr: 20000c7c    data: 20001010
  addr: 20000c80    data: 00000000
  addr: 20000c84    data: 08006e0b
  addr: 20000c88    data: 08006e0a
  addr: 20000c8c    data: 01000200
  addr: 20000c90    data: 080235db

====================================

=================== Registers information ====================

R0 : fffffff1  R1 : fffffff1  R2 : 00000001  R3 : deadbeef

R12: deadbeef  LR : 20000be0  PC : deadbeef  PSR: deadbeef

==============================================================

Bus fault is caused by imprecise data access violation

Show more call stack info by run: addr2line -e rtthread.elf -a -f deadbeef 0800701c 08006eee 080078d4 08007fac 0800383a 08023960 08006e0a 080235da 
```
Current system tick: 48429
![image.png](/uploads/20201211/2301118e685a688f7c4120464f72235a.png)