rt-thread-packages / cmux Goto Github PK
View Code? Open in Web Editor NEWconnection multiplexing protocol for RT-Thread, support GSM0710 .etc
License: Apache License 2.0
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xiangxistu alexchj guanxionghui mmin95 taoli9988 qiyongzhong0 shuibin tangyf-github ouxinhi venividivici6 sdutlrh john-j-smith armink-rtt-pkgs neosmatrix petercao woohaha zydroidcmux's Issues
CMUX中AT指令与PPP两通道同时使用情况下，中途拆除SIM卡，出现内存访问越界导致死机
开发环境
- STM32F429
- RAM 32MB(EXT)
- ROM 1MB
- EC20 4G模组
- keil MDK
- Windows
- 软件包：cmux,at_client,ppp
操作流程及现象
- 开机后启动CMUX
- 在 cmux.at 通道上注册EC20设备（只初始化，不注册为网络设备。这一点对实验结果无影响）
- 启动PPP
- ping baidu.com 成功
- 手动拿掉SIM卡，5-10s后收到AT通道发出的:
- +CPIN: NOT READY
- +QIURC: "pdpdeact",1
- 发生内存访问越界，命令行中会打印出大量字符串，目测是flash中内容，然后死机
追踪
追踪了一下LR寄存器中的定位，在接收到+QIURC: "pdpdeact",1之后 cmux.c-L972处 data指针指向地址异常，至于是什么原因导致了此异常，劳烦熟悉cmux软件架构的维护人员分析下了
CMUX should allow user to decide the physical UART TX method.
Line 51 in c00d769
The default UART TX method is polling. But users might want to use INT or DMA.
The TX should configurable by the user.
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