topic Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB in Power Management

Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB SERVER" ?

Allen_863 — Mon, 17 Nov 2025 10:03:38 GMT

I've noticed that whenever I select "DEBUG MODE EXIT" on the FS26 and burn the S32K3X4EVB-T172 using MicroUSB, this message " CONNECTION CLOSED BY GDB SERVER " appears the next time I do so.

However, if I don't use the "DEBUG MODE EXIT" option for FS26, I can repeatedly flash the program without encountering the "CONNECTION CLOSED BY GDB SERVER" error. Why is that?

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

guoweisun — Tue, 18 Nov 2025 05:35:34 GMT

你可以看看他的解释，你下面的操作都是在debug模式下完成的并没有退出debug模式进行很多次的烧写程序。

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

Allen_863 — Tue, 18 Nov 2025 05:41:47 GMT

我目前的状态是如果在 DEBUG 模式下，我可以反复烧录，但是我如果脱离 DEBUG 模式，在 NORMAL 状态下，我第二次烧录就会出现 CONNECTION CLOSED BY GDB SERVER，但是不知道具体原因是什么 ?

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

guoweisun — Tue, 18 Nov 2025 05:49:37 GMT

所以你烧录的程序是跟FS26无关的程序，只是S32K本身控制其他器件的程序吗?

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

Allen_863 — Tue, 18 Nov 2025 05:54:02 GMT

烧录的程序与 FS26 有关，而且我反复排查以后，我已经确定它与 EXIT DEBUG MODE 有关，就是我只要不进行 EXIT DEBUG MODE 就可以反复烧录，但是只要我进行 EXIT DEBUG MODE，下次烧录就会出现 CONNECTION CLOSED BY GDB

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

guoweisun — Tue, 18 Nov 2025 06:01:24 GMT

我理解的是退出debug模式的话下一步就是要release FS0B/FS1B然后进入normal模式了这时候就要对SBC进行周期性喂狗了，不然RSTB就会被拉低，这样你的MCU就会latch了没有反应。

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

Allen_863 — Tue, 18 Nov 2025 06:13:56 GMT

但是我也有周期性喂狗，而且从目前 REGISTER 读出来并没有任何错误，就 FS_COM_G / FS_WD_G / FS_IO_G / FS_REG_OVUV_G / FS_BIST_G 全部都是 0，但是一样会有第二次烧录就 CONNECTION CLOSED BY GDB SERVER 的现象

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

guoweisun — Tue, 18 Nov 2025 06:16:39 GMT

可以测试一下RSTB pin是什么状态在MCU latch的时候。

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

Allen_863 — Tue, 18 Nov 2025 06:29:52 GMT

我烧录完后 RSTB 是处于 HIGH 状态，中途并不会突然拉低，中途也不会突然重置

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

guoweisun — Tue, 18 Nov 2025 06:38:10 GMT

如果你选上了这个功能，他的程序改动的地方就在上面SBC_FS26_EXIT_DBG_MODE_ENABLED (STD_ON)，，如果没有勾上这个功能SBC_FS26_EXIT_DBG_MODE_ENABLED (STD_OFF)

从程序的角度上他实现的是这个功能。

这个SBC_FS26_EXIT_DBG_MODE_ENABLED 会在Sbc_fs26_NormalFSSequence这个函数里面被调用。

仅此而已！

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

Allen_863 — Tue, 18 Nov 2025 06:44:56 GMT

我有试过注解掉 Sbc_fs26_NormalFSSequence 里面的 Sbc_fs26_ExitDebugMode，然后在循环内，数到特定秒数就执行 Sbc_fs26_ExitDebugMode，一样会发生同样的情况，不知道具体原因是什么 ?

Re: Why does the DEBUG MODE EXIT setting on the FS26 cause the error "CONNECTION CLOSED BY GDB

guoweisun — Tue, 18 Nov 2025 06:55:04 GMT

执行Sbc_fs26_ExitDebugMode是有一定的条件的，比方说debugpin的电压是高电平，fault error counter 是0，然后SBC处在 Safety Outputs not released的状态