在调试期间禁用 STM32 IWDG

问题描述

我在 STM32F4 微控制器上有一个 ChibiOS 3.x 程序，我使用 IWDG 看门狗在出现这样的错误时重置 MCU:

I have a ChibiOS 3.x program on a STM32F4 microcontroller where I use the IWDG watchdog to reset the MCU on errors like this:

int main() {
    iwdgInit();
    iwdgStart(&IWDGD, &wd_cfg);
    while(true) {
        // ... do stuff
    }
}

如果我现在连接调试器并在任何时候停止程序(手动或通过断点)，微控制器将在看门狗配置定义的超时后重置(因此会导致调试过程中出现问题)

If I now attach my debugger and, at any point, stop the program (manually or via a breakpoint), the microcontroller will reset after the timeout defined by the watchdog configuration (and therefore cause issues in my debugging process)

如何禁用此行为，即如何在内核因调试器而停止时禁用 IWDG?

How can I disable this behaviour, i.e. how can I disable the IWDG while the core is stopped due to the debugger?

我已尝试完全禁用它，但是，我需要让它继续运行以捕获不需要的 IWDG 重置.

I have tried disabling it entirely, however, I need to leave it running to catch unwanted IWDG resets.

推荐答案

STM32 MCU 包含一项称为调试冻结的功能.您可以停止多个外设，包括 I2C 超时、RTC，当然还有看门狗.

The STM32 MCUs contain a feature called debug freeze. You can stop several peripherals, including I2C timeouts, the RTC and, of course, the watchdog.

在 STM32 参考手册，请参阅第 38.16.4ff 节MCU 调试组件 (DBGMCU)".

In the STM32 reference manual, refer to section 38.16.4ff "MCU debug component (DBGMCU)".

IWDG 在 APB1 总线上运行.因此，您需要修改DBGMCU_APB1_FZ，特别是该寄存器中的位DBG_IWDG_STOP.

The IWDG is running on the APB1 bus. Therefore you need to modify DBGMCU_APB1_FZ, most specifically assert the bit DBG_IWDG_STOP in that register.

该寄存器的 POR 值(= 默认值)为 0x0，即如果您不主动禁用它，IWDG 仍将运行.

The POR value (= default value) for this register is 0x0, i.e. if you not actively disable it, the IWDG will still be running.

int main() {
    // Disable IWDG if core is halted
    DBGMCU->APB1FZ |= DBGMCU_APB1_FZ_DBG_IWDG_STOP;
    // Now we can enable the IWDG
    iwdgInit();
    iwdgStart(&IWDGD, &wd_cfg);
    // [...]
}

请注意，当未在软件中启用看门狗时，如果在闪存选项字节中重置 WDG_SW 位，则它可能仍会在硬件中启用.

Note that when not enabling the watchdog in software, it might still be enabled in hardware if the WDG_SW bit is reset in the flash option bytes.

如果您使用的是 ST HAL(未包含在 ChibiOS 中，请参阅 STM32CubeF4)，你也可以使用这个宏:

If you are using the ST HAL (not included in ChibiOS, see STM32CubeF4), you can also use this macro:

 __HAL_DBGMCU_FREEZE_IWDG();

(基本上和我们上面做的完全一样)

(which basically does exactly the same as we did above)

此外，在调用__HAL_DBGMCU_FREEZE_IWDG()之前，您需要在APB2上启用DBGMCU时钟.

Besides, you need enable the DBGMCU clock on APB2 before calling __HAL_DBGMCU_FREEZE_IWDG().

 __HAL_RCC_DBGMCU_CLK_ENABLE();

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