Power Management中的主题 Re: FS6500 execute FS65_WD_Refresh() and enters ResetHandle.

FS6500 execute FS65_WD_Refresh() and enters ResetHandle.

Wangfangyuanx — Tue, 03 Jun 2025 06:52:36 GMT

I referred to the Demo program on the official website(Embedded SW: FS65/FS45 SW Driver | NXP Semiconductors) and ported it to the S32K314 MCU. In the chip initialization function, whenever the FS65_WD_Refresh() function is executed, the MCU resets directly. I measured the RESTB pin and found that whenever the FS65_WD_Refresh() function is executed, the RSTB pin sends a low-level pulse of 10ms. But isn't this function supposed to be a watchdog feeding operation? Why does it perform a reset operation?

Re: FS6500 execute FS65_WD_Refresh() and enters ResetHandle.

guoweisun — Tue, 03 Jun 2025 07:00:32 GMT

在初始化阶段配置好相关的INIT的寄存器以后需要在256ms以内刷新一次WD,看下面的例子：

Re: FS6500 execute FS65_WD_Refresh() and enters ResetHandle.

Wangfangyuanx — Tue, 03 Jun 2025 07:32:44 GMT

该如何修改代码呢，这块驱动代码是移植的官网的 S6500/FS4500 Generic SW Driver with Examples 这个Demo，从代码上看INIT相关的的寄存器是在 FS65_Init()函数中进行配置，在FS65_Init()函数的最后执行了FS65_WD_Refresh();这期间应该是在256ms之内的

Re: FS6500 execute FS65_WD_Refresh() and enters ResetHandle.

guoweisun — Tue, 03 Jun 2025 07:41:44 GMT

假如您执行了配置Init寄存器，然后也在256ms刷新了WD他就会自

动进入normal模式。

这时候需要您正常的喂狗，喂狗错误一样会出问题

或者您在INIT 的阶段把WD disable掉看看有什么发生。操作WD_WINDOW寄存器

Re: FS6500 execute FS65_WD_Refresh() and enters ResetHandle.

Wangfangyuanx — Tue, 03 Jun 2025 09:50:58 GMT

如您所说，把WD disable 之后，回读WD_WINDOW 结果为0x03(默认值),后看了代码发现应该是没有配置INIT和 WD相关寄存器，却执行FS65_WD_Refresh() 导致的异常复位。通过分析Demo 代码可以看出，上电后首先读取 MODE 寄存器获取当前MODE，如果返回是 INIT mode才会对INIT 和WD相关寄存器进行配置。从Debug仿真结果来看，上电读到MODE 为 Normal mode。请问这是什么原因，读取MODE寄存器之前是否还需要进行其他的操作？

Re: FS6500 execute FS65_WD_Refresh() and enters ResetHandle.

guoweisun — Tue, 03 Jun 2025 11:24:08 GMT

---上电读到MODE 为 Normal mode。请问这是什么原因，读取MODE寄存器之前是否还需要进行其他的操作？

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一开始上电就是初始化阶段不可能是normal模式的。

12.1.6 Normal
In this mode, all device functions are available. This mode is entered by a SPI command from the INIT phase by writing in the INIT_INT register. While in normal mode, the device can be set to low-power mode (LPOFF) using secured SPI command.

读取MODE寄存器是让你了解SBC在哪个阶段，不是什么特殊的步骤