Processing of default settings after GPIO power-on of HUADA MCU

小虎妞

Processing of default settings after GPIO power-on of HUADA MCU [Copy link]

 

How to solve the problem that a pin of the Huada MCU always outputs a high-level pulse after power-on reset/hardware reset.
Check the Huada MCU manual. After power-on or hardware reset, the GPIO pin should be in the mode of "input, output register is uncertain".
The manual clearly states the setting of "input, output register is uncertain" for the following two registers.


But in actual use, look at the status of the two registers through keil debug:

324.zip (263.77 KB, downloads: )

2006-7-25 22:04 上传

点击文件名下载附件

The above two registers are the values observed by the breakpoint when the program runs to the _HidePinInit function in the system_hc32l110.c file.


So on the P35 pin, there is a short high-level pulse after the hardware is restarted.

It is recommended to make sure the pin status of each GPIO on our board is clear, and it is best to configure the status of all GPIOs clearly when the program is just started.
It is recommended to set it in the _HidePinInit function in the system_hc32xxx.c file so that the chip has a clear GPIO status when it starts to avoid similar problems.

w494143467

Indeed, the default state of the pins may affect the state of the peripherals, and it is good to know the state of the GPIO at reset!

freebsder

It is true that if the initial IO is not controlled properly, the externally controlled device may be destroyed.

江长活

The default state of the pin may affect the state of the peripherals, so it must be set before powering on, including output and input.