[STM32H5 development board] EXTI interrupt experiment

常见泽1

[STM32H5 development board] EXTI interrupt experiment [Copy link]

The third STM32H5 EXTI test

First, let's confirm the pins needed for EXTI

I really can't find the schematic diagram, I can only read the introduction of Nucleo

PC13 for external EXTI pin

LED uses PF4 port

2. Introduction to EXTI

EXTI monitors the level flip signal of the specified GPIO port. When the level of the GPIO port flips (the rising edge, falling edge or both can be configured), EXTI sends an interrupt request to NVIC. After NVIC's decision, the MCU executes the interrupt program.

Look at the structure diagram of EXTI

Connection diagram of EXTI line

EXTI MUX selection

We use EXTI13 Line in this article

Three creation projects

Setting interrupt priority

I only have one systick interrupt here, so the interrupt priority doesn't matter, just set one at random

Let’s output the code below.

This is how the project is created.

You need to add some code below

Add a callback function in the main function, and the light will flip when the button is pressed.

Four test situations

I took a short video

STM32H5 EXTI

第三篇 STM32H5开发笔记之EXIT测试.pdf (998.72 KB, downloads: 1)

2023-5-5 22:18 上传

点击文件名下载附件

Jacktang

The development board EXTI interrupt experimental test is generally done once, which is the basic work of the development board test

starcat123

Familiar MDK-ARM / CubeMX

H5 seems to be quite new, what’s so special about it?

freebsder

starcat123 posted on 2023-5-9 16:26 The familiar MDK-ARM / CubeMX H5 seems quite new, what is so special about it?

Please update faster... The core seems to be nothing.

常见泽1

starcat123 posted on 2023-5-9 16:26 The familiar MDK-ARM / CubeMX H5 seems quite new, what is so special about it?

At present, it seems that the trustzone M33 belt

The main frequency is higher than M4. The internal clock is higher.