1. Function description

1. This example shows how to control the LED flashing by externally triggering an interrupt


2. Use environment

/* Hardware environment: the development hardware platform corresponding to the project */
Development board: N32L43XM-STB N32L40XM-STB V1.1

3. Instructions for use

/* Describe the configuration method of related modules; for example: clock, I/O, etc. */
1. SystemClock: 108MHz
2. GPIO: PA8 is selected as the external interrupt entry, PB4 control LED (D2) is always on, PB5 control LED (D3) is blinking


/* Describe the test steps and phenomena of Demo */
1. After compiling, download the program to reset and run;
2. LED (D2) is always on, connect PA8 to 3.3V and then disconnect it, LED (D3) flashes;


4. Matters needing attention
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