1. Function description

         /* Briefly describe the project function */
         This example demonstrates how to set and adjust the HSI system clock and output it from PA8 using MCO

2. Use environment

         /* Hardware environment: the development hardware platform corresponding to the project */
         Development board: N32L43XR-STBV1.0

3. Instructions for use

         /* Describe related module configuration methods; for example: clock, I/O, etc. */
         SystemClock: 108MHz

         USART: TX - PB4, baud rate 115200
         GPIO: PA8 - multiplexed as MC0 clock output

         /* Describe the test steps and phenomena of the Demo */
         1. After compiling, download the program to reset and run;
         2. Reset the calibration value of the internal high-speed clock, configure the system clock as HSI, use the serial port to print out the current SYSCLK, HCLK, PCLK1, PCLK2 
            and other information, and use the PA8 multiplexing pin to output the clock and view it with an oscilloscope;

4. Matters needing attention