ST STM32F31xx User Manual

How to use and customize the library
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 main.c: first move the template main.c file to another location (to backup the template
for future use), then create a new empty C file and rename it to main.c. This file will be
used to implement the program code as described in the section below.
 stm32f30x_it.c: use this template file to add the code required to manage the EXTI
Line2 interrupt.
 stm32f30x_it.h: use this template file to add the EXTI Line6 interrupt prototype.
 stm32f30x_conf.h: use this template file without any change
 system_stm32f30x.c: use the template file without any change󳘪
Follow the steps described in Section 2.5: "STM32F30/31xx programming model using the
library" to develop your application.
2.6.2 Library configuration parameters
To configure the library for your application, use the library default parameters as defined in
Section 2.1: "Library configuration parameters"
2.6.3 system_stm32f30x.c
This file contains the SystemInit() function that configures the system clock, system clock
source, PLL Multiplier and Divider factors, AHB/APBx prescalers and Flash settings. This
function is called at startup just after reset and before branch to main program. This call is
made inside the "startup_stm32f30x.s" file.
The clock configuration tool "STM32f30x_Clock_Configuration.xls" is used to generate
system_stm32f30x.c file that configures the device as follow. The table below shows the
default configuration of system_stm32f30xx.c provided within the library:
Table 9: Default clock configuration in system_stm32f30x.c
System Clock source
HSE (System Clock source )
SYSCLK
72000000 Hz
HCLK
72000000 Hz
AHB Prescaler
1
APB1 Prescaler
2
APB2 Prescaler
1
HSE Frequency
8000000 Hz
PLL MUL
9
PREDIV
1
USB clock
ENABLED
Flash latency (number of WS)
2
Prefetch Buffer
ON

ST STM32F31xx Specifications

General

Brand	ST
Model	STM32F31xx
Category	Microcontrollers
Language	English