Use of library functions

Use of library functions

After learning the STM32 for more than a week, I started to use it from lighting up a lamp to interrupting the timing. I found some usage methods for the ST database. Now I will make a summary:

 

1. initialize the struct

A. Define a struct of the xxx-InitTypeDef type. For example, the GPIO-InitStructure of the gpio-InitTypeDef type is used to configure GPIO;

B. Write specific control parameters to these struct members as required, such as GPIO_initStructure.GPIO_Pin = GPIO_Pin_13;

C. use struct as input parameters to call the corresponding peripheral library function xxx-Init () to write control parameters to registers;

 

2. Data Input and Output

A, first through the input parameters to the function to determine the use of peripherals, such as using (GPIOA, GPIO-Pin-5), select the PA5 pin for control;

B. Write or read data operations, such as the function GPIO_WriteBit (GPIOA, 2010GPIO_Pin-5, Bit_RESE), is a write 1 operation on PA5;

C. To Receive external data, call the Read or Receive function to Read the return value of the function to obtain external input data.

 

3. Status bit and flag bit

When we need to know the working status of some peripherals during the program running process, a series of Mark checking functions will be involved:

A. The PPP_GetFlagStatus function is used to check whether a flag of the PPP device is set, for example, TIM _ GetFlagStatus;

B. The function named PPP_ClearFlag is used to clear the peripheral PPP flag, for example, TIM _ ClearFlag;

C. The PPP_GetITStatus function is used to determine whether the interruption from the peripheral PPP occurs, for example, TIM _ GetITStatus;

D. The function named PPP_ClearITPendingBit is used to clear the tag bit of the peripheral PPP interrupt to be processed, for example, TIM _ ClearITPendingBit.

 

Summary:

The official ST database has many common features. Here, we will make a simple classification and summary of the main common functions of peripherals:

 

Function Name	Function	Input parameters	Return Value
XXX-Init ()	Initialize peripherals	XXX-inirTypeDef type struct	Void
XXX-DeInit ()	Initialize peripherals in the system default form	Name of the peripheral to be initialized	Void
XXX-StructInit ()	Fill in the initialization struct with the default data	XXX-InitTypeDef type struct to be filled by default	Void
XXX-SendData ()	Use peripherals to send data	XXX peripheral name; data to be sent	Void
XXX-ReceiveData ()	Obtain the data received by the peripherals.	XXX peripheral name	Returns the received data.
XXX _ GetFlagStatus ()	Detect peripheral event flags	Time flag name to be checked	SET or RESET
XXX _ GetITStatus ()	Check interrupt mark	Indicates the interrupt flag to be checked.	SET or RESET
XXX _ ClearFlag ()	Clear event flag	Event flag name to be cleared	Void
XXX _ ClearITPendingBit ()	Clear the suspended interrupt flag	Indicates the interrupt flag to be detected.	Void
XXX_ITConfig ()	Set peripheral interruption	XXX receives peripherals accordingly; select an interrupt for enabling peripherals	Void
XXX_Cmd ()	Enable or disable peripherals	Configure the peripheral name; ENABLE or DISABLE	Void
XXX _ DMACmd ()	Whether DMA requests can be used outside of Configuration	Configure the peripheral name; select the DMA request to be configured; ENABLE or DISABLE	Void