STM32 Learning 002_Firmware Library Introduction

STM32 programming using library functions

The library function is a function library packaged by the STM32 manufacturer to facilitate user programming.

USART Library Functions

The USART library function includes three initialization functions: 1-default value initialization, 2-normal initialization, and 3-structure class initialization. Generally, we choose the third initialization method.

Step 1: Configure the enable bit (including baud rate, data bit, stop bit, check bit)

First define a structure variable: USART_InitTypeDef USART_InitStructure,

Then, according to the relevant configuration parameters of the structure, configure the parameters actually required.

 USART_InitStructure.USART_BaudRate = 9600; //Set the baud rate to 9600
 USART_InitStructure.USART_WordLength = USART_WordLength_8b; //Data length is 8 bits USART_InitStructure.USART_StopBits
 = USART_StopBits_1; //1 stop bit
 USART_InitStructure.USART_Parity = USART_Parity_No; //No parity bit
 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //Turn off data flow control
 USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; //Optional transmit and receive mode
 USART_Init(USART1, &USART_InitStructure); //Assign values ​​to structure members

 USART_Cmd(USART1 ,ENABLE); //USART1 enable

After configuring the USART1 function, you can call this function to send and display it in the USART1# window.

u8 i ,data = 'A'; //define variables

//Use the for loop to display 20 consecutive characters

for(i=0;i<20;i++)
 {
  USART_SendData(USART1,data);
  data++;
  while( USART_GetFlagStatus(USART1,USART_FLAG_TC) == RESET) ; ; //Judge the TXE/TC bit in the USART_SR register
 }

At this point, you can compile the program. If the compilation is successful, you can perform Debug.