今天學(xué)習(xí)了串口通信，全雙工異步的USART,一個起始位，8個或者9個數(shù)據(jù)位，所以數(shù)據(jù)位傳輸?shù)臅r候設(shè)為16位，一位檢驗位，一位結(jié)束為，分別初始化串口，查詢硬件原理圖串口1掛在AHB1總線上，初始化時鐘，封發(fā)送數(shù)據(jù)的函數(shù)，檢驗狀態(tài)標(biāo)志位，程序如下：

#include "main.h"

void UART1_config(void)

{

GPIO_InitTypeDef GPIO_InitStruct;

USART_InitTypeDef USART_InitStruct;

//1.????GPIO1ü?? PA9 PA10 ?′ó?

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

GPIO_InitStruct.GPIO_Pin? = GPIO_Pin_9|GPIO_Pin_10;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;

GPIO_Init(GPIOA, &GPIO_InitStruct);

//2.éè??1ü???′ó?°ó?¨

GPIO_PinAFConfig(GPIOA, GPIO_PinSource9,GPIO_AF_USART1);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource10,GPIO_AF_USART1);

//3.3?ê??ˉ′??ú1

USART_InitStruct.USART_BaudRate? = 9600;

USART_InitStruct.USART_WordLength = USART_WordLength_8b;

USART_InitStruct.USART_Parity? = USART_Parity_No;

USART_InitStruct.USART_StopBits = USART_StopBits_1;

USART_InitStruct.USART_Mode = USART_Mode_Rx|USART_Mode_Tx;

USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

USART_Init(USART1,&USART_InitStruct);

USART_Cmd(USART1, ENABLE);

}

void uart_send_data(u8 data)

{

USART_SendData(USART1, data);

while(USART_GetFlagStatus(USART1,USART_FLAG_TXE) == RESET);

}

void uart_send_str(u8 *buf,u32 n)

{

u32 i;

for(i=0;i

int main(void)

{

u8 *str="hello,world";

UART1_config();

uart_send_str(str,11);

while (1)

{

}

}