STM32 103 USART

作者：時(shí)間：2016-12-01 來(lái)源：網(wǎng)絡(luò)

打開(kāi)對(duì)應(yīng)GPIO時(shí)鐘復(fù)用時(shí)鐘 USART時(shí)鐘

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_USART1, ENABLE );

USART2

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );

USART3
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE );

GPIO設(shè)置 TX配置為復(fù)用推挽 RX配置為開(kāi)漏輸入

void GPIO_Configuration(void)

{

GPIO_InitTypeDefGPIO;

GPIO.GPIO_Pin =GPIO_Pin_9;

GPIO.GPIO_Speed =GPIO_Speed_50MHz;

GPIO.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOA,&GPIO);//端口初始化

GPIO.GPIO_Pin =GPIO_Pin_10;

GPIO.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA,&GPIO);//端口初始化

}

USART配置

void USART_Configuration(void)//初始化USART

{USART_InitTypeDef USART_InitStructure;//聲明參數(shù)結(jié)構(gòu)

USART_InitStructure.USART_BaudRate = 9600;//速率9600

USART_InitStructure.USART_WordLength = USART_WordLength_8b;//數(shù)據(jù)長(zhǎng)度

USART_InitStructure.USART_StopBits = USART_StopBits_1;//停止位

USART_InitStructure.USART_Parity = USART_Parity_No;//奇偶校驗(yàn)

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//硬件流

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//發(fā)送接收使能

USART_Init(USART1, &USART_InitStructure);//根據(jù)USART_InitStruct中指定的參數(shù)初始化外設(shè)USART1寄存器

USART_Cmd(USART1,ENABLE);//開(kāi)啟USART外設(shè)

}

發(fā)送數(shù)據(jù)

USART_SendData(USART1, ch);

while(USART_GetFlagStatus(USART1, USART_FLAG_TC)==RESET) {}

引腳定義

IO	USART	重定義	重定義
PA8	USART1_CK
PA9	USART1_TX		PB6
PA10	USART1_RX		PB7
PA11	USART1_CTS
PA12	USART1_RTS

PA0	USART2_CTS	PD3
PA1	USART2_RTS	PD4
PA2	USART2_TX	PD5
PA3	USART2_RX	PD6
PA4	USART2_CK	PD7

PB10	USART3_TX	PD8	PC10
PB11	USART3_RX	PD9	PC11
PB12	USART3_CK	PD10	PC12
PB13	USART3_CTS	PD11
PB14	USART3_RTS	PD12

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