打開對應GPIO時鐘 復用時鐘 USART時鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_USART1, ENABLE );
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設置 TX配置為 復用推挽 RX配置為 開漏輸入
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)結構
USART_InitStructure.USART_BaudRate = 9600;//速率9600
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//數(shù)據(jù)長度
USART_InitStructure.USART_StopBits = USART_StopBits_1;//停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//奇偶校驗
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USART1寄存器
USART_Cmd(USART1,ENABLE);//開啟USART外設
}
發(fā)送數(shù)據(jù)
發(fā)送數(shù)據(jù)
USART_SendData(USART1, ch);
while(USART_GetFlagStatus(USART1, USART_FLAG_TC)==RESET) {}
引腳定義
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IO |
USART |
重定義 |
重定義 |
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PA8 |
USART1_CK |
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PA9 |
USART1_TX |
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PB6 |
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PA10 |
USART1_RX |
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PB7 |
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PA11 |
USART1_CTS |
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PA12 |
USART1_RTS |
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PA0 |
USART2_CTS |
PD3 |
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PA1 |
USART2_RTS |
PD4 |
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PA2 |
USART2_TX |
PD5 |
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PA3 |
USART2_RX |
PD6 |
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PA4 |
USART2_CK |
PD7 |
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PB10 |
USART3_TX |
PD8 |
PC10 |
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PB11 |
USART3_RX |
PD9 |
PC11 |
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PB12 |
USART3_CK |
PD10 |
PC12 |
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PB13 |
USART3_CTS |
PD11 |
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PB14 |
USART3_RTS |
PD12 |
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