江科大學(xué)習(xí)筆記 _11.串口
1.?開(kāi)時(shí)鐘 GPIO UART
2.?配置GPIO，復(fù)用UART 的RX、TX
3.?配置UART結(jié)構(gòu)體
4.?中斷接收
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1.?開(kāi)時(shí)鐘 GPIO UART
?RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
?RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
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2.?配置GPIO，復(fù)用UART 的RX、TX
//發(fā)送引腳
????GPIO_InitTypeDef GPIO_InitStruct;
????GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;//復(fù)用推挽輸出
????GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;
????GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
????GPIO_Init(GPIOA,&GPIO_InitStruct);
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????//接收引腳
????GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;//上拉輸入
????GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;
????GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
????GPIO_Init(GPIOA,&GPIO_InitStruct);
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3.?配置UART結(jié)構(gòu)體
//配置USART參數(shù)
????USART_InitTypeDef USART_InitStruct;
????USART_InitStruct.USART_BaudRate = 9600;
????USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
????USART_InitStruct.USART_Mode = USART_Mode_Tx|USART_Mode_Rx;
????USART_InitStruct.USART_Parity = USART_Parity_No;
????USART_InitStruct.USART_StopBits = USART_StopBits_1;
????USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_Init(USART1,&USART_InitStruct);
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4.?中斷接收，配置中斷參數(shù)
//串口USART_IT_RXNE位（接收移位寄存器） 置1 觸發(fā)中斷
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
//配置NVIC
????NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//優(yōu)先級(jí)分組
????NVIC_InitTypeDef NVIC_InitStruct;
????NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn;
????NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
????NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1;
????NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;
NVIC_Init(&NVIC_InitStruct);
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5.串口使能（上電）
????USART_Cmd(USART1,ENABLE);
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