STM32 UART串列埠驅動程式
文章原始地址: http://feotech.com/?p=56
示例1.通過UART1進行資料傳送
UART 1 的初始化
/** * @brief UART1 Initialise. * @param None. * @retval None. */ void UART1_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //UART1 選擇對應UART的RCC時鐘 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //選擇串列埠對應引腳的RCC時鐘 //UART1_TX GPIOA_Pin_9 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //GPIOC_Pin_9 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // GPIO_Init(GPIOA, &GPIO_InitStructure); // //UART1_RX GPIOA_Pin_10 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //GPIOA_Pin_10 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); //UART1通訊引數配置 USART_InitStructure.USART_BaudRate = 115200; //通訊波特率 USART_InitStructure.USART_WordLength = USART_WordLength_8b; //8個數據位 USART_InitStructure.USART_StopBits = USART_StopBits_1; //1個停止位 USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; // USART_Init(USART1, &USART_InitStructure); USART_Cmd(USART1, ENABLE); }
將資料0xBA通過UART1傳送出
USART_SendData(USART1,0xBA); //Send Data 0xBA
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示例2.通過對UART1進行接收中斷配置,收到外部資料後進入中斷讀取資料
UART 1 的初始化 開啟接收中斷
/**
-
@brief UART1 Initialise.
-
@param None.
-
@retval None.
-
@brief Data transfer PC
*/
void UART1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //UART1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); ////UART1_TX GPIOA_Pin_9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //GPIOC_Pin_9
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //
GPIO_Init(GPIOA, &GPIO_InitStructure); ////UART1_RX GPIOA_Pin_10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //GPIOA_Pin_10
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);//UART1通訊引數配置
USART_InitStructure.USART_BaudRate = 115200; //通訊波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //8個數據位
USART_InitStructure.USART_StopBits = USART_StopBits_1; //1個停止位
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //
USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; //
USART_Init(USART1, &USART_InitStructure);//Uart1 NVIC 中斷配置
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //資料接收中斷使能
NVIC_Init(&NVIC_InitStructure);USART_Cmd(USART1, ENABLE);
}
中斷入口函式,變數rxdat用於存放接收到的1個位元組資料
void USART1_IRQHandler(void)
{
unsigned char rxdat ;
if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
USART_ClearITPendingBit(USART1, USART_IT_RXNE); //Clear flag
rxdat = USART_ReceiveData(USART1);
}
}