來源: 野火<零死角玩轉STM32-F407> 407USART2—USART2接發(fā)
//中斷 _it.c
extern uint8_t Rxflag;
extern uint8_t ucTemp;
void RS232_USART_IRQHandler(void)
{
if(USART_GetITStatus( RS232_USART, USART_IT_RXNE ) != RESET)
{
Rxflag=1;
ucTemp = USART_ReceiveData( RS232_USART );
}
}
====================
//引腳定義
/*******************************************************/
#define RS232_USART USART2
#define RS232_USART_CLK RCC_APB1Periph_USART2
#define RS232_USART_RX_GPIO_PORT GPIOA
#define RS232_USART_RX_GPIO_CLK RCC_AHB1Periph_GPIOA
#define RS232_USART_RX_PIN GPIO_Pin_3
#define RS232_USART_RX_AF GPIO_AF_USART2
#define RS232_USART_RX_SOURCE GPIO_PinSource3
#define RS232_USART_TX_GPIO_PORT GPIOA
#define RS232_USART_TX_GPIO_CLK RCC_AHB1Periph_GPIOA
#define RS232_USART_TX_PIN GPIO_Pin_2
#define RS232_USART_TX_AF GPIO_AF_USART2
#define RS232_USART_TX_SOURCE GPIO_PinSource2
#define RS232_USART_IRQHandler USART2_IRQHandler
#define RS232_USART_IRQ USART2_IRQn
/************************************************************/
//串口波特率
#define RS232_USART_BAUDRATE 115200 //25M晶體 在8M上面實際波特率38400 可以(實際36864)
==========================
/**
* @brief 配置嵌套向量中斷控制器NVIC
* @param 無
* @retval 無
*/
static void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure one bit for preemption priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
/* 配置中斷源 */
NVIC_InitStructure.NVIC_IRQChannel = RS232_USART_IRQ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/**
* @brief RS232_USART GPIO 配置,工作模式配置。115200 8-N-1 ，中斷接收模式
* @param 無
* @retval 無
*/
void Debug_USART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_AHB1PeriphClockCmd( RS232_USART_RX_GPIO_CLK|RS232_USART_TX_GPIO_CLK, ENABLE);
/* 使能 UART 時鐘 */
RCC_APB1PeriphClockCmd(RS232_USART_CLK, ENABLE);
/* 連接 PXx 到 USARTx_Tx*/
GPIO_PinAFConfig(RS232_USART_RX_GPIO_PORT,RS232_USART_RX_SOURCE, RS232_USART_RX_AF);
/* 連接 PXx 到 USARTx__Rx*/
GPIO_PinAFConfig(RS232_USART_TX_GPIO_PORT,RS232_USART_TX_SOURCE,RS232_USART_TX_AF);
/* 配置Tx引腳為復用功能 */
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = RS232_USART_TX_PIN ;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(RS232_USART_TX_GPIO_PORT, &GPIO_InitStructure);
/* 配置Rx引腳為復用功能 */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = RS232_USART_RX_PIN;
GPIO_Init(RS232_USART_RX_GPIO_PORT, &GPIO_InitStructure);
/* 配置串口RS232_USART 模式 */
USART_InitStructure.USART_BaudRate = RS232_USART_BAUDRATE;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(RS232_USART, &USART_InitStructure);
NVIC_Configuration();
/*配置串口接收中斷*/
USART_ITConfig(RS232_USART, USART_IT_RXNE, ENABLE);
USART_Cmd(RS232_USART, ENABLE);
}
/***************** 發(fā)送一個字符 **********************/
static void Usart_SendByte( USART_TypeDef * pUSARTx, uint8_t ch )
{
/* 發(fā)送一個字節(jié)數據到USART1 */
USART_SendData(pUSARTx,ch);
/* 等待發(fā)送完畢 */
while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);
}
/***************** 指定長度的發(fā)送字符串 **********************/
void Usart_SendStr_length( USART_TypeDef * pUSARTx, uint8_t *str,uint32_t strlen )
{
unsigned int k=0;
do
{
Usart_SendByte( pUSARTx, *(str + k) );
k++;
} while(k < strlen);
}
/***************** 發(fā)送字符串 **********************/
void Usart_SendString( USART_TypeDef * pUSARTx, uint8_t *str)
{
unsigned int k=0;
do
{
Usart_SendByte( pUSARTx, *(str + k) );
k++;
} while(*(str + k)!='