STM32L151 usart2 串口2 程序

2019-6-12 15:57

原文：https://blog.csdn.net/aixin2012/article/details/78518225

void USART2_config(unsigned int BaudRate)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_InitTypeDef USART_InitStructure;

/* Enable the USART2 Pins Software Remapping */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

/* Configure USART2 Rx (PA.03) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
//GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Configure USART2 Tx (PA.02) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
//GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Enable the USART2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

USART_InitStructure.USART_BaudRate = 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(USART2, &USART_InitStructure);
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
//USART_ITConfig(USART2, USART_IT_TXE, ENABLE);
/* Enable USART2 */
USART_Cmd(USART2, ENABLE);

USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2);
}

2019-6-12 15:57

void USART2_IRQHandler(void)
{
unsigned char temp=0;

if(USART_GetITStatus(USART2,USART_IT_RXNE)!=RESET)
{
temp=USART_ReceiveData(USART2);
USART_ClearFlag(USART2,USART_FLAG_RXNE);

usart2_race_buf[usart2_race_count] = temp;
usart2_race_count++;
if(usart2_race_count>=2)
{
usart2_race_count = 0;
usart2_race_over = 1;
}
}
}

2019-6-12 15:58

void USART2_send_all(unsigned char *byte,unsigned char send_mun)
{
unsigned char i;

for(i=0;i<send_mun;i++)
{
USART_SendData(USART2,*byte);
byte++;

while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET){}
}
}

2019-7-4 16:54

非常不错的代码

2019-7-5 11:09

木木guainv 发表于 2019-7-4 16:54
非常不错的代码

非常感谢支持

2020-8-24 15:41

学习一下，最近用到

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STM32L151 usart2 串口2 程序