UART接收发送数据:
平台:STM32F401 discovery版
此代码用的UART6,TX,RX对应的PIN脚是PC6,PC7
如图:
代码如下:
步骤一:初始化串口的GPIO,USART,并且配置上UART的RX中断
void USART6_Config(void)
{
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIO clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC , ENABLE);
/* Enable USART clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART6, ENABLE);
/* Connect USART pins to */
GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_USART6);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_USART6);
/* Configure USART Tx and Rx as alternate function push-pull */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz ; //GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* USARTx configuration ----------------------------------------------------*/
USART_InitStructure.USART_BaudRate = 115200 ; //5250000;
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(USART6, &USART_InitStructure);
/* Enable the USARTx Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART6_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART6, USART_IT_RXNE, ENABLE);
USART_Cmd(USART6, ENABLE);
}
步骤二:测试一下TX,即用printf,但是printf内部是调用fputs,所以需要重定向一下
int fputc(int ch, FILE *f)
{
USART_SendData(USART6, (unsigned char) ch);
while (!(USART6->SR & USART_FLAG_TXE));
return (ch);
}
int fgetc(FILE *f)
{
while (USART_GetFlagStatus(USART6, USART_FLAG_RXNE) == RESET);
return (int)USART_ReceiveData(USART6);
}
步骤三:编写RX中断函数
[cpp] view plain copy
void USART6_IRQHandler(void)
{
uint8_t ch;
if(USART_GetITStatus(USART6, USART_IT_RXNE) != RESET)
{
ch = USART_ReceiveData(USART6);
printf( "%c\n", ch );
}
}
注意地方:使用的IAR,冲定向的时候出现FILE类型找不到,可是在C原因中#include
追代码发现:
#if _DLIB_FILE_DESCRIPTOR
typedef _Filet FILE;
#endif /* _DLIB_FILE_DESCRIPTOR */
_DLIB_FILE_DESCRIPTOR宏是0,但是IAR又不让修改,所以肯定是哪里的lib没有配置,于是找到如图就搞定了
附一张板子图:
用标准的杜邦线连接
整个工程如连接:
http://download.csdn.net/detail/xiaoxiaopengbo/9425422
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推荐阅读最新更新时间:2024-03-16 15:37