蓝桥杯嵌入式组开发——USART
初始化时钟， 中断 对RX(A3),TX(A2)口进行配置 USART配置 中断使能 打开总开关
1.初始化代码
void USART_INIT(void)
{
USART_InitTypeDef USART_InitStructure
;
GPIO_InitTypeDef GPIO_InitStructure
;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA
, ENABLE
);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2
, ENABLE
);
NVIC_Configuration_USART();
GPIO_InitStructure
.GPIO_Pin
= GPIO_Pin_3
;
GPIO_InitStructure
.GPIO_Speed
= GPIO_Speed_50MHz
;
GPIO_InitStructure
.GPIO_Mode
= GPIO_Mode_IN_FLOATING
;
GPIO_Init(GPIOA
, &GPIO_InitStructure
);
GPIO_InitStructure
.GPIO_Pin
= GPIO_Pin_2
;
GPIO_InitStructure
.GPIO_Mode
= GPIO_Mode_AF_PP
;
GPIO_Init(GPIOA
, &GPIO_InitStructure
);
USART_InitStructure
.USART_BaudRate
= 9600;
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_Cmd(USART2
,ENABLE
);
}
2.发送数据函数
void Usart_SendString(char *str
)
{
char index
= 0;
do{
USART_SendData(USART2
, str
[index
]);
while(USART_GetFlagStatus(USART2
, USART_FLAG_TXE
) == 0);
index
++;
}
while(str
[index
] != 0 );
USART_SendData(USART2
, '\n');
}
3.中断接收函数
void USART2_IRQHandler(void)
{
uint8_t temp
;
if(USART_GetITStatus(USART2
,USART_IT_RXNE
) != RESET
){
USART_ClearITPendingBit(USART2
,USART_IT_RXNE
);
temp
= USART_ReceiveData(USART2
);
if((temp
== 'x') || (RXCUNT
== 20))
{
RXCUNT
= 0;
RXOVER
= 1;
USART_ITConfig(USART2
,USART_IT_RXNE
,DISABLE
);
}
else{
USART_RXBUF
[RXCUNT
] = temp
;
++RXCUNT
;
}
}
}
4.参考库函数
STM32_MCU\stm32f10x_stdperiph_lib\STM32F10x_StdPeriph_Lib_V3.5.0\Project\STM32F10x_StdPeriph_Examples\USART\Interrupt
初始化参考： 中断接收数据函数参考如下： GPIO口配置参考： STM32_MCU\stm32f10x_stdperiph_lib\STM32F10x_StdPeriph_Lib_V3.5.0\Project\STM32F10x_StdPeriph_Examples\USART\HyperTerminal_HwFlowControl文件下的IO口配置
