STM32F401串口程序源码

Main.c

#include \#include \#include \#include \#include \#include \

int main(void) { u8 t; u8len; u16 times=0; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); delay_init(168); uart_init(115200); LED_Init(); while(1) { if(USART_RX_STA&0x8000) { len=USART_RX_STA&0x3fff;

printf(\输入字符为:\\r\\n\ for(t=0;t

} }

Usart.c

#include \#include \

#if SYSTEM_SUPPORT_OS #include \ #endif #if 1

#pragma import(__use_no_semihosting)

struct __FILE { int handle; };

FILE __stdout;

_sys_exit(int x) { x = x; }

intfputc(intch, FILE *f) { while((USART1->SR&0X40)==0); USART1->DR = (u8) ch; returnch; }

#endif

#if EN_USART1_RX

u8 USART_RX_BUF[USART_REC_LEN]; u16 USART_RX_STA=0;

voiduart_init(u32 bound){

GPIO_InitTypeDefGPIO_InitStructure; USART_InitTypeDefUSART_InitStructure; NVIC_InitTypeDefNVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA,&GPIO_InitStructure); USART_InitStructure.USART_BaudRate = bound; 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(USART1, &USART_InitStructure);

USART_Cmd(USART1, ENABLE); //USART_ClearFlag(USART1, USART_FLAG_TC);

#if EN_USART1_RX USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //Usart1 NVIC

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3; NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);

#endif }

void USART1_IRQHandler(void)

{ u8 Res;

#if SYSTEM_SUPPORT_OS OSIntEnter(); #endif if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) { Res =USART_ReceiveData(USART1);//(USART1->DR); if((USART_RX_STA&0x8000)==0) { if(USART_RX_STA&0x4000)// { if(Res!=0x0a)USART_RX_STA=0; else USART_RX_STA|=0x8000; } else { if(Res==0x0d)USART_RX_STA|=0x4000; else { USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ; USART_RX_STA++; if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0; } } } }

#if SYSTEM_SUPPORT_OS OSIntExit(); #endif }

#endif