printf 输出第一个字节丢失

v8266

我用迷你板，3.5的库，输出printf("dmp_enable_feature complete ......\n");

串口接收到的数据是 mp_enable_feature complete ......    （少了第一个字节）
然后我百度看了别人给的解决方法，试了，但还是一样。
一个晚上弄这个还没弄好。求助！

八度空间

贴移植底层代码

v8266

回复【2楼】Badu_Space:
---------------------------------
#include "sys.h"
#include "usart.h"
#include "delay.h"

//********************************************************************************
//V1.3???????÷ 
//?§???????????????????????¨?????è??.
//????????printf???§??
//???????????????ü??????.
//??????printf??????×?·????§??bug
//////////////////////////////////////////////////////////////////////////////////    


//?????????ú??,?§??printf????,?????è??????use MicroLIB
#if 1
#pragma import(__use_no_semihosting)             
//±ê×????è?????§??????                 
struct __FILE 
{ 
int handle; 
}; 

FILE __stdout;       
//?¨??_sys_exit()??±???????°??÷?ú????    
_sys_exit(int x) 
{ 
x = x; 
} 
//???¨??fputc???? 
int fputc(int ch, FILE *f)
{ 
while((USART1->SR&0X40)==0);//???··???,?±??·????ê±?   
    USART1->DR = (u8) ch;      
return ch;
}
#endif 

/*????microLib??·?·¨*/
/* 
int fputc(int ch, FILE *f)
{
USART_ClearFlag(USART1,USART_FLAG_TC); 
USART_SendData(USART1, (uint8_t) ch);
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
return ch;
}

int GetKey (void)  
{ 
while (!(USART1->SR & USART_FLAG_RXNE));
return ((int)(USART1->DR & 0x1FF));
}
*/
 
u8 USART_RX_BUF[64];     //????????,×??ó64??×???.
//????×???
//bit7???????ê??±ê??
//bit6????????0x0d
//bit5~0?????????????§×???????
u8 USART_RX_STA=0;       //????×???±ê??

void uart_init(u32 bound)
{
    //GPIO?????è??
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
 
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);
//USART1_TX   A.9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//USART1_RX   A.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);  

   //Usart1 NVIC ????

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?¨??????
NVIC_Init(&NVIC_InitStructure); //?ù??NVIC_InitStruct?????¨???????????????èNVIC?????÷USART1
  
   //USART ???????è??
   
USART_InitStructure.USART_BaudRate = bound;//??°??è????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(USART1, &USART_InitStructure);

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//????????

USART_Cmd(USART1, ENABLE);                    //???????? 
}

void USART1_IRQHandler(void)                 //????1????·??????ò
{
u8 Res;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //????????(????????????±?????0x0d 0x0a?á??)
{
Res =USART_ReceiveData(USART1);//(USART1->DR); //????????????????

if((USART_RX_STA&0x80)==0)//???????ê??
{
if(USART_RX_STA&0x40)
{
if(Res!=0x0a)USART_RX_STA=0;
else USART_RX_STA|=0x80;
}
else 
{
if(Res==0x0d)USART_RX_STA|=0x40;
else
{
USART_RX_BUF[USART_RX_STA&0X3F]=Res ;
USART_RX_STA++;
if(USART_RX_STA>63)USART_RX_STA=0;
}  
}
}
 } 
} 

void rintChar(char *s)
{
char *p;
p=s;
while(*p != '\0')
{
UsartSend(*p);
p++;
}
}
void UsartSend(u16 ch)
{
USART_ClearFlag(USART1,USART_FLAG_TC); 
USART1->DR = (ch&(u16)0x01FF); 
while((USART1->SR&0X40)==0);
   
}



就是mini板自带的代码，没有什么修改的