USART程序问题

lwz8771728

#include "stm32f10x_lib.h"

#include "stdio.h"

ErrorStatus HSEStartUpStatus;//errorstatus是一种数据类型，在固件库里面有，是布尔0/1

void RCC_Configuration(void);

void NVIC_Configuration(void);

void GPIO_Configuration(void);

void USART_Configuration(void);

int main(void)

{

  u16 i=0;

#ifdef DEBUG

debug();

#endif

RCC_Configuration();

NVIC_Configuration();

GPIO_Configuration();

USART_Configuration();

printf("please input  charter from keyboard\n") ;//printf可直接从串口输出

while(1)

{

if(USART_GetFlagStatus(USART1,USART_IT_RXNE)==SET)//SET表示1的意思，RESET表示0.即RXNE不为空时，可以取数据 IT_RXNE还是FLAG_RXNE？

{

i=USART_ReceiveData(USART1);

printf("%c",i&0xFF);//???

}

}

}

//=========================RCC_Configuration=================

void RCC_Configuration(void)

{

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA,ENABLE);

}

//=======================NVIC_Configuration===================

void NVIC_Configuration(void)

{

#ifdef VECT_TAB_RAM

NVIC_SetVectorTable(NVIC_VcetTab_RAM,0x0);

#else

NVIC_SetVectorTable(NVIC_VectTab_FLASH,0x0);

#endif

}

//=======================GPIO_Configuration===================

void GPIO_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA,&GPIO_InitStructure);

}

//========================USART_Configuration=======================

void USART_Configuration(void)

{

USART_InitTypeDef USART_InitStructure;

USART_InitStructure.USART_BaudRate=115200;

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_InitStructure.USART_Clock=USART_Clock_Disable;

USART_InitStructure.USART_CPOL=USART_CPOL_Low;

USART_InitStructure.USART_CPHA=USART_CPHA_2Edge;

USART_InitStructure.USART_LastBit=USART_LastBit_Disable;

USART_Init(USART1,&USART_InitStructure);

USART_Cmd(USART1,ENABLE);

}

int fputc(int ch,FILE *f)

{

USART_SendData(USART1,(u8)ch);

while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET)

{

}

return ch;

}

#ifdef DEBUG

void assert_failed(u8* file,u32 line)

{

}

#endif

程序如上了。我在编译的时候出现了usart.axf: Error: L6218E: Undefined symbol assert_failed (referred from stm32f10x_gpio.o).，怎么解决呀，请各位大侠指教

lwz8771728

算是解决了，在C/C++的define加入DEBUG就可以了，但我还是不太了解原因，有人指点下就好了

正点原子

回复【楼主位】lwz8771728:
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