STM32 printf问题
怎样老是呈现idenfier “FILE is Undefined”,问题出在哪啊？望指导，谢谢！
我程序代码装备如下：
#include “stm32f10x.h”
#include “stm32_eval.h”
#include
#ifdef __GNUC__
/* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
set to Yes) calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
int main(void)
{
SystemInit();
/* Enable GPIOA and USART1 clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);
USART1_GPIO_Configuration();
USART1_Configuration();
printf(“The is a example!” );
}
/*********************************装备USART1的GPIO口*************************************/
void USART1_GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// Configure USART1_Tx as alternate function push-pull
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);
// Configure USART1_Rx as input floating
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/************************************装备串口1参数***********************************/
void USART1_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_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
}
PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the USART */
USART_SendData(USART1, (uint8_t) ch);
/* Loop until the end of transmission */
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
{}
return ch;
}
========================================
因printf()之类的函数，运用了半主机形式。运用规范库会导致程序无法运转,以下是解决办法:
办法1.运用微库,由于运用微库的话,不会运用半主机形式.
办法2.依然运用规范库,在主程序增加下面代码:
#pragma import(__use_no_semihosting)
_sys_exit(int x)
{
x = x;
}
struct __FILE
{
int handle;
/* Whatever you require here. If the only file you are using is */
/* standard output using printf() for debugging, no file handling */
/* is required. */
};
/* FILE is typedef’ d in stdio.h. */
FILE __stdout;
这个办法的确解决问题。
首先要加上这句：#include
然后参加以下代码：
///////运用规范printf的串口字节发送重界说///////////
//第一步：
#ifdef __GNUC__
/* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
set to Yes) calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
//第二步：
#pragma import(__use_no_semihosting)
_sys_exit(int x)
{
x = x;
}
struct __FILE
{
int handle;
/* Whatever you require here. If the only file you are using is */
/* standard output using printf() for debugging, no file handling */
/* is required. */
};
/* FILE is typedef’ d in stdio.h. */
FILE __stdout;
//第三步：
//默许运用COM1
/**
* @briefRetargets the C library printf function to the USART.
* @paramNone
* @retval None
*/
PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the USART */
/* Loop until the end of transmission */
while (USART_GetFlagStatus(USART_COM1, USART_FLAG_TC) == RESET)
{}
USART_SendData(USART_COM1, (uint8_t) ch);
return ch;
}
////////////////////////////////////////////////////
