无法创建文件的问题

牛奋 · 发表于 2015-2-1 22:00:09

int main(void)
{
SystemInit();
delay_init(72); //???±??????
NVIC_Configuration();
uart_init(9600); //?®????????
LED_Init(); //LED??????????
EXTIX_Init(); //??????????????

MYDMA_Config(DMA1_Channel5,(u32)&USART1->DR,(u32)ReceiveBuff,200);
//DMA1?¨??5,???è??SendBuff,?????÷???®??1,?¤????????.

printf("\r\n ????????SD?¨?????é(FATFS R0.08)\n");
while(1)
{
if(flag == 1)
{
flag = 0;
printf ( "\r\n disk_initialize starting......\n " );

res = f_mount(0,&fs);
printf("%d",res); //?®????????0??
Create_files(); //res = f_open(&fdst,(TCHAR *)string0,FA_CREATE_NEW | FA_WRITE);
if( res == FR_OK )
{
LED1_ON;
printf("??%d?????????¨????",file_num);

//res = f_write(&fdst, trs, sizeof(trs), &bw);
Write_file();
}
}
// else if(flag == 2)
// {
// flag = 0;
// DMA_Cmd(DMA1_Channel5, DISABLE ); //??±?USART1 RX DMA1 ?ù???????¨??
// f_close(&fdst); /*??±????? */
// LED1_OFF;
// }
}
}

void EXTI15_10_IRQHandler(void)
{
delay_ms(10); //????

if(EXTI_GetITStatus(EXTI_Line13) != RESET)
{
flag = 1;
}
else if (EXTI_GetITStatus(EXTI_Line15) != RESET)
{
flag = 2;
}
EXTI_ClearITPendingBit(EXTI_Line13); //????EXTI13±ê????
EXTI_ClearITPendingBit(EXTI_Line15); //????EXTI15±ê????
}

void Create_files(void)
{
char string0[25]={"0:/DATA_"}; //
char string1[15]={" "}; //
char string2[5]={".txt"};
do
{
file_num++;
convert(string1,file_num);
strcat(string0,string1);
strcat(string0,string2); //??????????string0??
res = f_open(&fdst,(TCHAR *)string0,FA_CREATE_NEW | FA_WRITE);
} while( res == FR_EXIST );
}

void Write_file(void)
{
printf("\nwrite file begining\n");

USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE); //?????®??1??DMA????
MYDMA_Enable(DMA1_Channel5); //????DMA??????
while(1)
{
if(DMA_GetFlagStatus(DMA1_FLAG_TC5) == SET)//?????¨??5?????ê??
{
//printf("%s\n",ReceiveBuff);
if(flag == 2)
{
flag = 0;
DMA_Cmd(DMA1_Channel5, DISABLE ); //??±?USART1 RX DMA1 ?ù???????¨??
f_close(&fdst); /*??±????? */
LED1_OFF;
}
DMA_ClearFlag(DMA1_FLAG_TC5); //????·????ê??±ê??
res = f_write(&fdst, ReceiveBuff, sizeof(ReceiveBuff), &bw);
/* ?????????????????????? */
printf("\n write file done!");//?á???????ê??

}
}

}

额，注释竟然是乱码，，，各位道友，我先说一下程序的思路，初始化后等待按键中断，key0按下时置flag为1，主程序依次执行
flag = 0;
printf ( "\r\n disk_initialize starting......\n " );
res = f_mount(0,&fs);
printf("%d",res);
Create_files(); //res = f_open(&fdst,(TCHAR *)string0,FA_CREATE_NEW | FA_WRITE);
if( res == FR_OK )
{
LED1_ON;
printf("??%d?????????¨????",file_num);
  Write_file();
}
奇怪的现象发生了，程序只执行到   printf("%d",res); 打印的结果为0，但却无法建立文件，接着按按键连续十几次都是这种情况，（有几次成功建立了文件是按了大概十几次这样）这坑是什么问题？