请教大家一个SD卡FAT文件换行存储的问题

C919WAY · 发表于 2019-6-6 11:43:02

本帖最后由 C919WAY 于 2019-6-6 11:44 编辑

代码如下，但是我每次换行存储的时候就存成了这样，第二行总是右移一些，不知道是为什么？
#include <string.h>
#include "led.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "lcd.h"
#include "key.h"
#include "usmart.h"
#include "malloc.h"
#include "MMC_SD.h"
#include "ff.h"
#include "exfuns.h"
#include "fattester.h"

FIL fil;
FRESULT res;
UINT bww;

int main(void)
{
      //FILE *fp;
      u16 TDS;
float PH;
u8 soilhum;
u16 light;
u8 temp;
u8 airhum;
u16 TDS1;
float PH1;
u8 soilhum1;
u16 light1;
u8 temp1;
u8 airhum1;
char bufchar[100];
      u32 total,free;
      u8 t=0;
      u8 i;
  TDS=1300;
  PH=6.5;
soilhum=30;
light=3000;
temp=18;
airhum=40;
TDS1=1400;
PH1=6.8;
soilhum1=20;
light1=2000;
temp1=19;
airhum1=45;

      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// éèÖÃÖD¶ÏóÅÏè¼¶·Ö×é2
      delay_init();                   //Ñóê±oˉêy3õê¼»ˉ
      uart_init(9600);                //′®¿ú3õê¼»ˉÎa9600
      exfuns_init();             //ÎafatfsÏà1Ø±äá¿éêÇëÄú′æ
      LCD_Init();                      //3õê¼»ˉòo¾§
      LED_Init();       //LED3õê¼»ˉ
      //usmart_dev.init(72);
      mem_init();                      //3õê¼»ˉÄú′æ3Ø

      POINT_COLOR=RED;//éèÖÃ×ÖìåÎaoìé«
      LCD_ShowString(60,50,200,16,16,"Mini STM32");
      LCD_ShowString(60,70,200,16,16,"FATFS TEST");
      LCD_ShowString(60,90,200,16,16,"ATOM@ALIENTEK");
      LCD_ShowString(60,110,200,16,16,"Use USMART for test");
      LCD_ShowString(60,130,200,16,16,"2014/3/14");

      while(SD_Initialize())                                     //¼ì2aSD¿¨
      {
            LCD_ShowString(60,150,200,16,16,"SD Card Error!");
            delay_ms(200);
            LCD_Fill(60,150,240,150+16,WHITE);//Çå3yÏÔê¾
            delay_ms(200);
            LED0=!LED0;//DS0éáË¸
      }
      exfuns_init();                                                       //ÎafatfsÏà1Ø±äá¿éêÇëÄú′æ
      f_mount(fs[0],"0:",1);                                        //1òÔØSD¿¨
      //f_mount(fs[1],"1:",1);                                        //1òÔØFLASH.
      while(exf_getfree("0",&total,&free))       //μÃμ½SD¿¨μÄ×üèYá¿oíê￡óàèYá¿
      {
            LCD_ShowString(60,150,200,16,16,"Fatfs Error!");
            delay_ms(200);
            LCD_Fill(60,150,240,150+16,WHITE);//Çå3yÏÔê¾
            delay_ms(200);
            LED0=!LED0;//DS0éáË¸
      }
      POINT_COLOR=BLUE;//éèÖÃ×ÖìåÎaà¶é«
      LCD_ShowString(60,150,200,16,16,"FATFS OK!");
      LCD_ShowString(60,170,200,16,16,"SD Total Size:    MB");
      LCD_ShowString(60,190,200,16,16,"SD  Free Size:    MB");
      LCD_ShowNum(172,170,total>>10,5,16);                                     //ÏÔê¾SD¿¨×üèYá¿ MB
      LCD_ShowNum(172,190,free>>10,5,16);                                              //ÏÔê¾SD¿¨ê￡óàèYá¿ MB

  mf_mount(0,1);//×￠2á

  f_open(&fil,"0:/1.txt", FA_OPEN_ALWAYS|FA_WRITE);
      sprintf((char*)bufchar,"TDS:%d,PH:%.1f,soilhum:%d%%,light:%d,temp:%d,airhum:%d%% \r\n",TDS,PH,soilhum,light,temp,airhum);
      f_lseek (&fil,f_size (&fil));
      f_write (&fil,bufchar,sizeof(bufchar),&bww);
      f_close (&fil);
      memset(bufchar,0,100);

      delay_ms(500);

      f_open(&fil,"0:/1.txt", FA_WRITE);
      sprintf((char*)bufchar,"TDS:%d PH:%.1f soilhum:%d%% light:%d temp:%d airhum:%d%% \r\n",TDS1,PH1,soilhum1,light1,temp1,airhum1);
      f_lseek(&fil,f_size(&fil));
      f_write(&fil,bufchar,sizeof(bufchar),&bww);
      f_close(&fil);
      memset(bufchar,0,100);

      while(1)
      {
            t++;
            delay_ms(200);
            LED0=!LED0;
      }
}

这是TXT文件显示的结果
TDS:1300,PH:6.5,soilhum:30%,light:3000,temp:18,airhum:40%
                              ̛   TDS:1400 PH:6.8 soilhum:20% light:2000 temp:19 airhum:45%

附件中我也附加了代码，请高手帮忙看看

yklstudent · 发表于 2019-6-6 11:48:36

sizeof(bufchar)用的有问题，换成strlen试试

C919WAY · 发表于 2019-6-6 11:50:18

好的，我试一下，谢谢高手

C919WAY · 发表于 2019-6-6 11:54:41

按高手的指点已经解决，真的是谢谢啦！！！

C919WAY · 发表于 2019-6-6 12:18:03

还有请教您们一下，比如我想存蛮多参数值，是像我这样写，一次生成一个有蛮多参数的字符数组
f_open(&fil,"0:/1.txt", FA_OPEN_ALWAYS|FA_WRITE);
      sprintf((char*)bufchar,"TDS:%d,PH:%.1f,soilhum:%d%%,light:%d,temp:%d,airhum:%d%% \r\n",TDS,PH,soilhum,light,temp,airhum);
      f_lseek (&fil,f_size (&fil));
      f_write (&fil,bufchar,sizeof(bufchar),&bww);
      f_close (&fil);
      memset(bufchar,0,100);
再存取

还是每次写一个参数存好几次，比如这样：
f_open(&fil,"0:/1.txt",FA_WRITE);
sprintf((char*)bufchar,"light:%-1d",light);
f_lseek (&fil,f_size (&fil));
f_write (&fil,bufchar,strlen(bufchar),&bww);
f_close (&fil);
memset(bufchar,0,20);

f_open(&fil,"0:/1.txt",FA_WRITE);
sprintf((char*)bufchar,"temp:%-1d",temp);
f_lseek (&fil,f_size (&fil));
f_write (&fil,bufchar,strlen(bufchar),&bww);
f_close (&fil);
memset(bufchar,0,20);

f_open(&fil,"0:/1.txt",FA_WRITE);
sprintf((char*)bufchar,"airhum:%-1d%%",airhum);
f_lseek (&fil,f_size (&fil));
f_write (&fil,bufchar,strlen(bufchar),&bww);
f_close (&fil);
memset(bufchar,0,20);

自我感觉第一个方法比较费内存，第二个方法比较折腾，而且第二种方法参数之间的空格不好把握，请高手指点一下，谢谢啦

人去搂空 · 发表于 2019-6-6 13:11:52

谢谢分享！

梦回007 · 发表于 2019-8-2 14:55:29

C919WAY 发表于 2019-6-6 11:54
按高手的指点已经解决，真的是谢谢啦！！！

请教一下楼主，如何数出来文件中数据的行数呀

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请教大家一个SD卡FAT文件换行存储的问题

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