把不同字节长度的数据写入SD卡文件系统中，偏移地址问题

阿拉丁涛 · 发表于 2015-10-21 13:10:25

我用例程往sd卡里面循环写入数据

[mw_shl_code=c,true]#include "led.h" #include "delay.h" #include "key.h" #include "sys.h" #include "lcd.h" #include "usart.h" #include "sram.h" #include "malloc.h" #include "string.h" #include "mmc_sd.h" #include "ff.h" #include "exfuns.h" #include "usmart.h" #include "fattester.h" #include "stdio.h" //ALIENTEK????STM32??·?°????é40 //FATFS ???é //?????§????www.openedv.com //?????????í??×????????????? u8 a[3]={1,4,2}; u8 Read_SD_buff[60]={51,55,54}; u8 buffer[12]; int main(void) { u32 total,free; u32 t=0; u16 i=0; u32 xx=0; delay_init(); //???±?????????? NVIC_Configuration(); //?è??NVIC????·?×é2:2??????????????2???ì???????? uart_init(9600); //?®??????????9600 LED_Init(); //LED?????????? LCD_Init(); //?????????§ KEY_Init(); //??????°??ü exfuns_init(); //??fatfs?à??±????ê?????? usmart_dev.init(72); mem_init(SRAMIN); //???????????????? POINT_COLOR=RED;//?è??×??????ì?? LCD_ShowString(60,50,200,16,16,"WarShip 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,"2012/9/18"); while(SD_Initialize()) //?ì??SD?¨ { LCD_ShowString(60,150,200,16,16,"SD Card Error!"); delay_ms(200); LCD_Fill(60,150,240,150+16,WHITE);//???????? delay_ms(200); LED0=!LED0;//DS0???? } exfuns_init(); //??fatfs?à??±????ê?????? f_mount(0,fs[0]); //????SD?¨ f_mount(1,fs[1]); //????FLASH. while(exf_getfree("0",&total,&free)) //????SD?¨??×??????????à???? { LCD_ShowString(60,150,200,16,16,"Fatfs Error!"); delay_ms(200); LCD_Fill(60,150,240,150+16,WHITE);//???????? delay_ms(200); LED0=!LED0;//DS0???? } while(mf_unlink("0://test1.txt")); //??????±? while(mf_open("0://test1.txt",0X04)); //???¨??±? while(mf_close()); //??±???±? while(1) { while(mf_open("0://test1.txt",0X02)); sprintf((char*)buffer, "%d",3456); for(i=0;i<60;i++){ xx=240*t+i*4; while(mf_write(buffer,3)); while(mf_lseek(xx)); } while(mf_write("\r\n",3)); while(mf_close()); t++; delay_ms(100); LED0=!LED0; } } [/mw_shl_code]

这样写入很多都是对的，但是当我写数据加长，偏移地址给大

[mw_shl_code=c,true]#include "led.h" #include "delay.h" #include "key.h" #include "sys.h" #include "lcd.h" #include "usart.h" #include "sram.h" #include "malloc.h" #include "string.h" #include "mmc_sd.h" #include "ff.h" #include "exfuns.h" #include "usmart.h" #include "fattester.h" #include "stdio.h" //ALIENTEK????STM32??·?°????é40 //FATFS ???é //?????§????www.openedv.com //?????????í??×????????????? u8 a[3]={1,4,2}; u8 Read_SD_buff[60]={51,55,54}; u8 buffer[12]; int main(void) { u32 total,free; u32 t=0; u16 i=0; u32 xx=0; delay_init(); //???±?????????? NVIC_Configuration(); //?è??NVIC????·?×é2:2??????????????2???ì???????? uart_init(9600); //?®??????????9600 LED_Init(); //LED?????????? LCD_Init(); //?????????§ KEY_Init(); //??????°??ü exfuns_init(); //??fatfs?à??±????ê?????? usmart_dev.init(72); mem_init(SRAMIN); //???????????????? POINT_COLOR=RED;//?è??×??????ì?? LCD_ShowString(60,50,200,16,16,"WarShip 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,"2012/9/18"); while(SD_Initialize()) //?ì??SD?¨ { LCD_ShowString(60,150,200,16,16,"SD Card Error!"); delay_ms(200); LCD_Fill(60,150,240,150+16,WHITE);//???????? delay_ms(200); LED0=!LED0;//DS0???? } exfuns_init(); //??fatfs?à??±????ê?????? f_mount(0,fs[0]); //????SD?¨ f_mount(1,fs[1]); //????FLASH. while(exf_getfree("0",&total,&free)) //????SD?¨??×??????????à???? { LCD_ShowString(60,150,200,16,16,"Fatfs Error!"); delay_ms(200); LCD_Fill(60,150,240,150+16,WHITE);//???????? delay_ms(200); LED0=!LED0;//DS0???? } while(mf_unlink("0://test1.txt")); //??????±? while(mf_open("0://test1.txt",0X04)); //???¨??±? while(mf_close()); //??±???±? while(1) { while(mf_open("0://test1.txt",0X02)); sprintf((char*)buffer, "%d",3456); for(i=0;i<60;i++){ xx=300*t+i*5; //偏移地址增加， while(mf_write(buffer,4)); //写入字节增大 while(mf_lseek(xx)); } while(mf_write("\r\n",3)); while(mf_close()); t++; delay_ms(100); LED0=!LED0; } } [/mw_shl_code]

偏移地址那里，偏移地址改大，就不对了，SD卡插到电脑上，前一段是对的，后面开始错位，最后就还乱码
请问，这是什么原因？？