利用FATFS往SD卡里写入float型的数据无法写入

13155489372 · 发表于 2018-1-2 09:51:36

FIL fnew;
FRESULT res_sd;
UINT fnum;
BYTE ReadBuffer[1024]={0};       //BYTE 为unsigned char

u8 i=0;
u32 free,total;
                                                                                                      //unsigned char temp0[400]={48,49,50,51,52,53,54,55,56,57,58};       //ASCII  码1到9 可以正常写入
float  temp0[400]={48,49,50,51,52,53,54,55,56,57,58}; // 写入float型的数据时，无法生成  .txt 文件
SysTick_Init(72);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
LED_Init();
USART1_Init(9600);
TFTLCD_Init();

EN25QXX_Init();
my_mem_init(SRAMIN);

FRONT_COLOR=RED
LCD_ShowString(10,10,tftlcd_data.width,tftlcd_data.height,16,"PRECHIN STM32F1");
LCD_ShowString(10,30,tftlcd_data.width,tftlcd_data.height,16,"FatFs Test");
LCD_ShowString(10,50,tftlcd_data.width,tftlcd_data.height,16,"www.prechin.net");

while(SD_Init())//¼ì2a2»μ½SD¿¨
{
LCD_ShowString(10,100,tftlcd_data.width,tftlcd_data.height,16,"SD Card Error!");
printf("SD Card Error!\r\n");
delay_ms(500);
}

可以写入unsigned char 型的数据，无法写入float 型的数据

13155489372 · 发表于 2018-1-2 09:55:17

res_sd = f_open(&fnew, "0:FatFs2¶áD′2aêÔÎÄ¼t.txt",FA_CREATE_ALWAYS | FA_WRITE );
if ( res_sd == FR_OK )
{

res_sd=f_write(&fnew,temp0,sizeof(temp0),&fnum); 我是这样写的