interface SD Card using SPI communication in stm32f103c8 [duplicate]

Question

I need to interface SD Card using SPI communication in stm32f103c8. First i to store the temprature value in every one seconds in sd card. It work well after that i try to store temperature value in that i need to erase the previous data and store the new temperature data. I have done the code but i only erase the data and it did not store the last updated temperature value please let me know where it went wrong.

my code.

#include "main.h"
#include "fatfs.h"
#include "math.h"
#include "fatfs_sd.h"
#include "string.h"
#include "stm32f1xx_hal.h"
#include "stdio.h"
#include "ssd1306.h"
#include "fonts.h"

#define CMD32 32
#define CMD33 33

FATFS fs;
FATFS *pfs;
FIL fil;
FRESULT fresult;
FILINFO fno;
uint8_t erase_cmd[6]={0x20, 0x00, 0x00, 0x00, 0x00, 0x95};
uint8_t status;
uint8_t SD_tx_buf[6];
uint8_t SD_rx_buf[6];

uint16_t adc_buf[100];
char buffer[100];
UINT br,bw;


FRESULT open_append(FIL* fp, const char* path);   // object file create, file name to open
FRESULT open_append(FIL* fp, const char* path)
{   
    fresult = f_open(fp, path, FA_WRITE | FA_READ | FA_OPEN_ALWAYS);  // new file create
    
       if(fresult==0)
         {
             fresult= f_lseek(fp, f_size(fp));  // seek to end of the file to append data
                 if(fresult !=0)
                         f_close(fp);
         }
         return fresult;
}

int main(void)
{

  HAL_Init();


  SystemClock_Config();


  MX_GPIO_Init();
  MX_ADC1_Init();
  MX_I2C1_Init();
  MX_RTC_Init();
  MX_SPI1_Init();
  MX_TIM1_Init();
  MX_USART1_UART_Init();
  MX_FATFS_Init();

     set_time();      // time set function


           fresult= disk_initialize(0);       //initialize sd card      **** SD Card Create File ****
             fresult= f_mount(&fs, (TCHAR const*)arr,0); 
           if(fresult != FR_OK)
             {
                return fresult;
             }
        
        fresult= f_open(&fil, "Temp_Read1.txt", FA_OPEN_ALWAYS);  //create text file
          fresult= f_mount(&fs, (TCHAR const*)arr, 0);
          fresult= open_append(&fil, "Temp_Read1.txt");
            if(fresult == FR_OK)
                {
          f_puts("time\t  Temp\n", &fil);
              f_close(&fil);
                }  
                
/**************************************************************************************************************************************************************/        
    
//                      NVIC_SystemReset();        // INTERNALLY_RESET
                                for(i=0; i<100; i++)
                        {
                                 HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_RESET);  /********Erase_cmd********    ****Working****/
                     
                                 HAL_SPI_Transmit(&hspi1, erase_cmd, sizeof(erase_cmd), HAL_MAX_DELAY);

                                 HAL_SPI_Receive(&hspi1, &status, 1, HAL_MAX_DELAY);
                                 
                                 HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_SET);  HAL_Delay(10);
                        }


  while (1)
  {
    HAL_RTC_GetTime(&hrtc, &sTime, RTC_FORMAT_BIN);
      HAL_RTC_GetDate(&hrtc, &sDate, RTC_FORMAT_BIN);              // RTC_TIME
        
        hours= sTime.Hours;
        mins=  sTime.Minutes;
        sec =   sTime.Seconds;
                

        ADC_sense();
        
        sprintf(buff, "%d:%d:%d\t  T1=%d,  T1=%d,  T1=%d,  T1=%d,  T1=%d\n", hours,mins,sec, temp1,temp2,temp3,temp4,temp5);        // values stored in SD card
        
        f_mount(&fs, (TCHAR const*)arr, 0);    //mount sd drive      **** SD Card Read Condition ****
                                              
           fresult= open_append(&fil, "Temp_Read1.txt");
//      if(sec==59)                                  // one min once temp data store
//          {    
    //  count_p++; i++;
            if(fresult == FR_OK)
                        {
                   f_puts(buff, &fil);                    // values stored at SD card

                   f_close(&fil);
                            

                        while(1){   };
                        }   
}}