flash写入过多的数据时出现问题

ppp125

这是我的主函数，flash为W25Q128,  BMP_Pressure是我的传感器采集的数据，我把传感器的double类型数据拆分成几个字节的u8类型，当我W25QXX_Write((u8*)TEXT_Buffer_ZH,WriteAddr_ZH,2100);        写入的字节数大于2100时就会出现：第一个采集到的数据正常，第二个开始采集BMP_Pressure为0。小于2100时没有问题，但是我需要写入数据很多，无法写入
顺便问一下，为什么写入字节数最大为65535，可是我写入65535时，串口接收不到任何数据

double WRITE_BUFF;
u32 WRITE_BUFF_ZH;
u32 WRITE_BUFF_YU;
u8 TEXT_Buffer_ZH[8192];
u8 TEXT_Buffer_YU[8192];

double READ_BUFF;
u32 READ_BUFF_ZH;
double READ_BUFF_YU;
#define SIZE_ZH sizeof(TEXT_Buffer_ZH)
#define SIZE_YU sizeof(TEXT_Buffer_YU)
       

double P_BUFF[4000];

       
int main(void)
{       
        u8 key;
        u16 i=0;
         u16 j=0;
        u32 WriteAddr_ZH=0X000000;
         u32 WriteAddr_YU=0X080000;
        u32 ReadAddr=0X000000;
        u8 datatemp_ZH[8192];
        u8 datatemp_YU[8192];
         
        double t=0;         
        double        BMP_Pressure,BMP_Temperature;
         
        delay_init();                     //ÑÓʱº¯Êý³õʼ»¯          
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//ÉèÖÃÖжÏÓÅÏȼ¶·Ö×éΪ×é2£º2λÇÀÕ¼ÓÅÏȼ¶£¬2λÏìÓ¦ÓÅÏȼ¶
        uart_init(115200);                 //´®¿Ú³õʼ»¯Îª115200
        LED_Init();                                  //³õʼ»¯ÓëLEDÁ¬½ÓµÄÓ²¼þ½Ó¿Ú
        IIC_Init();
         W25QXX_Init();                        //W25QXX³õʼ»¯
        Bmp_Init();
//         printf("BMP280´óÆøѹÁ¦´«¸ÐÆ÷ʵÑé\r\n");
         delay_ms(50);
         
         
         while(1)
        {
               
                while(BMP280_GetStatus(BMP280_MEASURING) != RESET);
                while(BMP280_GetStatus(BMP280_IM_UPDATE) != RESET);
               
               
                BMP_Temperature = BMP280_Get_Temperature();
                BMP_Pressure= BMP280_Get_Pressure();       
               
                P_BUFF[j]=BMP_Pressure;
               
                WRITE_BUFF=P_BUFF[j];
                WRITE_BUFF_ZH=floor(WRITE_BUFF);
                WRITE_BUFF_YU=(WRITE_BUFF-floor(WRITE_BUFF))*1000000;
       
                TEXT_Buffer_ZH[i]=WRITE_BUFF_ZH/(256*256);
                TEXT_Buffer_ZH[i+1]=WRITE_BUFF_ZH/256;
                TEXT_Buffer_ZH[i+2]=WRITE_BUFF_ZH%(256*256);
               
                TEXT_Buffer_YU[i]=WRITE_BUFF_YU/(256*256);
                TEXT_Buffer_YU[i+1]=WRITE_BUFF_YU/256;
                TEXT_Buffer_YU[i+2]=WRITE_BUFF_YU%(256*256);

//                        READ_BUFF=TEXT_Buffer_ZH[i+0]*256*256+TEXT_Buffer_ZH[i+1]*256+TEXT_Buffer_ZH[i+2]+((double)((TEXT_Buffer_YU[i+0]*256*256+TEXT_Buffer_YU[i+1]*256+TEXT_Buffer_YU[i+2])))/1000000;
//               
                W25QXX_Write((u8*)TEXT_Buffer_ZH,WriteAddr_ZH,2100);                       
                W25QXX_Write((u8*)TEXT_Buffer_YU,WriteAddr_YU,2100);
                               
                W25QXX_Read(datatemp_ZH,WriteAddr_ZH,2100);
                W25QXX_Read(datatemp_YU,WriteAddr_YU,2100);
               
                WriteAddr_ZH=WriteAddr_ZH+0X000003;
                WriteAddr_YU=WriteAddr_YU+0X000003;
                READ_BUFF=datatemp_ZH[i]*256*256+datatemp_ZH[i+1]*256+datatemp_ZH[i+2]+((double)((datatemp_YU[i]*256*256+datatemp_YU[i+1]*256+datatemp_YU[i+2])))/1000000;
////                ReadAddr=ReadAddr+0X000006;
                i=i+3;
                printf("%f \r\n",READ_BUFF);
//                printf("%d \r\n",WriteAddr);
//                delay_ms(50);
                j++;
                LED0=!LED0;
        }
}